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Structural Engineers in Stevenage
Residential structural engineering that doesn't leave you guessing
Quick calculations and drawings for Stevenage renovations. Speak to our engineers today and get peace of mind for your project.
We know Stevenage's housing stock and what Stevenage Borough Council expects
Offices in Manchester, London and Gloucester, with engineers around the country for site visits. We've worked extensively across Hertfordshire and know Stevenage well — the New Town (1950s) → modern Concrete panels, brick, the party wall situations that come with them.
More importantly, we know how Stevenage 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 Stevenage. With 240+ calculations completed across Hertfordshire, our engineers understand the area's New Town (1950s) → modern Concrete panels, brick properties, ensuring every design accounts for local building characteristics and Boulder 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 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 Stevenage
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
Other Areas in Hertfordshire
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 240+ projects across Hertfordshire, 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 Stevenage's unique characteristics helps us deliver precise structural solutions.
About Our Stevenage Structural Engineering Services
Professional Structural Calculations for Hertfordshire Properties
Your project deserves engineers who know Hertfordshire inside and out. We work extensively with the area’s building heritage – New Town (1950s) → modern constructions using Concrete panels, brick. Our familiarity with Stevenage Borough Council processes means faster approvals and fewer complications for your project.
Structural Calculations Tailored to Hertfordshire Properties
Every area has its challenges. In Hertfordshire, we regularly work with Boulder clay, which requires specific foundation design approaches. Boulder clay Our structural engineers account for these local conditions in every calculation, ensuring your extension, loft conversion, or structural alteration is built on solid foundations.
Experience Across Hertfordshire’s Property Types
From New-town townhouses & flats, we’ve handled projects throughout Hertfordshire. Whether your property sits near Fairlands Valley Park or benefits from proximity to East Coast Main Line, we understand the local context.
Our established relationship with Stevenage Borough Council building control helps expedite your project. We consistently deliver calculations that meet their standards, minimising delays and resubmissions.
Serving Hertfordshire and Surrounding Areas
From our base serving Hertfordshire (population: 88 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
Structural Calculations Quote for Your Hertfordshire Project
Ready to move forward? Contact PorthouseDean for structural engineering services in Hertfordshire. We provide clear, competitive quotes within one business day.
Ready to get started?
Send us your plans for a fixed-fee quote within 24 hours. Or call us — we actually answer.
