House extensions Costs

Compare House Extension Prices Near You

Home > Extensions & Conversions Projects > House extensions

Average House extensions cost

The regular cost of House extensions are £55,929 in your area. Costs vary based upon the materials and the company picked. The upper price range can be as high as £82,929. The material costs are in most cases around£10,500.

Average price per House extensions job in 2024

Avg. price low

Avg. price low
£30,358

Avg. price

Avg. price
£55,929

Avg. price high

Avg. price high
£82,929

£83500

£62625

£41750

£20875

£0

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

House extensions installation cost in your area 2024

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

Advantages for House extensions

  • Create additional usable space within in your home
  • Create more room upstairs, additional bathroom or bedrooms
  • Increases the value of your home
  • As your family grows it means you can stay in the same home for longer

Disadvantages for House extensions

  • Will cause a lot of disruption when the existing house wall is opened up into the extension
  • Upstairs windows should be carefully planned not to look into neighbours homes

House extensions Manufacturers

House extensions FAQs

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.

How much does a two storey house extension cost?

If you’re considering adding a two storey house extension, then setting a budget for this project would be a great way to get started. Similar to a rear extension, a two storey extension usually leaves the rest of the building needing some work and, due to its size, this may imply the re-development of the entire house - which is why they can be very costly. Some of the other influencing factors that can have big impact on a two storey house extension cost includes: your location, the size of the build, complexity of the design ( anything beyond the standard build will normally require more expertise and time), the glazing to be incorporated ( the more the glass used in the project, the more the material cost), as well as the team used.

Generally, when it comes to extensions, the major part of the expenses will be made on the build of the project. This is because it doesn’t only cover the material cost but also the contractor’s overhead as well as the daily rates. At this stage, the extension prices can be determined by the standard of the work that’s being done.

For a fairly average room size of about 18 square metre, the two storey extension should cost within the range of £2,500 to £3,000 per square metre - with the range being determined by the finishes incorporated. Therefore, a two storey extension of about 18 square metre should cost within the range of £45,000 to £55,000. However, this is with the assumption that there are standard window sizes, bathroom suits are modest, and without any need for any purpose joinery or glazing. If you wish to include all these extra features you’ll also have to pay more to make the total cost between £70,000 to £80,000.

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.
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.

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.

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.

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.

Our reviews

Average

Would highly recommend

Would highly recommend, they found me a firm which I was happy with a quote they give me and went ahead and had my job done within 2 days of enquiring.

Good easy way to find a selection of…

Good easy way to find a selection of trades you need all in one place.

Love LeadsDoWork it's a big part of my …

Love LeadsDoWork it's a big part of my Business I would recommend to anyone

Dream the Build

Based: in London, EC1V

DREAM the Build. Ltd ' Constructing your Vision

Making home development exciting, fun and asse...

Latest review

Jagdish K., HA3
4th October 2016

House Extensions in Harrow

In dept details for quotation great approach. Great advice Still going through the qu...

Jassi Builders

Based: in Hayes, UB4

Hi Jassi Builders LTD here, I am a specialist in planning, designing and building control services. ...

Latest review

Julian F., HP2
25th February 2022

House Extensions in Hemel Hempstead

No quote received

B&G Carpentry

Based: in Newhaven, BN9

B&G Carpentry is based in Newhaven and have 5 positive reviews

Latest review

Laurie S., BN12
24th February 2020

House Extensions in Worthing

Hi Bob, I'm very pleased with my new porch. Having phoned me immediately when I cont...

Castell Home Improvements

Based: in Walton-on-thames, KT12

Castell Home Improvements is based in Walton-on-thames and have 2 positive reviews

Latest review

Pravin S., SM5
25th January 2018

House Extensions in Carshalton

Not had any discussion one Cost so far

OJS Building

Based: in Surrey, KT17

OJS Building are a local building firm based in Epsom and offering services to domestic and commerci...

Latest review

Abby E., BN7
14th July 2017

House Extensions in Lewes

Quick home visit and quote

Omega Lifestyle

Based: in Peterborough, PE7

Omega Lifestyle prides itself on providing a high quality of customer service from the initial order...

Latest review

J D., PE32
17th October 2016

House Extensions in King's Lynn

I was so pleased to finally meet a tradesman who actually provided a quote and so qui...

MTL Contractors

Based: in Southampton, SO14

MTL Contractors is based in Southampton and have 2 positive reviews

Latest review

David M., SP10
14th December 2016

House Extensions in Andover

Awaiting quote but service so far has been very good.

Nicholas James Construction

Based: in Bromley, BR1

From past fifteen years we have been established as the finest building and construction service pro...

Latest review

Jagdish K., HA3
4th October 2016

House Extensions in Harrow

Absolutely pleasant appointment. Very patient and polite, listened carefully to detai...

Scotbuild Group

Based: in Fife, KY14

Scotbuild Group is based in Fife and have 7 positive reviews

Latest review

Lesley D., DD4
3rd October 2016

House Extensions in Dundee

I cannot comment on prices as we are not yet at that stage

Options Home Improvements

Based: in Kent, ME8

Here at Options Home Improvements we specialize is the bespoke design & installation of PVCu & Alumi...

Latest review

Lisa V., ME1
7th August 2016

House Extensions in Rochester

I haven't had the extension built yet but am planning to use them

Rated Local builders

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...

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...

Options Home Improvements LTD

1 review(s)
Based: in Kent, ME8 0DB

Here at Options Home Improvements we specialize is the bespoke design & installation of PVCu & Aluminium, windows and doors, orangeries & conservatories in Gillingham, Kent & South East area. Options Home Improvements was started due to the seemi...

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.

Scotbuild Group LTD

7 review(s)
Based: in Fife, KY14 7AU

Scotbuild Group LTD based in Fife, offer services in Extensions & Conversions. They have an average rating of 4.5471428571429 from 7 review(s). See their latest 5 star review below

Build Junky

3 review(s)
Based: in Doncaster, DN9 1AL

We are a high quality building company based on the outskirts of Doncaster. With an aim to produce consistent workmanship of the highest standard alongside giving our customers the very best service available. Alongside carrying ou...

CMK Home Extensions LTD

2 review(s)
Based: in Glasgow, G61 3NU

The alternative to traditional domestic builders CMK Home Extensions bring a modern, professional approach to all your home improvement and extension needs. Whether its a new open plan living space, kitchen diner, family room or sun room we can trans...

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.

Magnus Technical Engineering LTD

6 review(s)
Based: in Appley bridge, WN6 9DB

Magnus Technical Engineering LTD based in Appley bridge, offer services in Extensions & Conversions. They have an average rating of 4.9583333333333 from 6 review(s). See their latest 5 star review below

Tectra Partnership Ltd

1 review(s)
Based: in Slough, SL3 0JE

Tectra Partnership Ltd based in Slough, offer services in Extensions & Conversions. They have an average rating of 4.75 from 1 review(s). See their latest 5 star review below

Similar Customer Enquiries for House extensions

19 Nov

House Extensions

Hounslow - TW3

Enquiry from: Sheldon R

Start Date: Immediate

Customer made an online enquiry for House Extension via one of our websites. Confirmed via . Please call to arrange an appointment to quote.

Post a similar request >

14 Nov

House Extensions

Grays - RM16

Enquiry from: Ryan F

Start Date: Immediate

customer in grays 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 discus...

Post a similar request >

13 Nov

House Extensions

Cambridge - CB1

Enquiry from: Racquel C

Start Date: Immediate

Customer in Cambridge area made an enquiry for House Extension online. Confirmed via SMS at 17:58 Confirmed via email at 17:58 Confirmed via phone at 17:58 Please call to arrange an appointment to di...

Post a similar request >

12 Nov

House Extensions

Haddington - EH41

Enquiry from: Graeme M

Start Date: Immediate

customer in the haddington area made an enquiry a couple of projects including house extension.call anytime and arrange an appointment to discuss. below is some details about this project: are you the...

Post a similar request >

08 Nov

House Extensions

Milton Keynes - MK17

Enquiry from: Antonio R

Start Date: Less than one month

are you the property owner: owner of the property property type: semi detached looking for: double storey extension do you have planning permission: yes do you have plans drawn up: yes do you require...

Post a similar request >

05 Nov

House Extensions

Trowbridge - BA14

Enquiry from: Quentin M

Start Date: Immediate

I need an attic room to be refitted and divided into two, several wingdows moving or installing, a staircase moved, a bathroom refitted and a bedroom refurbished. Architech plans all available on requ...

Post a similar request >

05 Nov

House Extensions

Burnham-on-Sea - TA8

Enquiry from: Kathy W

Start Date: Immediate

Kitchen knocking in to back lounge and a new kitchen putting in

Post a similar request >

31 Oct

House Extensions

North Walsham - NR28

Enquiry from: Susan 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...

Post a similar request >

30 Oct

House Extensions

Coalville, Ibstock, Markfield - LE67

Enquiry from: Gary W

Start Date: Immediate

mr requested quotes for house extension from a builder around coalville, ibstock, markfield. they are considering a couple of projects at the moment.call anytime to arrange appointment to discuss. the...

Post a similar request >

30 Oct

House Extensions

Port Talbot - SA12

Enquiry from: Richard C

Start Date: Less than one month

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

Post a similar request >

29 Oct

House Extensions

Coalville, Ibstock, Markfield - LE67

Enquiry from: George T

Start Date: Immediate

Customer made an online enquiry for House Extension via one of our websites. Confirmed via . Please call to arrange an appointment to quote.

Post a similar request >

28 Oct

House Extensions

Tonbridge - TN10

Enquiry from: John C

Start Date: Less than one month

customer made an enquiry for house extension and confirmed on the local quotes site they would like quotes from a builder.mr lives in the tonbridge area and would like a call to discuss options.see be...

Post a similar request >

28 Oct

House Extensions

Haddington - EH41

Enquiry from: Graeme M

Start Date: Immediate

customer in the haddington area made an enquiry a couple of projects including house extension.call anytime and arrange an appointment to discuss. below is some details about this project: are you the...

Post a similar request >

28 Oct

House Extensions

Cambridge - CB3

Enquiry from: Mehdi N

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 Cambridge area Please call to arrange an appointment

Post a similar request >

27 Oct

House Extensions

Nottingham - NG2

Enquiry from: Oghosa O

Start Date: Immediate

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

Post a similar request >

21 Oct

House Extensions

London - SE26

Enquiry from: Ga R

Start Date: Immediate

Customer made an online enquiry for House Extension via one of our websites. Confirmed via . Please call to arrange an appointment to quote.

Post a similar request >

21 Oct

House Extensions

Tunbridge Wells - TN4

Enquiry from: Steve M

Start Date: Less than one month

looking for a ground floor 9mx3m extention and loft conversion customer is currently in the process of looking for quotes to add a single storey extension to their property. are you the property owne...

Post a similar request >

16 Oct

House Extensions

London - SE25

Enquiry from: Zack K

Start Date: Immediate

Ground floor wraparound extension

Post a similar request >

16 Oct

House Extensions

Lightwater - GU18

Enquiry from: ANTONY A

Start Date: Immediate

GROUND FLOOR EXTENSION, 16 SQUARE METRES, FLAT ROOF

Post a similar request >

16 Oct

House Extensions

Woking - GU21

Enquiry from: Matt J

Start Date: Immediate

3m x 9 m downstairs rear extension depending on budget, side extension and roof approx 2.5M x 9M

Post a similar request >

How it works

Tell us about your House extensions project

Answer a few quick questions, so we can match you with professionals who can help.

Find up to 4 Builders in your area

Get free, no-obligation quotes from 4 verified Builders working in your area.

Hire with confidence

Compare customer reviews, services and prices, and choose the right professional for you.