Trusted structural calculations for extensions, lofts, and renovations across Liverpool.
Based in Manchester, with engineers around the country for site visits. We've worked extensively across Merseyside and know Liverpool well — the Georgian → Modern Red brick terraces, Georgian townhouses, sandstone civic buildings, dockside apartments, the party wall situations that come with them.
More importantly, we know how Liverpool City Council’s building control team operates and we write our calculations to match. That saves time on site and avoids queries coming back.
PorthouseDean provides structural engineering for extensions, knock-throughs, loft conversions, and two-storey extensions in Liverpool, and has delivered 9,000+ projects across England and Wales since 2012.
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.
Every job runs through the same process, so every customer gets the same three answers.
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.
Pick how fast you need it, and pay less if you can wait. You get a date to work back from.
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.
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.
No extras for building control queries.
A fixed price before you commit. No obligation, no chasing.
It depends on the size and complexity of your project, so we don't publish a price range for Liverpool. 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 older properties. We frequently design for Victorian and Georgian homes, specifying sensitive structural interventions that meet modern building regulations.
Liverpool benefits from strong sandstone bedrock. This generally allows for standard foundation designs, though we always assess site-specific conditions like made ground or proximity to basements.
On a full plans application, Liverpool City 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 cover all districts within Liverpool and the wider Merseyside area, and you choose your delivery date.
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.
Understanding Liverpool's unique characteristics helps us deliver precise structural solutions.
Our team brings deep local knowledge to every project. We understand Merseyside’s unique building heritage – from Georgian → Modern properties with their characteristic Red brick terraces, Georgian townhouses, sandstone civic buildings, dockside apartments construction. This expertise matters when calculating loads, designing foundations, and ensuring your project meets Liverpool City Council building regulations.
Foundation design in Merseyside requires careful attention to local geology. The area’s Glacial till and made ground over solid Sherwood Sandstone demands specific engineering approaches. Much of the city is built on the Sherwood Sandstone Group, a strong bedrock providing excellent bearing capacity, often covered by a layer of glacial till (clay). We factor these ground conditions into every design, whether you’re planning an extension, loft conversion, or structural modification.
Comprehensive Knowledge of Merseyside Properties
Merseyside’s housing includes High concentration of Victorian terraces, Georgian townhouses, and modern city-centre flats, and we’ve worked across this entire spectrum. Your project might be close to Royal Albert Dock, Liverpool Cathedral, Anfield Stadium, The Three Graces or positioned for excellent transport links via Liverpool Lime Street Station, M62, John Lennon Airport, Mersey Ferries – either way, we know the area.
Years of working with Liverpool City Council building control means we understand exactly what they need. Our calculations consistently pass first-time review, keeping your project on schedule.
We provide structural engineering services for all types of residential projects across Merseyside:
• 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 Started With Your Merseyside Structural Calculations
Planning your extension or conversion? Reach out to PorthouseDean for structural calculation costs in Merseyside. You’ll have a clear, fixed-price quote before you commit.
Send us your plans and you'll have a clear, fixed price before you commit. Or give us a call.