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 £40
Range from the cheapest, mostly independent, £25 per hour and £225 per day (L A CONSTRUCTION LIMITED) to the dearest, normally the best, £80 per hour and £400 per day (Banga Decoration).
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
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 .
"Extension single room "
KT9
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.
"Single storey extension"
COULSDON
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.
"Loft conversion"
EALING
Eagle Building Experts Ltd
£55/hour
£236/day
Eagle Building Experts Ltd are here to help customers who need an Extension Builder in London. We offer a competitive rate to complete all your jobs to professional standards.
"For garden extention "
SM5
Samuele Paolini
£38/hour
£237/day
Extension Builder in London, NW2.
Need an Extension Builder in London? Samuele Paolini has been helping local clients (5 mile radius) with their jobs for many years. Get a quote today.
"Loft conversion"
HIMANSHU, EN5
PT DECORATIONS LTD
£37/hour
£236/day
Trusted and professional extension builder in London. Experienced in all work and keeping within budget and on quote. PT DECORATIONS LTD have many happy customers in London, testimonials available.
"Loft conversion quote"
HIMANSHU, EN5
JJSR Construction Ltd
£37/hour
£236/day
JJSR Construction Ltd is an established and experienced local extension builder in London. Please contact us for a free, no obligation quote and competitive rates. Covering a 10 mile radius.
"Basement conversion"
SE18
T M Builder
£37/hour
£233/day
T M Builder 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.
"Outbuilding"
IG5
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.
"Kitchen extension"
UB6
Cre8tive Contractors Ltd
£37/hour
£235/day
Cre8tive Contractors Ltd are here to help customers who need an Extension Builder in London. We offer a competitive rate to complete all your jobs to professional standards.
"Two storey extension"
KONRAD, WD3
Past and present
£37/hour
£235/day
Extension Builder in London, CR0. Covering 20 mile radius.
Past and present 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.
"Loft conversion"
SOPHIE-RHEMA, WD19
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.
"Basement conversion"
TW2
DANIEL BUILDING SOLUTIONS LTD
£37/hour
£234/day
Trusted and professional extension builder in London. Experienced in all work and keeping within budget and on quote. DANIEL BUILDING SOLUTIONS LTD have many happy customers in London, testimonials available.
"Build a brick outbuilding, 24ft by 14ft including folding doors. Usage is for gym and office."
RAMESH, KT5
Guven Buildings LTD
£38/hour
£270/day
Extension Builder in Chigwell, IG7. Working within a 10 mile radius.
skilled worker who specializes in completing a wide range of building and renovation projects
Areas Covered - N1-N22 E4-E20 W1-W11 SW1-SW20 IG1-IG11 NW1-NW11 RM1-RM14 EN1-EN8
"1st floor Timber frame extension 28m2 "
ALEXANDRA, SE9
Torrington
£37/hour
£236/day
Extension Builder in london, EC2A. Working within a 5 mile radius.
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to discerning clientele with a wide variety of designs. We offer reliable emergency cover for gas, plumbin...
Areas Covered - London in around m25
"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
Bandesha Builders Limited
£40/hour
£350/day
Extension Builder in Slough, SL2. Working within a 20 mile radius.
Hi, I'm Mantej Singh. I'm doing domestic building work. I'm starting before 7 years ago and now I've my own company, we undertake all sorts of household refurbishment from roofing, extention, New build, driveway, Painting & Decorating, Kichen & Ba...
Areas Covered - Slough
"Single storey extension"
GEORGE, SW18
RR'S Builders
£35/hour
£250/day
Trusted and professional extension builder in London. Experienced in all work and keeping within budget and on quote. RR'S Builders have many happy customers in London, testimonials available.
"Side return extension 12smq roughly Open up wall to garden and install big door window Demolish lean-to and original victorian toilet"
ALESSANDRA, E10
J&S WALLINGTON LIMITED
£39/hour
£242/day
Extension Builder in Catford Greater London, SE6. Working within a 5 mile radius.
We provide our clients with excellent service and quality. Whether you are looking to extend or upgrade, our professional team has the skills and experience to deliver exceptional service. J&S Wallington Ltd often plays the role of the main contra...
"Garden office"
WOOLWICH
L A CONSTRUCTION LIMITED
£25/hour
£225/day
L A CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in London. We offer a competitive rate to complete all your jobs to professional standards.
"I down loft extension, garage all house renovation, driveway many other "
DAVINDER, SL3
Greens Gardening & Landscape Property Maintenance
£37/hour
£235/day
Extension Builder in Crystal Palace London, SE19. Working within a 5 mile radius.
Watch our short video highlighting all our expertise and services here:
more than 10 years’ experience in the trade the landscape gardeners at Greens Gardening & Landscape Prop...
"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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