Structural Engineers in London

Kelp Studio are structural and civil engineers based in Fitzrovia, central London, working with homeowners, architects, builders and developers across every London borough. From a single steel beam to a full extension, loft conversion or new build, we design structures that are safe, buildable and approved by Building Control, and we survey existing buildings when something doesn’t look right.

Get a quote or call 020 3835 2633

Our structural engineering services in London

Extensions and alterations
Structural design and calculations for rear and side return extensions, wraparound extensions and open-plan alterations, including foundations and steelwork. Structural design →

Wall removals and steel beams
Beam and padstone calculations for removing load-bearing walls and chimney breasts, ready for Building Control. Wall removal calculations →

Loft conversions
Calculations for dormer, hip-to-gable and mansard loft conversions, including new floor joists, steels and roof alterations. Loft conversion calculations →

Structural surveys and reports
Crack and subsidence reports, pre-purchase surveys and general structural inspections, with clear recommendations. Structural surveys in London →

Drainage, SuDS and flood risk
Drainage strategies, SuDS design, flood risk assessments and Thames Water build-over and sewer agreements. Civil engineering →

Building in London: what we look out for
• London clay: much of London sits on shrinkable clay, which moves as it wets and dries, especially near trees. We design foundations to suit.
• Victorian and Edwardian homes: terraced and semi-detached houses often have shallow foundations, timber lintels and past alterations that need checking before walls come out.
• Neighbouring buildings: in a terrace, your work affects the houses either side. We design with that in mind.
• Public sewers: many London extensions are built over or near a shared sewer, which needs Thames Water consent. Build-over agreements explained →

Areas we cover in London
We work across all of Greater London, including:
• Islington & Highbury
• Camden & Kentish Town
• Westminster & Mayfair
• Kensington & Chelsea
• Hackney & Shoreditch
• Haringey & Enfield
• Waltham Forest & Redbridge
• Fulham & Putney
• Richmond & Twickenham
• Kingston & Surbiton
• Lambeth & Wandsworth
• Clapham & Brixton
• Greenwich & Blackheath
• Lewisham & Forest Hill
• Bromley & Beckenham
• Croydon

Recent London projects
• Staines Road, Twickenham: first-floor side and rear extension along the boundary in a conservation area.
• Whitton Road, Twickenham: rear extension and remodelling, with load-bearing walls removed and new below-ground drainage.
• Four more Twickenham extensions on Walpole Road, The Ridge, Vicarage Road and Wellesley Road. Our work in Twickenham →
• Alberta Road, Enfield: loft conversion, and help obtaining planning permission.
• Pakeman Street, Holloway: beam specification to partially remove a load-bearing wall.
• Waterman Way, Wapping: loft conversion and rear extension.
• Gloucester Road, Kingston upon Thames: single-storey rear extension with large rooflights, and load-bearing walls removed to create an open-plan kitchen.
• Victoria Road, Surbiton: remodelling of a former bank into commercial offices, including removal of load-bearing walls and assessment of the roof structure.
• Gillett Road, Thornton Heath: internal remodelling of a three-storey community centre, including the removal of load-bearing walls.
• Astbury Road, Peckham: single-storey rear extension with a zinc-covered stepped roof.
• Julia Boston Antiques, King’s Road, Chelsea: structural calculations for internal alterations to the shop.
• Court Road, Eltham: single-storey rear extension, opening up the kitchen and dining areas into one space.
See more of our projects →

Why choose Kelp Studio
• 12+ years’ experience in structural and civil engineering
• £1,000,000 professional indemnity insurance
• Site visits usually within 5 working days
• Structure and drainage designed by one firm, so they fit together

Common questions

How much does a structural engineer cost in London?
It depends on the job. As a guide, a specific inspection of one crack or defect is £950 + VAT and a general inspection of a whole property is approx. £1,700 + VAT. Design and calculations are quoted per project, so send us your drawings for a quote.

How quickly can you visit?
We can usually visit within 5 working days anywhere in London.

Do I need a structural engineer for my project?
If you are removing a load-bearing wall or chimney breast, converting a loft, building an extension, or worried about cracks, then yes. Building Control will usually ask for structural calculations. Removing a wall: what you need →

Can you work with my architect and builder?
Yes. Most of our London work is alongside architects and builders, and we answer their questions on site and during construction.

Get in touch or call 020 3835 2633