Trusted structural calculations for extensions, lofts, and renovations across Merseyside.
Based in Manchester, with engineers around the country for site visits. We've worked extensively across Merseyside — the Georgian → Contemporary Brick terraces, post-war semis, modern apartments, sandstone buildings, the party wall situations that come with them.
More importantly, we know how Liverpool, Wirral, Sefton, Knowsley, St Helens Councils’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 Merseyside, 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.
Select your area below for local project data and a quote tailored to your location.
It depends on the size and complexity of your project, so we don't publish a price range for Merseyside. Tell us about your project and you get a clear, fixed-fee quote before you commit.
Absolutely. We regularly design for Victorian terraces, Georgian townhouses, and inter-war semis, specifying sympathetic structural solutions that comply with current building standards.
The area has variable ground, from sandy coastal soils in Sefton to heavy glacial clays. We analyse these conditions to design appropriate foundations, ensuring stability and longevity.
On a full plans application, the 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 every part of Merseyside — including Liverpool, Wirral, Sefton, Knowsley, and St Helens — 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 Merseyside's unique characteristics helps us deliver precise structural solutions.
Professional Structural Calculations for Merseyside Properties
Your project deserves engineers who know Merseyside inside and out. We work extensively with the area’s building heritage – nan constructions using nan. Our familiarity with nan processes means fewer queries and fewer complications for your project.
Structural Calculations Tailored to Merseyside Properties
Every area has its challenges. In Merseyside, we regularly work with nan, which requires specific foundation design approaches. Dominated by Triassic Sherwood Sandstone and Mercia Mudstone groups, widely overlain by glacial till (boulder clay) and coastal/estuarine deposits. Our structural engineers account for these local conditions in every calculation, ensuring your extension, loft conversion, or structural alteration is built on solid foundations.
From Vast mix of Victorian terraces, suburban semis, coastal homes, city flats, we’ve worked on projects throughout Merseyside. Whether your property sits near nan or benefits from proximity to M62, M53, M57, M58 motorways, Merseyrail network, we understand the local context.
Our established relationship with nan building control helps expedite your project. We consistently deliver calculations that meet their standards, minimising delays and resubmissions.
Coverage Across Merseyside
Operating throughout Merseyside and surrounding areas (population: 1.4m), 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
Structural Calculations Quote for Your Merseyside Project
Ready to move forward? Contact PorthouseDean for structural engineering services in Merseyside. We provide clear, competitive quotes within one business day.
Send us your plans and you'll have a clear, fixed price before you commit. Or give us a call.