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Structural Engineers in Tonbridge and Malling
Residential structural engineering that doesn't leave you guessing
Expert structural calculations for extensions, lofts, and renovations in Tonbridge and Malling, Kent.
We know Tonbridge and Malling's housing stock and what Tonbridge & Malling Borough Council expects
Offices in Manchester, London and Gloucester, with engineers around the country for site visits. We've worked extensively across Kent and know Tonbridge and Malling well — the Medieval → modern Brick semis, timber cottages, the party wall situations that come with them.
More importantly, we know how Tonbridge & Malling Borough Council’s building control team operates and we write our calculations to match. That saves time on site and avoids queries coming back.
Local knowledge
PorthouseDean provides structural engineering for extensions, knock-throughs, loft conversions, and two-storey extensions in Tonbridge and Malling. With 220+ calculations completed across Kent, our engineers understand the area's Medieval → modern Brick semis, timber cottages properties, ensuring every design accounts for local building characteristics and London Clay ground conditions. Our most recent project in the area was a single storey extension completed in Dec 2025.
Houses are all we do. That specialism matters when something goes awkward.
We don't do commercial. We don't do bridges. We do extensions, loft conversions, knockthroughs, new builds — and we've done over 220+ of them with a 100% building control success record.
That specialism means when your project throws up something unexpected — and they always do — we've seen it before. We know what works, what building control will push back on, and what your builder actually needs on the page to build from.
The quote's the easy part. It's three weeks later that matters.
The difference between structural engineers doesn't show up in a quote. It shows up when your builder's on site and something doesn't add up. When building control come back with a query. When the design changes halfway through and someone needs new calcs yesterday.
Our calculations are detailed enough that your builder can work from them without ringing anyone. When BC come back with a query, we deal with it — as many as they want. If they want something changed, we change it.
Project changes? Every quote includes a free amendment because we know designs evolve. Need to speak to your engineer? We give you a direct booking link for meetings, and our tech support team handles urgent queries whenever you need them.
A builder standing around waiting for a structural answer costs real money. We're the engineers who pick up the phone.
Fixed fee. No surprises after you've committed.
The number we quote is the number you pay. No extras bolted on for BC queries, no awkward invoice three months later.
Recent Projects Near Tonbridge and Malling
Single storey extension
Single storey extension
Knock-through
Loft conversion
Single storey extension
Send plans. Get a quote. We handle the rest.
Send us your plans
Fixed fee quote within 24 hours. No obligation, no chasing.
What people say
Other Areas in Kent
Frequently Asked
If you're removing a wall, converting a loft, building an extension, or doing anything that affects the structure of your house — yes. Building control will require structural calculations before they sign off the work.
A virtual site visit is included in every quote — it's a chance to put a face to the name and talk through specific design requirements with your engineer. But we don't believe a physical visit is necessary for most residential projects. Working remotely allows us to be more economical while maintaining the same quality throughout. If your project does need a physical visit, we have engineers around the country who can arrange one.
Quote within 24 hours of receiving your plans — often much quicker. Standard delivery is 10 working days, but we can turn calculations around in as little as 1 working day if you need them urgently.
Based on our 220+ projects across Kent, structural calculations typically start from £500 + VAT depending on complexity.
Fees depend on the scope and complexity of your project. We provide clear, fixed-fee quotes within 24 hours so you know exactly what you'll pay before we start. No hidden costs, no extras for building control queries.
Every quote includes one free amendment because we know projects change — that's normal. Beyond that, we'll quote any further changes clearly so there are no surprises.
The quote's not the product — the project is. A cheaper set of calculations might get you through the door, but when building control query something or your builder can't follow the drawings, that's when it costs you. We include BC queries, an amendment, and a virtual site visit because that's where projects actually succeed or fail.
Local Area Information
Understanding Tonbridge and Malling's unique characteristics helps us deliver precise structural solutions.
About Our Tonbridge and Malling Structural Engineering Services
Structural Engineering Excellence in Kent
Choosing the right structural engineer means finding someone who truly understands your area. We specialize in Kent properties, working regularly with everything from Medieval → modern homes built with Brick semis, timber cottages. This local expertise ensures our designs satisfy Tonbridge & Malling Borough Council building regulations efficiently.
Foundation Design for Kent’s Soil Types
Successful structural projects begin with proper foundation design. Kent’s typical London Clay presents specific engineering requirements. Clay with flint seams We incorporate this geological knowledge throughout our calculations, ensuring safe, durable foundations for extensions, conversions, and renovations.
Local Expertise, Professional Service
Riverside cottages, suburban semis This diversity means we’ve developed expertise across all property types – whether you’re extending a period property near Tonbridge Castle; Lullingstone Roman Villa or renovating a modern home with easy access to Southeastern; A21.
We maintain strong working relationships with Tonbridge & Malling Borough Council building control, streamlining approvals for your project. Our structural calculations are accepted first time, avoiding costly delays.
Structural Engineering Services Throughout Kent
We provide comprehensive structural calculations across Kent (population: 136 k), covering:
• Loft conversions and dormer additions
• Rear extensions – single and double storey
• Side and wrap-around extensions
• Load-bearing wall removal calculations
• Foundation designs and underpinning assessments
Request Your Free Kent Structural Engineering Quote
Starting your project? Get in touch with PorthouseDean for structural calculation pricing in Kent. Expect our detailed, fixed-fee quotation within 24 hours.
Ready to get started?
Send us your plans for a fixed-fee quote within 24 hours. Or call us — we actually answer.
