Home Extension Structural Design Wilmslow
(Building Control Approved)
Home Extension Structural Design Wilmslow services are essential for homeowners across Wilmslow and Cheshire who want larger kitchens, open-plan living spaces, or rear extensions. With many 1930s semis and modern detached homes in the area, careful engineering is needed to connect the new structure to the existing house. We design the full structural scheme so your extension is safe, compliant, and ready for Building Control.
Why You Need Home Extension Structural Design Wilmslow
Building an extension is not just about adding space. The biggest challenge is how the new structure joins the original house.
Wilmslow sits on Cheshire clay, which shrinks in dry weather and swells when it’s wet. When extending a 1930s semi or a modern detached home, differences in ground movement between the old and new foundations can lead to cracking or settlement if the design is not handled properly.
A safe extension needs a clear structural plan for the foundations, walls, beams, and roof supports.
Our Solution for Wilmslow Properties
We design the complete structural package required for a safe, long-lasting home extension.
Key Benefits
- Fast 3–5 working day turnaround
- 100 percent Building Control compliant
- Clear plans your builder can follow
Your design includes
- Strip or trench fill foundations sized for Cheshire clay
- Masonry or timber wall design
- Steel beams and box frames for openings into the existing house
- Roof support design for flat or pitched extensions
- Load calculations and padstone details
Everything is delivered in a simple pack your builder can follow on site.
Structural Challenges in Wilmslow
Wilmslow’s clay soil behaves differently across the seasons. In dry periods the clay can shrink, causing minor movement. In winter the ground can swell and push against new foundations. This makes foundation depth and stiffness important for preventing future cracking.
1930s semis
Often have shallower original foundations. New extensions usually need deeper foundations to avoid differential settlement.
Modern detached homes
Better foundation depth, but many have large rear openings, meaning new steel frames are often needed to support increased spans.
We tailor the design so the extension ties neatly into the existing structure without overloading older walls.
Recent Projects near Wilmslow
Project 1
Rear kitchen extension for a 1930s semi close to The Carrs Park. Designed deeper foundations and a steel box frame for the new open-plan layout.
Project 2
Single-storey extension in a modern detached house near Fulshaw Park. Provided the foundations, roof beams, and wall design with clear builder notes.
What Wilmslow Clients Say
"Great experience. The extension design for our Wilmslow home was clear and approved first time."
– Client in Wilmslow
"They handled our open-plan extension near The Carrs Park with a fast turnaround and very clear drawings."
– Client in Cheshire
FAQ
Planning an Extension in Wilmslow?
Get your structural design completed quickly so your extension can move ahead without delays.
Call 07359 267907 or email info@structuralengineercalcs.com.
If you need support anywhere in Wilmslow or Cheshire, see our main Wilmslow structural engineer page.
- Head Office: Corwell Lane, Uxbridge, England, UB8 3DE.
- 07359 267907
- info@structuralengineercalcs.com
- Company No: 12653163