Structural surveys and below ground drainage design across London, Sussex and Kent

Kelp Studio is a civil and structural engineering practice with 12+ years’ experience on every type of building, from period homes and extensions to new-build developments.

We’re one of the few structural engineers who also design your drainage. That means one team for your structural calculations and your SuDS strategy, fewer handovers, and a design that works below ground as well as above it.

What we do
• Structural surveys and reports: non-intrusive visual surveys with findings and recommendations, covering cracking, subsidence, bowing walls, roof and floor defects, and pre-purchase checks.
• SuDS and drainage design: drainage strategies for planning, discharge of conditions, and S106 / build-over agreements with local water authorities.
• Structural design: calculations, drawings and specifications for extensions, lofts, wall removals and new builds.
• Planning services

Why clients choose us
• 12+ years’ experience across all building structures
• Structural and drainage design under one roof
• £1,000,000 professional indemnity insurance
• Survey reports typically issued within 48 hours of the site visit

We work across London, Sussex and Kent from our office at 45 Fitzroy Street, W1.

If you’d like to discuss your project, please complete our online form or call us on 020 3835 2633.

What our clients say

★★★★★
Advice on issues raised in building survey

“Kelp Studio were excellent - providing a thorough assessment of potential structural movement issues flagged in the building survey for a house purchase. His friendly and supportive approach was much appreciated and complemented by the professional report received afterwards.”

Job location: SE23

★★★★★
Structural design for Rear Extension

“The team did a fantastic job. They have understood the architectural design and created a beautiful structure that maximized our space without compromising any of the finishes and details we wanted. Excellent service throughout the entire process either by attending site meetings, phone or email. Really recommend their services.”

Job location: SE6

★★★★★
Full renovation of ground floor with many walls moved/removed

“A dedicated company from start to finish. With a real personal touch from Mark who was contactable throughout by ourselves and our builder. Mark was adaptable and explained everything clearly so we always knew and understood what was going on. An all round excellent company with great work ethics.”

Job location: SE9

★★★★★
Structural calculations and drawings

“Kelp Studio Engineers produced structural calculations and drawings for some internal alterations we’ve made. These were used in liaisons with the council and to assist contractors who carried out the final work. Mark was very friendly and professional and also assisted with local building control, which helped speed the process along. I was impressed with the quality and detail of the drawings. Overall a great experience with Kelp Studio - everything felt under control from day one, highly recommend.”

Job location: BN3

★★★★★
Visual assessment of property and advice

“Very approachable and knowledgable engineers, they were reassuring with advice and adaptable with the services offered at a very reasonable price. Joana listened to noted observations and took the time to assess the property as a whole, explaining rationales in an easy to understand way. It was a pleasure to engage Kelp for this service.”

Job location: TN39

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