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House Extension in city

House extension comes with a variety of benefits which makes it simple to see why the extension could be a excellent uptick in the potential rate of your residential property in regards to sales. So if you're wanting to construct a new home extension but still not convinced regarding the job, we're here to help you. Being completely aware any residence building and construction job is generally a hefty financial investment, there's a massive demand to be set on your decision before arranging the beginning of any job. So are house extensions worth it? Below are some of the leading benefits used by house extensions to aid you choose if it's the most appropriate course for you.

 

What's Involved in Adding an Extension?

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

 

  1. Obtaining Building Regulations or Planning Permission (if required as the extension is larger than permitted development).
  2. Inspecting your leasehold arrangement (if applicable) to make certain you can do what you intend to do.
  3. Getting an architect  to create the plans, considering your intended usage ( cooking area, washroom, study).
  4. Hiring a competent builder with experience of larger projects.
  5. Calling your insurance coverage carrier to let them recognize of the prepared work ahead of it beginning.
  6. Acquiring auto parking allows if required for your service providers to guarantee they have easy access to your house.
  7. Making certain all intended work drops within allowed allowables.
  8. Clearing the space as well as digging deep into if essential, consisting of the elimination of trees.
  9. Building work can start.

 

What is the expense of a house extension in city?

If you're thinking about including a two floor house extension, after that setting a budget for this task would certainly be a terrific means to begin. Similar to a rear extension, a 2 storey extension generally leaves the rest of the building requiring some work and also, as a result of its size, this might imply the re-development of the entire house - which is why they can be really pricey. Several of the other influencing aspects that can have large influence on a two floor house extension cost consists of: your location, the size of the construct, intricacy of the layout (anything beyond the typical develop will usually require more know-how as well as time), the glazing to be integrated (the a lot more the glass utilized in the task, the more the product price), along with the group used.

Average House extensions cost in Barnet

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

House extensions installation cost in Barnet 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 Barnet in June 2026

15,008

Requests for quotations in Barnet in June 2026

89

Requests for House extensions quotations in Barnet in June 2026. 0% change from May 2026.

130

Requests for House extensions quotations in Hertfordshire in June 2026. 0% change from May 2026.

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

House extensions searches in cities and towns near Barnet June 2026

89

Requests for quotations in Barnet in June 2026

55

Requests for quotations in Enfield in June 2026

10

Requests for quotations in Potters Bar in June 2026

10

Requests for quotations in Waltham Cross in June 2026

3

Requests for quotations in Broxbourne in June 2026

Barnet

Barnet is a substantial London borough with a population boasting 356,400. The fact is, it's the second largest borough in England's capital city with an region of 86.74 square kilometres. Formed in 1965, the area belongs to both Middlesex and Hertfordshire. Be sure to identify your ideal home improvement firm in Barnet by matching up no cost quotations.

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House extensions pros in Barnet

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.

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 Barnet

19 Apr

House Extensions

Barnet - EN5

Enquiry from: Folakemi E

Start Date: 1 to 3 months

customer made an online enquiry for house extension and confirmed on telephone, sms and email they would like a call with a builder to discuss prices.please call to arrange an appointment to quote. ar...

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28 Oct

House Extensions

Barnet - EN5

Enquiry from: Lara E

Start Date: Immediate

i would like a back extension

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24 Aug

House Extensions

Barnet - EN4

Enquiry from: Jing G

Start Date: Immediate

i would like to build a brick porch (1.5m x 2m) with a door, two windows and pitched roof. are you the property owner: owner of the property do you have plans drawn up: no do you have planning permiss...

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19 Aug

House Extensions

Barnet - EN4

Enquiry from: Jing G

Start Date: Immediate

i would like to build a brick porch (1.5m x 2m) with a door, two windows and pitched roof. are you the property owner: owner of the property do you have plans drawn up: no do you have planning permiss...

Post a similar request >

17 Aug

House Extensions

Barnet - EN5

Enquiry from: Mark H

Start Date: Immediate

*homeowner kitchen extension 3.3 metres by 4 metres 3 metre no food doors right hand wall is a plain solid wall left hand wall has 1 metre width large window walls to externally match white tender of ...

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13 Aug

House Extensions

Barnet - EN4

Enquiry from: Jing G

Start Date: Immediate

i would like to build a brick porch (1.5m x 2m) with a door, two windows and pitched roof. are you the property owner: owner of the property do you have plans drawn up: no do you have planning permiss...

Post a similar request >

10 Aug

House Extensions

Barnet - EN4

Enquiry from: Jing G

Start Date: Immediate

i would like to build a brick porch (1.5m x 2m) with a door, two windows and pitched roof. are you the property owner: owner of the property do you have plans drawn up: no do you have planning permiss...

Post a similar request >

08 Aug

House Extensions

Barnet - EN4

Enquiry from: Jing G

Start Date: Immediate

i would like to build a brick porch (1.5m x 2m) with a door, two windows and pitched roof. are you the property owner: owner of the property do you have plans drawn up: no do you have planning permiss...

Post a similar request >

02 Aug

House Extensions

Barnet - EN4

Enquiry from: Jing G

Start Date: Immediate

i would like to build a brick porch (1.5m x 2m) with a door, two windows and pitched roof. are you the property owner: owner of the property do you have plans drawn up: no do you have planning permiss...

Post a similar request >

18 Oct

House Extensions

Barnet - EN4

Enquiry from: Kele O

Start Date: Immediate

double storey extension and single storey rear extension. I also have the drawings for the proposed extension Customer is currently in the process of looking for quotes to add a Double storey extensio...

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16 Jul

House Extensions

Barnet - EN5

Enquiry from: Folu K

Start Date: Less than one month

Great, do you have plans or planning permission in place? No So, what storey extension are you after? Single Storey I want to build a permitted summer house in my garden Customer is currently in the p...

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23 Jun

House Extensions

Barnet - EN5

Enquiry from: Sam S

Start Date: Immediate

Customer made enquiry for House Extension quotes online. Confirmed via SMS at 12:35 Homeowner lives in Barnet area. Please call to arrange appointment

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16 Oct

House Extensions

Barnet - EN5

Enquiry from: Laura T

Start Date: Less than one month

*Homeowner House extension Please call to appoint

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11 Oct

House Extensions

Barnet - EN5

Enquiry from: Laura T

Start Date: Less than one month

An extension two storey to our potton home Are you the property owner: Owner of the property Property Type: Detached Do you have planning permission: Yes Do you have plans drawn up: No Do you require ...

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25 Apr

House Extensions

Barnet - EN5

Enquiry from: Lara E

Start Date: Immediate

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

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31 Mar

House Extensions

Barnet - EN5

Enquiry from: Sue F

Start Date: Less than one month

Are you the property owner: Owner of the property Property Type: Semi detached Other Forms: 45, 17 Agreed to recieve quotes for selected products: Yes Please call to appoint

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19 Feb

House Extensions

Barnet - EN5

Enquiry from: Irene D

Start Date: 1 to 3 months

Are you the property owner: Owner Have you considered getting your windows replaced to match a new conservatory: No Other Forms: 45 Agreed to recieve quotes for selected products: Yes Please call to ...

Post a similar request >

01 Feb

House Extensions

Barnet - EN5

Enquiry from: Kishore K

Start Date: Immediate

Hi, I have a mid terraced house built in 1940s. Width is approx 5.6 Meter. I would like to get 6meter extension with new kitchen and a bath room with toilet. Before I start working on the financials ...

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25 Aug

House Extensions

Barnet - EN4

Enquiry from: Henry S

Start Date: 3+ months

single storey extension Homeowner Please contact to appoint

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31 Mar

House Extensions

Barnet - EN5

Enquiry from: S R

Start Date: 3+ months

looking to do a single storey rear extension 5m depth and full width which is about 6.4m.

Post a similar request >

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FAQs

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.

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.
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.

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.

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