House Extension in city

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House Extension in city

House extension includes a wide range of benefits that makes it very easy to see why the extension could be a fantastic uptick in the potential price of your building in regards to sales. So if you're wanting to develop a brand-new home extension however still not persuaded about the job, we're below to help you. Being totally aware any type of house building and construction work is typically a hefty investment, there's a significant demand to be set on your choice prior to setting up the start of any work. So are house extensions worth it? Below are some of the leading benefits supplied by house extensions to help you choose if it's the most suitable route for you.

 

What's Associated with Building an Extension?

The steps will certainly differ depending upon the extent of your extension, yet you can expect some, if not all, of the below to be included when including an expansion to your house:

 

  1. Acquiring Building Regulations or Planning Permission (if needed as the extension is larger than permitted development).
  2. Examining your leasehold agreement (if suitable) to ensure you can do what you intend to do.
  3. Employing an architect  to create the plans, considering your planned usage (kitchen, bathroom, research study).
  4. Hiring a competent builder with experience of larger projects.
  5. Contacting your insurance carrier to let them recognize of the intended job ahead of it starting.
  6. Getting vehicle parking allows if needed for your professionals to guarantee they have very easy access to your building.
  7. Making sure all prepared work falls within allowed allowables.
  8. Cleaning the space as well as digging deep into if necessary, including the removal of trees.
  9. Building work can begin.

 

What is the expense of a house extension in city?

If you're taking into consideration including a 2 floor house extension, after that establishing a budget for this job would be a terrific method to begin. Comparable 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 imply the re-development of the whole house - which is why they can be very expensive. Several of the various other influencing aspects that can have huge influence on a two storey house extension price consists of: your place, the dimension of the develop, intricacy of the style (anything past the basic build will generally call for even more proficiency and time), the glazing to be incorporated (the extra the glass made use of in the job, the much more the product price), in addition to the group used.

Average House extensions cost in Harrow

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

House extensions installation cost in Harrow 2026

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

House extensions searches in June 2026

House extensions Projects in Harrow in May 2026

7,828

Requests for quotations in Harrow in May 2026

42

Requests for House extensions quotations in Harrow in May 2026. 24% change from April 2026.

50

Requests for House extensions quotations in Middlesex in May 2026. 25% change from April 2026.

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

House extensions searches in cities and towns near Harrow May 2026

42

Requests for quotations in Harrow in May 2026

20

Requests for quotations in Wembley in May 2026

9

Requests for quotations in Stanmore in May 2026

9

Requests for quotations in Edgware in May 2026

5

Requests for quotations in Ruislip in May 2026

Harrow

Without doubt one of London's most heavily populated boroughs holds just over 239,000 and is set towards the northeast of the capital. The town of Harrow was established in 1934, transforming into a borough in 1954. The borough has a contrast in affluence; while there are high-end areas including Harrow-on-the-Hill and Pinner, a 2011 report shows 7,000 children are in poverty. Don't spend more than you need to for your property improvements and get the right price from vetted companies.

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House extensions pros in Harrow

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 Harrow

26 Oct

House Extensions

Harrow - HA3

Enquiry from: Divyaba R

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 Harrow area Please call to arrange an appointment

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23 Jan

House Extensions

Harrow - HA1

Enquiry from: Mahmood K

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Flat roof kitchen extension at rear. Labour only builder required. All my material

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11 Aug

House Extensions

Harrow - HA2

Enquiry from: Archit J

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Rear extension squaring off. We have half of the width of the house already extended to the rear. Now want to square it off by extending the remaining ~4 meter width to similar 6 meter depth. So area ...

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06 Dec

House Extensions

Harrow - HA3

Enquiry from: S Nasir Z

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customer has a extensions & conversions project they are looking to have done, specially they want quotes for house extension. they are unsure of options so would like to discuss with a builder.confir...

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13 Aug

House Extensions

Harrow - HA3

Enquiry from: Parul K

Start Date: Immediate

customer made an enquiry for house extension and confirmed on the quotatis site they would like quotes from a builder.mrs lives in the harrow area and would like a call to discuss options.see below de...

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04 Mar

House Extensions

Harrow - HA1

Enquiry from: Steve S

Start Date: Immediate

i am at the planning stage of a 6x7m wraparound ground floor rear and side extension on my semi-detached house and am interested in using sips panels for the construction. customer is currently in th...

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26 Oct

House Extensions

Harrow - HA2

Enquiry from: Maz K

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customer has a extensions & conversions project they are looking to have done, specially they want quotes for house extension. they are unsure of options so would like to discuss with a builder.confir...

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13 Aug

House Extensions

Harrow - HA3

Enquiry from: Sid E

Start Date: Immediate

customer has a extensions & conversions project they are looking to have done, specially they want quotes for house extension. they are unsure of options so would like to discuss with a builder.confir...

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14 Dec

House Extensions

Harrow - HA3

Enquiry from: Vas R

Start Date: Immediate

are you the property owner: owner have you considered getting your windows replaced to match a new conservatory: no other forms: house extension agreed to receive quotes for selected products: yes pl...

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08 Aug

House Extensions

Harrow - HA1

Enquiry from: Adam H

Start Date: Immediate

i would like a quote on an outbuilding at the back of the garden, and levelling of garden. customer is currently in the process of looking for quotes to add a single storey extension to their propert...

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02 Mar

House Extensions

Harrow - HA2

Enquiry from: Himesh C

Start Date: Less than one month

Semi detached house look for a loft extention, a 2 storey extention width of 4 meters by 7 meters. Shell only with box roof on existing and on the new. A new staircase 2 bathroom. Using concrete panel...

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30 Jan

House Extensions

Harrow - HA3

Enquiry from: Vishwaraj G

Start Date: Immediate

Are you the home owner of that property? Yes Are you replacing an existing porch or is this a new build? New Build What material do you require, UPVC? UPVC What colour do you want it to be? Unsure I a...

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16 Oct

House Extensions

Harrow - HA3

Enquiry from: Jignesh V

Start Date: Immediate

I already have 1st floor extension where one side wall is full 2.2 metre height while the other end is only 1 meter height. I want to bring this wall to a full height. The roof to match with the curre...

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23 Sep

House Extensions

Harrow - HA3

Enquiry from: Jignesh V

Start Date: Immediate

I already have 1st floor extension where one side wall is full 2.2 metre height while the other end is only 1 meter height. I want to bring this wall to a full height. The roof to match with the curre...

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17 Jul

House Extensions

Harrow - HA2

Enquiry from: Mujahid Z

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brick built shed for office use with toilet

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18 May

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Harrow - HA3

Enquiry from: Sangarsh S

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18 Oyster Quay, Portway Portway Customer is currently in the process of looking for quotes to add a Single storey extension to their property. Are you the property owner: Relative of Owner Property T...

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03 Mar

House Extensions

Harrow - HA2

Enquiry from: Osman K

Start Date: Immediate

We are a building company providing a unique service of utilising spaces. Would be nice to get some leads. Kind regards

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20 Nov

House Extensions

Harrow - HA3

Enquiry from: GEETA U

Start Date: Immediate

Homeowner Please contact to appoint

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14 Nov

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Harrow - HA3

Enquiry from: GEETA U

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24 Oct

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Harrow - HA1

Enquiry from: Balakrishnan A

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FAQs

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.

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 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.

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.

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Harrow House extensions installers are rated 4.4 out of 5 based on 15 reviews of 111 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 Harrow House extensions contractors

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