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House Extension in city

House extension features a vast array of advantages that makes it easy to see why the extension could be a excellent uptick in the possible price of your residential or commercial property in terms of sales. So if you're looking to develop a new house extension however still not convinced concerning the project, we're below to help you. Being fully conscious any type of home building and construction work is normally a heavy investment, there's a significant demand to be set on your choice prior to setting up the beginning of any kind of work. So are house extensions worth it? Below are a few of the top advantages offered by house extensions to assist you make a decision if it's the most ideal route for you.

 

What's Involved in Adding an Extension?

The steps will certainly vary relying on the range of your extension, however you can anticipate some, if not all, of the below to be included when adding an expansion to your residence:

 

  1. Obtaining Building Regulations or Planning Permission (if required as the extension is larger than permitted development).
  2. Checking your leasehold contract (if relevant) to make sure you can do what you want to do.
  3. Getting an architect  to prepare the plans, considering your planned use ( cooking area, shower room, research study).
  4. Hiring a competent builder with experience of larger projects.
  5. Calling your insurance policy provider to allow them understand of the planned job ahead of it beginning.
  6. Obtaining auto parking allows if needed for your professionals to ensure they have simple access to your property.
  7. Making sure all intended work falls within permitted allowables.
  8. Clearing up the space and also excavating if needed, including the elimination of trees.
  9. Structure job can start.

 

What is the expense of a house extension in city?

If you're considering adding a two floor house extension, after that establishing a budget for this job would certainly be a wonderful method to start. Comparable to a back extension, a two storey extension typically leaves the rest of the structure needing some job and also, due to its dimension, this may imply the re-development of the entire house - which is why they can be really costly. A few of the various other influencing variables that can have large influence on a 2 floor house extension price includes: your area, the dimension of the build, intricacy of the layout (anything beyond the common develop will typically require even more knowledge and also time), the glazing to be incorporated (the much more the glass used in the project, the extra the product cost), along with the group used.

Average House extensions cost in Carshalton

The regular cost of House extensions are £51,667 in Carshalton. Costs vary based upon the materials and the company picked. The upper price range can be as high as £73,000. The material costs are in most cases around£10,500.

Average price per House extensions job in 2026

Avg. price low

Avg. price low
£32,000

Avg. price

Avg. price
£51,667

Avg. price high

Avg. price high
£73,000

£73500

£55125

£36750

£18375

£0

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

House extensions installation cost in Carshalton 2026

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

House extensions searches in July 2026

House extensions Projects in Carshalton in June 2026

2,979

Requests for quotations in Carshalton in June 2026

15

Requests for House extensions quotations in Carshalton in June 2026. -21% change from May 2026.

180

Requests for House extensions quotations in Surrey in June 2026. -25% change from May 2026.

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

House extensions searches in cities and towns near Carshalton June 2026

32

Requests for quotations in Morden in June 2026

15

Requests for quotations in Carshalton in June 2026

10

Requests for quotations in Banstead in June 2026

10

Requests for quotations in Sutton in June 2026

0

Requests for quotations in Wallington in June 2026

Carshalton

Carshalton is a suburban area inside the London Borough of Sutton and it's situated near the River Wandle. Five wards make up the Carshalton region, providing a overall population to 45,525 and the region is positioned towards the southwest of Greater London. For all property developments you're thinking about, make certain to compare and contrast quotations between vetted businesses in the area and get the right price for your next project.

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House extensions pros in Carshalton

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.

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...

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 Carshalton

09 Aug

House Extensions

Carshalton - SM5

Enquiry from: Rohit T

Start Date: Immediate

house extension side and rear, l shape extension - side 8m by 2.3m rear 4m by 7.8m with internal finish with plasterboard. property type: semi detached looking for: single storey extension do you hav...

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25 Feb

House Extensions

Carshalton - SM5

Enquiry from: Laura E

Start Date: Immediate

Small ground floor extension to our kitchen / living space to include small utility room and toilet. Appox. 3x2m. Loft extension to include one bedroom and bathroom. The property is a semi-detached ...

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25 Feb

House Extensions

Carshalton - SM5

Enquiry from: Laura E

Start Date: Immediate

Small ground floor extension to our kitchen / living space to include small utility room and toilet. Loft extension to include one bedroom and bathroom. The property is a semi-detached house. We wo...

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10 Apr

House Extensions

Carshalton - SM5

Enquiry from: Kevin J

Start Date: Immediate

double side extension, single rear extension.

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20 Feb

House Extensions

Carshalton - SM5

Enquiry from: Praba T

Start Date: Immediate

kitchen extesion

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29 Jan

House Extensions

Carshalton - SM5

Enquiry from: Gianluca U

Start Date: Immediate

I need to extend my kitchen at rear of my property measure are 5 x3 more or less

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25 Jan

House Extensions

Carshalton - SM5

Enquiry from: Pravin S

Start Date: Less than one month

*Homeowner House extension Supplied and fitted Please call to appoint

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22 Jan

House Extensions

Carshalton - SM5

Enquiry from: Pravin S

Start Date: Less than one month

*Homeowner House extension Supplied and fitted Please call to appoint

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20 Jan

House Extensions

Carshalton - SM5

Enquiry from: Pravin S

Start Date: Less than one month

Property Type: Terrace Have you got a rough idea of the design you would like: Some Ideas How many bedrooms are you looking to have: 1-2 Bedrooms How many storeys are you looking for the property to h...

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08 Dec

House Extensions

Carshalton - SM5

Enquiry from: Sab M

Start Date: Immediate

Customer visited the myhouseextension.co.uk site and submitted an enquiry. Property type: Terrace, Work description: single story back extension Are you the property owner: Owner of the propert...

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29 Aug

House Extensions

Carshalton - SM5

Enquiry from: Ehsan R

Start Date: Immediate

Submit your free quote for rated tradespeople

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17 Jul

House Extensions

Carshalton - SM5

Enquiry from: G S

Start Date: Immediate

Homeowner 4m x 4m extension Plans and planning permission available Please contact to appoint *

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06 Jul

House Extensions

Carshalton - SM5

Enquiry from: Ade O

Start Date: Immediate

Customer visited the myhouseextension.co.uk site and submitted an enquiry. Property type: Terrace, Work description: rear extension/lean to style with slate roof to cover the width of the house . w...

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12 Dec

House Extensions

Carshalton - SM5

Enquiry from: J-Dominique S

Start Date: Immediate

Further extend an existing side house extension and join up with kitchen. Current existing side extension is 2.9m long x 1.5 wide. Another 5m extension along the house to permit an extension of the c...

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16 Oct

House Extensions

Carshalton - SM5

Enquiry from: R

Start Date: Immediate

Moving house. New house has single garage - would like to convert garage and also have extension across the top

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02 Sep

House Extensions

Carshalton - SM5

Enquiry from: Pete B

Start Date: Immediate

I'm looking at converting my garage, loft conversion and a modern single storey extension to the rear which will create a large kitchen diner area

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04 Jul

House Extensions

Carshalton - SM5

Enquiry from: Martina C

Start Date: Immediate

Home owner Single story extension - extend kitchen approx 4x4m. It will have plain walls except for one side which will have folding doors. I would like a sloping roof with skylight/velux. We have dr...

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22 Jun

House Extensions

Carshalton - SM5

Enquiry from: Waidi A

Start Date: 3+ months

Single Storey rear extension, spanning 3.5metres by 8m. Flat roof fiberglass warm roof, total height of extension is 2.9metres. Includes creating 2 wall openings which will require steel beams. In...

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02 May

House Extensions

Carshalton - SM5

Enquiry from: Paul W

Start Date: Immediate

I am interested in extending this existing extensions Are you the property owner: Owner of the property Property Type: Semi detached Looking For: Single storey extension Do you have planning permissio...

Post a similar request >

13 Apr

House Extensions

Carshalton - SM5

Enquiry from: Martina C

Start Date: Immediate

An extra living space off the kitchen approx 4x4m. It will have plain walls except for one side which will have folding doors. I would like a sloping roof with skylight/velux. We have dry air centr...

Post a similar request >

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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.

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.

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.

Do I need my neighbours’ permission for an extension?

Well the reality is, sometimes, neighbours just don’t get along. With several individuals living in close proximity, it’s little surprise they tend to get on one another’s nerves from time to time. However, there’s a difference between having a tiff and being able to transform your house the way you want without having to obtain your neighbour’s approval.

The short and simple answer to this question is, not necessarily. However, you must first educate yourself by thinking about your extension and how it affects the houses around you. We’d strongly recommend you talk proposals through with your neighbour so as to avoid possible conflicts later. There are a number of reasons why your neighbour can protest to your new home extension plans. Let’s take a look!

 

  • In the event whereby your new extension is blocking their view or providing an unwanted shade on their property. Here, they have a legitimate reason to protest as no one would want their once sunny garden suddenly covered or plummet into shade.
  • In the event where it leads to a loss of privacy. For instance, if your new extension possesses a window which overlooks the neighbour’s property in any way. This is likely to be taken as an invasion of privacy and that has a little to no chance of being a welcomed idea.
  • If it’s a major project and going to take a lot of weeks before completion. The noise generated, especially when your neighbours are enjoying your summer holidays or weekends, can make their gardens not as relaxing as it used to be.
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Carshalton House extensions installers are rated 4.4 out of 5 based on 12 reviews of 93 pros.
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