RSJ & Wall Removal Cardiff
Steel beam calculations for kitchen knock-throughs across Cardiff from £245. Victorian terraces in Roath, Canton and Pontcanna are our most frequent Cardiff jobs. Building Regulations-ready packs for Cardiff Council.
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Cardiff & South Wales
Structural Engineer Cardiff
Looking for a structural engineer Cardiff homeowners and builders trust? We provide fixed-fee structural calculations from £245 for wall removals, loft conversions, extensions and structural alterations across Cardiff and South Wales. Building Regulations-ready for Cardiff Council and all South Wales local authorities within 24 to 72 hours.
Cardiff's inner suburbs are built on Victorian and Edwardian terraced housing. Roath, Cathays, Canton and Pontcanna have street after street of solid brick terraces where internal walls carry floor joists and sometimes a roof purlin. Whitchurch and Rhiwbina have 1930s semis with longer spans and different beam requirements. We check the actual construction before specifying anything.
Get a Quote
We respond to Cardiff enquiries within 24 hours.
Structural Engineer Cardiff: Costs and Fees (2026)
Most structural engineering jobs in Cardiff cost between £245 and £1,500. All fees are fixed and confirmed before we start.
| Service | Typical Fee (Cardiff, 2026) | What Is Included |
|---|---|---|
| RSJ beam calculation Cardiff | £245 to £450 | Beam sizing, padstone design, masonry checks |
| Load bearing wall removal | £300 to £600 | Full Building Regulations calculation pack |
| Structural alterations Cardiff | £300 to £900 | Wall removals, chimney breasts, new openings |
| Loft conversion structural design | £395 to £1,000 | Ridge beam, floor joists, dormer supports |
| Home extension structural calculations | £500 to £1,500 | Beams, foundations, roof structure |
| Structural inspection and report | £400 to £900 | Cracks, movement, pre-purchase assessments |
Load bearing wall removal in Cardiff from £300. Most kitchen knock-throughs are ready the next working day. See our full guide to wall removal costs.
Structural Engineer Cardiff Services
We cover all common residential structural engineering across Cardiff and the surrounding area.
Loft Conversions Cardiff
Ridge beams, floor joists and dormer framing for loft conversions across Cardiff from £395. Very popular in Pontcanna, Roath and Penarth where adding a loft room is more cost-effective than moving.
Extensions Cardiff
Structural packs for rear and side extensions from £500. All packs are Building Regulations-ready for Cardiff Council, Vale of Glamorgan Council and surrounding South Wales authorities.
Structural Alterations Cardiff
All structural alterations Cardiff homeowners need: wall removals, chimney breast removals and new openings. Calculation packs from £300 for Cardiff Building Regulations submission.
Welsh Building Regulations
Wales has its own Building Regulations, fully separate from England since 2023. Our structural calculation packs meet Welsh Building Regulations requirements for Cardiff Council and all South Wales local authorities.
South Wales Coverage
We cover all of South Wales: Newport, Barry, Penarth, Bridgend, Caerphilly, the Rhondda Valleys, Merthyr Tydfil and Swansea at the same fixed fee and turnaround as Cardiff city.
Structural Alterations Cardiff
Structural alterations is any work that changes how your property carries load. Here is what that means for Cardiff properties.
Structural alterations in Cardiff
Structural alterations Cardiff projects include load bearing wall removals, chimney breast removals, new openings in walls, floor alterations and any work that changes the load path through the building. Cardiff Council Building Control requires a structural engineer's calculation pack before approving any of these. Structural alterations Cardiff calculations start from £300. Wales has had its own Building Regulations since 2012, which have diverged further from England since 2023. Our packs are written to meet Welsh Building Regulations requirements.
Cardiff property types and structural implications
Victorian and Edwardian terraces in Roath, Cathays, Canton and Pontcanna have nine-inch solid brick internal walls with lime mortar. The ground-floor wall between kitchen and dining room nearly always carries the floor above in these properties, and sometimes carries a purlin as well. Whitchurch, Rhiwbina and Llanishen have 1930s semis with longer floor spans that increase the loads on internal walls. Penarth and the Vale of Glamorgan have a mix of Victorian seafront properties and newer detached homes, with strong demand for loft conversions. Properties in the Rhondda Valleys were largely built for coal-era workers and use solid brick construction similar to Cardiff's inner city terraces. We identify the construction type from your photos before confirming the scope and fixed fee.
Notes for Cardiff Projects
Local factors that influence structural design in Cardiff.
Roath and Canton terraces
Victorian solid brick with lime mortar. Floor joists and sometimes purlins bear on internal walls. Full load path check before every beam specification.
Whitchurch semis
1930s cavity brick semis with longer floor spans. Typically larger beams than the inner city terraces.
Welsh Building Regulations
Wales has separate Building Regulations from England since 2023. Our packs meet Welsh technical requirements for all CF and NP postcode areas.
Penarth and Vale
Strong loft conversion demand in Penarth. Victorian and Edwardian properties with typical solid brick construction.
Rhondda Valleys
Coal-era solid brick terraces with similar structural characteristics to Cardiff inner city stock. Same fees and turnaround.
How It Works
A straightforward five-step process from enquiry to Building Control submission.
1
Send drawings
A sketch, photos or architect plans. Anything helps us start.
2
Fixed price
We confirm a clear fixed fee in writing before any work begins.
3
Calculations
We design the beams, joists, padstones and connections required.
4
PDF pack
A clean Building Control-ready PDF for your builder and inspector.
5
Support
We answer Building Control queries included in the fixed fee.
What Cardiff Clients Say
Recent feedback from homeowners and builders across Cardiff.
★★★★★
"Kitchen wall removal in our Canton Victorian terrace. The engineer checked the purlin load above the wall before specifying the beam. Building Regulations approved without any queries."
Homeowner, Canton, Cardiff
★★★★★
"Loft conversion in Pontcanna needed a ridge beam and new joists. Calculations delivered quickly and the drawings were exactly what our builder needed."
Homeowner, Pontcanna, Cardiff
★★★★★
"Extension calculations for our Whitchurch semi sorted promptly. Foundation design and steelwork all in one pack. Straightforward from start to finish."
Homeowner, Whitchurch, Cardiff
Areas We Cover
We handle structural engineering across Cardiff and the surrounding area. Most work is handled remotely.
●Roath●Canton●Pontcanna●Cathays●Whitchurch●Rhiwbina●Llanishen●Llandaff●Cardiff Bay●Penarth●Barry●Vale of Glamorgan●Newport●Caerphilly●Bridgend●Rhondda Cynon Taf●Merthyr Tydfil
FAQs: Structural Engineer Cardiff
How much does a structural engineer cost in Cardiff?
Structural engineer Cardiff costs for residential work run from £245 to £1,500. A single RSJ beam calculation starts from £245. Structural alterations Cardiff are £300 to £900. A loft conversion is £395 to £1,000. A home extension is £500 to £1,500. All fees are fixed and confirmed before we start.
Do I need a structural engineer for a wall removal in Cardiff?
Yes, if the wall is load bearing. Cardiff Council Building Control requires structural calculations before approving any load bearing wall removal. You need a qualified structural engineer who can design the beam, check the padstones and produce the full Building Regulations pack. RSJ calculations start from £245.
Does Wales have different Building Regulations from England?
Yes. Wales has operated its own Building Regulations since 2012 and these have diverged further from England since 2023. The Welsh Government sets the technical standards. Our structural calculations are produced to meet Welsh Building Regulations requirements, and we are familiar with Cardiff Council Building Control procedures.
Do you cover Newport, Barry, Penarth and the Valleys?
Yes. Our structural engineer Cardiff service covers all of South Wales including Newport, Barry, Penarth, Bridgend, Caerphilly, the Rhondda Valleys, Merthyr Tydfil and Swansea. All work is carried out remotely so location makes no difference to the fee or turnaround.
How long does it take to get structural calculations in Cardiff?
RSJ beams and wall removals are ready in 24 to 72 hours. Loft conversions and extensions take 5 to 7 working days. If you have a tight deadline, let us know upfront and we will do what we can.
Do you need to visit the property?
No. We work entirely remotely. You send clear photos of the area, a rough sketch and basic measurements. The finished structural pack arrives by email, ready for Cardiff Building Control and your builder.
Get Your Cardiff Structural Engineer Quote Today
Fixed-fee structural calculations from £245. Building Control-ready in 24 to 72 hours.
Phone
Email
Response Time
Within one working day for most enquiries
Service Area
Cardiff, Roath, Canton, Pontcanna, Whitchurch, Penarth, Barry, Newport, Caerphilly, Bridgend, Rhondda Cynon Taf and wider South Wales.
Most projects are handled remotely from drawings and photos. If a site visit is needed we explain this upfront and include it in the fixed quote.
Get Started with a Structural Engineer Cardiff Today
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.
- Head Office: Corwell Lane, Uxbridge, England, UB8 3DE.
- 07359 267907
- info@structuralengineercalcs.com
- Company No: 12653163