The short answer
Structural calculations for a single beam or load-bearing wall removal typically cost £300–£700 in the UK for the design pack alone. A standalone single RSJ or beam calculation can sit lower, often around £60–£450 depending on complexity, while larger jobs such as a loft conversion with full calculations and drawings tend to run higher, commonly £800–£1,500. The pack normally includes load assessment, beam sizing, bearing and padstone checks, connection details and structural notes, signed and ready for Building Control. The figure depends on how many elements need calculating, the spans involved and the complexity of the loads.
'Calculations' can mean one beam or a whole loft's worth of structure, which is why quotes vary so much. Knowing what's in the pack helps you compare fairly.
Typical UK costs
- Single beam / RSJ~£60–£450
- Wall removal pack£300–£700
- Loft conversion calcs~£800–£1,500
- Pack includesbeam sizing, bearings, notes
- Drives the priceelements & spans
What's in a calculation pack
- Load assessment: working out what the structure carries above the new opening.
- Beam sizing: specifying the RSJ or steel beam for the span and loads.
- Bearing & padstone design: how the beam transfers load into the supporting walls.
- Connection details & notes: the structural notes a builder and Building Control work to.
| Job | Typical figure | Notes |
|---|---|---|
| Single beam / RSJ | ~£60–£450 | one element |
| Wall removal pack | £300–£700 | beam + bearings + notes |
| Loft conversion calcs | ~£800–£1,500 | calcs + drawings |
| Drives the price | elements & spans | more spans cost more |
Indicative UK figures for guidance. Sources: Checkatrade and MyJobQuote cost guides.
Why the range is so wide
The cost scales with how much structure needs calculating. A single beam over one opening is at the lower end; a multi-span opening, a roof alteration or a full loft conversion involves several elements and more checking, so it costs more. Complexity matters too — unusual loads, long spans or awkward bearings take more work. When comparing quotes, check whether drawings are included alongside the calculations, as some jobs need both and some need only the calculation pack.
Need structural calculations for your job?
We'll match you with a vetted chartered structural engineer who produces a Building Control-ready calculation pack on a clear scope, with drawings if your job needs them.
Frequently asked questions
How much do structural calculations cost in the UK?
For a single beam or load-bearing wall removal, typically £300–£700 for the design pack. A standalone single RSJ calculation can be lower, around £60–£450, while a full loft conversion with calculations and drawings tends to run £800–£1,500.
What's included in a structural calculation pack?
Usually load assessment, beam sizing, bearing and padstone design, connection details and structural notes — signed and ready for Building Control. Some jobs also need drawings, which can be a separate item.
Why do structural calculation quotes vary so much?
Because the cost scales with how much structure is involved. A single beam is at the lower end; a multi-span opening, roof alteration or full loft conversion involves more elements and checking, so it costs more.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on your specific project. They are guidance, not a quotation.