5 Best Structural Engineer Firms in London (2026)

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

By Fenris Morrow, Expert in Professional Services · ✓ Data verified July 2026 · 8 min read

The five structural engineer firms in London on this list carry just 478 reviews between them, yet every one holds a rating between 4.8 and 5.0, an unusually tight, unusually high band for a trade most people only call on once. STAY STEEL carries the deepest of those review sets, 154, on a perfect five stars, built around one consistently named engineer.

Short answer: STAY STEEL leads with a perfect 5.0 rating across 154 reviews, built on nearly 2,000 completed UK projects and a consistently named engineer, Karim. Blue Engineering (4.9, 113 reviews) is close behind, known among London architects for including carbon emissions data alongside its structural calculations.

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1. STAY STEEL
2. Blue Engineering "We M…
3. Martin Structural Engi…
4. Alemara Structural Eng…
5. aleur associates
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London's Top Structural Engineer Firms, Compared

#	Business	Rating	Reviews	Best for
1	STAY STEEL	5.0 ★	154	Home extensions and loft conversions	View ›
2	Blue Engineering "We Make Things Stand Up"	4.9 ★	113	Architects wanting carbon-conscious specifications	View ›
3	Martin Structural Engineers Limited	4.8 ★	119	Transparent, pay-for-what-you-need pricing	View ›
4	Alemara Structural Engineers	5.0 ★	48	Structural surveys and beam installations	View ›
5	aleur associates	4.8 ★	44	Building regulation drawings for smaller projects	View ›

5 Best Structural Engineer Firms in London (2026)

Our shortlist, firm by firm

#1 Overall🕑 Open 5 days/wk

STAY STEEL

5.0154 Google reviews

STAY STEEL is a City Road firm combining structural engineering with surveying and architectural design, working with homeowners through renovation projects from initial planning through construction. The company says it has completed nearly 2,000 projects across the UK, specialising in home extensions, loft conversions, and structural assessments for residential properties. Engineer Karim is named across the large majority of the firm's reviews.

What people praise

Site visit quotes described as itemised and transparent, listing every cost upfront rather than a vague estimate
Karim praised for clear, detailed explanations that non-experts can follow
Reports described as thorough enough to support a property purchase decision
Ongoing support offered while negotiating survey findings with a seller or their agent

Reputation scorecardrank in London

Rating5 / 5

Review volume154 · 98th

Confidencemoderate

Recency4 weeks ago

Info completenesssite · phone · hours

Rating breakdown97% 5-star

✓ VerifiedSource: Google

Our take: STAY STEEL holds a perfect rating across the deepest review base on this list, and the fact that one named engineer, Karim, drives nearly every review suggests the firm has built its reputation around a specific, consistent point of contact rather than a rotating team.

Website +447375838322 Directions

128 City Rd, London EC1V 2NX

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

Blue Engineering "We Make Things Stand Up"

4.9113 Google reviews

Blue Engineering, trading as 'We Make Things Stand Up', is a Shoreditch structural engineering firm working primarily with architects and homeowners on domestic extensions and renovation projects. The firm distinguishes itself by including carbon emissions calculations for structural materials alongside its standard drawings and specifications, a detail several repeat architect clients specifically praise.

What people praise

Architects describe long-term repeat working relationships across multiple projects
Carbon emissions data included in structural documentation, described as genuinely useful rather than a gimmick
Clear, easy-to-read drawings that streamline coordination with other trades
Responsive to questions and revisions on submitted specifications

Worth knowing

Its most recent reviews run older than several other firms on this list, so it's worth confirming current availability directly.

Reputation scorecardrank in London

Rating4.9 / 5

Review volume113 · 88th

Confidencemoderate

Recencyabout a year ago

Info completenesssite · phone · hours

Rating breakdown95% 5-star

✓ VerifiedSource: Google

Our take: Blue Engineering ranks second on a near-perfect 4.9 rating, and the fact that so many reviewers are architects rather than one-off homeowners suggests the firm has built real trust among repeat professional clients, not just first-time renovators.

Website +442072473811 Directions

113 Shoreditch High St, London E1 6JN

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

Martin Structural Engineers Limited

4.8119 Google reviews

Martin Structural Engineers Limited, also trading as Martin Redston Associates, is a King's Cross firm of Chartered and near-Chartered engineers specialising in residential and small-to-medium commercial projects across London. The firm covers basement impact assessments, subsidence and cracking investigations, roof conversions, and new build work, and structures its fees around a single site-visit charge with additional costs only for extra work identified.

What people praise

Fee structure described as transparent, with clients praising the pay-for-what-you-need approach over firms that charge upfront for a report before it's clear one is needed
Same clients return across multiple projects and years, including first-time buyers who came back for later renovations
Engineers described as responsive to calls and emails, often replying the same day
Site visits arranged quickly, in some cases within a day of first contact

Reputation scorecardrank in London

Rating4.8 / 5

Review volume119 · 93th

Confidencemoderate

Recency2 months ago

Info completenesssite · phone · hours

Rating breakdown94% 5-star

✓ VerifiedSource: Google

Our take: Martin Structural sits third on a strong 4.8 rating built from a larger review base than two of the firms below it, which gives its score more weight even though the raw number is lower than Alemara's perfect 5.0.

Website +442078375377 Directions

4 Edward Square, London N1 0SP

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

Alemara Structural Engineers

5.048 Google reviews

Alemara Structural Engineers is a Knightsbridge firm offering structural surveys and civil engineering services for residential projects across London, including beam installations and wall assessments for open-plan renovations. The firm works with a small named team, including engineers Nas, Hayder, and Mohamed, across both survey and construction-support work.

What people praise

Structural surveys described as authoritative and well written, resolving technically difficult problems clearly
Team members praised for going beyond the immediate scope of the job to answer follow-up questions
Repeat clients describe using the firm across multiple separate projects at the same property
Efficient, well-communicated process from first enquiry through completed report

Reputation scorecardrank in London

Rating5 / 5

Review volume48 · 78th

Confidenceearly

Recency6 weeks ago

Info completenesssite · phone · hours

Rating breakdown96% 5-star

✓ VerifiedSource: Google

Our take: Alemara posts the equal-highest rating on this list at a perfect 5.0, yet ranks fourth because its review count is the smallest of the top four firms here. It's an early but genuinely strong track record, not yet backed by the volume of Martin Structural above it.

Website +442080049911 Directions

64 Knightsbridge, London SW1X 7JF

#5🕑 Open 5 days/wk

aleur associates

4.844 Google reviews

aleur associates is a King's Cross Road consultant civil and structural engineering firm providing structural drawings and calculations for building regulation purposes, working mainly on rear and side extensions, loft conversions, and internal alterations. The firm is run personally by its named principal, Aleur, who conducts site visits and produces reports directly for smaller domestic projects.

What people praise

Aleur personally handles site visits and reports rather than delegating to junior staff
Structural letters described as accepted by freeholders and building control without follow-up queries
Consistently described as responsive and quick to arrive for a site visit
Clients report using the firm across more than ten separate projects over several years

Worth knowing

Its most recently published reviews are older than every other firm on this list, so it's worth confirming current turnaround times directly before booking.

Reputation scorecardrank in London

Rating4.8 / 5

Review volume44 · 73th

Confidenceearly

Recency2 years ago

Info completenesssite · phone · hours

Rating breakdown93% 5-star

✓ VerifiedSource: Google

Our take: aleur associates rounds out the list on a solid 4.8 rating, though its review activity has slowed compared to the other four firms here. The long-standing repeat clients suggest real reliability, it's just worth checking current availability given how the review pace has changed.

Website +442079932055 Directions

International House, 101 King's Cross Rd, London WC1X 9LP

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How we scored these firms

Rating is each firm’s live Google average, and review volume measures how many clients actually left one, ranked against the wider pool of London structural engineers we pulled. Confidence weighs the rating against that volume, so a perfect score from a smaller sample scores lower than a strong score backed by hundreds of reviews. Recency checks how current those reviews are. No firm can pay to move these numbers.

What does a structural engineer cost in London? (2026)

Fees vary by project scope, whether you need a single structural calculation for a loft conversion or a full basement impact assessment, and several firms above charge a site-visit fee first, then price any further work once the scope is clear. Ask for a breakdown of what’s included in the initial fee before you commit.

Covering every London borough

These five firms are based across central and north London, from Shoreditch and City Road to King’s Cross and Knightsbridge, and each works on projects well beyond its home postcode. A search for structural engineer near me will likely surface at least two or three of these five, whichever London borough you’re renovating in.

Questions worth asking before you hire a structural engineer

Do you charge a flat site-visit fee, or is the full cost quoted upfront?
Will you personally handle the site visit and report, or a junior member of the team?
How long until I receive the structural calculations or report after the site visit?
Have you worked on this type of project before, such as a basement or loft conversion?
Will your report or letter be accepted by building control and any freeholder involved?

Frequently asked questions

Are these rankings paid?

No. Rankings come from public Google data, including live ratings and review counts. A business can pay to be a Featured Partner with badge placement, but that never changes another firm’s score or position, and none of the firms on this page paid for their spot.

How did you choose these five firms?

We compared London structural engineer firms on real Google ratings, review volume, and how recently people were still reviewing them, then weighed that against how many reviews back up the score.

How often is this page updated?

We last verified ratings and review counts in July 2026 and refresh this page periodically as new Google data comes in.

Do I need a structural engineer or a surveyor?

A surveyor typically assesses a property’s overall condition, while a structural engineer produces calculations and drawings for specific structural work, such as removing a wall or building an extension. Some firms above, like STAY STEEL, offer both.

Will building control accept a report from any of these firms?

Reviewers across several of these firms describe their reports and structural letters being accepted by building control and freeholders without follow-up queries, though it’s worth confirming for your specific borough and project.

The bottom line

For the deepest track record on a perfect rating, STAY STEEL is the safe default, especially with one consistently named engineer behind most of its reviews. If you’re an architect or designer looking for a long-term structural partner, Blue Engineering’s repeat professional relationships are worth a closer look.

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