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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 September 2026

House extensions Projects in Harrow in August 2026

7,828

Requests for quotations in Harrow in August 2026

42

Requests for House extensions quotations in Harrow in August 2026. 24% change from July 2026.

50

Requests for House extensions quotations in Middlesex in August 2026. 25% change from July 2026.

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

House extensions searches in cities and towns near Harrow August 2026

42

Requests for quotations in Harrow in August 2026

20

Requests for quotations in Wembley in August 2026

9

Requests for quotations in Stanmore in August 2026

9

Requests for quotations in Edgware in August 2026

5

Requests for quotations in Ruislip in August 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

Start Date: Immediate

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

Start Date: Immediate

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

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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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

House Extensions

Harrow - HA3

Enquiry from: Sangarsh S

Start Date: Less than one month

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

House Extensions

Harrow - HA3

Enquiry from: GEETA U

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24 Oct

House Extensions

Harrow - HA1

Enquiry from: Balakrishnan A

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FAQs

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.

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.
Can I extend the front of my house?

When it comes to extending a home, the rear of the house often comes to mind a lot more than the front. However, this doesn’t mean that you can’t extend the front of your house. This can be done either as part of a renovation project whereby the entire house is incorporated or it can also be done in isolation. It’s possible to extend the front of your house without the need to apply for a planning permission, however, there are a bunch of limitations you’d have to comply with if you wish to carry out with such a project. Sometimes, this may imply that extending to the front of your home is more tedious and tasking than extending your home’s rear. So exactly how far can you extend the front of your home without planning permission?

 

The short and simple answer to this question is 2 metres square area with a height not more than 3 metres. Generally, you do not need a planning permission to build a front porch as long as its area doesn’t go beyond 2 square metres from a public road or walkway. Also, a tiled or slated roof can be as much as 4 metres but other roofs must not go beyond 3 metres in height. If you want to extend the front of your home beyond the restrictions specified, then you’ll have to apply for a planning permission.

 

Extending the front of home can be quite costly, but this can be controlled by not building to the extension to the highest specification, not including an extension on kitchens or bathrooms and more.

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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