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House Extension in city

House extension features a variety of benefits that makes it very easy to see why the extension could be a wonderful uptick in the prospective cost of your residential or commercial property in terms of sales. So if you're aiming to construct a new house extension but still not encouraged concerning the job, we're here to help you. Being totally conscious any home building job is generally a heavy investment, there's a substantial requirement to be set on your decision before setting up the beginning of any kind of job. So are house extensions worth it? Below are a few of the top advantages provided by house extensions to help you make a decision if it's the most appropriate path for you.

 

What's Associated with Adding an Extension?

The steps will certainly vary depending on the extent of your extension, yet you can expect some, if not all, of the below to be entailed 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. Examining your leasehold agreement (if appropriate) to ensure you can do what you intend to do.
  3. Hiring an architect  to prepare the plans, considering your planned usage ( kitchen area, shower room, office).
  4. Hiring a competent builder with experience of larger projects.
  5. Calling your insurance coverage company to allow them recognize of the planned work ahead of it starting.
  6. Acquiring auto parking permits if needed for your service providers to guarantee they have easy accessibility to your residential building.
  7. Making certain all intended job falls within allowed allowables.
  8. Clearing up the space and also excavating if required, consisting of the removal of trees.
  9. Structure work can begin.

 

What is the cost of a house extension in city?

If you're considering including a two floor house extension, after that establishing a budget for this project would certainly be a fantastic method to begin. Comparable to a rear extension, a two floor extension usually leaves the remainder of the building needing some work as well as, because of its size, this may imply the re-development of the whole house - which is why they can be extremely pricey. Several of the other influencing elements that can have big impact on a two floor house extension price includes: your place, the dimension of the build, complexity of the style (anything past the basic build will typically need even more experience as well as time), the glazing to be incorporated (the more the glass made use of in the task, the extra the material cost), as well as the team used.

Average House extensions cost in Islington

The regular cost of House extensions are £53,000 in Islington. 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 Islington, as reported by local LeadsDoWork members.

House extensions installation cost in Islington 2025

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

House extensions searches in May 2025

House extensions Projects in Islington in April 2025

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Requests for quotations in Islington in April 2025

0

Requests for House extensions quotations in Islington in April 2025. 0% change from March 2025.

1,000

Requests for House extensions quotations in London County in April 2025. 14% change from March 2025.

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

House extensions searches in cities and towns near Islington April 2025

Islington

The London Borough of Islington is a London borough in Inner London. It was created in 1965 by merging the previous metropolitan boroughs of Islington and Finsbury, however the merged entity remains the second smallest borough in London and also the third smallest district in England. It covers a total area of 5.74 square miles. The local authority is Islington Council.

The 2011 Census indicated that Islington contains the highest population density of local authorities in England and Wales, with 13875 people per square kilometre. In line with population estimates collected in the middle of 2014, Islington has a permanent population of around 221030 people. The borough is served by a wide variety of transportation services, with direct connections to the suburbs along with the City and West End. In 2011, the main forms of transports that residents used were the underground, metro, light rail and tram, which were utilised by 19.4 per cent of all residents. Another 10.3 per cent used the bus, as well as 10.3 per cent being the figure for people who would walk.

The borough is recognised as the home to football club Arsenal, one of the most successful clubs in England and Emirates Stadium, which is one of the largest football stadiums in Britain. Other notable attractions range from the London Canal Museum along with the King's Head Theatre.

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House extensions pros in Islington

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.

Blue SKY Developers Limited

1 review(s)
Based: in London, NW3 6DX

Blue Sky Developers is a registered company in the UK that specialises in all building services you could require. We are based in North London but carry work out all around London.

Latest review

Vikram D., NW7
4

House Extensions in Mill Hill

Very straight and helpful. Provided useful advice and suggestions.

Nicholas James Construction

7 review(s)
Based: in Bromley, BR1 3AX

From past fifteen years we have been established as the finest building and construction service provider to clients in Bromley and its surrounding areas.

Latest review

Jagdish K., HA3
5

House Extensions in Harrow

Absolutely pleasant appointment. Very patient and polite, listened carefully to detail and more of my background and his...

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 Islington

16 Sep

House Extensions

London - N16

Enquiry from: Barbara C

Start Date: Immediate

Loft conversion, bathroom

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22 Aug

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London - N15

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customer in london area has requested that we arrange quotes for their house extension project.mr are considering various options and would like to discuss with a builder directly.please call to discu...

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02 Mar

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27 Feb

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London - N16

Enquiry from: Paul F

Start Date: Immediate

We would like a quote on extending the kitchen in the garden probably by 1.5 metres (to neighbour wall) on the side and 1m on the lenth. Looking For: Single storey extension Do you have planning permi...

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06 Jul

House Extensions

London - N16

Enquiry from: Sam W

Start Date: 1 to 3 months

Rear kitchen extension. Extending current living space full width 6mx8m to add kitchen/diner. New kitchen required. Current kitchen at other side of the flat will be converted into bedroom. Plea...

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22 Oct

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London - N15

Enquiry from: Richard G

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19 Oct

House Extensions

London - N16

Enquiry from: Sue B

Start Date: Immediate

Are you the property owner: Owner of the property Property Type: Terrace Looking For: Single storey extension Do you have planning permission: No Do you have plans drawn up: No Do you require Plumbing...

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30 Sep

House Extensions

London - N15

Enquiry from: Richard G

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03 Sep

House Extensions

London - N1

Enquiry from: Terence D

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Customer is currently in the process of looking for quotes to add a Double storey extension to their property. Are you the property owner: Owner of the property Property Type: Semi detached Looking Fo...

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28 Jun

House Extensions

London - N16

Enquiry from: Hugo S

Start Date: 3+ months

Great, do you have plans or planning permission in place? No So, what storey extension are you after? Single Storey Side return extension, 8m2. Fully-glazed (not Velux) roof over side return. Kitchen...

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29 May

House Extensions

London - N16

Enquiry from: Tom C

Start Date: Immediate

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11 Apr

House Extensions

London - N15

Enquiry from: Laurentiu I

Start Date: 1 to 3 months

Are you the property owner: Owner Have you considered getting your windows replaced to match a new conservatory: Yes How many windows are you looking for: 5+ Other Forms: 17, 45, 50, 19, 5 Agreed to ...

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17 Feb

House Extensions

London - N15

Enquiry from: Monica W

Start Date: 1 to 3 months

Home Owner Call to Appoint Customer is currently in the process of looking for quotes to add a Single storey extension to their property. Are you the property owner: Owner of the property Property T...

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17 Jan

House Extensions

London - N15

Enquiry from: Stefano E

Start Date: Immediate

1 storey rear garden extension Customer is currently in the process of looking for quotes to add a Single storey extension to their property. Are you the property owner: Owner of the property Prope...

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11 Jan

House Extensions

London - N15

Enquiry from: Stefano E

Start Date: Immediate

1 storey rear garden extension Customer is currently in the process of looking for quotes to add a Single storey extension to their property. Are you the property owner: Owner of the property Prope...

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08 Jan

House Extensions

London - N15

Enquiry from: Stefano E

Start Date: Immediate

1 storey rear garden extension Customer is currently in the process of looking for quotes to add a Single storey extension to their property. Are you the property owner: Owner of the property Prope...

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02 Jan

House Extensions

London - N15

Enquiry from: Stefano E

Start Date: Immediate

1 storey rear garden extension Customer is currently in the process of looking for quotes to add a Single storey extension to their property. Are you the property owner: Owner of the property Prope...

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13 Oct

House Extensions

London - N15

Enquiry from: Angela G

Start Date: Immediate

Customer visited the myhouseextension.co.uk site and submitted an enquiry. Property type: Other, Work description: Extension of kitchen area into the front garden Are you the property owner: Tenant ...

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01 Sep

House Extensions

London - E8

Enquiry from: Brian V

Start Date: Immediate

I'm looking for quotes to put a one story side extension on a flat. It would be 6 feet wide by 21 feet long. It would also require a small low area to be backfilled. Please email and I can include flo...

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03 Aug

House Extensions

London - E8

Enquiry from: Tanya M

Start Date: Immediate

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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.

Will my extension be expensive?

It depends on the size and type of extension. Small porches or flat roof extensions are very reasonably priced. More substantial two storey extensions can be expensive. In general, the price is roughly proportional to the amount of space you add to your home.

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 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.

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