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Structural Engineers in Oxfordshire
Residential structural engineering that doesn't leave you guessing
Expert structural calculations for extensions, lofts, and renovations in Oxfordshire, Oxfordshire.
We know Oxfordshire's housing stock and what Oxfordshire County Council expects
Offices in Manchester, London and Gloucester, with engineers around the country for site visits. We've worked extensively across Oxfordshire — the Medieval → modern Cotswold stone, brick, the party wall situations that come with them.
More importantly, we know how Oxfordshire County 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 Oxfordshire. With 88 calculations completed across Oxfordshire, our engineers understand the area's Medieval → modern Cotswold stone, brick properties, ensuring every design accounts for local building characteristics and Jurassic limestone ground conditions. Our most recent project in the area was a unspecified completed in Nov 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 88 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 Oxfordshire
Single storey extension
Single storey extension
Other
Knock-through
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
Areas We Cover in Oxfordshire
Select your area below for local project data and a quote tailored to your location.
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 88 projects across Oxfordshire, 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 Oxfordshire's unique characteristics helps us deliver precise structural solutions.
About Our Oxfordshire Structural Engineering Services
Why Choose Our Oxfordshire Structural Engineers?
Our team brings deep local knowledge to every project. We understand Oxfordshire’s unique building heritage – from Medieval → modern properties with their characteristic Cotswold stone, brick construction. This expertise matters when calculating loads, designing foundations, and ensuring your project meets Oxfordshire County Council building regulations.
Understanding Oxfordshire’s Ground Conditions
Foundation design in Oxfordshire requires careful attention to local geology. The area’s Jurassic limestone demands specific engineering approaches. Limestone bedrock, river gravels We factor these ground conditions into every design, whether you’re planning an extension, loft conversion, or structural modification.
Comprehensive Knowledge of Oxfordshire Properties
Oxfordshire’s housing includes Village cottages, riverside townhouses, and we’ve worked across this entire spectrum. Your project might be close to Blenheim Palace; Oxford University or positioned for excellent transport links via Cotswold Line; M40 – either way, we know the area.
Years of working with Oxfordshire County Council building control means we understand exactly what they need. Our calculations consistently pass first-time review, keeping your project on schedule.
Structural Engineering Services Throughout Oxfordshire
We provide comprehensive structural calculations across Oxfordshire (population: 687 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
Get Started With Your Oxfordshire Structural Calculations
Planning your extension or conversion? Reach out to PorthouseDean for structural calculation costs in Oxfordshire. You’ll receive our transparent, fixed-price quote 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.
