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Structural Engineers in Hertfordshire
Residential structural engineering that doesn't leave you guessing
Nationwide-calibre support for home projects across Hertfordshire. Contact PorthouseDean Structural Engineers today to get your calculations sorted.
We know Hertfordshire's housing stock and what Hertfordshire County Council expects
Offices in Manchester, London and Gloucester, with engineers around the country for site visits. We've worked extensively across Hertfordshire — the Medieval → modern Brick & flint, timber frame, the party wall situations that come with them.
More importantly, we know how Hertfordshire 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 Hertfordshire. With 240+ calculations completed across Hertfordshire, our engineers understand the area's Medieval → modern Brick & flint, timber frame properties, ensuring every design accounts for local building characteristics and Chalk 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 240+ 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 Hertfordshire
Single storey extension
Two-storey extension
Two-storey extension
Single storey extension
Other
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 Hertfordshire
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.
Having completed 240+ projects across Hertfordshire, we can confirm structural calculations typically start from £500 + VAT.
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 Hertfordshire's unique characteristics helps us deliver precise structural solutions.
About Our Hertfordshire Structural Engineering Services
Hertfordshire Structural Calculations You Can Trust
Local knowledge makes all the difference in structural engineering. Our team has in-depth understanding of Hertfordshire’s diverse property types, spanning Medieval → modern with their typical Brick & flint, timber frame. Every calculation we produce considers local building control expectations at Hertfordshire County Council, giving you confidence in approval.
Local Geology Expertise for Hertfordshire Projects
Every structural calculation must respond to site-specific ground conditions. In Hertfordshire, we commonly encounter Chalk, requiring particular foundation solutions. Chalk with superficial clay This geological understanding informs all our work, from simple extensions to complex structural alterations.
Hertfordshire Property Specialists
The area’s diverse building stock – Villages, market-town cottages – means varied structural challenges. From period properties around Hatfield House; Knebworth House to modern homes near East Coast Main Line; M1, we’ve engineered solutions across Hertfordshire.
Working regularly with Hertfordshire County Council means our calculations align with their expectations. We’ve built a track record of first-time approvals, saving you time and frustration.
Coverage Across Hertfordshire
Operating throughout Hertfordshire and surrounding areas (population: 1.2 M), our services include:
• Loft conversion and roof extension calculations
• Extension designs – all configurations
• Internal structural alterations
• Steel beam and RSJ specifications
• Foundation and underpinning calculations
Get Your Hertfordshire Structural Calculations Quote
Ready to start your project? Contact PorthouseDean today for a competitive quote on structural calculations in Hertfordshire. 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.
