Find affordable Merton extension builders
- Local extension builders Merton
- Job estimates from extension builders near you
- Local Extension Builders in London Boroughs
| Low | Average | High |
|---|---|---|
| £15 | £38 | £100 |
| Average hourly rate from 215 extension builders in Merton ex VAT or callout | ||
Average Merton extension builder hourly rate is £38
Range from the cheapest, mostly independent, £20 per hour and £160 per day (RBB Building Ltd) 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 Merton
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 .
"For garden extention "
SM5
H BUILDING SERVICES LTD
Merton CR4
£37/hour
£233/day
Extension Builder in Merton, CR4. Working within a 10 mile radius.
H BUILDING SERVICES LTD is an established business in Merton. We come highly recommended and provide competitive quotes for your work.
" **St George's Hospital Toilets & Washrooms Refurbishment – £450K Opportunity** St George’s University Hospitals NHS Foundation Trust invites bids for the refurbishment of toilets and washrooms at St George’s Hospital, Tooting (SW17 0QT). Total contract value is £450,000. Project runs from..."
JAMES, SW17
PAL CONSTRUCTION
£37/hour
£233/day
Extension Builder in Merton, CR4.
Need an Extension Builder in Merton? PAL CONSTRUCTION has been helping local clients (10 mile radius) with their jobs for many years. Get a quote today.
"Flat roof extension"
CR44
AS Builder London Ltd
Merton Mitcham CR4
£36/hour
£229/day
Extension Builder in Merton, CR4. Covering 10 mile radius.
AS Builder London Ltd is a trusted Extension Builder serving customers in Merton and the surrounding area. Contact us to today to get a competitive quote for work in Merton. We offer value for money and quality to our customers, we pride ourselves on the positive feedback.
"Loft conversion- 2 beds and a bathroom"
SAUD, SW17
A A CONSTRUCTION LONDON LTD
£37/hour
£233/day
Extension Builder in Merton, CR4. Working within a 10 mile radius.
A A CONSTRUCTION LONDON LTD is an established business in Merton. We come highly recommended and provide competitive quotes for your work.
"Side return extension"
CR4
K&M BUILDING CONSTRUCTION
Merton CR4
£30/hour
£250/day
K&M BUILDING CONSTRUCTION are here to help customers who need an Extension Builder in Merton. We offer a competitive rate to complete all your jobs to professional standards.
PregoBuild
£37/hour
£233/day
Extension Builder in Merton, CR4. Covering 10 mile radius.
PregoBuild is a trusted Extension Builder serving customers in Merton and the surrounding area. Contact us to today to get a competitive quote for work in Merton. We offer value for money and quality to our customers, we pride ourselves on the positive feedback.
AFTRAD BUILDING SERVICES
Merton CR4
£37/hour
£233/day
Extension Builder in Merton, CR4. Covering 10 mile radius.
AFTRAD BUILDING SERVICES is a trusted Extension Builder serving customers in Merton and the surrounding area. Contact us to today to get a competitive quote for work in Merton. We offer value for money and quality to our customers, we pride ourselves on the positive feedback.
BUILD WORLD LTD
£37/hour
£233/day
BUILD WORLD LTD are extension builders in Merton 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 Merton and testimonials.
RBB Building Ltd
Merton Mitcham Rbbelectrics CR4
£20/hour
£160/day
Extension Builder in Merton Mitcham Rbbelectrics, CR4. Working within a 10 mile radius.
25 years experience in electrical work
Time keeping
Honest and Reasonable price
Free Quotation
ADF BUILDING
£37/hour
£232/day
Extension Builder in Merton, CR4 covering a 10 mile radius.
Experienced Extension Builder ready to quote for your work. ADF BUILDING is the best Extension Builder in Merton. No obligation free quotes and many happy customers.
L & C Construction Ltd
Merton CR4
£37/hour
£233/day
L & C Construction Ltd are here to help customers who need an Extension Builder in Merton. We offer a competitive rate to complete all your jobs to professional standards.
Porters Development Ltd
£22/hour
£180/day
Extension Builder in London, CR4. Working within a 10 mile radius.
Porters Development London helps all house owners to bring their loving homes to perfection in professional and caring way for last 30 years.
Based in London and focused on managing good relationship with the client instead of finances ...
Quality Builders
Merton Mitcham CR4
£39/hour
£242/day
Extension Builder in Merton Mitcham, CR4. Working within a 10 mile radius.
Simion 07576828989Artur 07533759859Our building services company Quality Builders has 15 years’ experience in the industry. We have been helping customers in Mitcham, Croydon, Purley, Coulsdon, Carshalton, Wallington, Morden, Epsom and S...
NERO BUILDING WORK LTD
£39/hour
£219/day
Extension Builder in Merton, CR4. Working within a 10 mile radius.
If you are looking for a Merton Extension Builder and you need something replaced, fitted, or fixed, contact NERO BUILDING WORK LTD today. We are competitively priced and recommended by Merton customers for all work.
Triada Building LTD
Merton Londonderry CR4
£39/hour
£243/day
Extension Builder in Merton Londonderry, CR4. Working within a 10 mile radius.
London's specialists in Extensions/ Loft Conversions/ Renovations/ New Builds/ Structural Works/ General Building Work
MATCO Design & Build
£39/hour
£243/day
Extension Builder in Surrey, CR4. Working within a 10 mile radius.
We are a family run business based in south west London providing high quality construction services for many years. Matco developers has over 20 years’ experience in residential and commercial sector, now extending our services even further and...
Edlin Homes
Merton London CR4
£39/hour
£243/day
Relax... you have found a reliable extension builder in Merton. Edlin Homes is a friendly and reliable company based in Merton who consider no job as too big or too small. Qualified, professional extension builders with years of experience in the industry.
PROBUILDER
£37/hour
£233/day
Extension Builder in Merton, SW16. Covering 5 mile radius.
PROBUILDER is a trusted Extension Builder serving customers in Merton and the surrounding area. Contact us to today to get a competitive quote for work in Merton. We offer value for money and quality to our customers, we pride ourselves on the positive feedback.
LMC Developments
Merton Greater London CR4
£39/hour
£243/day
Extension Builder in Merton Greater London, CR4. Working within a 10 mile radius.
We take pride in our work and focus on creating living spaces that enhance your life for the better. We believe that every inch of your future dream should be well designed and planned with confidence. We can make your vision of how you want to li...
Quickly find an Extension Builder in Merton
Use these steps to find Extension Builders in Merton for FREE!
- Post your job: Click "Get quotes" and briefly describe your job.
- Enter your details: We’ll match you with Extension Builders in Merton. 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 Merton 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
Local Extension Builders in London Boroughs
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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