House extensions Costs

Compare House Extension Prices Near You

Home > Extensions & Conversions Projects > House extensions

Average House extensions cost

The regular cost of House extensions are £55,929 in your area. Costs vary based upon the materials and the company picked. The upper price range can be as high as £82,929. The material costs are in most cases around£10,500.

Average price per House extensions job in 2025

Avg. price low

Avg. price low
£30,358

Avg. price

Avg. price
£55,929

Avg. price high

Avg. price high
£82,929

£83500

£62625

£41750

£20875

£0

Prices based on actual House extensions costs for your area, as reported by local LeadsDoWork members.

House extensions installation cost in your area 2025

Labour cost £27,000
Material cost £10,500
Waste removal £2,500
Time frame: 10-14 weeks

Advantages for House extensions

  • Create additional usable space within in your home
  • Create more room upstairs, additional bathroom or bedrooms
  • Increases the value of your home
  • As your family grows it means you can stay in the same home for longer

Disadvantages for House extensions

  • Will cause a lot of disruption when the existing house wall is opened up into the extension
  • Upstairs windows should be carefully planned not to look into neighbours homes

House extensions Manufacturers

House extensions FAQs

Are house extensions worth it?

Often referred to by many as the holy grail of home improvements, house extension comes with a wide range of benefits which makes it easy to see why the extension could be a great uptick in the potential price of your property in terms of sales. So if you’re looking to build a new home extension but still not convinced about the project, we’re here to help you. Being fully aware any home construction work is usually a heavy investment, there’s a huge need to be set on your decision before scheduling the commencement of any work. So are house extensions worth it? Below are some of the top benefits offered by house extensions to help you decide if it’s the most suitable route for you.

• Add To Your Home’s Value

Building an home extension is a great way to add value to your home before selling. Increasing the living space of your home is an incredible appeal to many buyers which significantly increases your property’s total value. However, you must ensure that the extension is impressively designed using top quality materials in order to generate more value.

• Good Alternative To House Moving

The most common reason for moving is usually due to a lack of sufficient space, but with house prices steadily on the increase a cost effective alternative is highly sought after. This alternative is house extension which creates more space for the household to spread out and have more privacy.

• You May Not Require A Planning Permission

You can extend your house and still not need to apply for a planning permission. To achieve this, simply comply with the laid down rules set under the permitted development rights.

• Extra Living Space

If you fill you’re starting to outgrow your existing structure and do not buy into the idea of moving, then your best bet might just be to extend your home.

Will my extension be expensive?

It depends on the size and type of extension. Small porches or flat roof extensions are very reasonably priced. More substantial two storey extensions can be expensive. In general, the price is roughly proportional to the amount of space you add to your home.

Can an extension add value to my home?

Yes. Most extensions will add substantial value to your home, and you may find that the extension adds more value than it cost. However, it’s important to be sure that the home remains balanced. Extending your garage and leaving your property with no parking spaces, for example, may impact your ability to sell.

When do you need planning permission for a house extension?

If you’re planning on adding a house extension to your property, you’d probably be worried about whether or not your proposed extension would require a planing permission. Well, it may be relieving to know that not every house extension project would require a formal consent, and in fact, several extensions are covered by the permitted development rights. Not only can this save you a considerable amount of time especially at the project’s planning phase, but it’ll also save you money on the application fee. In the UK, single storey extensions to the house’s rear can be 3 metres deep for both semi detached houses and terraces or 8 metres deep for detached homes.

So how do you know when you’d require a planning permission for your home extension? Well, if your extension plan fits these criteria explained below, then your project is most likely going to be allowable as a permitted development.

• Extensions, which includes previous additions, must not go beyond half of the original house’s total surrounding land area.

• The main elevation, or side elevation where it fronts the highway, must not be extended forward.

• For single storeys, the rear additions must not extend more than the original house’s rear by more than 3 metres in both semi attached homes and terraces (4 metres for detached houses).

• Extensions to the side must be a single storey with a height not exceeding 4 metres and not going beyond 50% of the original house’s width.

• Extensions hat within 2 metres of a boundary should have a eaves height not more than 3 metres.

• Multi storey addition must not extend beyond the original house’s rear wall by a maximum of 3 metres or 7 metres of the boundary opposite the rear wall.

• Permitted development rights do not apply in listed buildings or designated areas.

Can I extend the front of my house?

When it comes to extending a home, the rear of the house often comes to mind a lot more than the front. However, this doesn’t mean that you can’t extend the front of your house. This can be done either as part of a renovation project whereby the entire house is incorporated or it can also be done in isolation. It’s possible to extend the front of your house without the need to apply for a planning permission, however, there are a bunch of limitations you’d have to comply with if you wish to carry out with such a project. Sometimes, this may imply that extending to the front of your home is more tedious and tasking than extending your home’s rear. So exactly how far can you extend the front of your home without planning permission?

 

The short and simple answer to this question is 2 metres square area with a height not more than 3 metres. Generally, you do not need a planning permission to build a front porch as long as its area doesn’t go beyond 2 square metres from a public road or walkway. Also, a tiled or slated roof can be as much as 4 metres but other roofs must not go beyond 3 metres in height. If you want to extend the front of your home beyond the restrictions specified, then you’ll have to apply for a planning permission.

 

Extending the front of home can be quite costly, but this can be controlled by not building to the extension to the highest specification, not including an extension on kitchens or bathrooms and more.

Should I use concrete or timber footings?

For 2 metre solid fences it’s recommended to use concrete posts to support each panel. For smaller 1 metre fences or for picket fences with gaps between each timber piece you can use timber posts. A fencing contractor will be able to advise you on the best materials from the length and requirements of a new fence.

How much value does an extension add to your house?

Are you interested in extending your home to create more living space? If yes, then you’d probably want to know how much value it can add to your property in order to compare the building costs to the potential value gain. Well, as long as you know what you’re doing, your house doesn’t necessarily have to be a money pit. So what are your options when talking about home extensions and what’s the associated value to be gained?

• Bathroom Extensions

Although you should have it in mind that bathroom extensions isn’t usually that cheap, but once done, it can increase the value of a standard UK house within the range of £12,000 to £15,000. Meanwhile the finishing cost of a bathroom can range from £2,500 to £7,000.

• Single or Double Storey Extensions

Single storey extensions are always huge when it comes to increasing the value of your home - giving about 4 to 7 percent increase. If it goes that far, then literally nothing beats a full spectrum, double storey extension which can give up to 11 percent increase in the value of a property - equalling about a whooping £33,000 for a standard home in the UK.

• Conservatory Extension

With conservatories becoming more and more popular in the UK due to the weather conditions, several buyers are now including it’s availability as part of the criteria for purchasing a house. Wonder why? This is simply because everyone wants to enjoy their garden all throughout the year. As a result of this high demand, adding this type of extension to your house can go a long way to increase it’s value. However, it’s very important to incorporate high quality materials during construction. With glass conservatories offering, on the average, up to £5,000 increase in value, the cheaper PVC alternative offers much less value and can also deter potential buyers.

What types of extension are there?

There are many different types of extension. For example, you could install an orangery, flat or pitched roof extension, over-structure extension, single or double storey extension or a glass box extension. Which one of these is most suitable will depend on your existing property.

Our reviews

Average

Would highly recommend

Would highly recommend, they found me a firm which I was happy with a quote they give me and went ahead and had my job done within 2 days of enquiring.

Good easy way to find a selection of…

Good easy way to find a selection of trades you need all in one place.

Love LeadsDoWork it's a big part of my …

Love LeadsDoWork it's a big part of my Business I would recommend to anyone

Dream the Build

Based: in London, EC1V

DREAM the Build. Ltd ' Constructing your Vision

Making home development exciting, fun and asse...

Latest review

Jagdish K., HA3
4th October 2016

House Extensions in Harrow

In dept details for quotation great approach. Great advice Still going through the qu...

Jassi Builders

Based: in Hayes, UB4

Hi Jassi Builders LTD here, I am a specialist in planning, designing and building control services. ...

Latest review

Julian F., HP2
25th February 2022

House Extensions in Hemel Hempstead

No quote received

B&G Carpentry

Based: in Newhaven, BN9

B&G Carpentry is based in Newhaven and have 5 positive reviews

Latest review

Laurie S., BN12
24th February 2020

House Extensions in Worthing

Hi Bob, I'm very pleased with my new porch. Having phoned me immediately when I cont...

Castell Home Improvements

Based: in Walton-on-thames, KT12

Castell Home Improvements is based in Walton-on-thames and have 2 positive reviews

Latest review

Pravin S., SM5
25th January 2018

House Extensions in Carshalton

Not had any discussion one Cost so far

OJS Building

Based: in Surrey, KT17

OJS Building are a local building firm based in Epsom and offering services to domestic and commerci...

Latest review

Abby E., BN7
14th July 2017

House Extensions in Lewes

Quick home visit and quote

Omega Lifestyle

Based: in Peterborough, PE7

Omega Lifestyle prides itself on providing a high quality of customer service from the initial order...

Latest review

J D., PE32
17th October 2016

House Extensions in King's Lynn

I was so pleased to finally meet a tradesman who actually provided a quote and so qui...

MTL Contractors

Based: in Southampton, SO14

MTL Contractors is based in Southampton and have 2 positive reviews

Latest review

David M., SP10
14th December 2016

House Extensions in Andover

Awaiting quote but service so far has been very good.

Nicholas James Construction

Based: in Bromley, BR1

From past fifteen years we have been established as the finest building and construction service pro...

Latest review

Jagdish K., HA3
4th October 2016

House Extensions in Harrow

Absolutely pleasant appointment. Very patient and polite, listened carefully to detai...

Scotbuild Group

Based: in Fife, KY14

Scotbuild Group is based in Fife and have 7 positive reviews

Latest review

Lesley D., DD4
3rd October 2016

House Extensions in Dundee

I cannot comment on prices as we are not yet at that stage

Options Home Improvements

Based: in Kent, ME8

Here at Options Home Improvements we specialize is the bespoke design & installation of PVCu & Alumi...

Latest review

Lisa V., ME1
7th August 2016

House Extensions in Rochester

I haven't had the extension built yet but am planning to use them

Rated Local builders

Jassi Builders LTD

2 review(s)
Based: in Hayes, UB4 9YD

Hi Jassi Builders LTD here, I am a specialist in planning, designing and building control services. I make sure that I have completed all my work on perfect time and leave customers in complete satisfaction. We do all types of loft conversions, exten...

Dream the Build

19 review(s)
Based: in London, EC1V 2NX

DREAM the Build. Ltd ' Constructing your Vision Making home development exciting, fun and asset building experience , future proofing household & investors Who we are ? Starting fresh in a new country is never easy, but what we did Catal...

Options Home Improvements LTD

1 review(s)
Based: in Kent, ME8 0DB

Here at Options Home Improvements we specialize is the bespoke design & installation of PVCu & Aluminium, windows and doors, orangeries & conservatories in Gillingham, Kent & South East area. Options Home Improvements was started due to the seemi...

Blue SKY Developers Limited

1 review(s)
Based: in London, NW3 6DX

Blue Sky Developers is a registered company in the UK that specialises in all building services you could require. We are based in North London but carry work out all around London.

Scotbuild Group LTD

7 review(s)
Based: in Fife, KY14 7AU

Scotbuild Group LTD based in Fife, offer services in Extensions & Conversions. They have an average rating of 4.5471428571429 from 7 review(s). See their latest 5 star review below

Build Junky

3 review(s)
Based: in Doncaster, DN9 1AL

We are a high quality building company based on the outskirts of Doncaster. With an aim to produce consistent workmanship of the highest standard alongside giving our customers the very best service available. Alongside carrying ou...

CMK Home Extensions LTD

2 review(s)
Based: in Glasgow, G61 3NU

The alternative to traditional domestic builders CMK Home Extensions bring a modern, professional approach to all your home improvement and extension needs. Whether its a new open plan living space, kitchen diner, family room or sun room we can trans...

Nicholas James Construction

7 review(s)
Based: in Bromley, BR1 3AX

From past fifteen years we have been established as the finest building and construction service provider to clients in Bromley and its surrounding areas.

Magnus Technical Engineering LTD

6 review(s)
Based: in Appley bridge, WN6 9DB

Magnus Technical Engineering LTD based in Appley bridge, offer services in Extensions & Conversions. They have an average rating of 4.9583333333333 from 6 review(s). See their latest 5 star review below

Tectra Partnership Ltd

1 review(s)
Based: in Slough, SL3 0JE

Tectra Partnership Ltd based in Slough, offer services in Extensions & Conversions. They have an average rating of 4.75 from 1 review(s). See their latest 5 star review below

Similar Customer Enquiries for House extensions

16 Apr

House Extensions

Guildford - GU2

Enquiry from: Clarice B

Start Date: Immediate

Customer made enquiry for House Extension quotes online. Homeowner lives in Guildford area. Please call to arrange appointment

Post a similar request >

16 Apr

House Extensions

Bath - BA1

Enquiry from: David S

Start Date: Immediate

ground floor extension kitchen diner

Post a similar request >

15 Apr

House Extensions

London - SW19

Enquiry from: Intisar C

Start Date: Immediate

customer in london areas is looking to do a couple of projects at the moment, and would like quotes for house extension.confirmed interest via sms and email at 15/04/2025 17:16.please call to arrange ...

Post a similar request >

14 Apr

House Extensions

Doune - FK16

Enquiry from: Laura C

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Two storey extension,Multiple extensions When was the property built? 1921 to 1979 What is the street / road Name? 7 ...

Post a similar request >

14 Apr

House Extensions

Faversham - ME13

Enquiry from: Olivia S

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Single storey extension When was the property built? 1921 to 1979 How many stories is the current building? 2 Storeys D...

Post a similar request >

14 Apr

House Extensions

Blakeney, Lydney - GL15

Enquiry from: Michelle W

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Single storey extension When was the property built? 1921 to 1979 How many stories is the current building? 2 Storeys D...

Post a similar request >

11 Apr

House Extensions

Feltham - TW13

Enquiry from: Nijat M

Start Date: Immediate

Customer is looking for House Extension quotes. They are unsure of options so would like to discuss. Confirmed interest via Customer lives in Feltham area Please call to arrange an appointment

Post a similar request >

10 Apr

House Extensions

York - YO23

Enquiry from: Faye S

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Single storey extension When was the property built? Pre 1920 How many stories is the current building? 2 Storeys Do yo...

Post a similar request >

09 Apr

House Extensions

London - SW16

Enquiry from: Andrea C

Start Date: Immediate

Customer is looking for House Extension quotes. They are unsure of options so would like to discuss. Confirmed interest via SMS/ Customer lives in London area Please call to arrange an appointment

Post a similar request >

08 Apr

House Extensions

Liverpool - L14

Enquiry from: Tom J

Start Date: Immediate

Customer is looking for quotes for House Extension from pros around Liverpool. Please call to arrange appointment to discuss

Post a similar request >

07 Apr

House Extensions

Glasgow - G71

Enquiry from: Elaine M

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Single storey extension When was the property built? 1921 to 1979 How many stories is the current building? 2 Storeys ...

Post a similar request >

01 Apr

House Extensions

Preston - PR4

Enquiry from: Alex N

Start Date: Immediate

Single-storey pitched roof extension to the rear of a detached property. Plans already drawn up for building regs. Looking to start in the next 2 months really.

Post a similar request >

01 Apr

House Extensions

Addlestone - KT15

Enquiry from: Dian D

Start Date: Immediate

What type of property is this for? House What type of extension do you need? House extension / would like advice from builder When was the property built? 1980 or later How many stories is the curr...

Post a similar request >

30 Mar

House Extensions

Coventry - CV6

Enquiry from: Manoj M

Start Date: Immediate

customer made an enquiry for house extension and confirmed on the local quotes site they would like quotes from a builder.customer lives in the coventry area and would like a call to discuss options.s...

Post a similar request >

28 Mar

House Extensions

Bristol - BS16

Enquiry from: Karen L

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Single storey extension When was the property built? 1980 or later How many stories is the current building? 2 Storeys...

Post a similar request >

26 Mar

House Extensions

Banbury - OX15

Enquiry from: Peter W

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Single storey extension When was the property built? 1921 to 1979 How many stories is the current building? 2 Storeys D...

Post a similar request >

25 Mar

House Extensions

Northampton - NN2

Enquiry from: Hema V

Start Date: Immediate

Customer made an enquiry for House Extension via one of our websites. Looking at various options they would like to discuss directly Confirmed interest Please call to discuss and arrange appointment t...

Post a similar request >

24 Mar

House Extensions

Lincoln - LN6

Enquiry from: Olufunmilayo A

Start Date: Immediate

customer in lincoln areas is looking to do a couple of projects at the moment, and would like quotes for house extension.confirmed interest via sms and email at 24/03/2025 08:12.please call to arrange...

Post a similar request >

22 Mar

House Extensions

Arundel - BN18

Enquiry from: Samuel C

Start Date: Immediate

what type of property is this for? house what type of extension do you need? two storey extension when was the property built? 1921 to 1979 how many stories is the current building? 2 storeys do you h...

Post a similar request >

21 Mar

House Extensions

Tetbury - GL8

Enquiry from: Ollie R

Start Date: Immediate

What type of property is this for? House What type of extension do you need? Multiple extensions When was the property built? 1980 or later How many stories is the current building? 2 Storeys Do y...

Post a similar request >

Local & reliable builders near me

Tell us about your house extensions project

Answer a few quick questions, so we can match you with local builders who can help.

Find up to 4 builders in your area

Get free, no-obligation local house extensions quotes from 4 verified builders working in your area.

Hire with confidence

Compare customer reviews, services and prices, and choose the right tradesperson for you.