House Extension Cost 2022 - How Much Does It Cost? (2023)

How Much Does an Extension Cost?

Let's get straight to the point.

The average house extension cost is around £15,000 to £125,000.

Well hang on, that's quite a large price range but let us explain:

The cost of an extension will be dependent on the type of extension you choose to have, its size and the quality of finish.

For instance, a single-storey extension would cost around £15,000 to £100,000. This type of extension is normally used for small additions, such as a bathroom or adding more space to a kitchen or living room.

Now that's still a huge price range, so let's break it down a bit more.

A small single-storey extension (15m2) has an average price range of £15,000 up to £30,000 with the range mainly being affected by the quality of finish and your location.

Whilst a large single-storey extension (50m2) can cost anywhere from £50,000 up to £100,000.

You could also have a double extension. This features two floors and helps you to expand the space in both the downstairs and upstairs of your home. The cost of a double extension ranges from about £40,000 to £200,000.

As you can see, it's difficult to place a small price range on home extensions.

If you're looking to get a more accurate price for your house extension, we can help connect you with local builders.

Table of Contents

  • How Much Does an Extension Cost?
  • House Extension Prices
    • Single-Storey Extension Cost
    • Double-Storey Extension Cost
    • Rear Extension Cost
    • Side Extension Cost
    • Side-return Extension Cost
    • Kitchen Extension Cost
    • Bathroom Extension Cost
    • Porch Extension Cost
    • Prefab Extension Cost
    • Wrap-around Extension Cost
  • What are the Additional Costs of An Extension?
  • What are the Supply Costs of an Extension?
  • Tradesmen Costs for an Extension
  • How Long Does It Take to Build an Extension?
  • How Much Does Each Stage of an Extension Cost?
  • How Much Does an Extension Roof Cost?
  • Cost of Removing an Extension
  • FAQs
  • Sources

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House Extension Prices

Looking to understand the costs of adding an extension onto your home in more detail?

Let's break it down a little.

Single-Storey Extension Cost

A single-storey extension is a popular house extension and is normally used to enhance the space of a kitchen or living room on the first floor of a property.

The cost of single-storey extension installation is around £1400 to £2000.

The table below sets out the single-storey extension cost for different sizes of basic, average, and premium quality builds.

Size (m²) Basic Average Premium
Small (15m²) £21,000 £26,000 £30,000
Medium (25m²) £35,000 £43,000 £50,000
Large (50m²) £70,000 £85,000 £100,000

Double-Storey Extension Cost

A double-storey extension is built across two floors of a property, increasing the space available to your family by allowing you to add on multiple rooms.

The cost of an extension with two floors is between £1400 to £2000 per square metre.

House Extension Cost 2022 - How Much Does It Cost? (1)

The following table lays out the costs for different sizes and qualities of double-storey extensions.

Size (m²) Basic Average Premium
Small (30m²) £42,000 £51,000 £80,000
Medium (60m²) £84,000 £102,000 £120,000
Large (100m²) £140,000 £170,000 £200,000

Rear Extension Cost

A rear extension is installed at the back of a property where there is a large garden area.

The cost of a rear extension is around £1000 to £1600 per square metre.

The table below sets out the prices for different-sized basic, average, and premium rear extensions.

Size (m²) Basic Average Premium
Small (15m²) £15,000 £21,000 £24,000
Medium (25m²) £25,000 £35,000 £40,000
Large (50m²) £50,000 £70,000 £80,000

Side Extension Cost

Side extensions are a popular choice for properties with a lot of space on the left or right hand side of the home.

Typically, side extensions cost around £1000 to £2000 per m².

House Extension Cost 2022 - How Much Does It Cost? (2)

The following table shows the different-sized buildings for basic, average, and premium side extensions.

(Video) how much a house extension costs | based on 382 REAL projects | 2022 edition

Size (m²) Basic Average Premium
Small (20m²) £20,000 £30,000 £40,000
Medium (40m²) £40,000 £60,000 £80,000
Large (60m²) £60,000 £90,000 £120,000

Side-return Extension Cost

Properties with a small amount of space at the side of their home which is used to store bins, bikes, and more may benefit from a side return extension.

The price of a side-return extension per square metre is around £1500 to £2400.

The table below sets out the different costs of basic, average, and premium side-return extensions.

Size (m²) Basic Average Premium
Small (6m²) £9000 £12,000 £14,400
Medium (9m²) £13,500 £18,000 £21,600
Large (12m²) £18,000 £24,000 £28,800

Kitchen Extension Cost

Want to have a larger kitchen in your home?

Your best option might be to have a kitchen extension.

This would cost about the same as a single-storey extension, at around £1400 to £2000 per square metre plus £200 to £1000 per m² for the actual kitchen installation itself.

House Extension Cost 2022 - How Much Does It Cost? (3)

The table below sets out the costs for small, medium, and large kitchen extensions for various budgets.

Size (m²) Basic Average Premium
Small kitchen extension (6m²) £9,600 £13,800 £18,000
Medium kitchen extension (9m²) £14,400 £20,700 £27,000
Large kitchen extension (18m²) £28,800 £41,400 £54,000
Small kitchen suite (6m²) £1200 £3600 £6000
Medium-sized kitchen suite (9m²) £1800 £5400 £9000
Large kitchen suite (18m²) £3600 £11,800 £18,000

Bathroom Extension Cost

A bathroom extension is ideal if you only have one bathroom in your property, or you want to have a bigger bathroom.

The cost of house extension installation with a bathroom is based on single-storey extension prices. This means that it costs about £1400 to £2000 per m² along with the bathroom installation price which is around £500 to £1000 per square metre.

The following table outlines the costs of installing different-sized bathroom extensions with varying qualities.

Size (m²) Basic Average Premium
Small bathroom extension (3m²) £5700 £7400 £9000
Medium bathroom extension (6m²) £11,400 £14,700 £18,000
Large bathroom extension (9m²) £17,100 £22,100 £27,000
Small bathroom suite (3m²) £1500 £2300 £3000
Medium-sized bathroom suite (6m²) £3000 £4500 £6000
Large bathroom suite (9m²) £4500 £6800 £9000

Porch Extension Cost

A porch extension is a great way to enhance the entrance of your home.

On average, porch extensions cost around £500 to £800 per m².

House Extension Cost 2022 - How Much Does It Cost? (4)

The following table highlights the prices for uPVC, wood, aluminium, and brick porch extensions.

Size (m²) uPVC Wood Aluminium Brick
Small porch extension (3m²) £2400 £1500 £2300 £2300
Medium porch extension (6m²) £4800 £3000 £4500 £4500
Large porch extension (9m²) £7200 £4500 £6800 £6800

Prefab Extension Cost

On a tight budget?

If you don't have a huge budget, then a prefab extension may be your best option - as it will save on labour costs due to it being prefabricated before installation.

The average cost of a prefab extension is around £1200 to £1700 per square metre.

The below table sets out the costs for basic, average and premium prefab extensions.

Size (m²) Basic Average Premium
Small prefab extension (15m²) £18,000 £21,800 £25,500
Medium prefab extension (25m²) £30,000 £36,300 £42,500
Large prefab extension (35m²) £42,000 £50,800 £59,500

Wrap-around Extension Cost

A wrap-around extension is one of the largest extension types, which is normally attached to the rear and side of the home.

The average cost per square metre of a wrap-around extension is £2000 to £3000.

House Extension Cost 2022 - How Much Does It Cost? (5)

The table below shows the prices of different-sized wrap-around extensions on a basic, average, and premium budget.

Size (m²) Basic Average Premium
Small wrap-around extension (20m²) £40,000 £50,000 £60,000
Medium wrap-around extension (40m²) £80,000 £100,000 £120,000
Large wrap-around extension (60m²) £120,000 £150,000 £180,000

What are the Additional Costs of An Extension?

What other costs might you need to consider when building an extension?

Let's tackle that now.

Extension Architect Costs

You may want to consider hiring an architect to design and plan your new extension, while also making sure that it meets building regulations.

The cost to hire an architect is around £18 to £30 per hour.

Extensive Extension Groundwork Costs

Before building an extension, it is important that the ground is fully prepared.

This will ensure that the extension is installed on a robust foundation, while also preventing issues in the future.

If the existing ground is not level, then it may need to be excavated. This can cost around £30 to £50 per cubic metre.

(Video) How Much a House Extension Costs in the UK 2022

Another extensive type of groundwork is installing drainage. This may involve removing old pipes and installing new pipework and drains to ensure that your new extension has proper drainage.

The cost to install new drainage is around £700 to £1000.

Extension Planning Permission Costs

Before building an extension, it is important that your plans align with planning permission regulations. This will help you avoid paying around £200 for an application.

To avoid incurring extra costs, you'll need to make sure that your extension meets the following criteria:

  • The extension must not cover over half the property’s land.
  • It must not exceed the highest point of the roof on the existing property.
  • Extensions within two metres of the property’s edge should not have eaves that exceed a height of three metres.
  • The work must not include installing raised platforms, balconies, chimney flues, vent pipes or any work to the roof (including cladding).
  • Side extensions must be single-storey and cannot exceed four metres in height from the side elevation.
  • Extensions on the side of a property must not exceed more than half the width of the building.
  • Single-storey rear extensions must not extend more than four metres beyond the rear wall of a detached property or three metres for any other.
  • Double-storey extensions must not extend over four metres from the back wall of the property and must not be within seven metres of a property boundary.
  • The roof pitch of a double-storey extension must match the existing house as closely as possible.
  • All windows on the top floor of a double-storey extension must be obscure-glazed if located on a side elevation.

House Extension Cost 2022 - How Much Does It Cost? (6)

Extension Building Regulation Costs

The majority of house extensions do require building regulations approval before they can be constructed.

And what's this cost?

The cost of building regulations approval will vary depending on your local council, as all local authorities charge different amounts for building regulations approval.

There are various elements of an extension that must be signed off by a professional in order to deem the property safe.

This includes:

  • Internal and external walls

  • Some extensions require external walls to be built below ground level to ensure the superstructure (the extension) is supported properly.

    The new walls that are built will make up the substructure which normally includes blocks and mortar or brick. To ensure that the whole structure is protected, it is vital that the substructure is resistant to frost and substrates which are found in the ground.

  • Flooring

  • To ensure that the flooring installed in your extension meets building regulations, it is important that it has a sound structure to support a significant amount of weight.

    It should also be heat and moisture-resistant to insulate, ventilate, and protect the extension flooring from damp, weed growth, and contraction.

  • Ventilation

  • One of the most important elements you need to consider when installing a new extension is ventilation. This will improve the air quality in your home and promote better health.

    To ventilate your property, you could simply install windows - especially in rooms with poor ventilation such as a bathroom. You can also install trickle ventilation in all the rooms of your home by applying it to window frames.

  • Foundations

  • Before building an extension, it is important that there are robust foundations in place (which are normally made up of concrete).

    The soil used should be able to hold the weight of the foundations and extension structure. It should also be dug deep enough to ensure that movement and contraction does not affect the extension. This is especially important for a double-storey extension, as more soil and foundations are required to support a larger extension.

What are the Supply Costs of an Extension?

Planning a DIY extension? Or maybe you just want to buy the supplies yourself?

In this case, you'll need to consider the following supply costs:

Supply description Average supply cost
Skirting board £2 to £8 per m²
Plasterboard £3 to £16 per m²
Wood flooring £35 to £90 per m²
Laminate flooring £7 to £26 per m²
Wall tiles £9 to £45 per m²
Floor tiles £12 to £50 per m²
Paint £3 to £20 per litre
Plug sockets £2 to £120 per socket
Light switches £1 to £200 per switch
Radiators £14 to £400
Underfloor heating £60 to £100 per m²
Internal doors £70 to £500
External doors £35 to £900
Windows £100 to £320
Door handles £3 to £220
Light fittings £2 to £80 per light

Tradesmen Costs for an Extension

Here's another important thing.

When calculating the final cost of your house extension, you'll need to consider the labour costs charged by all the different tradespeople who will be working on your house extension.

Let's go through them now.

Extension Builder Cost

Builders have one of the most important jobs when constructing an extension.

They're involved in building the foundations and the actual structure of the extension to ensure it is robust and stable.

The average cost to hire a builder for your house extension is around £130 to £260 per day or £10 to £15 per hour.

Extension Plumber Cost

If building a kitchen or bathroom extension, you will need to hire a qualified plumber to install sinks, toilets, appliances, and more.

Plumbers cost around £200 to £400 per day for full bathroom installations or £30 to £60 an hour to plumb a sink.

Extension Electrician Cost

To get your extension fitted with lighting and electrical appliances, you will first need to hire a professional electrician to ensure everything is compliant and working properly.

The average hourly rate for an electrician is typically around £30 to £60 per hour or £170 to £340 a day.

Extension Plasterer Cost

To prepare your walls and ensure any paint or wallpaper lasts, you will need to hire an expert.

You should expect to pay £150 to £220 per day for a tradesman to plaster your new extension. They may only charge an hourly fee between £10 and £20 to re-plaster walls.

House Extension Cost 2022 - How Much Does It Cost? (7)

Extension Painter and Decorator Cost

Once the plastering is complete, you will need to bring in a decorator to paint or wallpaper the internal and external walls of your new house extension.

The average tradesperson will charge around £15 to £40 per hour to paint one or more walls.

For multiple rooms, you should expect to pay £100 to £300 a day.

(Video) How Much a UK House Extension Will Cost in 2023

Extension Carpenter Cost

If you're installing a new extension, you should hire a professional carpenter to help with the construction and installation of the new extension.

On average, a carpenter costs around £160 to £240 per day.

You may also want to hire them for smaller jobs - such as fitting a new door frame. In this case, they'll usually charge you an hourly rate of £20 to £40 an hour.

Extension Kitchen Fitter Cost

For a new kitchen extension, you should consider employing a kitchen fitter - who will install your kitchen cabinets and worktops.

For a small kitchen, you should expect to pay an hourly fee of £10 to £20, while a large kitchen may be subject to a day rate of between £120 to £200.

Extension Window Fitter Cost

Once your extension is built, you should hire a professional window fitter to install fully insulated windows.

For one or two windows, you should expect to pay around £8 to £20 an hour.

For a full set of windows on a double-storey extension, you'll likely be charged between £100 and £200 per day.

Extension Labourer Cost

Another important tradesperson you may need to hire is a labourer - who will assist with the majority of jobs onsite including building foundations, the extension structure, and more.


The average day rate for a labourer is £100 to £160 a day or £7 to £15 per hour.

Extension Bricklayer Cost

To ensure your extension is built properly, you will need to hire experienced bricklayers who know what they're doing.

Bricklayers tend to charge around £130 to £180 a day for a large extension or £12 to £20 per hour for a porch extension.

How Long Does It Take to Build an Extension?

Building an extension can be quite time-consuming.

Because of this, it's important that you understand the timeframes involved in building the type of extension you want.

Here's a quick break down:

Extension type Duration
Single-storey extension 2 to 3 months
Double-storey extension 4 to 6 months
Side extension 2 to 3 months
Side return extension 1 to 2 months
Rear extension 2 to 4 months
Wrap-around extension 4 to 6 months
Kitchen extension 2 to 6 months
Bathroom extension 2 to 4 months
Prefab extension 8 to 10 weeks
Porch extension 3 to 14 days

How Much Does Each Stage of an Extension Cost?

There are various stages involved in building an extension

Each of these stages has individual costs that you need to know about (and budget for).

Let's dive into them now.

Building Regulations & Design

So, what's first?

You'll need to start by ensuring that your extension design is compliant with current building regulation and planning permission rules.

But what if your current plans do not adhere to the conditions?

In that case, you will need to change your plans or pay around £200 or more to apply for your extension to be approved.

House Extension Cost 2022 - How Much Does It Cost? (8)

Once approval is obtained, then you can plan your extension in more detail.

For this, you'll need the help of an architect. Their main job is to draw up plans for the structure - which include the dimensions and the aesthetic of the extension, making sure the whole time that they adhere to the regulations.

Typically, an architect costs between £18 and £30 per hour.

Foundations and Groundworks

Before any building can begin, it is important that the ground is fully prepared.

This can be a costly process, as it involves excavation. This can cost from £30 to £50 per cubic metre, with the total cost being dependent on the size of the land you're working on.

You may also have to remove pipework and install new drainage. This will ensure that your extension is protected against flood and damage, while also ensuring water flow is running and connected to the main property (if it needs to be). This work tends to cost between £700 to £10,000.

Once all the groundwork is complete?

Only then can the foundations be set to provide a stable framework for the installation of the extension. Installing foundations is a time consuming component of the project, and will normally cost around £100 to £130 per cubic metre.

Building the Outer Shell

Once everything's prepped and the foundations are in place, what's next?

The next stage involves building the outer frames and walls - using timber, bricks, blocks, and tile materials.

The average price of an extension outer shell is around £800 to £900 per square metre for professionals to install a weatherproof extension shell.

Fixtures and Fittings

The last stage is all about the finishing touches.

(Video) How Much Does A House Extension Cost In 2022: Your UK Guide

This will include installing furniture (like kitchen cabinets and worktops) which will cost between £1000 and £7000.

For a bathroom extension, you should expect to pay around £1400 to £6000 for brand new bathroom fixtures.

At this stage, your windows and doors will also be installed. This costs around £400 to £600 per window, while door installation is typically priced at £40 to £90 per door.

You'll also want to fit indoor and outdoor light fixtures at this point, which normally amounts to £60 to £1000 if fitted by a professional electrician.

How Much Does an Extension Roof Cost?

One of the most important elements of a house extension is the roof.

But you have a few types of roofs that you can choose between.

Let's cover them now.

House Extension Cost 2022 - How Much Does It Cost? (9)

Duo-pitched Extension Roof Cost

A duo-pitch roof (or a gabled roof) is a simple roof design which features two slopes which meet at a ridge.

Duo-pitch extension roofs tend to cost around £3000 to £4500.

Flat Extension RoofCost

A flat roof is type of roof that is almost completely flat except for a slight slope which allows for drainage.

A flat extension roof typically costs around £1200 to £2000.

Catslide Extension Roof Cost

A catslide roof is a type of pitched roof which slopes downwards further on one side than the other.

The average cost of a catslide roof is around £1000 to £1500 per square metre.

Mono-pitch Extension Roof Cost

A mono-pitch roof or a lean-to roof is a single-sloped roof. This continues to be one of the most affordable roof solutions.

The installation price for a mono-pitch extension roof is normally between £2000 and £3200.

Hipped Extension Roof Cost

A hipped roof has four sloped sides which all have an equal length and meet at a central ridge.

The cost of a hipped extension roof is typically around £4000 to £4500.

Cost of Removing an Extension

What about if you want to remove an old extension? How much should that cost you?

To ensure the extension is removed properly, you should consider hiring professionals. This will cost around £500 to £3000.

On top of this, the cost of waste removal will be between £70 and £300.


Q: How close to my boundary can I build an extension?

A: If you're planning to build a double-storey extension, it should be no closer than seven metres from the boundary.

For any other type of extension that is within two metres of the boundary, it cannot exceed more than three metres of the existing property’s eaves.

Q: How much does an extension add to the value of a house?

A: Adding an extension onto your home can result in a return of investment up 23% for an additional bedroom and en-suite, while a bathroom extension can add up to 6% to the value of the property.

Q: What size extension can you build under permitted development?

A: If you want to save money on obtaining planning permission and building regulations approval, then you will need to build an extension that meets permitted development.

If you’re planning to build a single-storey rear extension, then this should not exceed a depth of 3 to 4 metres. Other extensions can extend to 6 metres, and detached properties can even extend their home up to 8 metres.

Q: How deep does footing need to be for a single storey extension?

A: Single storey extension foundations must be at least 200mm deep to ensure that the structure is completely secure and robust.

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House Extension Cost 2022 - How Much Does It Cost? (10)

Author: Heather B

I am a seasoned copywriter from Liverpool - who after graduating with a BA (Hons) degree in English Media and Cultural Studies - went on to specialise in the creation of business and lifestyle copy for a wide range of industries across the UK and USA.


How much does it cost to build a UK extension 2022? ›

In short, most extension projects cost around £1,350-£2,250/m² of new internal space. So a 30m² kitchen extension could be estimated at somewhere between £40,500-£67,500, plus, VAT at 20%.

How much should I pay for extension plans? ›

All of the guideline prices listed below are for construction only, updated as of 2022. They do not include VAT or professional fees. House extension costs: Single storey – A single storey extension in London will usually cost between £2,200 and £3,300 per sqm (£200 and £300 per square foot).

How much is a 2022 single story extension? ›

Single storey house extension cost

At £1,800 - £2,600 per m², we've roughly calculated the costs to be: A 20m² extension can cost £36,000 – £52,000. A 30m² extension ranges from £56,000 – £76,000. A 50m² extension could set you back between £90,000 – £130,000.

How much would a 20 square metre extension cost? ›

As a rule of thumb, building a home extension in London – just the shell – is going to cost you at least £2,000 per square metre. So, the cost of a 20 sqm extension would start from £40,000 (not including VAT).

How much can I extend my house without planning 2022? ›

Detached House Extension Rules 2022

Under permitted development for a detached house, you can extend up to 4m under permitted development, and up to 8m under the larger home extensions scheme / prior approval.

How do you calculate the cost of an extension? ›

Generally, initial extension building costs are calculated based on your property's size and are worked out by multiplying the square footage by labour rates.

How do you reduce extension costs? ›

30 Ways to Save Money on Your Home Extension Project
  1. 1) Plan the size of your extension carefully. ...
  2. 2) Types of extensions. ...
  3. 3) Designing your extension. ...
  4. 4) Fixed-price design extensions. ...
  5. 5) Get detailed drawings done. ...
  6. 6) Extension construction methods. ...
  7. 7) Put robust contacts into place. ...
  8. 8) Seek multiple contractor quotes.
10 Jun 2021

How much do plans cost for a small extension? ›

£1000-£1500/m2 is a fair estimate, but a lot depends on the type of construction – for example, the cost per metre of a stud wall would differ from that of a new bathroom.

How much should a 2 story extension cost? ›

Average cost of a 2 storey extension

In London the average cost excluding finishes is higher, with figures ranging from between £3,000 and £3,500 per square metre for the building cost. However, in London the added value of extra space is also far greater, with a minimum of £7,000 per sqm of increased value.

What is the rough cost of an extension? ›

Based on their experience, most answers were between £1,800-2,200 per m2. Please note that this doesn't include VAT, professional fees or a kitchen (which we will go into in more detail below).

What is the cheapest extension? ›

Single storey extensions are often the cheapest and most viable option, and could totally transform a small home, bringing in light, extra living space and opening up the house to the garden.

How do you decide if an extension is worth it? ›

If a home extension gives you the right amount of space in the right location and allows you to live your life as you choose, then we think it's definitely 'worth it'. Though the financial investment can be significant, the return on the investment is often greater still. “I love, love love, my house.”

How do I get enough money for an extension? ›

How to fund an extension
  1. Home improvement loan. A home improvement loan is one option for funding a house extension. ...
  2. Savings. If you have some cash to spare, then using this to pay for your house extension can make sense. ...
  3. Remortgage. ...
  4. Borrow more from your current lender. ...
  5. Credit card.

Can you pay monthly for house extension? ›

Yes, it is usually possible to borrow more against your home to finance your extension. This involves taking more money from your current mortgage lender to fund the renovation project, spreading the repayments over a long term. However, this isn't the only option and may not be right for you.

Why do extensions cost so much? ›

Why Do Some Hair Extensions Cost More Than Others? Usually, the quality of the hair (meaning how thick or thin or whether the hair is blended with synthetic fibers) determines the cost. However, it is also common to have poor quality hair in longer lengths just as expensive as shorter hair that is twice as thick.

Is it cheaper to build up or out 2022? ›

Building up is always the least expensive option for increasing your home's square-footage because it requires less material and labor. For example, if you have 1,000 sq. feet on the main level and want to add 1,000 sq. feet as a second floor, all you have to do is add more wood and framing labor.

Is it worth building a house 2022? ›

Yes 2022 can still be a good time to build your custom forever home, despite rising costs and interest rates. Building your custom home is an investment in your family's lifestyle and should be looked at as a long term financial & lifestyle decision of living in your forever home for 5 or more years.

Is it cheaper to build than buy 2022? ›

Is it cheaper to build or buy a house? As a rule of thumb, it's cheaper to buy a house than to build one. Building a new home costs $34,000 more, on average, than purchasing an existing home. The median cost of new construction was $449,000 in May 2022.

Does an extension add more value than cost? ›

Extensions are something that many property buyers look for to give them a brilliant new home. Because of this, you can expect higher, more frequent offers for your home should you decide to move! Your house extension could add as much as 15% more value to your property.

How much value does a house extension add? ›

Indeed, research from building society Nationwide estimated that, on average, extending a standard three-bedroom home with an extra bedroom and bathroom could increase the value of the property by an impressive 23%, whereas The Times suggests a more conservative overall boost of between 5-10% when extending your ...

How much money does an extension add? ›

Nationwide's research on the value of improvements to an average three bedroom house found that an extension creating a double bedroom and en-suite can add up to 23% to the value of your property.

What is the best extension to save money? ›

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3 Jan 2022

What type of extension adds most value? ›

Adding double bedrooms and bathrooms tend to add the most value. In order to get an accurate evaluation of how much value your extension could add, speak to local property experts and architects for their professional advice.

Is it cheaper to extend house up or out? ›

When it comes to budgeting for your home renovation, it's important to understand the range of costs involved in building up versus building out. Building out is significantly less expensive than building up. On average, it costs between $140 to $180 to expand your home's footprint outwards.

Is a small extension worth it? ›

Even if your budget is small, a well thought-through addition to your house can make a tiny dining area more usable, or create extra space for a home office. Extensions also can enhance natural light, link existing areas of the property, and improve the overall design, letting a space breathe a bit more.

How long does an extension take? ›

Depending on the size and scope of your extension, the length of time usually varies anywhere between 7 and 15 months (sometimes a lot longer). This is because building an extension involves a lot of different processes and professionals, plus a lot of unpredictable factors.

Is it worth extending your house? ›

Generally, extending your home will be a cost-effective investment that will pay back on itself when you eventually sell – but not always. The location and demand of your property will usually guarantee that your extension will add value to your home when it comes to selling.

How much can I extend my house without planning permission? ›

1. Under the relaxed rules, you can extend up to eight metres for detached houses and six metres for all other houses. Please note that for these larger extensions (beyond four and three metres respectively) you will need to give notification under the Neighbour Consultation Scheme.

Do you need an architect for an extension? ›

If you're looking for a cutting-edge contemporary extension that pushes the boundaries of eco-design and exploits the latest materials and thinking, then you should probably go straight to an architect. You still need to shop around though, because not all will specialise in the kind of extension you want.

How much does a single storey extension cost UK? ›

A basic extension will typically cost you around £2000 per square metre, meaning a 3x5 metre single storey extension would set you back around £30,000. Indeed, in 2022, the average cost of an extension is believed to be £37,500.

Can you live in a house during an extension? ›

It is possible to live on site throughout a house extension, but aside from all the dust and mess, you may end up slowing down progress as the builders attempt to work around your life.

How can I save money to build a house in 2022? ›

We've put together our top six ways to build your house, keep the costs low and save a ton of money in the process.
  1. Don't Use a Contractor. Don't get us wrong. ...
  2. Go Tiny. ...
  3. Use Reclaimed Building Material. ...
  4. Get as Much Done Cheaply or for Free. ...
  5. Keep the Design Simple. ...
  6. Skip the Fancy Finishes – For Now.
3 Sept 2022

How much does a 40 sq metre extension cost? ›

Sean from Cork: To build a 40m2 extension you would be looking around €86000 + vat. A lot depends on access to the house , and if it's straight forward e.g. no knocking smaller extension etc. Best tips would be to look at the builders previous work and get references from previous clients.

Can you lose money on an extension? ›

Potential buyers of your property may not value the extension as much as you do, and in financial terms you may end up disappointed.

How long is too long for an extension? ›

If you go longer than 8 weeks between extension maintenance you run the risk of developing tangling and matting above the extension attachment. Sometimes this tangling and matting can be brushed out during the removal process, sometimes it causes hair to break or tangles can become so severe they need to be cut out.

What home extension could result in the biggest uplift in property value? ›


You are guaranteed to add 20% or more to the house value if the additional bedroom is a master with an en-suite.

Will building materials go down in 2022 UK? ›

The shortage of materials such as timber, plaster and steel since the start of 2021 has led to major supply chain issues for those working on self build or renovation projects. But product availability has improved across most categories in 2022. However prices remain a rising problem.

How much does it cost to build a house 2022 UK? ›

Building costs in the UK start from £1,750 per square metre. And, In 2022, a cost estimation for a house is anywhere between £1,750 and £3,000 per m2.

Is it a good idea to build a house in 2022? ›

Yes 2022 can still be a good time to build your custom forever home, despite rising costs and interest rates. Building your custom home is an investment in your family's lifestyle and should be looked at as a long term financial & lifestyle decision of living in your forever home for 5 or more years.

What is the cheapest way to add a room to your house? ›

Finishing a basement, attic, or garage is one of the more inexpensive ways to add a room to your home as you won't need to add a foundation, roof, or structural elements.

What adds the most value to a home 2022? ›

Below are ten home improvement projects with the highest return on investment in 2022.
  • Landscaping. Curb appeal says a lot about your home. ...
  • Updated Kitchen Appliances. ...
  • New Front Door. ...
  • Windows. ...
  • Flooring. ...
  • Bathroom Remodel. ...
  • A Fresh Coat of Paint. ...
  • Garage Door Replacements.
10 Feb 2022

Is now a good time to build an extension? ›

Ideally, you should aim for the construction of your extension to commence in March or April, when there's little chance of the ground being too frozen to dig, or the air being too cold for brickwork.

How much has building materials increased 2022? ›

according to the seasonally adjusted figures. This followed a 1.0% decrease in March 2022, compared to March 2021. The month-on-month change shows a 1.7% decrease in April 2022. This followed a 1.8% decrease in March 2022, on the same basis.

Are building materials still high 2022? ›

This adds up to an 8% jump in building materials prices since the start of 2022. Building materials prices increased 20.4% year over year and have risen 33% since the start of the pandemic.

What is the best month to build a house in 2022? ›

Auspicious Days and Months for Building, Renovating and Buying A House in 2022. Based on Feng Shui, the best months in 2022 to start building or buying a house are August, September, and October and the best days are 3, 7, 11, 20, 24, 27, and 29.

Will construction costs fall in 2022? ›

Total construction new orders decreased 10.4% (£1,355 million) in Quarter 2 2022 compared with Quarter 1 (Jan to Mar) 2022; this is the largest quarterly fall in construction new orders since Quarter 4 (Oct to Dec) 2020 (11.7%).

When building a house what costs the most? ›

Framing is the highest material cost for most new home builds. High-quantity lumber framing averages $33,000 for a home in the U.S. This includes floors, walls and roof trusses. Metal stud framing systems start at about $20,000.

How much would it cost to build a 3 bedroom house from scratch UK? ›

Average cost of building a 3 bedroom house

The typical size of a three-bedroom home can range from around 90 square metres to 120 square metres, meaning the cost of building a three-bedroom house can range from around £126,000 to £300,000 with an average cost of around £213,000.

How long does it take to build a house UK 2022? ›

The actual build process usually takes around 9 to 12 months, if everything goes to plan and there are no major hiccups. That's not including the pre-build stage of buying land, designing and planning.


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