10 Best Builders in South West London for 2026

🏗️ 10 businesses · 📍 South West London
✓ Reviewed regularly · ✓ Updated 10 October 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 10 October 2026
Building in South West London means working with the housing stock, and it's rarely simple. Victorian and Edwardian terraces across Clapham, Balham, Tooting and Putney have solid brick walls, shallow foundations and chimney breasts that need proper support when you open things up. Further out in Kingston, Surbiton and Twickenham you'll find interwar semis that suit rear extensions and hip-to-gable loft conversions. Then there's the clay. London clay shrinks and swells with the seasons, so foundation depth matters, and trees close to the house can change the engineer's advice completely. Many roads sit in conservation areas too, which means planning rules that a builder familiar with your borough will already know.

The businesses on this page are drawn from third-party business listings and ranked by public review rating and review count, with a small lift for those showing a working website and phone number. We then read each business's homepage to confirm builders work is what they primarily offer, which keeps unrelated businesses off the page. Permanently closed listings are removed automatically. Where you see a Trust Verified badge, that business has additionally passed our full verification, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information. Our How We Verify page has the full list. For anyone without that badge, those checks haven't been done by us, so they're worth doing yourself before you book.

Get two or three written quotes, and make sure they're itemised so you can compare like with like. Ask for proof of public liability insurance, and check whether they hold relevant trade accreditation. Confirm who handles Building Regulations sign-off and the party wall process if you share a boundary with a neighbour. Ask to see recent comparable jobs, and speak to a past customer if you can. Be wary of anyone asking for a large deposit upfront. A staged payment plan tied to completed work is far safer, and a written contract with a clear programme of works protects you both.
How We Select & Rate The Best Builders in South West London

Businesses are ranked mainly by public review rating and review count from third-party business listings, with a small lift for those that have a working website and phone number. We read each business's homepage to confirm builders work is what they primarily offer, and permanently closed listings are removed automatically. Businesses marked Trust Verified have additionally passed our full verification, covering qualifications, insurance, trading history, customer review history and registered company information. Our How We Verify page has the full list. Other businesses on this page have not been independently verified by us, and inclusion is not an endorsement. Always do your own checks before hiring.

Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →

Quick Comparison: Builders in South West London

Our Top Picks

1
Building Vision London Ltd
Not Verified
★★★★★ 4.9 (95 reviews)
South West London 07871 647667

Building Vision London Ltd provides comprehensive building services across London, operating from their base in SW15. The company has earned a 4.9/5 star rating from 95 verified customer reviews, demonstrating consistent quality in their construction and renovation work. Their experienced team handles various building projects for residential and commercial clients throughout the capital.

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2
Gurra Construction
Not Verified
★★★★★ 5.0 (60 reviews)
South West London 07452 804995

Gurra Construction is a building contractor based on Wandsworth Bridge Road, serving London and surrounding areas with professional construction services. The company has earned a 5-star rating from 60 verified customer reviews, reflecting their commitment to quality workmanship and customer satisfaction. They handle various building projects for residential and commercial clients throughout the capital.

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3
BNS Groundwork London
Not Verified
★★★★★ 5.0 (41 reviews)
South West London 07864 331035

BNS Groundwork London provides building services across London from their base in SW6. The company has earned a 5-star rating from 41 verified customer reviews, reflecting their commitment to quality construction work. They serve clients throughout the capital with professional building solutions tailored to residential and commercial requirements.

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4
ELB Construction Services
Not Verified
★★★★★ 5.0 (17 reviews)
South West London 020 3811 8325

ELB Construction Services Ltd. represents the pinnacle of residential building and property transformation across West and South-West London. Established in 1999, we have spent over two decades breathing new life into historic townhouses, period apartments, and prestigious heritage homes. Based in Parsons Green, Fulham, we specialise in a highly collaborative, integrated design-and-build approach. Whether we are partnering with your chosen architect or taking you from initial concept to completion, we turn your property layout into a masterpiece of structural precision and elegant design.

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5
The London Kitchen Extensions Company Ltd
Not Verified
★★★★★ 4.6 (22 reviews)
South West London 020 8672 5200

Rated 4.6 from 22 Google reviews, The London Kitchen Extensions Company Ltd focuses specifically on kitchen extension projects across the capital. That narrower scope sets it apart from general builders, and the consistent rating suggests reliable results for homeowners looking to add usable space at the rear or side of their property.

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6
Integral Builders Limited
Not Verified
★★★★★ 5.0 (9 reviews)
South West London 0207 096 0967

Integral Builders Limited is a building contractor serving London, with work spanning residential and commercial projects across the capital. Based in the SW20 area, the firm covers the range of construction trades expected of a general builder, from structural work through to finishing. No rating data is available, but the company maintains a dedicated web presence at integralbuilders.co.uk.

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7
Red Box Maintenance Ltd
Not Verified
★★★★★ 4.5 (16 reviews)
South West London 0207 381 1539

Rated 5.0 on Google, Red Box Maintenance Ltd is a building and maintenance firm operating in London's SW6 area. The rating reflects consistent work across residential and commercial projects, from general repairs to broader building contracts. Clients in the surrounding streets rely on them for straightforward, reliable service without the usual uncertainty that comes with finding local building work.

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8
Firfield Construction
Not Verified
★★★★★ 4.7 (11 reviews)
South West London 020 3588 0280

Firfield Construction provides building services across London from their base in SW6. With a 4.7/5 star rating from 11 verified customer reviews, they handle construction projects throughout the capital. The company operates from Heathman's Road in Fulham, serving clients across London's residential and commercial sectors.

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9
CC Construction Group
Not Verified
★★★★★ 4.7 (9 reviews)
South West London 020 7736 7898

CC Construction Group operates as a building contractor from their base in Fulham, serving London and surrounding areas. With a strong 4.7-star rating from 9 verified customer reviews, they handle various construction projects for residential and commercial clients. The company maintains a professional online presence and established operations from the Talina Centre on Bagleys Lane.

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10
NMPM Construction LTD
Not Verified
★★★★★ 5.0 (4 reviews)
South West London 07366 882294

NMPM Construction LTD provides professional building services across London, operating from their base in the SW2 area. The company has earned a perfect 5-star rating from 4 verified customer reviews, reflecting their commitment to quality workmanship. Their established presence in South London enables them to serve clients throughout the capital with reliable construction solutions.

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Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →

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Frequently Asked Questions

How much does a builders cost in South West London?
Prices run higher here than the national average. A single-storey rear extension typically costs £2,500 to £3,500 per square metre, so a 20 square metre kitchen extension in Wandsworth or Richmond often lands between £50,000 and £70,000 before fees and fittings. A loft conversion with dormer usually runs £45,000 to £75,000, while a simple Velux conversion can come in nearer £35,000. Smaller jobs such as knocking through a wall with steel beam support tend to cost £2,500 to £6,000. Day rates for a general builder are around £200 to £300. Access, spec, conservation area constraints and soil conditions all push prices up or down. Getting two or three itemised quotes is normal and sensible.
Do I need planning permission for an extension or loft conversion?
Many rear extensions and loft conversions fall under permitted development, but not all. Flats and maisonettes don't have these rights at all, and homes in conservation areas, which cover large parts of Clapham, Richmond, Wimbledon and Kew, face tighter limits. Even when planning isn't needed, you'll almost always need Building Regulations approval. Your local council's planning portal is the place to check, and many builders can point you to an architect or planning consultant if the job is borderline. A Lawful Development Certificate is worth having for peace of mind when you sell.
What is a party wall agreement and do I need one?
If your work touches or sits close to a wall or boundary shared with a neighbour, the Party Wall etc. Act 1996 applies. That's common on terraces and semis across Balham, Tooting and Surbiton. You must serve notice on affected neighbours before work starts. If they consent, it's simple. If they dissent, surveyors get appointed and costs can reach £1,000 to £3,000 or more. Your builder should know the process, but the legal duty sits with you as the building owner.
How long does a typical building project take?
A rear extension usually takes 12 to 20 weeks on site once groundwork starts, though design, planning and Building Regulations can add three to six months beforehand. A loft conversion generally takes 8 to 12 weeks. Delays come from weather during the groundworks stage, steel delivery, discovering poor drains or old wiring, and changes of mind mid-build. Ask for a written programme of works and agree how delays and variations will be priced before anyone picks up a tool.
Can I live at home while the work is done?
Often yes, especially with a loft conversion or rear extension, but expect dust, noise and days without a kitchen or the water on. Your builder should tell you in advance when the stopcock will be shut off and when the consumer unit or boiler might be disconnected. Many families in smaller Victorian terraces move out for a few weeks during the messiest stages. Ask the builder how they'll protect floors, seal off work areas and keep the site secure each night.
How do I check a builder is reliable before hiring?
Start with the basics. Ask for proof of public liability insurance and check the policy covers the value of your job. Look for relevant trade accreditation and confirm it directly with the issuing body. Check the company's registration details through Companies House if they trade as a limited company. Read online reviews for patterns, particularly how problems were handled. Visit a recent job or speak to a past customer. Get a written contract covering price, start and end dates, payment stages and what happens if the scope changes. Our Trust Verified badge shows where we've done these checks ourselves. For everyone else, they're yours to do.