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We know Tandridge's housing stock and what Tandridge District Council expects
Loft and extension structural support in Tandridge.
Based in Manchester, with engineers around the country for site visits. We've worked extensively across Surrey and know Tandridge well — the Medieval → modern Brick semis, cottages, the party wall situations that come with them.
More importantly, we know how Tandridge District 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 Tandridge. With 680+ calculations completed across Surrey, our engineers understand the area's Medieval → modern Brick semis, cottages properties, ensuring every design accounts for local building characteristics and Greensand & clay ground conditions. Our most recent project in the area was a loft conversion completed in Jan 2026.
Structural engineering is the core of it. It isn’t where we stop.
The calculations and drawings are ours. So are the things around them that usually land on you: a date you can plan around, one place where everyone sees the same documents, and the change of mind nobody priced for. More than 9,000 projects since 2012 have run through the same process, from a single wall removal to a whole new build.
Three things you always know
Every job runs through the same process, so every customer gets the same three answers.
The price, before you commit
Tell us about the project and we’ll tell you the price and the steps that follow. No hourly rate. If the job changes, there is a free change request on every job.
The turnaround, chosen by you
Pick how fast you need it, and pay less if you can wait. You get a date to work back from.
Every step, in one place
Never wonder where it’s up to — just look. Your project hub shows what is happening now, what is next and anything we need from you, with your drawings, documents and invoice alongside. Share it directly with everyone involved in your project.
One document for building control, one for your builder
Building control gets the calculations. Your builder gets the contractor pack. If either of them has a question about the structure, it comes to us, not to you. How we check and what the process looks like.
Fixed fee. No surprises after you've committed.
No extras for building control queries.
Recent Projects Near Tandridge
Single storey extension
Single storey extension
Single storey extension
Unspecified
Single storey extension
Send us your plans
A fixed price before you commit. No obligation, no chasing.
What people say
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Frequently Asked
It depends on the size and complexity of your project, so we don't publish a price range for Tandridge. Tell us about your project and you get a clear, fixed-fee quote before you commit.
Sure, we have worked on a wide variety of Tandridge's Medieval - modern properties. Our engineers aim to understand the specific requirements of your property from Brick semis, cottages construction, ensuring calculations that respect the original structure while meeting modern standards.
Tandridge typically has Greensand & clay. Greensand ridge over clay. We factor these conditions into our foundation designs, which may affect the depth and type of foundations required.
On a full plans application, Tandridge District Council has five weeks to decide, or longer if you both agree it in writing (regulation 14A of the Building Regulations 2010). On a building notice there is no plans decision: building control checks the work, and our calculations, as it goes. If they raise a question about the structure, your engineer answers it.
We provide structural calculations throughout Tandridge and the surrounding Surrey area. Our engineers regularly work on projects across the region, and you choose the delivery date that suits you.
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.
On the date you choose when you book. The price follows the date: pick a later one and it costs less, or an earlier one if you need them sooner.
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. The moments that cost you come later: when building control query something, or your builder can't follow the drawings. That's why BC queries, an amendment and a virtual site visit are included — it's where projects actually succeed or fail.
Local Area Information
Understanding Tandridge's unique characteristics helps us deliver precise structural solutions.
Structural engineering services in Tandridge
Structural Engineering Excellence in Surrey
Choosing the right structural engineer means finding someone who truly understands your area. We specialize in Surrey properties, working regularly with everything from Medieval → modern homes built with Brick semis, cottages. This local expertise means our designs are written to satisfy Tandridge District Council building regulations.
Foundation Design for Surrey’s Soil Types
Successful structural projects begin with proper foundation design. Surrey’s typical Greensand & clay presents specific engineering requirements. Greensand ridge over clay We incorporate this geological knowledge throughout our calculations, ensuring safe, durable foundations for extensions, conversions, and renovations.
Local Expertise, Professional Service
Village cottages, small hamlets This diversity means we’ve developed expertise across all property types – whether you’re extending a period property near Oxted; Godstone Village or renovating a modern home with easy access to Oxted Line; A25.
We maintain strong working relationships with Tandridge District Council building control, streamlining approvals for your project. Our calculations are approved by building control, or you get a refund.
Coverage Across Surrey
Operating throughout Surrey and surrounding areas (population: 90 k), 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
Request Your Free Surrey Structural Engineering Quote
Starting your project? Get in touch with PorthouseDean for structural calculation pricing in Surrey. You’ll have a detailed, fixed-fee quotation before you commit.
Ready to get started?
Send us your plans and you'll have a clear, fixed price before you commit. Or give us a call.