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Structural Engineers in Oxford
Residential structural engineering that doesn't leave you guessing
Expert structural calculations for extensions, lofts, and renovations in Oxford, Oxfordshire.
We know Oxford's housing stock and what Oxford City Council expects
Offices in Manchester, London and Gloucester, with engineers around the country for site visits. We've worked extensively across Oxfordshire and know Oxford well — the Medieval → modern Limestone, brick, the party wall situations that come with them.
More importantly, we know how Oxford City 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 Oxford. With 88 calculations completed across Oxfordshire, our engineers understand the area's Medieval → modern Limestone, brick properties, ensuring every design accounts for local building characteristics and Alluvial clay 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 Oxford
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
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 Oxford's unique characteristics helps us deliver precise structural solutions.
About Our Oxford Structural Engineering Services
Oxfordshire Structural Calculations You Can Trust
Local knowledge makes all the difference in structural engineering. Our team has in-depth understanding of Oxfordshire’s diverse property types, spanning Medieval → modern with their typical Limestone, brick. Every calculation we produce considers local building control expectations at Oxford City Council, giving you confidence in approval.
Local Geology Expertise for Oxfordshire Projects
Every structural calculation must respond to site-specific ground conditions. In Oxfordshire, we commonly encounter Alluvial clay, requiring particular foundation solutions. River terrace deposits This geological understanding informs all our work, from simple extensions to complex structural alterations.
Oxfordshire Property Specialists
The area’s diverse building stock – Historic colleges, modern apartments – means varied structural challenges. From period properties around Christ Church; Ashmolean Museum to modern homes near Great Western Main Line; A34, we’ve engineered solutions across Oxfordshire.
Working regularly with Oxford City Council means our calculations align with their expectations. We’ve built a track record of first-time approvals, saving you time and frustration.
Serving Oxfordshire and Surrounding Areas
From our base serving Oxfordshire (population: 152 k), we provide structural engineering services for all types of residential projects:
• Loft conversions and dormer extensions
• Single and double-storey rear extensions
• Side return and wrap-around extensions
• Internal alterations and load-bearing wall removals
• Foundation design and underpinning calculations
Get Your Oxfordshire Structural Calculations Quote
Ready to start your project? Contact PorthouseDean today for a competitive quote on structural calculations in Oxfordshire. We’ll respond within 24 hours with a clear, fixed-price quotation.
Ready to get started?
Send us your plans for a fixed-fee quote within 24 hours. Or call us — we actually answer.
