Load-Bearing Wall Removal: Your Complete Structural Engineer Guide
Removing a load-bearing wall is one of the most popular home improvements in London. It opens up living spaces, creates open-plan kitchen-diners, and adds real value to your home.
But it's also one of the most dangerous jobs to get wrong. Remove a structural wall without proper support and you risk cracked ceilings, sagging floors, and in serious cases, partial collapse.
Here's everything you need to know — from identifying if a wall is load-bearing to getting Building Control sign-off.
Is Your Wall Load-Bearing?
Not every wall is structural. Here's how to get an idea (though you should always get a structural engineer to confirm):
Signs a wall might be load-bearing:
- It runs perpendicular to floor joists above
- It's on the ground floor directly below the centre of the house
- There's a wall directly above it on the next floor
- It's a thick wall (usually 100mm+ of solid brick or block)
- The floorboards above run parallel to it (the joists span onto it)
Signs it might be a partition (non-structural):
- It's a thin stud wall (hollow when knocked)
- It runs parallel to the joists above
- It doesn't line up with any wall above or below
- It was clearly added later (different brickwork, sits on top of floorboards)
Important: Never rely on these indicators alone. We've seen "obvious" partition walls that turned out to be load-bearing, and thick masonry walls that weren't structural. A structural engineer's assessment is the only way to know for certain.
What Happens During a Load-Bearing Wall Removal
1. Structural Engineer Assessment
A structural engineer visits your property, inspects the wall, checks the floors above and below, and determines what loads the wall is carrying.
2. Steel Beam Design
The engineer designs a steel beam (RSJ) to span the opening. The beam takes over the job of the wall — carrying the weight of everything above and transferring it to the remaining structure on each side.
Key design decisions include:
- Beam size — calculated based on the span and the load it must carry
- Padstones — concrete or steel pads that spread the load where the beam sits on the supporting walls
- Bearing length — how far the beam needs to rest on each wall (minimum 150mm typically)
3. Building Control Calculations
Your structural engineer produces detailed calculations proving the beam is the correct size. These are submitted to your local Building Control department for approval.
4. Builder Installation
With approved calculations in hand, your builder:
- Installs temporary support (Acrow props) to hold up the floor above
- Removes the wall
- Lifts the steel beam into position
- Packs and fixes the beam with padstones
- Removes temporary support once the beam is secure
5. Building Control Inspection
Building Control visits to inspect the beam installation. They check it matches the engineer's drawings. Once satisfied, they issue a completion certificate.
How Much Does Wall Removal Cost?
Structural Engineer Fees
| Service | Cost | |---|---| | Single beam calculation | £400 – £800 | | Multiple beam calculations (e.g. two walls) | £600 – £1,200 | | Site visit + calculations + drawings | £500 – £900 |
Builder Costs (installation)
| Work | Typical Cost | |---|---| | Single wall removal + beam | £1,500 – £3,500 | | Two walls knocked through | £3,000 – £6,000 | | Making good (plastering, decorating) | £500 – £1,500 |
Total project cost is typically £2,000 – £5,000 for a single wall removal including engineer, builder, and Building Control fees.
See our full structural engineer pricing guide →
Real Project: Kitchen Wall Removal in a Victorian Terrace, Stratford
A homeowner in Stratford had a classic Victorian terrace layout — a narrow hallway with separate kitchen and dining room divided by a load-bearing wall. They wanted open-plan living throughout the ground floor.
The challenge: The wall was carrying the first floor joists and the party wall above. The span was 4.2m — wider than a typical single opening. At that span, the beam size and padstone details become critical.
What we designed:
- A 254×146 UB 31 steel beam to span the full 4.2m opening
- 300mm deep concrete padstones at each end to spread the point load onto the brickwork piers
- Temporary propping details so the builder knew exactly where to place Acrow props during the removal
- A full set of calculations showing load takedowns from roof to foundation
What the builder said: "The propping detail saved me a phone call. I knew exactly where to put the Acrows and how many I needed." That's the kind of detail we always include — it stops the builder guessing and stops the job going sideways.
Costs: Structural calculations + drawings: £500 fixed. The builder charged £2,800 for the removal, beam install and making good. Total project: £3,300.
Timeline: We delivered calculations in 4 working days. Newham Building Control approved in 2 weeks. Builder completed the work in 2 days.
Common Mistakes We See (and How to Avoid Them)
After hundreds of wall removal projects across London, here are the issues we encounter most:
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Builder choosing the beam size by eye. We've been called to inspect jobs where a builder used a 152mm beam for a 3.5m span carrying two floors. It was visibly deflecting. Don't let anyone "estimate" a beam size — it must be calculated.
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No padstones. The beam needs to sit on padstones that spread the concentrated load. Without them, the brickwork under the beam ends can crack and crush. We specify padstone dimensions for every job.
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Removing temporary props too early. The beam must be fully packed and bedded before props come out. We include propping and de-propping sequences in our drawings.
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Not checking the wall below. If you're removing a ground floor wall, the load goes into the foundation. In older London properties, foundations can be as shallow as 300mm. We check that the remaining structure can handle the redistributed load.
Yes — if the wall is load-bearing. It's a Building Regulations requirement. Your builder cannot legally install a steel beam without an engineer's calculations, and Building Control won't approve the work without them.
Even if you're "pretty sure" it's just a partition wall, we'd recommend getting an engineer to confirm. A brief assessment could save you from a costly mistake.
Common Questions
Can I remove a load-bearing wall myself?
Technically the removal is a building job, not an engineering job — so your builder does the physical work. But you must have a structural engineer design the supporting beam first. DIY structural work is never advised.
Do I need planning permission?
Usually no. Internal wall removal is typically covered by Building Regulations only, not planning permission. However, if your property is in a conservation area or is a listed building, you may need additional approvals.
How long does the whole process take?
- Structural calculations: 5–7 working days at SBS (express 48-hour available)
- Building Control approval: 2–4 weeks (varies by borough)
- Builder installation: 1–3 days for a single wall
What size steel beam will I need?
This depends entirely on the span (width of the opening) and the load (what's above). Common sizes for domestic wall removal are 152×89mm to 254×146mm UB (Universal Beams). Your structural engineer specifies the exact size — never let a builder guess.
Will I see the beam?
You can either:
- Box it in with plasterboard to hide it (most common)
- Leave it exposed for an industrial look (less common in London homes)
- Raise the beam into the floor above (possible if there's space, gives a flush ceiling)
Why Choose SBS for Wall Removal Calculations?
- Residential specialists — wall removals and beam calculations are one of our most common projects
- 1-week turnaround as standard, with express 48-hour option
- Fixed pricing — we quote upfront, no hourly rates
- Building Control ready — calculations are formatted for immediate submission
- Free consultation — we'll assess your project and give you a clear quote
Steel beam calculation service →
Get a Free Quote
Ready to open up your living space? Get in touch for a free, no-obligation consultation:
- Request a free quote →
- Call: 07401 650600
- Locations: We cover London, Ilford, Essex and Kent — see all areas →
