Structural Engineer London Extensions • Wall Removals • Loft Conversions • New Builds
SECalcs is your trusted structural engineer in London — providing fixed-fee services across all London boroughs. From Victorian terraces in North London to period conversions in West London — we deliver Building Control-ready calculations without a site visit in most cases.
5.0/5 from 150+ reviews • Projects across Greater London
Get Your London Structural Engineer Quote
Tell us your London postcode and project type. Fixed fee confirmed within one working day.
Structural Engineer Services Across London
Our structural engineer London service covers the most common residential and commercial projects across the capital. All at the same rates as our national service — we charge no London premium.
Load-Bearing Wall Removal
RSJ beam design and Building Control calculations for London wall removals — from Victorian kitchen-to-dining knock-throughs to full ground floor open-plan remodels.
Home Extension
Foundation design, steel beam calculations and Building Control drawings for London rear extensions, side return extensions and wraparound extensions.
Loft Conversion
Floor strengthening, roof beam design and Building Control calculations for London loft conversions — Velux, dormer and hip-to-gable in period terraces and semis.
Structural Reports and Letters
Crack assessment reports, structural engineer letters and pre-purchase assessments for London properties — produced from photographs, no site visit needed.
Steel Box Frame Design
Goalpost and box frame structural calculations for London garage conversions, wide bi-fold openings and shopfront remodels where a single RSJ is not sufficient.
New Build and Self-Build
Complete structural design for new residential builds in London — foundation design, structural frame, floor and roof calculations, Building Control submission.
Structural Engineer Services Across All London Areas
We cover every London borough. Select your area — all work is carried out remotely from your drawings and photographs.
🧭 North London
- Camden
- Islington
- Hackney
- Haringey
- Barnet
- Enfield
- Waltham Forest
- Highgate • Crouch End
- Finsbury Park • Stoke Newington
🧭 South London
- Wandsworth
- Lambeth
- Southwark
- Lewisham
- Greenwich
- Merton
- Clapham • Brixton
- Peckham • Dulwich
- Tooting • Wimbledon
🧭 West London
- Kensington & Chelsea
- Hammersmith & Fulham
- Ealing
- Richmond
- Hounslow
- Notting Hill • Shepherd's Bush
- Chiswick • Acton
- Putney • Barnes
🧭 East London
- Tower Hamlets
- Newham
- Barking & Dagenham
- Havering
- Redbridge
- Bethnal Green • Bow
- Stratford • Forest Gate
- Canary Wharf • Poplar
Structural Calculations for Every London Property Type
London's housing stock is one of the most diverse in the UK — from Georgian townhouses to 1960s concrete blocks. We have experience with them all.
Victorian and Edwardian Terraces
The most common London property type. Typical structural work includes ground floor open-plan remodels, rear and side return extensions, and loft conversions in the original roof space.
- Kitchen to dining room wall removals
- Side return and rear extensions
- Dormer loft conversions
- Original timber floor assessment
Purpose-Built Flats
Structural work in London flats requires careful assessment of the existing floor and ceiling construction — particularly in 1930s to 1970s concrete-framed blocks.
- Internal wall removal within flat
- Structural assessment of existing floors
- Engineer's report for lease compliance
- Structural letter for leaseholder works
Semi-Detached Houses
Common across outer London boroughs. Projects typically involve ground floor remodels, garage conversions and loft extensions to add bedrooms without moving.
- Garage conversion goalpost frames
- Ground floor open-plan remodels
- Loft conversions in hipped roofs
- Rear extensions over single storey
Georgian and Regency Properties
Found across central and west London. These properties require careful structural assessment — original construction methods and materials differ significantly from later housing.
- Lime mortar and brick structure assessment
- Basement conversion structural design
- Period property crack assessment
- Structural report for Listed Building works
New Build and Conversion
London's demand for new housing means new build projects, barn conversions, office-to-residential conversions and self-build plots all require structural design.
- New residential structural design
- Office-to-residential conversion
- Self-build structural calculations
- Mixed-use ground floor structural design
Commercial Properties
Retail units, offices and light industrial premises across London often require structural calculations for fit-out works, shopfront remodels or change of use.
- Shopfront steel frame design
- Mezzanine floor structural calculations
- Commercial wall removal calculations
- Structural report for landlord approval
Getting a Structural Engineer in London Has Never Been Simpler
Hiring a structural engineer in London has never been easier. No need to arrange access or wait for a site visit — send your details online and we handle everything from there.
Send Your London Project Details
Share your London postcode, photographs of the property and any drawings you have. We review the project and confirm a fixed fee within one working day.
Fixed Fee Agreed
You receive a clear scope, fixed price and turnaround time before any work starts. No hourly rates. Your builder or architect knows exactly when to expect the calculation pack.
Calculations and Drawings
We produce the full structural calculation pack and builder-ready drawings — delivered digitally, ready for Building Control submission across all London boroughs.
Building Control Support
We respond directly to any London Building Control queries and provide revisions until formal approval is granted. All included in the fixed fee.
We Cover Every London Postcode
From Zone 1 to the outer boroughs — all structural engineer services delivered remotely across Greater London.
Structural Engineer London — All Zones and Boroughs
We provide structural engineer services across all 32 London boroughs and the City of London. All work is carried out remotely from your drawings and photographs — no need to arrange site access or take time off work.
London postcodes we regularly work in:
London Structural Engineering Projects We Have Completed
Comments from London homeowners, builders and architects on projects across the capital.
"We needed structural calculations for a rear extension on our Victorian terrace in Islington. SECalcs turned the full calculation pack around in a week — Building Control approved it without any queries. Much faster and better value than local London engineers we contacted."
Rear Extension — Islington, North London
"I was opening up the ground floor of my Victorian terrace in Clapham — removing two load-bearing walls to create an open-plan kitchen and living space. SECalcs produced the beam designs and Building Control calculations remotely from photographs. Professional, quick and excellent value."
Open-Plan Remodel — Clapham, South London
"Our architect recommended SECalcs for a dormer loft conversion in Chiswick. The calculation pack was exactly what Building Control needed and the drawings were clear for our builder to follow. Fixed price, fast turnaround — we'd use them again without hesitation."
Dormer Loft Conversion — Chiswick, West London
Structural Engineer London — Questions Answered
Common questions from London homeowners, builders and architects.
Yes. SECalcs provides structural engineer services across all 32 London boroughs and the City of London. We cover North London, South London, East London, West London and Central London — all postcodes from Zone 1 to the outer boroughs. Most projects are completed remotely without a site visit.
We charge the same fixed fees across the UK — there is no London premium. Wall removal RSJ calculations start from £300. Loft conversion structural calculations start from £450. Home extension calculations start from £550. New build structural design starts from £1,500. All fees are agreed upfront before any work begins.
No, in the vast majority of cases. We produce full structural calculations and Building Control-ready drawings from your photographs and architect's drawings. This is particularly practical in London where arranging access to flats, tenanted properties and period buildings can be difficult. A site visit is only needed for genuinely unusual structures — we will tell you upfront if that is the case.
We submit to all London Building Control departments — whether through the Local Authority Building Control (LABC) in your borough or through an Approved Inspector. Our calculation packs are formatted and referenced for Building Control submission across all London boroughs and accepted without exception.
Yes. We produce structural engineer reports, crack assessment letters and pre-purchase assessments for London properties based on photographs. These are commonly required by London mortgage lenders, solicitors and managing agents for leasehold properties. Fixed fee from £250, delivered within three to five working days.
Yes — all four. West London including Kensington, Chelsea, Hammersmith, Ealing and Richmond. North London including Camden, Islington, Hackney and Barnet. South London including Wandsworth, Lambeth, Southwark and Greenwich. East London including Tower Hamlets, Newham and Waltham Forest. Every London postcode is covered.
Need a Structural Engineer in London?
As your structural engineer in London, we'll confirm a fixed fee within one working day. Send your postcode and project details to get started.
- Head Office: Corwell Lane, Uxbridge, England, UB8 3DE.
- 07359 267907
- info@structuralengineercalcs.com
- Company No: 12653163