Southampton and 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 concrete floor slab designs and new build structural engineering 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, industrial floor slabs, new build frames and everything in 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. No hourly rates.
| 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 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.
As a steel frame engineer Southampton developers and commercial clients rely on, we design portal frames, commercial extensions, agricultural buildings and warehouse structures across Southampton and the wider Hampshire area.
The structural design pack for a steel frame building in Southampton covers column sizing, rafter design, connection details, base plates and foundation loads. You receive everything needed for Building Control approval and steel fabrication in a single Building Control-ready document. We design steel frame buildings for warehouses, commercial units, agricultural buildings, sports halls and bespoke steel extensions across Southampton and Hampshire.
Steel frame design starts from £800 and is typically ready within 5 to 7 working days from receipt of drawings or a site layout. The design is formatted for Southampton City Council Building Control or your private approved inspector and includes the calculation report your structural inspector expects to see alongside the drawings.
A complete steel frame engineering pack for Southampton projects includes: column sizing and verification to Eurocode 3, rafter and purlin design, frame geometry analysis including wind and imposed loading for the Hampshire coastal location, connection details for column bases, eaves and ridge, base plate design and foundation load summary. We also include temporary works notes for the erection sequence where these are needed by the steel fabricator.
Hampshire's coastal and near-coastal locations have wind exposure considerations that affect the design of steel frame buildings differently from inland sites. We apply the correct wind load zone for your specific Southampton or Hampshire site before confirming the final column and rafter sizes. This is particularly relevant for sites near the Solent, in Hedge End or in the Fareham area where wind exposure is higher than the national default.
We design industrial concrete floor slabs for warehouses, workshops, vehicle workshops and light commercial premises across Southampton, Portsmouth and the surrounding Hampshire area. Industrial concrete floor slab design starts from £600.
An industrial concrete floor slab design in Southampton is not simply specifying a thickness and reinforcement bar. A proper structural design covers the slab thickness derived from the loading requirements and the subgrade bearing capacity, the reinforcement layout including bar diameters and spacing, the construction joint spacing and joint type (saw-cut, formed or armoured), the subbase specification including thickness and compaction requirements, and bearing capacity checks where the slab sits on made ground or variable fill.
Southampton and the Hampshire coastal strip have variable ground conditions below industrial sites. The docks area and adjacent commercial zones have significant depths of made ground and historical reclamation fill. Hedge End and the M27 corridor industrial estates sit on firmer natural ground but with localised variation. We ask for ground investigation data or a desk study before finalising the floor slab design so the specification reflects the actual ground below your site, not a generic assumption.
Industrial concrete floor slab design for Southampton projects starts from £600 and is typically ready in 5 to 7 working days from receipt of the site layout, loading requirements and any ground investigation data. The design pack includes a calculation report and a slab layout drawing showing reinforcement zones, joint positions and slab thicknesses. The pack is formatted for submission to Southampton City Council Building Control or your private approved inspector.
We cover industrial concrete floor slab design across Southampton, Portsmouth, Eastleigh, Fareham, Gosport, Hedge End, Chandlers Ford and the wider Hampshire commercial and industrial area. Industrial floor slab design is often commissioned alongside a steel frame building design, and we offer a combined package for clients commissioning both elements at the same time.
We provide structural design for new build residential and commercial projects across Southampton and Hampshire. Timber and steel frame designs, ground beam layouts and full Building Control calculation packs from £600.
A new build structural engineering pack for a Southampton project covers the structural frame design, whether timber or steel. For a timber frame new build this includes the wall panel schedule, floor joist layout, truss or rafter design, and any steel elements at ground floor openings or where large spans need to be accommodated. For a steel frame new build it covers the column and beam layout, connections and base plates, and the interface between the steel frame and the masonry or cladding.
Ground beam and foundation design is included for all new build structural packs where the ground conditions are known. Southampton and Hampshire have varied ground conditions, from the firm chalk downs in the Winchester area to the clays and made ground nearer the coast. We advise on the level of ground investigation needed before finalising foundation design, and can work from an existing ground investigation report or desk study where one has already been commissioned.
New build structural engineering fees in Southampton start from £600 for a straightforward residential self-build and increase based on the size, construction type and complexity of the project. A two-storey timber frame house is typically £800 to £1,500. A bespoke steel frame design or a project with complex geometry is quoted individually after an initial review of drawings. All new build structural design packs are Building Control-ready and include a calculation report alongside the structural drawings.
We cover new build structural engineering across Southampton, Eastleigh, Winchester, Romsey, Chandlers Ford, Hedge End and the wider Hampshire area. We work with self-build clients directly and alongside architects and project managers on larger schemes. If you are at an early design stage, we can provide a preliminary structural review and fee estimate from sketch proposals before full drawings are available.
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 as part of 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. For Portsmouth and Southsea projects, see our Portsmouth structural engineer page.
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.
We do not charge hourly rates for Southampton structural engineering projects. All work is priced on a fixed-fee basis, confirmed in writing before any work begins. The minimum charge for a structural calculation in Southampton is £245 for a single RSJ beam design. There is no hourly rate, no call-out charge and no minimum visit fee. The fixed fee covers the full calculation, the structural drawing and any Building Control inspector queries that arise.
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 and is typically ready in 5 to 7 working days.
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. Industrial concrete floor slab design starts from £600. For projects on made ground near the Southampton docks or Solent waterfront, we advise on ground investigation requirements before finalising the design.
Yes. We provide structural design for new build residential and commercial projects across Southampton and Hampshire. This includes timber and steel frame designs, ground beam and foundation layouts, and full Building Control calculation packs. New build structural engineering in Southampton starts 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 and are usually ready the next working day.
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. For Portsmouth and Southsea, see our dedicated Portsmouth structural engineer page. 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.
