Structural alterations are the one category of domestic building work where getting the specification wrong isn't just a cost or finish issue — it's a safety issue. Removing or altering a load-bearing wall changes how the loads in the building travel, and the sequence used to do it safely has to be planned before any brick is touched.
A specification for this work must be built around the structural engineer's design, not around a builder's estimate of what looks about right.
Structural engineer's calculations
Before pricing, the spec should confirm that a structural engineer has been engaged (or will be) to design the new steel or masonry support, produce calculations, and specify the beam size, grade and bearing detail. Any structural alteration quote that doesn't name the engineer or state the calculations are included as a cost item should be treated with caution.
The engineer's design should also address load paths above the opening — what the new beam is actually carrying, including any floors or roof loads transferred through it — not just the immediate wall being removed.
Temporary works and propping
Before the permanent beam goes in, the structure has to be temporarily supported — typically with strongboys, acrow props and needle beams through the wall. The spec should describe the propping method and confirm it's designed for the specific opening, not a generic 'temporary support as required' line.
Temporary works for anything beyond straightforward domestic openings should also be designed or checked by a competent person, and the spec should state who that is.
Building control and sign-off
Structural alterations require Building Regulations approval, and the completed work needs building control inspection at the relevant stages — before the beam is cased in, and at final completion. The spec should confirm inspection is booked and included, and state who is responsible for submitting the final structural completion certificate.
Making good and interfaces
Once the steel is in, making good above and around the new opening — plastering, matching skirting, redecorating the affected walls and ceiling — should be named explicitly, along with how services (electrical cables, pipework) running through the removed wall will be diverted or protected.
What cheap structural alteration quotes tend to omit
Engineer's fees, temporary works design, building control fees and full redecoration of the affected room are the most commonly missing items. Fire protection to the new steel where required by the building's fire strategy is another.
- Structural engineer's design fee and calculations
- Designed temporary works and propping, not just 'as required'
- Building control inspection at propping and completion stages
- Fire protection or casing to the new steel beam
- Making good and redecoration of the affected room
Common questions
Can any builder remove a load-bearing wall, or does it need an engineer?+
The design of the replacement support needs a structural engineer's calculation in almost all cases. The builder can carry out the work, but the design and the temporary works plan should not be improvised on site.
What happens if building control isn't involved in a wall removal?+
The work is technically unauthorised, which can cause serious problems when selling the property, and there is no independent check that the structure is actually safe. Always confirm building control sign-off is part of the job.
How long does propping need to stay in place before the permanent beam is fitted?+
This depends on the specific opening and sequence designed by the engineer — it can be a single day for a simple domestic opening, but the sequence should be followed exactly rather than shortened to save time.
Get a structural alteration quote with engineer's calculations included
We work from a structural engineer's design and a proper temporary works plan on every load-bearing alteration.