London Connection1The Ledger Building
- Details
- Outdoor seating
- Address
- Ledger Building, 4 Hertsmere Road, London, E14 4AL
- Phone
- +44 20 7536 7770
- Website
- jdwetherspoon.com
- Opening hours
- Mon-Thu,Sun 09:00-00:00 · Fri-Sat 09:00-01:00
Best Builders in London
Builders in London carry out extensions, loft conversions, refurbishments, kitchens, bathrooms and general repairs. Below you will find our selection of 10 builders in London, with address, phone number, website and opening hours for each one, followed by practical advice on choosing the right builder, typical prices and answers to common questions.
10listed
10with phone number
10with website
2open on Sundays
10 Builders in London
2Barnes Contractors UK LLP
- Address
- The Old School House, 66-70 Bourne Rd, Bexley DA5 1LU
- Phone
- +44 1322 523503
- Website
- barnes-contractors.co.uk
- Opening hours
- Mon–Thu 7 AM-4:30 PM · Fri 7 AM-4 PM · Sat 7:30 AM-12:30 PM · Sun Closed
3F & H Building Contractors
- Address
- 17 Deniston Ave, Bexley DA5 3HL
- Phone
- +44 20 8302 1000
- Website
- fandhbuildingcontractors.com
- Opening hours
- Mon–Fri 8 AM-5 PM · Sat 9 AM-1 PM · Sun Closed
4Tomson Construction
- Address
- 75 Colney Hatch Lane, London, N10 1LR
- Phone
- +44 20 8261 7573
- Website
- tomsonconstruction.co.uk
- Opening hours
- Mon-Sat 08:00-17:00
5Renovations Team Ltd
- Address
- 517 Old York Road, London, SW18 1TF
- Phone
- +44 20 8687 1919
- Website
- renovationsteam.co.uk
- Opening hours
- Mon-Fri 08:00-17:00
6Builders Arms
- Address
- 1 Kensington Court Place, London, W8 5BJ
- Phone
- +44 20 7937 6213
- Website
- thebuildersarmskensington.co.uk
- Opening hours
- Mon-Sat 11:00-23:00 · Sun 12:00-22:30
7B.E.L. Group
- Address
- 127 Eastern Avenue, London
- Phone
- +44 207 315 4049
- Website
- belgroup.co.uk
- Opening hours
- Mon-Sat 09:00-19:00 · Sun closed
8New City College, Rainham Construction and Engineering Campus
- Details
- Independent / fee-paying
- Address
- New Road, London, RM13 8GP
- Phone
- +44 330 135 9000
- Website
- ncclondon.ac.uk
9Dulwich Village Church of England Infants' School (Lake Building)
- Address
- Dulwich Village, London, SE21 7BU
- Phone
- +44 20 7525 9233
- Website
- dulwichvillageinfants.co.uk
10Regent Land & Developments
- Address
- 266 Selsdon Road, London, CR2 7AA
- Phone
- +44 20 8680 3530
- Website
- regentland.co.uk
How to choose a builder in London
- Check planning permission and Building Regulations requirements before work starts.
- Get at least three detailed, itemised quotes.
- Look for membership of the Federation of Master Builders (FMB) or TrustMark.
- Agree a written contract with stage payments; never pay the full amount upfront.
Checks and regulation: Most structural work needs Building Regulations approval; work on shared walls may need a Party Wall agreement.
How much does a builder cost in London?
Single-storey rear extensions in London typically cost £2,500–£3,500 per m²; loft conversions £50,000–£90,000. Prices vary by area, time of day and the complexity of the job or service, so always ask for a written quote or check the latest price list before you book.
Builders across London
London is made up of 32 boroughs plus the City of London. The builders above are spread across the capital; use the borough guides below to find options closer to home.
Builders by borough
- Builders in Barnet
- Builders in Bexley
- Builders in Croydon
- Builders in Merton
- Builders in Redbridge
- Builders in Richmond upon Thames
- Builders in Sutton
- Builders in Westminster
Frequently asked questions
Do I need planning permission for an extension in London?
Many rear extensions fall under permitted development, but conservation areas and flats have stricter rules. Check with London council.
How long does an extension take?
A single-storey rear extension usually takes 10–16 weeks once work starts.
What is a Party Wall agreement?
If you build on or near a shared wall, you must give your neighbours notice under the Party Wall etc. Act 1996.
Listings are compiled from public business information and OpenStreetMap (© OpenStreetMap contributors, ODbL). Details can change, so please confirm opening hours and prices with the business before visiting. Businesses can request corrections via our contact page. Last reviewed: September 2026.