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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 £53,000 in Barnet. Costs vary based upon the materials and the company picked. The upper price range can be as high as £75,600. The material costs are in most cases around£10,500.

Average price per House extensions job in 2025

Avg. price low

Avg. price low
£32,400

Avg. price

Avg. price
£53,000

Avg. price high

Avg. price high
£75,600

£76100

£57075

£38050

£19025

£0

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

House extensions installation cost in Barnet 2025

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

House extensions searches in January 2025

House extensions Projects in Barnet in December 2024

15,008

Requests for quotations in Barnet in December 2024

89

Requests for House extensions quotations in Barnet in December 2024. 0% change from November 2024.

130

Requests for House extensions quotations in Hertfordshire in December 2024. 0% change from November 2024.

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

House extensions searches in cities and towns near Barnet December 2024

89

Requests for quotations in Barnet in December 2024

55

Requests for quotations in Enfield in December 2024

10

Requests for quotations in Waltham Cross in December 2024

10

Requests for quotations in Potters Bar in December 2024

3

Requests for quotations in Broxbourne in December 2024

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

Post a similar request >

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

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.

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.

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.

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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