Find affordable London extension builders
- Local extension builders London
- Job estimates from extension builders near you
- Compare London extension builders rates
| Low | Average | High |
|---|---|---|
| £3 | £37 | £200 |
| Average hourly rate from 3289 extension builders in London ex VAT or callout | ||
Average London extension builder hourly rate is £45
Range from the cheapest, mostly independent, £27 per hour and £230 per day (CC&D BUILDING LTD) to the dearest, normally the best, £100 per hour and £400 per day (Imq).
Comparing hourly and daily rates of extension builders gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Click 'Get quotes' and describe your job and we will send it to your local extension builders for FREE.
Local extension builders London
GR MAINTENANCE LTD
£37/hour
£236/day
Member since April 2025
Trusted and professional extension builder in London. Experienced in all work and keeping within budget and on quote. GR MAINTENANCE LTD have many happy customers in London, testimonials available.
"Extension single room "
KT9
Can design and Construction
£37/hour
£235/day
Member since August 2025
Can design and Construction are extension builders in London who work within a 10 mile radius. Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of work in London and testimonials.
"Single storey extension"
COULSDON
Banga Decoration
£80/hour
£400/day
Member since August 2025
Extension Builder in Thornton Heath &croy, CR7. Working within a 10 mile radius.
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the customer Banga decoration he as got a very good reputation and loyal to the customers Banga decorat...
Areas Covered - Bangadecorationandgeneralbuilding Ltd Cover all erea of london south including Kent erea .
"Loft conversion"
EALING
Bspec Ltd
£80/hour
£260/day
Extension Builder in Clapton London, E5. Working within a 5 mile radius.
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.
We have the knowledge and experience to provide a comprehensive plumbing service.
..."For garden extention "
SM5
Powerpillar Ltd
£37/hour
£232/day
Extension Builder in London, E3.
Need an Extension Builder in London? Powerpillar Ltd has been helping local clients (5 mile radius) with their jobs for many years. Get a quote today.
"Loft conversion"
HIMANSHU, EN5
Amberly Builders
£37/hour
£230/day
Amberly Builders are extension builders in London who work within a 10 mile radius. Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of work in London and testimonials.
"Loft conversion quote"
HIMANSHU, EN5
Bud construction ltd
£37/hour
£236/day
Extension Builder in London, HA8.
Need an Extension Builder in London? Bud construction ltd has been helping local clients (20 mile radius) with their jobs for many years. Get a quote today.
"Basement conversion"
SE18
The Home Refurbishment Company
£39/hour
£243/day
Extension Builder in Hammersmith Greater London, W6. Working within a 5 mile radius.
Welcome to “The Home Refurbishment Company”THRC Construction!We are a full-service construction company dedicated to providing exceptional quality and value on all of our projects. At Our Construction Company, we believe that quality work shou...
"Outbuilding"
IG5
F & F Building Services
£37/hour
£235/day
Extension Builder in London, SW1P. Working within a 20 mile radius.
F & F Building Services is an established business in London. We come highly recommended and provide competitive quotes for your work.
"Kitchen extension"
UB6
JK Doors
£37/hour
£236/day
Extension Builder in London, W1W. Covering 20 mile radius.
JK Doors is a trusted Extension Builder serving customers in London and the surrounding area. Contact us to today to get a competitive quote for work in London. We offer value for money and quality to our customers, we pride ourselves on the positive feedback.
"Two storey extension"
KONRAD, WD3
CC&D BUILDING LTD
£27/hour
£270/day
Extension Builder in London, E7 covering a 5 mile radius.
Experienced Extension Builder ready to quote for your work. CC&D BUILDING LTD is the best Extension Builder in London. No obligation free quotes and many happy customers.
"Loft conversion"
SOPHIE-RHEMA, WD19
Gigi's Builder Limited
£36/hour
£231/day
Trusted and professional extension builder in London. Experienced in all work and keeping within budget and on quote. Gigi's Builder Limited have many happy customers in London, testimonials available.
"Basement conversion"
TW2
Home Tranformers Ltd
£39/hour
£243/day
Extension Builder in London, SE1. Working within a 5 mile radius.
At Home Tranformers Ltd we have been fitting bespoke bathrooms for over 10 years. We pride ourselves on being the go-to bathroom fitters for discerning customers in the South-East London.It is a well-known fact that bathrooms sell houses. ...
"Build a brick outbuilding, 24ft by 14ft including folding doors. Usage is for gym and office."
RAMESH, KT5
Imq
£100/hour
£350/day
Extension Builder in London, CR2. Covering 10 mile radius.
Imq is a trusted Extension Builder serving customers in London and the surrounding area. Contact us to today to get a competitive quote for work in London. We offer value for money and quality to our customers, we pride ourselves on the positive feedback.
"1st floor Timber frame extension 28m2 "
ALEXANDRA, SE9
A K Decoration & Building Serv
£37/hour
£233/day
Extension Builder in London, N22.
Need an Extension Builder in London? A K Decoration & Building Serv has been helping local clients (5 mile radius) with their jobs for many years. Get a quote today.
"I am seeking an estimate for a loft conversion. This should include structural design. Hip to gable dormer, with a toilet and sink."
SALEEM, UB5
EB
£37/hour
£236/day
Relax... you have found a reliable extension builder in London. EB is a friendly and reliable company based in London who consider no job as too big or too small. Qualified, professional extension builders with years of experience in the industry.
"Single storey extension"
GEORGE, SW18
Adrian Noonan Ltd
£37/hour
£236/day
Extension Builder in London, NW5. Working within a 5 mile radius.
please call to discuss your building needs.
"Side return extension 12smq roughly Open up wall to garden and install big door window Demolish lean-to and original victorian toilet"
ALESSANDRA, E10
Pavillion Building Services
£37/hour
£236/day
Relax... you have found a reliable extension builder in London. Pavillion Building Services is a friendly and reliable company based in London who consider no job as too big or too small. Qualified, professional extension builders with years of experience in the industry.
"Garden office"
WOOLWICH
Homeworks Design & Build Ltd
£60/hour
£250/day
Homeworks Design & Build Ltd are extension builders in London who work within a 5 mile radius. Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of work in London and testimonials.
"I down loft extension, garage all house renovation, driveway many other "
DAVINDER, SL3
VAF Ltd
£40/hour
£300/day
Extension Builder in Hornchurch, RM12. Working within a 10 mile radius.
VAF LTD are experts in domestic and commercial joinery, building and contracting. We have a long tradition of producing quality building services. Verified in fire door installation. We offer a variety of carpentry and joinery s...
"Outbuilding"
SUNIL, HA4
Quickly find an Extension Builder in London
Use these steps to find Extension Builders in London for FREE!
- Post your job: Click "Get quotes" and briefly describe your job.
- Enter your details: We’ll match you with Extension Builders in London. We’ll notify you via text or email when an Extension Builder is available to quote.
- Select your Extension Builder: Compare Extension Builders interested in working with you. You can use HaMuch to safely message local London Extension Builders or phone them directly - you’re in control!
The most important thing is do avoid handing over cash or paying large sums in advance. Be wary of paying cash for a cheaper job, i.e. to avoid VAT, you may be going down a slippery slope of not doing things properly which may eventually mean your job is also not done properly.
Agree when you intend to pay, ideally after you are satisfied with the completed job. If it is a big job agree a schedule of staged payments which is fair to both parties.
To avoid bad tradespeople and to ensure you can find them should they not answer a mobile;
- Get proper contact details and check them yourself
- Check if the company is verified on the Companies House website
- Get phone details, ideally a land line or 0800 number and check it
- Get a physical office address
Get quotes in writing by email or in person if possible. Getting quotes online or by text is ok (make sure you accept the offer by replying). For large projects make a written agreement, schedule of works and snagging plans as part of a working document. Also;
- Agree expected quality of workmanship and materials in advance
- When will work start and when will project be finished, what happens if project over runs ?
- How long is the guarantee on work and materials eg 12 months
- Discuss onsite behaviour in advance (no smoking, swearing or using mobile phones for non-work purposes)
- Agree that your Extension Builder will remove all debris and rubbish and what level of tidying up you want after job
Compare London extension builders rates
Job estimates from extension builders near you
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.
Timber frame extension - £25,888
Garden office - £9,888
Granny annexe - £86,888
Flat roof extension - £21,888
Garage conversion - £15,888
Hip to gable loft conversion - £41,888
Bungalow loft conversion - £28,888
Dormer loft conversion - £41,888
Swimming pool - £80,888
Mansard loft conversion - £51,888
Concrete foundation - £6,138
Underpinning - £17,388
Two storey extension - £87,832
Basement conversion - £36,240
Side return extension - £40,240
Loft conversion - £32,700
Garage - £18,388
Single storey extension - £52,760
Outbuilding - £9,888
RSJ installation - £2,088
Kitchen extension - £41,888
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