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.
Average House extensions cost
The regular cost of House extensions are £54,563 in your area. Costs vary based upon the materials and the company picked. The upper price range can be as high as £80,063. The material costs are in most cases around£10,500.
Average price per House extensions job in 2026
| Avg. price low | Avg. price low |
|---|---|
| Avg. price | Avg. price |
| Avg. price high | Avg. price high |
£80600
£60450
£40300
£20150
£0
House extensions installation cost in your area 2026
| Labour cost | £27,000 | |
| Material cost | £10,500 | |
| Waste removal | £2,500 |
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
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.
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.
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.
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 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.
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.
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.
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 Local Quotes it's a big part of my …
Love Local Quotes it's a big part of my Business I would recommend to anyone
Latest house extensions reviews
Dream the Build
Based: in London, EC1VDREAM the Build. Ltd ' Constructing your Vision
Making home development exciting, fun and asse...
Dream the Build reviews
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, UB4Hi Jassi Builders LTD here, I am a specialist in planning, designing and building control services. ...
Jassi Builders reviews
Julian F., HP2
25th February 2022
House Extensions in Hemel Hempstead
No quote received
B&G Carpentry
Based: in Newhaven, BN9B&G Carpentry is based in Newhaven and have 5 positive reviews
B&G Carpentry reviews
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, KT12Castell Home Improvements is based in Walton-on-thames and have 2 positive reviews
Castell Home Improvements reviews
Pravin S., SM5
25th January 2018
House Extensions in Carshalton
Not had any discussion one Cost so far
OJS Building
Based: in Surrey, KT17OJS Building are a local building firm based in Epsom and offering services to domestic and commerci...
OJS Building reviews
Abby E., BN7
14th July 2017
House Extensions in Lewes
Quick home visit and quote
Omega Lifestyle
Based: in Peterborough, PE7Omega Lifestyle prides itself on providing a high quality of customer service from the initial order...
Omega Lifestyle reviews
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, SO14MTL Contractors is based in Southampton and have 2 positive reviews
MTL Contractors reviews
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, BR1From past fifteen years we have been established as the finest building and construction service pro...
Nicholas James Construction reviews
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, KY14Scotbuild Group is based in Fife and have 7 positive reviews
Scotbuild Group reviews
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, ME8Here at Options Home Improvements we specialize is the bespoke design & installation of PVCu & Alumi...
Options Home Improvements reviews
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
Jassi Builders Ltd
Based: in Hayes, UB4 9YDHi 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...
Dream the Build
Based: in London, EC1V 2NXDREAM 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...
Options Home Improvements LTD
Based: in Kent, ME8 0DBHere 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
Based: in London, NW3 6DXBlue 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
Based: in Fife, KY14 7AUScotbuild Group LTD based in Fife, offer services in Extensions & Conversions. They have an average rating of 5 from 7 reviews. See their latest 5 star review below
Build Junky
Based: in Doncaster, DN9 1ALWe 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
Based: in Glasgow, G61 3NUThe 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
Based: in Bromley, BR1 3AXFrom 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
Based: in Appley bridge, WN6 9DBMagnus Technical Engineering LTD based in Appley bridge, offer services in Extensions & Conversions. They have an average rating of 5 from 6 reviews. See their latest 5 star review below
Tectra Partnership Ltd
Based: in Slough, SL3 0JETectra Partnership Ltd based in Slough, offer services in Extensions & Conversions. They have an average rating of 5 from 1 review. See their latest 5 star review below
Similar Customer Enquiries for House extensions
House Extensions
Luton - LU3
Enquiry from: Saadia K
Start Date: Immediate
2 bedrooms and 1 washroom in loft . Kitchen in ground floor
House Extensions
Glasgow - G65
Enquiry from: Gordon L
Start Date: Immediate
mr requested quotes for house extension from a builder around glasgow. they are considering a couple of projects at the moment.call anytime to arrange appointment to discuss. the information below is ...
House Extensions
Bath - BA1
Enquiry from: Daniel B
Start Date: Immediate
kitchen extension and convert boiler room as toilet and provide new combi boiler to kitchen
House Extensions
Telford - TF3
Enquiry from: Joseph O
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...
House Extensions
Hull - HU10
Enquiry from: Cheryl Y
Start Date: Immediate
Double story extentipn to the rear of the property. Approx 100m2 in total. Demolition of two conservatory at rear and replace adding bifolds and an extra bedroom and en-suite.
House Extensions
Bath - BA1
Enquiry from: Daniel B
Start Date: Immediate
single storey kitchen extension and a toilet are you the property owner: owner of the property property type: semi detached looking for: single storey extension do you have planning permission: yes do...
House Extensions
London - E7
Enquiry from: Mujibur O
Start Date: Less than one month
customer requested quotes for house extension from a builder around london. they are considering a couple of projects at the moment.call anytime to arrange appointment to discuss. the information belo...
House Extensions
Paignton - TQ3
Enquiry from: Stevie Y
Start Date: Immediate
customer in paignton areas is looking to do a couple of projects at the moment, and would like quotes for house extension.confirmed interest via sms and email at 12/04/2026 08:22.please call to arrang...
House Extensions
Sunderland - SR2
Enquiry from: Peter O
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 sunderland area and would like a call to discuss options.see b...
House Extensions
Nottingham - NG8
Enquiry from: Yasmin G
Start Date: Immediate
looking for a 2 story extension
House Extensions
Worksop - S80
Enquiry from: Faiz S
Start Date: Immediate
customer in worksop areas is looking to do a couple of projects at the moment, and would like quotes for house extension.confirmed interest via sms and email at 29/03/2026 23:57.please call to arrange...
House Extensions
London - SE19
Enquiry from: Natasha D
Start Date: Immediate
Customer in London area made an enquiry for House Extension online. Confirmed via SMS at 12:58 Please call to arrange an appointment to discuss options
House Extensions
Northampton - NN5
Enquiry from: Gowthami K
Start Date: Immediate
Project details: Kitchen refresh or basic replacement Install a small internal window on an existing wall Create a new internal door through existing wall in kitchen Extend existing bathroom into ...
House Extensions
Deal - CT14
Enquiry from: Thinu S
Start Date: Immediate
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...
House Extensions
Ashby-de-la-Zouch - LE65
Enquiry from: Eleta C
Start Date: Immediate
customer in ashby-de-la-zouch areas is looking to do a couple of projects at the moment, and would like quotes for house extension.confirmed interest via sms and email at 09/03/2026 18:16.please call ...
House Extensions
Bradford - BD8
Enquiry from: Sabeela B
Start Date: Immediate
customer in bradford area has requested that we arrange quotes for their house extension project.miss are considering various options and would like to discuss with a builder directly.please call to d...
House Extensions
Northampton - NN4
Enquiry from: Christine L
Start Date: Immediate
take off the conservatory to extend kitchen to it
House Extensions
Cardiff - CF10
Enquiry from: Reuben M
Start Date: Immediate
How much it cost for house extension
House Extensions
Blackpool - FY3
Enquiry from: Paul D
Start Date: Immediate
Loft conversion. New roof. Stairs installation
House Extensions
Stroud - GL5
Enquiry from: Matthew S
Start Date: 1 to 3 months
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 stroud area and would like a call to discuss options.see below...
Local & reliable builders near me
Tell us about your house extensions project
Answer a few quick questions, so we can match you with local builders who can help.
Find up to 4 builders in your area
Get free, no-obligation local house extensions quotes from 4 verified builders working in your area.
Hire with confidence
Compare customer reviews, services and prices, and choose the right tradesperson for you.