RSJ & Wall Removal
RSJ beam calculations for knock-throughs, bi-fold door openings and chimney breast removals in Southampton homes, from Victorian terraces in Freemantle to post-war semis in Sholing.
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Southampton & Hampshire
Structural Engineer Southampton
Looking for a structural engineer Southampton builders and homeowners trust? We provide fixed-fee structural calculations from £245 for wall removals, loft conversions, extensions and steel frame design across Southampton and Hampshire. Building Control-ready within 24–72 hours.
- ✓ Residential & commercial: domestic knock-throughs to portal frames and steel frame buildings
- ✓ Fixed fee upfront, confirmed in writing before any work begins
- ✓ Building Control support included, we answer inspector queries as part of the service
- ✓ 24–72 hour turnaround on most residential Southampton projects
Get a Quote
We respond to Southampton enquiries within 24 hours.
Structural Engineer Southampton: Costs & Fees (2026)
Most jobs in Southampton cost between £245 and £1,500. Here are the 2026 typical fees for a domestic or commercial structural engineer Southampton residents and builders use. All fees are fixed and confirmed before we start.
| Service | Typical Fee (Southampton) | What Is Included |
|---|---|---|
| Single RSJ beam calculation | £245 to £450 | Beam sizing, padstone design, masonry checks |
| Load bearing wall removal (engineer fee only) | £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 |
| Structural inspection and defect report | £400 to £900 | Cracks, movement, subsidence, purchase reports |
| Site visit (when required) | £250 to £400 | Most residential jobs handled remotely |
Load bearing wall removal in Southampton from £300. Most kitchen knock-throughs are turned around the next working day. See our full guide to wall removal costs for the complete project budget including builder and steel.
Structural Engineer Southampton Services
We cover residential and commercial structural engineering across Southampton and Hampshire. From a single RSJ beam to a full new build steel frame design.
Loft Conversions
Floor joists, steel ridge beams and dormer structures for loft conversions across Southampton. We design structural packs for hip-to-gable, dormer additions and mansard conversions.
Home Extensions
Structural packs for rear and side extensions across Southampton and Hampshire, including foundations, roof structures and steel beams over wide openings.
Steel Frame & Portal Frame
Structural design for steel frame buildings and portal frames across Southampton and Hampshire. Suitable for commercial extensions, warehouses and agricultural buildings requiring a full new build structural design.
Timber Calculations
Sizing rafters, purlins and floor joists to British Standards and Eurocodes. Southampton has a mix of older housing stock with thin original timbers. We check existing members and design replacements or upgrades.
Structural & Defect Reports
Defect reports for cracks, movement or settlement in Southampton properties. Pre-purchase structural assessments and reports on subsidence, heave or historic alterations. Site visit available across Hampshire.
How It Works
A straightforward four-step process to get your Southampton project Building Control-ready.
1
Send Your Details
Email your plans, a sketch with dimensions or photos of the site. Estate agent floor plans are fine to start. We review the scope and clarify anything we need.
2
Fixed Fee Confirmed
We respond with a fixed price in writing before any work begins. No hourly rates or hidden extras. You know the exact cost upfront.
3
Calculations Delivered
Structural calculations and drawings produced within 24–72 hours. Most Southampton domestic jobs turned around in two working days. Priority turnaround available.
4
Build Support
We answer Building Control queries and site questions from your builder. This support is included in the fee at no extra charge for all Southampton projects.
Why Work With Us?
We focus on practical, cost-effective structural engineering for Southampton homeowners and developers.
Fixed fees, no surprises
We agree the scope and fee before we start. You will not face unexpected bills halfway through the design. Everything is in writing before we touch the calculations.
Fast turnaround
Builders do not like waiting. Most Southampton domestic structural designs are ready within 24–72 hours of confirmation. Priority delivery available if your build is already under way.
Building Control support included
If Southampton Building Control or a private approved inspector has questions about our calculations, we answer them directly. This is part of the standard service, at no extra charge.
What Clients Say
Feedback from recent clients across Southampton and Hampshire.
★★★★★
"Straightforward and easy to deal with. The calcs for our extension in Bassett were spot on and passed Building Control without issue."
James T, Bassett, Southampton
★★★★★
"Needed a quick beam calculation for a kitchen knock-through in Woolston. Sorted in 48 hours. Excellent service, very clear drawings."
Sarah H, Woolston, Southampton
★★★★★
"Our builder was happy with the steel connection details. Good practical engineers who know what they are doing. Will use again."
Mike D, Totton, Hampshire
Areas We Cover Near Southampton
We provide structural engineering services across Southampton and the wider Hampshire region.
●Southampton
●Eastleigh
●Winchester
●Romsey
●Chandler's Ford
●Hedge End
●Totton
●Botley
●Fareham
●Gosport
●Portsmouth
●Bursledon
●New Forest
●Lyndhurst
●Ringwood
●Hythe
FAQs: Structural Engineer Southampton
Common questions from Southampton homeowners, builders and developers.
How much does a structural engineer cost in Southampton?
Most residential structural engineering jobs in Southampton cost between £245 and £1,500. A single RSJ beam calculation starts from £245. A loft conversion structural package is £395 to £1,200. A home extension is £600 to £1,500. You always get a fixed fee confirmed before we start. No hourly rates and no surprise invoices.
Do I need a structural engineer to remove a wall in Southampton?
Yes. Southampton Building Control require structural calculations before approving any load bearing wall removal. A builder's estimate of what beam to use is not accepted. You need a qualified structural engineer Southampton Building Control will recognise. We design the beam, check the padstones and produce the full calculation pack.
Can you design steel frames and portal frames in Southampton?
Yes. We design steel frame buildings and portal frames for commercial, industrial and agricultural projects across Southampton and Hampshire. We produce the full structural design pack including column and rafter sizing, connections, base plates and foundation loads. This covers the "steel frame building engineer Southampton" and "portal frame engineer Southampton" queries we commonly receive.
Do you carry out cut and fill calculations in Southampton?
Yes. We provide cut and fill calculations for new build projects, retaining walls and basement structures across Southampton and Hampshire. If you are dealing with a sloped site or a new build with split-level foundations, send us your drawings and we will confirm what is involved.
How long do structural calculations take in Southampton?
Most Southampton residential jobs are ready within 24 to 72 hours. A single RSJ calculation is typically done the next working day. Loft conversions and extensions take 2 to 3 working days. Priority turnaround is available if your build is already under way.
Will Southampton Building Control accept your calculations?
Yes. All our work is calculated to Eurocodes and the UK National Annexes. We present calculations in a standard format recognised by Southampton City Council Building Control and private approved inspectors. If the inspector asks for clarification we answer their questions directly as part of the service.
Do you need to visit my property in Southampton?
Not always. If you have clear architectural plans or sketches with dimensions we can usually work remotely, which keeps the cost lower. A site visit is sometimes necessary for complex loading, unusual ground conditions or defect investigations. Site visits are £250 to £400 and we will always advise this upfront.
Do you cover Eastleigh, Fareham and the wider Hampshire area?
Yes. We cover all of Hampshire including Eastleigh, Winchester, Romsey, Fareham, Gosport, Portsmouth, Chandler's Ford, Hedge End, Botley, Totton, the New Forest, Ringwood and Hythe. If you are unsure whether we cover your area, send your postcode and we will confirm straight away.
Request a Quote for Your Southampton Project
Fill in the form and we will review your details and send a direct fixed price. We are engineers, not salespeople.
Phone
Email
Response Time
Typically within 24 hours
Service Area
Southampton, Winchester, Eastleigh, Romsey, Fareham, Gosport, Portsmouth, Chandler's Ford, Hedge End, Totton, Botley, New Forest and the wider Hampshire region.
Most residential projects are handled remotely from your drawings. No site visit needed. If a visit is required, we include this clearly in your quote.
Get Started with a Structural Engineer Southampton Today
Fixed fees, fast turnaround and Building Control-ready calculations every time. Call us on 07359 267907 or fill in the form above and we will come back to you the same day.
- Head Office: Corwell Lane, Uxbridge, England, UB8 3DE.
- 07359 267907
- info@structuralengineercalcs.com
- Company No: 12653163