Trusted structural calculations for extensions, lofts, and renovations across Knowsley.
Based in Manchester, with engineers around the country for site visits. We've worked extensively across Merseyside and know Knowsley well — the Post-War → Modern Post-war semi-detached/terraces, new-build housing estates, industrial units, the party wall situations that come with them.
More importantly, we know how Knowsley 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 Knowsley, 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 Knowsley. Tell us about your project and you get a clear, fixed-fee quote before you commit.
Yes, we are very experienced with the post-war housing stock common across Kirkby and Huyton, providing cost-effective designs for extensions and loft conversions.
The prevalent glacial clay is generally good for building, but we always check for any localised issues or made ground that might require a modified foundation design.
On a full plans application, Knowsley 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 for all parts of Knowsley, including Prescot, Kirkby, Huyton, Halewood, and Whiston.
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 Knowsley's unique characteristics helps us deliver precise structural solutions.
Structural Engineering Excellence in Merseyside
Choosing the right structural engineer means finding someone who truly understands your area. We specialize in Merseyside properties, working regularly with everything from Post-War → Modern homes built with Post-war semi-detached/terraces, new-build housing estates, industrial units. This local expertise means our designs are written to satisfy Knowsley Council building regulations.
Successful structural projects begin with proper foundation design. Merseyside’s typical Glacial till over sandstone, with some influence from coal measures presents specific engineering requirements. Underlain by Sherwood Sandstone and the Pennine Coal Measures Group. Much of the area is covered by a blanket of glacial till. We incorporate this geological knowledge throughout our calculations, ensuring safe, durable foundations for extensions, conversions, and renovations.
Predominantly 20th-century housing, including large post-war estates and modern developments This diversity means we’ve developed expertise across all property types – whether you’re extending a period property near Knowsley Hall & Safari Park, Shakespeare North Playhouse (Prescot) or renovating a modern home with easy access to M62 / M57 interchange, Kirkby, Huyton, and Prescot railway stations.
We maintain strong working relationships with Knowsley Council building control, streamlining approvals for your project. Our calculations are approved by building control, or you get a refund.
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
Request Your Free Merseyside Structural Engineering Quote
Starting your project? Get in touch with PorthouseDean for structural calculation pricing in Merseyside. You’ll have a detailed, fixed-fee quotation before you commit.
Send us your plans and you'll have a clear, fixed price before you commit. Or give us a call.