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House Extension in city

House extension features a variety of advantages that makes it simple to see why the extension could be a wonderful uptick in the potential price of your property in terms of sales. So if you're seeking to construct a brand-new home extension however still not persuaded about the project, we're below to help you. Being fully mindful any residence building work is generally a hefty financial investment, there's a huge requirement to be set on your choice prior to scheduling the start of any kind of work. So are house extensions worth it? Below are a few of the top advantages supplied by house extensions to assist you choose if it's the most appropriate route for you.

 

What's Involved in Building an Extension?

The actions will certainly vary depending on the scope of your extension, however you can expect some, otherwise all, of the below to be included when adding an expansion to your house:

 

  1. Acquiring Building Regulations or Planning Permission (if required as the extension is larger than permitted development).
  2. Checking your leasehold arrangement (if suitable) to ensure you can do what you wish to do.
  3. Enlisting an architect  to draw up the plans, considering your expected use (kitchen, washroom, office).
  4. Hiring a competent builder with experience of larger projects.
  5. Contacting your insurance policy carrier to allow them know of the planned work ahead of it beginning.
  6. Getting car park allows if needed for your specialists to guarantee they have simple accessibility to your house.
  7. Making sure all planned job drops within allowed allowables.
  8. Clearing the space and digging deep into if necessary, consisting of the elimination of trees.
  9. Building job can begin.

 

What is the price of a house extension in city?

If you're considering adding a 2 storey house extension, after that setting a budget for this job would certainly be a excellent method to get going. Similar to a back extension, a 2 floor extension typically leaves the rest of the building requiring some work and also, due to its size, this might indicate the re-development of the entire house - which is why they can be extremely pricey. A few of the various other affecting factors that can have huge impact on a 2 floor house extension cost includes: your location, the dimension of the build, complexity of the design (anything past the basic construct will typically require more know-how and also time), the glazing to be incorporated (the extra the glass made use of in the job, the extra the product expense), in addition to the group made use of.

Average House extensions cost in Brentford

The regular cost of House extensions are £51,667 in Brentford. 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 Brentford, as reported by local LeadsDoWork members.

House extensions installation cost in Brentford 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 Brentford in June 2026

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Requests for quotations in Brentford in June 2026

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Requests for House extensions quotations in Brentford in June 2026. -100% change from May 2026.

50

Requests for House extensions quotations in Middlesex 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 Brentford June 2026

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Requests for quotations in Teddington in June 2026

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Requests for quotations in Ashford in June 2026

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Requests for quotations in Hounslow in June 2026

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Requests for quotations in Feltham in June 2026

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Requests for quotations in Hampton in June 2026

Brentford

The West London town of Brentford forms an area of the Borough of Hounslow and it is found at the confluence of the River Thames by having a populace of close to 50,000. Brentford doesn't have much in the way of modern homes with a lot of houses dated from the 1930s, meaning there's always home upgrades required in the area. For work you want carried out make certain only to use vetted tradesmen in Brentford for the right price and quality work.

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House extensions pros in Brentford

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.

Tectra Partnership Ltd

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

Latest review

Deepak S., KT10
5

House Extensions in Esher

excellent communication

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 Brentford

06 Apr

House Extensions

Brentford - TW8

Enquiry from: Shelley C

Start Date: Less than one month

Customer visited the myhouseextension.co.uk site and submitted an enquiry. Property type: Semi detached, Work description: Ground floor extension to include a new kitchen Are you the property owner:...

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17 Jun

House Extensions

Brentford - TW8

Enquiry from: Tolo D

Start Date: Immediate

Kitchen extension, lounge extension and refurbishment Are you the property owner: Owner of the property Property Type: Semi detached Looking For: Single storey extension Do you have planning permiss...

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28 Apr

House Extensions

Brentford - TW8

Enquiry from: Barbara M

Start Date: Immediate

Internal measurements are approx 6'6 x 3'6 brick wall + toughened opaque glass + opening window on side. Are you the property owner: Owner of the property Do you have planning permission: No What m...

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15 Jul

House Extensions

Brentford - TW8

Enquiry from: Paul J

Start Date: 3+ months

Build extension room Homeowner Please contact to appoint

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12 Apr

House Extensions

Brentford - TW8

Enquiry from: D

Start Date: Immediate

Single story extention

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28 Feb

House Extensions

Brentford - TW8

Enquiry from: C

Start Date: Immediate

Kitchen extension on a terrace house

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04 Aug

House Extensions

Brentford - TW8

Enquiry from: K N

Start Date: Immediate

3x4 extension is required. Home Owner Single Storey No Plans Drawn Up Call To Appoint * Please Call From 05/08 After 12pm

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20 May

House Extensions

Brentford - TW8

Enquiry from: Andrew V

Start Date: 1 to 3 months

Home Owner double storey side extension, (as next door neighbour has done) but addition extension at the back of the house to extend the kitchen. assistance with planning application may be required...

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08 Apr

House Extensions

Brentford - TW8

Enquiry from: Andrew V

Start Date: 1 to 3 months

Home Owner double storey side extension, (as next door neighbour has done) but addition extension at the back of the house to extend the kitchen. assistance with planning application may be required...

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06 Apr

House Extensions

Brentford - TW8

Enquiry from: M S

Start Date: Immediate

Home owner I want to convert double large bed room in to two small bedrooms call to appoint

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20 Feb

House Extensions

Brentford - TW8

Enquiry from: Lena M

Start Date: 3+ months

Homeowner House extension 1 storey extension Supplied and installed Please contact to appoint *

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FAQs

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.

how to finance a house extension?

Do you want to beautify and increase the value of your home? If yes, a refurb and house extension is definitely a great option to consider. Depending on your home extension project, the value that’ll be added to your home’s resale value varies. However, the cost of completing a house extension project can be huge, so you just might want to consider your financing options. Fortunately, there are various options through which your house extension project can be funded with each having its own pros and cons. Your specific circumstances will determine the one that’s going to work best for you, so let’s take a look at some of the best options to help you fund your project.

• Home Remortgaging

The process whereby a mortgage is transferred from one provider to the other is known as remortgaging. This is usually done to generate funds for a project by entering a more lengthy repayment term commitment when switching. If you want to raise your funds in a quick manner, this process works best.

• Savings

This is a good reason to cultivate a good saving habits. If you’ve been able to save up some mega bucks then you’d probably won’t have to borrow money to finance your house extension.

• Unsecured Loans

If you do not buy into the idea of borrowing more against your property, you may just be able to apply for an unsecured loan especially if you have a good credit record. A secured loan makes use of collaterals like a car or house to serve as a cover for the lender, meanwhile an unsecured loan is based mainly on the credit managing history of the borrower.

• Credit Card

There are some great benefits that comes with financing your small or medium scale extension project with your credit card. Not only does it offer some real lifeline if problems arise during the project, but you can also avoid paying excessive interest on the investment by ensuring your deal has a 0% introductory rate.

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 big can my house extension be?

The holy grail of home extensions is basically the need for additional space for living as well as leisure. However, before commencing your home extension project, you’d probably want to know just how big your new building can be. In this article, you’ll find the answer to this question which is also frequently asked by many other home or property owners in the UK.

Besides your budget, there are two other major influencing factors that can determine just how much extra room that can be added. These factors include whether you wish to carry out the extension project under Permitted Development rights which is usually for a smaller project or you’d prefer to opt for a larger project which is covered by Planning Permission.

Apart from the limitations in the size of an extension under Permitted Development, the extensions are also a lot more affordable and consumes less time when compared to the extensions under planning permission. So what exactly is the size limit for an extension under Permitted Development and the ones under Planning Permission?

For a single storey extension, the maximum size that can be constructed without having to submit an application for Planning Permission includes:

• An extension should have a maximum length of 6m, if you reside in a terraced home or a semi-detached property.

• Extensions for detached properties can have a maximum length of 8m.

• The extension built must not go beyond half your garden’s area.

• The extension should have a maximum height of 4 metres, but in the event whereby the extension is situated within 2 metres of the boundary of your property, it should not exceed a height of 3 metres.

• The extension should not be higher than the highest part of the existing house’s roof.

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Brentford House extensions installers are rated 4.5 out of 5 based on 13 reviews of 108 pros.
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