House Extension in city

Find House Extension Prices in city

Home > Extensions & Conversions Projects > House extensions > Westminster

House Extension in city

House extension comes with a vast array of benefits that makes it easy to see why the extension could be a fantastic uptick in the prospective price of your residential property in regards to sales. So if you're aiming to construct a brand-new house extension but still not encouraged regarding the job, we're here to assist you. Being totally aware any type of house building and construction job is typically a hefty investment, there's a significant demand to be set on your decision before arranging the commencement of any work. So are house extensions worth it? Below are a few of the leading benefits provided by house extensions to aid you make a decision if it's one of the most suitable course for you.

 

What's Associated with Including an Extension?

The actions will differ depending upon the range of your extension, however you can expect some, if not all, of the below to be entailed when including an expansion to your residence:

 

  1. Acquiring Building Regulations or Planning Permission (if needed as the extension is larger than permitted development).
  2. Inspecting your leasehold contract (if relevant) to ensure you can do what you want to do.
  3. Enlisting an architect  to prepare the plans, considering your planned usage ( cooking area, restroom, office).
  4. Hiring a competent builder with experience of larger projects.
  5. Calling your insurance coverage provider to let them know of the prepared work ahead of it starting.
  6. Obtaining parking allows if needed for your contractors to guarantee they have easy accessibility to your residential property.
  7. Making sure all planned work falls within allowed allowables.
  8. Clearing up the area as well as digging deep into if required, including the elimination of trees.
  9. Structure job can start.

 

What is the price of a house extension in city?

If you're considering including a 2 floor house extension, after that establishing a allocate this task would certainly be a fantastic way to start. Similar to a back extension, a 2 floor extension generally leaves the rest of the structure needing some work as well as, as a result of its dimension, this may indicate the re-development of the entire house - which is why they can be really pricey. Several of the various other influencing factors that can have large effect on a two floor house extension price includes: your place, the dimension of the construct, intricacy of the design (anything beyond the conventional construct will normally require even more experience as well as time), the glazing to be integrated (the much more the glass utilized in the job, the much more the material price), along with the team used.

Average House extensions cost in Westminster

The regular cost of House extensions are £62,143 in Westminster. 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 Westminster, as reported by local LeadsDoWork members.

House extensions installation cost in Westminster 2026

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

House extensions on Google in Westminster

Google searches that showed Local Quotes, 17 July to 14 October 2026

468

Searches that showed one of our pages for Westminster, all services

Source: Google Search Console, the number of times our pages appeared in Google search results. It counts searches that showed the page, not quote requests.

House extensions searches near Westminster, 17 July to 14 October 2026

7

Searches that showed our page for Ealing

Westminster

The city of Westminster has got one of the highest populace densities in the UK, spanning lots of Central London. Contained in its boundaries are a few of London's finest tourist attractions, including Buckingham Palace, the London Eye, Downing Street and the Houses of Parliament.

Westminster was only officially developed in 1965, nonetheless its history stretches back to the Norman Conquest, with a lot of Victorian and Georgian buildings still making up large areas of the city.

Looking for House extensions in Westminster?

Get free quotes from local builders

Get free quotes

House extensions pros in Westminster

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 Extension in London

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

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 Extension in Hemel Hempstead

No quote received

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 Extension 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 Extension 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 Extension in Esher

excellent communication

LW Building Service

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

Latest review

Rosa S., SE20
3

House Extension 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 Extension 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 and around Westminster

14 Aug

House extensions

London - N21

Enquiry from: Saeed Y

Start Date: Immediate

Loft conversion side and rear extension

Post a similar request >

16 Jul

House extensions

Southall - UB1

Enquiry from: Lisa A

Start Date: Immediate

I need a extension planing, design and build

Post a similar request >

26 Apr

House extensions

London - E7

Enquiry from: Mujibur O

Start Date: Less than one month

They are considering a couple of projects at the moment

Property: terrace

Post a similar request >

27 Mar

House extensions

London - SE19

Enquiry from: Natasha D

Start Date: Immediate

House extensions enquiry

Post a similar request >

01 Nov

House extensions

Enfield - EN1

Enquiry from: Sarah F

Start Date: Immediate

House extensions enquiry

Post a similar request >

31 Oct

House extensions

Feltham - TW13

Enquiry from: Lubna S

Start Date: Immediate

House extensions enquiry

Post a similar request >

26 Oct

House extensions

Harrow - HA3

Enquiry from: Divyaba R

Start Date: Immediate

House extensions enquiry

Post a similar request >

24 Oct

House extensions

Edgware - HA8

Enquiry from: Naran V

Start Date: Immediate

House extensions enquiry

Post a similar request >

24 Oct

House extensions

London - E4

Enquiry from: Elaine R

Start Date: Immediate

House extensions enquiry

Post a similar request >

22 Oct

House extensions

Romford - RM7

Enquiry from: Suhailah M

Start Date: Immediate

House extensions Lead

Property: terrace · When: immediate

Post a similar request >

20 Oct

House extensions

Dagenham - RM8

Enquiry from: Merra T

Start Date: Immediate

House extensions enquiry

Post a similar request >

16 Oct

House extensions

London - SW6

Enquiry from: Victor I

Start Date: Immediate

House extensions enquiry

Post a similar request >

13 Oct

House extensions

London - N14

Enquiry from: Rómulo V

Start Date: Immediate

House extensions enquiry

Post a similar request >

09 Oct

House extensions

Ruislip - HA4

Enquiry from: Kanti M

Start Date: 1 to 3 months

Mr lives in the ruislip area and would like a call to discuss options

Property: detached

Post a similar request >

07 Oct

House extensions

Croydon - CR0

Enquiry from: Anjana G

Start Date: Immediate

Property: semi detached · When: immediate

Post a similar request >

06 Oct

House extensions

London - NW9

Enquiry from: Ekrem M

Start Date: Immediate

House extensions enquiry

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 into

Property: semi detached · When: immediate

Post a similar request >

15 Apr

House extensions

London - SW19

Enquiry from: Intisar C

Start Date: Immediate

House extensions enquiry

Post a similar request >

09 Apr

House extensions

London - SW16

Enquiry from: Andrea C

Start Date: Immediate

House extensions enquiry

Post a similar request >

09 Jan

House extensions

London - NW2

Enquiry from: Naciye H

Start Date: Immediate

House extensions enquiry

Post a similar request >

Advertisement

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 Westminster

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

Hire with confidence

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

Our reviews

Average

We haven't decided yet

We haven't decided yet

Helped find a good company without ...

Helped find a good company without all the ringing around

Simple process which gets you resul ...

Simple process which gets you results! Well done.

FAQs

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.

where to start with a house extension?

Have you decided to improve your property instead of moving? The common problem most homeowners face after deciding to embark on a home extension project is not knowing where to start. In this article we’ll walk you through everything you need to consider and put in place before commencement of your home extension project.

• Is the extension worth it?

Before breaking the bank, you must be sure that the project will add good value to your home. In terms of “value, this is not only limited to the financial gain after disposal of the property, but also several other juicy benefits to be derived from extending your home like an extra living space for the household to spread out and more.

• Do you need a planning permission?

Check with your local authority to determine whether or not you’ll require to submit an application. You can also consult a building expert like an architect for advice.

• What are the building regulation?

Even though planning permission can be dodged, you can not avoid building regulations. These regulations are the set national minimum standards for construction and design which you must comply with to ensure the safety of the individuals in and around it.

• Who will design the extension?

You have to decided whether you’ll hire a professional architect to design the extension or not.

• Who will manage the building work?

If your home extension project is designed and built by a professional company, they’ll be responsible for the management. However, if you decide to use an architect or designed it yourself, you’ll have to hire a main contractor to manage the build.

• How to set the budget?

There are so many factors that can affect the cost of an extension, so it’s better to get the costs from your builder before proceeding.

• Do I need yo inform my home insurance firm?

Absolutely! This is very important as the new extension may affect the rebuilding cost of your property which could have an impact on the policy premium.

• Do I need to inform my neighbours?

It’s very important to discuss your plan with your neighbours before applying for a planning permission and communicate about the concerns they might have.

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 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.

House extensions

Other Top Projects in Westminster

Customer Reviews

Overall rating:


Westminster House extensions pros are rated 4.4 out of 5 on average: 20 rated pros, 74 reviews, of 159 pros covering the area.
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 Westminster House extensions contractors

Are you a builder in Westminster?

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

Join today