Do You Need a Structural Engineer to Remove a Load-Bearing Wall?

Updated October 2026.

Taking out a load-bearing wall is one of the most effective ways to change how a home works. A dark kitchen and a separate dining room become one bright, open-plan space, often without adding a single square metre to the footprint.

It’s also a job where getting it wrong shows up fast. We’ve seen sagging ceilings, cracked plaster upstairs, floors that slope where they didn’t before and, in the worst cases, partial collapse, usually because a tight budget squeezed out the structural engineer. This guide explains why you need one, what they actually do, and how the process runs from first visit to sign-off.

Removing or altering a load-bearing wall needs Building Regulations approval. The structural design has to be checked by Building Control (your local authority or an approved inspector), and work shouldn’t start until it’s been accepted. Planning permission usually isn’t needed for internal walls, unless the building is listed.

Is the wall load-bearing?

The first job is to establish whether the wall is holding anything up. A load-bearing wall supports something above it: floor joists, the wall on the next floor, a chimney breast or part of the roof. Some clues you can check yourself:

• Floor joists above run across the wall rather than alongside it (you can often see this in the loft or under lifted floorboards).
• There’s another wall directly above it on the next floor.
• The wall is solid brick or block rather than a hollow stud partition.
• It runs roughly through the middle of the house, parallel to the front and back walls.

None of these is proof on its own. Stud walls sometimes carry load, and some brick walls carry very little. That’s why the answer should come from a site visit, not a guess.

What a structural engineer does

When a wall comes out, whatever it was carrying still needs a route down to the foundations. The engineer works out exactly what that load is and designs a way to carry it. That means:

• Checking the load path. Which way the joists run, what’s above, and whether the roof, a chimney or another wall is involved.
• Sizing the beam. Usually steel, sometimes timber or concrete, designed for bending, shear and deflection under the dead and imposed loads. You can read more about this in our guide to steel beam calculations for wall removals.
• Checking the supports. The walls or piers at each end of the beam must be able to take the new concentrated load down to the foundations.
• Specifying temporary support. How the structure above is propped while the wall is removed and the beam goes in. See temporary works explained.
• Producing calculations and drawings your builder can price and work from, and Building Control can approve.

Rules of thumb for the new beam

• Bearing length. A new beam normally needs at least 150mm of bearing onto the wall at each end. The exact length depends on the load and the wall it sits on.
• Padstones. The masonry under each end often needs strengthening so it isn’t crushed. A dense concrete padstone, cast in place or precast, spreads the load. Its size depends on the design.
• Fire protection. A steel beam in a house usually needs 30 minutes’ fire resistance, most often achieved with layers of fire-rated plasterboard fixed to the manufacturer’s specification. An exposed timber beam needs a calculation to show how much fire resistance its size and species provide. A reinforced concrete beam generally has enough, provided the steel inside has adequate cover.

How the job runs

1. Site visit and survey. We confirm what the wall is doing and look at the structure above and below.
2. Design. Calculations and drawings for the beam, supports and padstones, plus temporary propping.
3. Building Control. The design is submitted and approved before work starts.
4. Fabrication and installation. Your builder orders the beam from a fabricator, props the structure, removes the wall and installs the beam on its padstones.
5. Inspection and sign-off. The building inspector checks the beam before it’s boxed in, then the fire protection and finishes. Once everything is complete you receive a completion certificate, which you’ll want when you sell.

Frequently asked questions

Can a builder size the beam instead?

Building Control will normally ask for structural calculations from a qualified engineer. An experienced builder knows what’s typical, but the calculations are what get the work approved and protect you if questions come up when you sell.

Do I need to tell my neighbours?

If the beam bears onto, or you cut into, a shared party wall, the Party Wall Act may apply and you’ll need to serve notice. Our party wall structural engineering page explains where we fit in.

What if the wall was removed years ago without approval?

It’s more common than you’d think. An engineer can inspect what was installed and advise on any work needed to regularise it. If a chimney breast is involved, see someone already removed the chimney breast: is it safe?

Talk to us about your wall

Load-bearing walls are fundamental to how a house stands up, so they deserve proper thought before they come out. Our structural design and calculations service covers everything above, from the first visit to drawings ready for Building Control.

We work from offices in Peterborough and London. Call 01733 602 844 or email hello@oralabora.co.uk, or send us your plans.