Southampton & Hampshire
Looking for a structural engineer Southampton builders and homeowners trust? We provide fixed-fee structural calculations from £245 for wall removals, loft conversions, extensions, steel frame buildings, industrial floor slab designs and new builds across Southampton and Hampshire. Building Control-ready within 24 to 72 hours.
Southampton has a mix of Victorian terraces in Freemantle and Shirley, post-war semis in Sholing and Bitterne, and modern commercial and industrial properties across the docks corridor and Hedge End business parks. We design the structure behind all of these: domestic knock-throughs, full portal frame buildings and everything between.
We respond to Southampton enquiries within 24 hours.
Most structural engineering jobs in Southampton cost between £245 and £3,000. All fees are fixed and confirmed before we start.
| Service | Typical Fee (Southampton, 2026) | What Is Included |
|---|---|---|
| Single RSJ beam calculation | £245 to £450 | Beam sizing, padstone design, masonry checks |
| Load bearing wall removal | £300 to £600 | Full Building Control calculation pack |
| Loft conversion structural design | £395 to £1,200 | Floor joists, ridge beam, dormer supports |
| Home extension structural calculations | £600 to £1,500 | Beams, foundations, roof structure |
| Steel frame and portal frame design | £800 to £3,000 | Full structural design pack, connections, base plates |
| Industrial concrete floor slab design | £600 to £2,500 | Slab thickness, reinforcement, joint and subbase spec |
| New build structural design | £600 to £2,500 | Frame design, ground beams, foundation layout |
| Structural inspection and defect report | £400 to £900 | Cracks, movement, subsidence, pre-purchase reports |
We cover residential and commercial structural engineering across Southampton and Hampshire, from single RSJ beams to full portal frame buildings.
Steel beam calculations for knock-throughs, bi-fold door openings and chimney breast removals across Southampton from £245. We check load paths, size the beam, design padstones and produce a Building Control-ready pack. Wall removal guide
Ridge beams, floor joists and dormer framing for loft conversions across Southampton from £395. Victorian terraces in Freemantle and Shirley and 1930s semis in Bitterne and Woolston are the most common project types.
Structural packs for rear and side extensions from £600, covering foundations, steelwork and roof structure. All packs are Building Control-ready for Southampton City Council.
Full structural design for steel frame buildings and portal frames across Southampton and Hampshire. Column sizing, rafter design, connections, base plates and foundation loads included. From £800.
Structural design for industrial concrete floor slabs for warehouses, workshops and commercial units across Southampton, Portsmouth and Hampshire. Reinforcement layout, joint spacing and subbase spec all included from £600.
Timber and steel frame designs, ground beam and foundation layouts for self-builds and residential developments across Southampton and Hampshire. Building Control calculation packs included from £600.
Two specialist services that set our Southampton offering apart from most residential-only engineering practices.
As a steel frame engineer Southampton developers and commercial clients use, we design portal frames, commercial extensions, agricultural buildings and warehouse structures across the wider Hampshire area. The design pack covers column sizing, rafter design, connection details, base plates and foundation loads. You get everything needed for Building Control approval and steel fabrication in a single document. Steel frame design starts from £800 and is typically ready within 5 to 7 working days.
We design industrial concrete floor slabs for warehouses, workshops, vehicle workshops and light commercial premises across Southampton, Portsmouth and the surrounding Hampshire area. The structural design covers slab thickness, reinforcement layout, construction joint spacing, subbase specification and bearing capacity checks. Industrial floor slab design starts from £600 and is formatted for Building Control submission and your groundworks contractor.
Any work that changes how your Southampton property carries load requires a structural engineer. Here is what that covers and what our calculations include.
Structural alterations in Southampton include load bearing wall removals, chimney breast removals, new door or window openings cut into load-bearing walls, floor alterations, roof height changes and any work that modifies the load path through a building. Southampton Building Control requires a structural engineer's calculation pack before approving any of these. Structural alterations calculations start from £300 and are typically ready in 24 to 72 hours for standard residential jobs.
Victorian terraces in Freemantle, Shirley and Bevois Valley have solid brick walls with lower mortar strengths that affect padstone sizing. Post-war semis and terraces in Sholing, Bitterne and Thornhill sometimes used lightweight block inner leaves or unusual floor constructions that require checking before we specify a beam. New-build properties in Hedge End and Chandlers Ford have modern timber frames where alterations need different structural approaches entirely. We identify the construction type from your photos before confirming the fixed fee.
A straightforward five-step process from enquiry to Building Control submission.
A sketch, photos or architect plans. Anything helps us start.
We confirm a clear fixed fee in writing before any work begins.
We design the beams, joists, padstones and connections required.
A clean Building Control-ready PDF for your builder and inspector.
We answer Building Control queries included in the fixed fee.
Recent feedback from homeowners and builders across Southampton and Hampshire.
"Needed RSJ calculations for a kitchen knock-through in Bassett. Clean drawings, fast turnaround and Building Control approved without any queries."
James T, Bassett, Southampton
"Our steel frame design for a workshop in Hedge End was sorted quickly. The engineer understood what the fabricator needed and the drawings were ready in two days."
Paul M, Hedge End, Hampshire
"Loft conversion in Woolston needed a ridge beam and new joists. Delivered on time, builder was happy and the price was exactly as quoted."
Sarah H, Woolston, Southampton
We provide structural engineering across Southampton and the wider Hampshire region. Most work is handled remotely from drawings and photos.
Common questions from Southampton homeowners, builders and developers.
Most residential structural engineering jobs in Southampton cost between £245 and £1,500. A single RSJ beam calculation starts from £245. A load bearing wall removal is £300 to £600. A loft conversion structural design is £395 to £1,200. A home extension is £600 to £1,500. Steel frame and new build projects are quoted individually. All fees are fixed and confirmed before we start. Full guide: structural engineer costs UK.
Yes. We design steel frame buildings and portal frames for commercial, industrial and agricultural projects across Southampton and Hampshire. Our structural design packs include column sizing, rafter design, connections, base plates and foundation loads. Steel frame design starts from £800.
Yes. We design industrial concrete floor slabs for warehouses, workshops and commercial units across Southampton, Portsmouth and Hampshire. Slab thickness, reinforcement layout, joint spacing and subbase specification are all included in the structural pack. Industrial floor slab design starts from £600.
Yes. We provide structural design for new build residential and commercial projects across Southampton. This includes timber and steel frame designs, ground beam and foundation layouts, and full Building Control calculation packs from £600.
Yes. Southampton Building Control requires structural calculations before approving any load bearing wall removal. A builder cannot provide these. You need a qualified structural engineer who can design the beam, check the padstones and produce the full Building Control pack. RSJ calculations start from £245.
RSJ beams and wall removals are ready in 24 to 72 hours. Loft conversions and extensions take 5 to 7 working days. Steel frame and new build packs take 5 to 10 working days depending on complexity. All turnarounds are confirmed in writing with your fixed fee quote.
Yes. We cover all of Hampshire including Eastleigh, Winchester, Romsey, Fareham, Gosport, Portsmouth, Chandlers Ford, Hedge End, Botley, Totton, the New Forest, Ringwood and Hythe. Most projects are handled remotely from drawings and photos.
Yes. All our work is calculated to Eurocodes and UK National Annexes. Our packs are formatted for Southampton City Council Building Control and private approved inspectors across Hampshire. If the inspector raises queries we respond directly as part of the service at no extra charge.
Fixed-fee structural calculations from £245. Building Control-ready in 24 to 72 hours. Fill in the form and we will reply the same working day.
Fixed fees, fast turnaround and Building Control-ready calculations every time. Call us on 07359 267907 or fill in the quote form above and we will come back to you the same working day.
