Home Extension Structural Design Manchester
A reliable Home Extension Structural Design Manchester service is essential for any rear, side, or wrap-around extension. Every extension needs the correct steel beams, foundations, roof supports, and full structural calculations for Building Control. We help homeowners and builders across Manchester with fast, safe RSJ design, foundation sizing, and a complete structural pack delivered within 24 to 48 hours. You can also see our national home extension structural design service page if you are comparing options across the UK. If you need a local structural engineer Manchester for your extension, we can guide you from first idea through to final Building Control approval.
What this service includes
Complete home extension structural package
Our extension package includes everything needed for safe construction and Building Control approval. You can also read our steel beam calculation guide for more beam information.
- Full structural calculations for home extension
- Steel beam design for extensions
- Load assessment for walls, floors, and roofs
- Extension RSJ design Manchester
- Foundation design for new walls and columns
- Roof structure design
- Padstone and bearing details
- Lintel and opening support
- Stability checks
- Structural report for Building Control
- Direct support for your builder
Why extensions in Manchester need structural design
Manchester has mixed property types: modern homes, older terraces, 1930s semis, and Victorian houses. Each reacts differently to new openings, additional loads, and new foundations. A good extension structural engineer Manchester keeps the extension safe and within Building Regulations. If your project includes a knock through, our load bearing wall removal page explains that process in more detail.
Common issues homeowners face
- Builder needs the RSJ size before quoting
- Unsure what foundations the extension needs
- Building Control asks for structural calculations
- Bi-fold doors need a long, strong beam
- Concern about roof spread or sag
- Unsure if internal walls can be removed
We provide answers quickly so your extension can move forward with confidence.
Our simple 24–48hr process
Straightforward engineering flow
Fast, clear, and easy for everyone involved.
Steel beams and RSJs for extensions
What we calculate
Most extensions need multiple beams, especially when creating open-plan layouts. We design:
If your builder says they need the beam sizes urgently, we can calculate them within 24–48 hours.
Foundation design
Getting the right foundation size
Every extension needs suitable foundations. We design:
- Strip foundations
- Trench-fill foundations
- Pad foundations for columns
- Foundation depth for Manchester soil conditions
A safe foundation avoids settlement, cracking, or Building Control delays.
Roof structure design
Roof options we design
Extensions often need:
- Flat roof joist design
- Warm or cold roof setups
- Pitched roof structure
- Ridge beams
- Valley beams
- Rafter sizing
- Lintel support
We also check how the new roof connects to the existing house. If your plans include changes to the loft as well, our loft conversion structural engineer help page is a useful guide.
Building Control requirements
What Building Control expect
For any extension they need:
- Structural calculations
- RSJ size and grade
- Foundation design
- Roof structure design
- Deflection checks
- Stability confirmation
- Load paths and layout
Our structural pack satisfies everything.
You can view government guidance here: gov.uk/building-regulations-approval
Price guide
Typical fees in Manchester:
Small extension
£300 to £450Medium open-plan extension
£450 to £650Large wrap-around extension
£650 to £950Complex foundation or roof design
£950 to £1,200Payment Terms: You pay 50 percent upfront, balance on completion.
If you want the cost of extension structural engineer Manchester, send your plans and we will confirm the price straight away.
Local Manchester extension examples
Real projects we complete often
If your builder needs beam sizes for extension, we can help today.
Why choose us
- Fast 24–48hr turnaround
- Clean, simple calculations
- Local Manchester experience
- Direct engineer contact
- Fair fixed fees
- Builder-friendly layout
- Approved by Building Control
Safe extension design you can rely on.
If you are outside Greater Manchester, you can also check our structural engineer near me page to find help in your area.
Areas we cover
FAQs
- Head Office: Corwell Lane, Uxbridge, England, UB8 3DE.
- 07359 267907
- info@structuralengineercalcs.com
- Company No: 12653163