House Extension in city

Find House Extension Prices in city

Home > Extensions & Conversions Projects > House extensions > London

House Extension in city

House extension comes with a variety of advantages which makes it simple to see why the extension could be a great uptick in the possible cost of your residential or commercial property in terms of sales. So if you're wanting to build a brand-new house extension but still not convinced concerning the job, we're below to aid you. Being completely aware any type of residence building and construction job is typically a heavy financial investment, there's a huge requirement to be set on your decision prior to setting up the beginning of any kind of job. So are house extensions worth it? Below are a few of the leading benefits provided by house extensions to assist you choose if it's one of the most ideal course for you.

 

What's Associated with Adding an Extension?

The actions will vary relying on the range of your extension, but you can anticipate some, otherwise all, of the below to be involved when including an extension to your house:

 

  1. Getting Building Regulations or Planning Permission (if needed as the extension is larger than permitted development).
  2. Inspecting your leasehold arrangement (if appropriate) to see to it you can do what you intend to do.
  3. Hiring an architect  to draw the plans, considering your expected use ( kitchen area, washroom, research study).
  4. Hiring a competent builder with experience of larger projects.
  5. Contacting your insurance carrier to allow them recognize of the intended work ahead of it beginning.
  6. Getting car parking permits if needed for your specialists to ensure they have simple access to your building.
  7. Making certain all intended job drops within permitted allowables.
  8. Cleaning the space as well as excavating if necessary, including the removal of trees.
  9. Structure job can begin.

 

What is the cost of a house extension in city?

If you're taking into consideration including a two floor house extension, then establishing a budget for this job would be a excellent means to get going. Similar to a back extension, a 2 floor extension usually leaves the rest of the building requiring some job as well as, as a result of its dimension, this might imply the re-development of the whole house - which is why they can be very costly. Several of the other affecting aspects that can have large influence on a two storey house extension cost consists of: your area, the size of the develop, complexity of the layout (anything past the standard construct will generally need even more experience and also time), the glazing to be incorporated (the much more the glass made use of in the project, the more the product cost), along with the group made use of.

Average House extensions cost in London

The regular cost of House extensions are £62,143 in London. Costs vary based upon the materials and the company picked. The upper price range can be as high as £91,143. The material costs are in most cases around£10,500.

Average price per House extensions job in 2026

Avg. price low

Avg. price low
£34,572

Avg. price

Avg. price
£62,143

Avg. price high

Avg. price high
£91,143

£91700

£68775

£45850

£22925

£0

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

House extensions installation cost in London 2026

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

House extensions searches in September 2026

House extensions Projects in London in August 2026

262,017

Requests for quotations in London in August 2026

720

Requests for House extensions quotations in London in August 2026. -18% change from July 2026.

1,000

Requests for House extensions quotations in London County in August 2026. 14% change from July 2026.

Source: Numbers calculated based on the search volumes in major search engines

House extensions searches in cities and towns near London August 2026

720

Requests for quotations in London in August 2026

London

London is the capital city of England and it's still caught in the euphoria of the 2012 Olympic Games which appeared in the city. The multi-million pound project really helped to provide a range of new jobs across the city and saw a number of housing developments mainly in the Stratford region. London remains to be the most popular visitor city in Britain with sight-seeing opportunities such as Buckingham Palace, Big Ben, Madame Tussauds and also the Thames River. Homes are diverse as well, dating back to Tudor, Georgian and Victorians eras.

Looking for House extensions in London?

Get free quotes from local builders

Get free quotes

House extensions pros in London

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...

Latest review

Julian F., HP2
4

House Extensions in Hemel Hempstead

No quote received

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...

Latest review

Patricia Z., SE21
5

House Extensions in London

Great consultation by Catalin Spent a lot of time with us understanding the project and various options.

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.

Latest review

Vikram D., NW7
4

House Extensions in Mill Hill

Very straight and helpful. Provided useful advice and suggestions.

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.

Latest review

Jagdish K., HA3
5

House Extensions in Harrow

Absolutely pleasant appointment. Very patient and polite, listened carefully to detail and more of my background and his...

Tectra Partnership Ltd

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

Latest review

Deepak S., KT10
5

House Extensions in Esher

excellent communication

LW Building Service

2 review(s)
Based: in London, SE20 8AG

Latest review

Rosa S., SE20
3

House Extensions in London

I have not yet finalised quotation

JPA Building Construction LTD

1 review(s)
Based: in Twickenham , TW1 1AG

Latest review

Rosa S., SE20
5

House Extensions in London

Very nice and helpful unfortunately I am looking for a builder who lives nearby my property

Similar Customer Enquiries for House extensions in London

14 Aug

House Extensions

London - N21

Enquiry from: Saeed Y

Start Date: Immediate

loft conversion side and rear extension

Post a similar request >

26 Apr

House Extensions

London - E7

Enquiry from: Mujibur O

Start Date: Less than one month

customer requested quotes for house extension from a builder around london. they are considering a couple of projects at the moment.call anytime to arrange appointment to discuss. the information belo...

Post a similar request >

27 Mar

House Extensions

London - SE19

Enquiry from: Natasha D

Start Date: Immediate

Customer in London area made an enquiry for House Extension online. Confirmed via SMS at 12:58 Please call to arrange an appointment to discuss options

Post a similar request >

24 Oct

House Extensions

London - E4

Enquiry from: Elaine R

Start Date: Immediate

Customer made an online enquiry for House Extension via one of our websites. Confirmed via . Please call to arrange an appointment to quote.

Post a similar request >

16 Oct

House Extensions

London - SW6

Enquiry from: Victor I

Start Date: Immediate

Customer made enquiry for House Extension quotes online. Confirmed interest via phone at 20:30 Homeowner lives in London area. Please call to arrange appointment

Post a similar request >

13 Oct

House Extensions

London - N14

Enquiry from: Rómulo V

Start Date: Immediate

Customer made an online enquiry for House Extension via one of our websites. Confirmed via . Please call to arrange an appointment to quote.

Post a similar request >

06 Oct

House Extensions

London - NW9

Enquiry from: Ekrem M

Start Date: Immediate

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

Post a similar request >

29 Sep

House Extensions

London - SE26

Enquiry from: Jennifer K

Start Date: Immediate

Customer in London area made an enquiry for House Extension online. Please call to arrange an appointment to discuss options

Post a similar request >

29 Sep

House Extensions

London - SE13

Enquiry from: Helen M

Start Date: Immediate

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

Post a similar request >

18 Aug

House Extensions

London - N22

Enquiry from: Derek A

Start Date: Immediate

kitchen and bathroom extension

Post a similar request >

03 Jul

House Extensions

London - N11

Enquiry from: Navin H

Start Date: Immediate

ground floor extension to an end terrace house 6m wide by 5m deep with a pitch roof and 2 sky panels

Post a similar request >

06 May

House Extensions

London - NW6

Enquiry from: Noam G

Start Date: Immediate

hi, i'm in the process of buying a house, which needs a fair bit of work. this would include converting an attached garage into a bedroom, knocking down a couple of walls, doing a small extension int...

Post a similar request >

22 Apr

House Extensions

London - E17

Enquiry from: Laura J

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 >

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 >

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 >

02 Mar

House Extensions

London - SE9

Enquiry from: Amir A

Start Date: Immediate

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

Post a similar request >

22 Feb

House Extensions

London - SE25

Enquiry from: Zack K

Start Date: 1 to 3 months

sip construction for wraparound kitchen extension project with planning permission granted and structural & building regulations drawings available/in place. customer is currently in the process of l...

Post a similar request >

18 Feb

House Extensions

London - E4

Enquiry from: Mia G

Start Date: Immediate

Would like to get a cost estimate for loft and rear extension for a house that we are looking to purchase on Old Church Road, Chingford.

Post a similar request >

09 Jan

House Extensions

London - NW2

Enquiry from: Naciye H

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 >

21 Oct

House Extensions

London - SE26

Enquiry from: Ga R

Start Date: Immediate

Customer made an online enquiry for House Extension via one of our websites. Confirmed via . Please call to arrange an appointment to quote.

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 London

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

Hire with confidence

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

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 Local Quotes it's a big part of my …

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

FAQs

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.

how long do house extensions take?

If you’re about to start your house extension project and wondering how long it’ll take to complete, you’re not alone! This is one of the most common questions that’s asked by homeowners in the UK and across the globe. However, there’s no single precise answer for this as there are multiple factors that’ll affect the length of time it’ll take to complete your home extension. These factors include the size of the construction work as well as whether you’re planning to live in the house after completion or otherwise.

For a single extension, the length of time it’ll take to complete the home extension is normally up to 3 months. So let’s break this down:

As you would have expected, the first step to be taken is the preparation of the site. You start by digging out the footing and preparing the foundation which should take about 2 weeks. This is then followed by the damp course installation as well as the fitting of any drains needed around the extension which will also take a further 2 weeks.

The 5th week will be for the construction of the external walls as well as putting the blockwork in place for the provision of the cavity wall insulation. A further 2 weeks after this, will be dedicated to the installation of the roof structure and the internal walls.

It’s at this junction that you’ll call on your weather proof installer to fit in your uPVC windows and doors. Once done, the gas fitters and electricians will have to be on site to connect power to your new extension building. Subsequently, this will be followed by internal wall plastering as well as breaking through your main house. Once the plaster is dried, decorations completed and all the required furniture and units installed, the extension is ready for use.

how much is a double house extension?

A double house extension is basically a construction to any aspect of your house that elevates up to offer two floors of space. It can be structured to suit your existing home in two storeys or as a side wing on a taller property. If you’re considering building a double house extension, then estimating the cost is a very important task to do before commencing the project. In this article, we’ll give you an idea of the cost of a double house extension so you can estimate yours accordingly.

The double house extension cost depends on several factors that’s specific to your home as well as your design choice. These includes:

• Location of your property. Places like London and the southeast will generally cost more than the other regions due to higher demands.

• Accessibility of the site. The ease of your site’s accessibility also plays a key role in the price.

• Size of the extension. The more the extension’s size in footprint and square metres, the higher the possible costs.

• Materials used in making the roof as well as the complexity of the roof design.

• Your choice of finishing. These includes flooring window and door frames, glazing, underfloor heating and roof lights.

• Your property’s soil type. Different types of soil requires varying treatments as well as materials to develop solid foundations.

Constructing a double house extension is a quite simple build in terms of technicality when its to the side or rear of your house as this can also help you save some money. Generally, considerably expanding your home’s space by building a double house extension will cost within the range of £1,500 per m2 to about £2,800 per m2.

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.

House extensions

Other Top Projects in London

Customer Reviews

Overall rating:


London House extensions installers are rated 4.4 out of 5 based on 22 reviews of 183 pros.
The LeadsDoWork rating and review is an overall rating based on verified reviews and feedback from the customers with House extensions projects that have been connected with House extensions pros to help them. All House extensions contractors All London House extensions contractors

Are you a builder in London?

We can help you get more house extensions work with our qualified job leads and boost your business.

Join today