5 Best General Contractor Firms in London (2026)

Independently ranked by our review of ratings, reviews and reputation · How we chose

By Brad Smith, Home Services Expert · ✓ Data verified August 2026 · 7 min read

Renovating a London house usually means trusting one general contractor firm with your home for months, not days, and every name on this page currently holds a perfect or near-perfect Google rating. What separates them is scale and specialism: review counts run from 34 up to 92, and the work itself ranges from a full Victorian refurbishment to underpinning a basement that two other companies turned down.

Short answer: Row London Construction Ltd tops general contracting in London with a 5.0 rating across 92 reviews, covering full bathroom and kitchen renovations. London Construction Company and SX Basement Construction London stand out for full refurbishments and basement conversions respectively, with reviewers describing project timelines running from a few weeks to six months for a full house refurb.

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1. Row London Constructio…
2. London Construction Co…
3. IFA Construction LTD
4. SX Basement Constructi…
5. BaseBuild Groundworks…
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London's general contractors compared

#	Business	Rating	Reviews	Best for
1	Row London Construction Ltd	5.0 ★	92	Overall / bathroom and kitchen renovations	View ›
2	London Construction Company Toms-Arbel Ltd	4.9 ★	62	Full house refurbishments	View ›
3	IFA Construction LTD	5.0 ★	39	Extensions and loft conversions	View ›
4	SX Basement Construction London	5.0 ★	36	Basement conversions and excavation	View ›
5	BaseBuild Groundworks Construction	5.0 ★	34	Structural steelwork and groundworks	View ›

5 Best General Contractor Firms in London (2026)

Our top picks for general contracting work

#1 Overall🕑 Open 6 days/wk↩ Responds to reviews

Row London Construction Ltd

5.092 Google reviews

Row London Construction Ltd is a construction and refurbishment company based near Regent's Park, taking on residential and commercial building projects across London, with reviewers most often describing full bathroom and kitchen renovation jobs led by a contact named Mario.

What people praise

Reviewers repeatedly praise Mario for sourcing materials and managing timelines without the client needing to chase anything
Multiple customers describe work completed to a high standard at a reasonable price
Several reviewers say they plan to use the company again for future projects

Reputation scorecardrank in London

Rating5 / 5

Review volume92 · 98th

Confidencemoderate

Recency5 months ago

Info completenesssite · phone · hours

Rating breakdown100% 5-star

✓ VerifiedSource: Google

Our take: A perfect 5.0 across 92 reviews, the highest review count on this page, makes this the strongest all-round pick, especially for kitchen and bathroom-scale renovations.

Website +447440151642 Directions

93 Regent's Park Rd, London NW1 8UR

#2🕑 Open 6 days/wk

London Construction Company Toms-Arbel Ltd

4.962 Google reviews

London Construction Company, operating as Toms-Arbel Ltd, takes on full property refurbishments across East London, with reviewers describing complete renovations of Victorian houses, warehouse conversions and factory-conversion flats, run by a contact named Sacha.

What people praise

Reviewers consistently describe Sacha as attentive to detail and a genuine partner throughout large, stressful projects
Structural issues handled directly, including bringing in a structural engineer when unforeseen problems arose
Multiple reviewers have used the company for a second phase of work after their first project

Worth knowing

One reviewer noted a full refurbishment took six months against an original two-month estimate, though attributed the extension to the scope growing once work began

Reputation scorecardrank in London

Rating4.9 / 5

Review volume62 · 93rd

Confidenceearly

Recency2 months ago

Info completenesssite · phone · hours

Rating breakdown97% 5-star

✓ VerifiedSource: Google

Our take: At 4.9 stars on 62 reviews, this is the strongest pick on this page specifically for a full, structurally complex house refurbishment rather than a single-room job.

Website +447902010974 Directions

3, parkinson house, Frampton Park Rd, London E9 7PH

#3🕑 Open 7 days

IFA Construction LTD

5.039 Google reviews

IFA Construction LTD is based in Pimlico, taking on house extensions, loft conversions, new builds and refurbishments, with reviewers describing everything from a spa and sauna build to a full loft conversion and a restaurant fit-out, led by a director referred to as AJ.

What people praise

AJ personally present throughout projects, per multiple reviewers
One loft conversion finished two weeks ahead of schedule before Christmas, per a detailed review
Praised for accommodating design changes mid-project without losing quality

Reputation scorecardrank in London

Rating5 / 5

Review volume39 · 88th

Confidenceearly

Recency8 weeks ago

Info completenesssite · phone · hours

Rating breakdown100% 5-star

✓ VerifiedSource: Google

Our take: A perfect 5.0 across 39 reviews makes this a strong specialist pick for extensions and loft conversions, though the review base is smaller than the two firms above it.

Website +447463740312 Directions

33C Cumberland St, Pimlico, London SW1V 4LU

#4🕑 Open 6 days/wk↩ Responds to reviews

SX Basement Construction London

5.036 Google reviews

SX Basement Construction London, trading as London Basement Excavation, specialises in basement conversions under existing houses, handling planning, party wall agreements, structural engineering and the excavation and build itself. Reviewers describe converting terraced-house basements into extra floors, home offices and dry storage after fixing failed waterproofing.

What people praise

Reviewers repeatedly praise the firm for managing planning, party wall and structural engineering directly, removing the need to coordinate multiple contractors
One long-standing damp problem traced to a failed original waterproofing system and fully resolved
No unexpected additions to the final bill, per one detailed review

Worth knowing

Reviewers note basement work is inherently not cheap, though describe pricing as fair for the scope

Reputation scorecardrank in London

Rating5 / 5

Review volume36 · 83rd

Confidenceearly

Recency3 months ago

Info completenesssite · phone · hours

Rating breakdown100% 5-star

✓ VerifiedSource: Google

Our take: At 5.0 stars on 36 reviews, this is the clear specialist pick if your project is specifically a basement conversion or excavation, a niche few general contractors handle end to end.

Website +447520637289 Directions

92 Great Portland St, London W1W 5PN

#5🕑 Open 5 days/wk↩ Responds to reviews

BaseBuild Groundworks Construction

5.034 Google reviews

BaseBuild Groundworks Construction, based near Piccadilly, focuses on structural steelwork, underpinning, concrete and groundworks, including load-bearing wall removals, subsidence repair and drainage failures. Reviewers describe jobs other contractors turned down due to tight access or complexity.

What people praise

Reviewers describe the firm succeeding where other companies said access was too tight, including underpinning without disturbing a neighbouring fence
A misaligned steel beam caught and corrected before being concreted in, per one detailed review, saving weeks of rework
Clear, plain explanations of technical staged work like underpinning bays curing in sequence

Reputation scorecardrank in London

Rating5 / 5

Review volume34 · 78th

Confidenceearly

Recency3 weeks ago

Info completenesssite · phone · hours

Rating breakdown100% 5-star

✓ VerifiedSource: Google

Our take: A perfect 5.0 across 34 reviews, the newest and smallest review base on this page, but the reviews describe genuinely technical structural work handled with unusual care.

Website +442037693915 Directions

180 Piccadilly, London W1J 9HF

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How we score these contractors

Rating is the live Google average for each business. Review volume measures how many customers have actually rated them, benchmarked against the others on this page. Confidence blends the rating with that volume, since a perfect score on a handful of reviews carries less weight than the same score on hundreds. Recency checks how recently people are still leaving reviews. No business can pay to change any of these numbers.

How much does a general contractor cost in London? (2026)

None of the firms on this page publish fixed pricing, and general contracting costs vary enormously by project scope, from a single-room renovation to a full structural refurbishment or basement dig. Get a detailed, site-specific quote from more than one firm before committing.

General contractors across London

Coverage spans Regent’s Park, Hackney and East London, Pimlico, and central London near Piccadilly, so most of Greater London sits within reach of at least one of these five firms. If you’re searching for a general contractor near me, it’s worth matching the firm to your project type first, since several of these specialise (basements, structural steel, extensions) rather than taking on every kind of job equally.

What to ask before you hire a general contractor

Have they handled a project of this scale and type before, and can they show examples?
Who manages planning permission, party wall agreements or building control sign-off?
Is there a fixed-price quote, or is it subject to change once work uncovers unforeseen issues?
What’s the realistic timeline, and how do they communicate if it changes?
Are they insured, and do they carry public liability cover for the project?
Who is the single point of contact on site day to day?

Frequently asked questions

Are these rankings paid?

No. Rankings come from public Google data. A business can pay to be a Featured Partner (badge and top placement), but that never changes another business’s score or position.

How did you choose these general contractor firms?

We compared businesses with real Google review activity in London’s general contracting trade, weighing their rating, review volume, and how recently customers have been reviewing them.

How often is this updated?

This page reflects Google data verified in August 2026 and is refreshed periodically as ratings and review counts change.

Which is the highest-rated general contractor in London on this list?

Row London Construction Ltd leads with a perfect 5.0 rating across 92 reviews, the deepest track record on this page.

How long does a full house refurbishment take in London?

Reviewers here describe timelines from a few weeks for a single-room renovation up to six months for a full structural refurbishment, depending on scope.

The bottom line

Row London Construction Ltd is the safest default for most renovation jobs, with the deepest review history and a perfect rating on this page. For a specialist project like a basement conversion or structural steelwork, SX Basement Construction London or BaseBuild are worth calling directly instead.

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