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We know Dartford's housing stock and what Dartford Borough Council expects
Expert structural calculations for extensions, lofts, and renovations in Dartford, Kent.
Based in Manchester, with engineers around the country for site visits. We've worked extensively across Kent and know Dartford well — the Victorian → modern Brick terraces, flats, the party wall situations that come with them.
More importantly, we know how Dartford 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 Dartford. With 220+ calculations completed across Kent, our engineers understand the area's Victorian → modern Brick terraces, flats properties, ensuring every design accounts for local building characteristics and Thames alluvium ground conditions. Our most recent project in the area was a single storey extension completed in Dec 2025.
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 Dartford
Single storey extension
Single storey extension
Knock-through
Loft conversion
Single storey extension
Send us your plans
A fixed price before you commit. No obligation, no chasing.
What people say
Other Areas in Kent
Frequently Asked
It depends on the size and complexity of your project, so we don't publish a price range for Dartford. 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 Dartford's Victorian - modern properties. Our engineers aim to understand the specific requirements of your property from Brick terraces, flats construction, ensuring calculations that respect the original structure while meeting modern standards.
Dartford typically has Thames alluvium. Alluvium with peat layers. We factor these conditions into our foundation designs, which may affect the depth and type of foundations required.
On a full plans application, Dartford Borough 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 Dartford and the surrounding Kent 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 Dartford's unique characteristics helps us deliver precise structural solutions.
Structural engineering services in Dartford
Professional Structural Calculations for Kent Properties
Your project deserves engineers who know Kent inside and out. We work extensively with the area’s building heritage – Victorian → modern constructions using Brick terraces, flats. Our familiarity with Dartford Borough Council processes means fewer queries and fewer complications for your project.
Structural Calculations Tailored to Kent Properties
Every area has its challenges. In Kent, we regularly work with Thames alluvium, which requires specific foundation design approaches. Alluvium with peat layers 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 Kent’s Property Types
From Suburban semis to riverside flats, we’ve worked on projects throughout Kent. Whether your property sits near Dartford Crossing; Crayford Marshes or benefits from proximity to Southeastern; Dartford Loop; A2, we understand the local context.
Our established relationship with Dartford Borough Council building control helps expedite your project. We consistently deliver calculations that meet their standards, minimising delays and resubmissions.
Structural Engineering Services Throughout Kent
We provide comprehensive structural calculations across Kent (population: 105 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
Structural Calculations Quote for Your Kent Project
Ready to move forward? Contact PorthouseDean for structural engineering services in Kent. We provide clear, competitive quotes within one business day.
Ready to get started?
Send us your plans and you'll have a clear, fixed price before you commit. Or give us a call.
