UK cost guide · September 2026
How much does it cost to knock through a wall in 2026?
Removing a load-bearing wall and fitting a steel beam costs about £3,000 to £5,400 including VAT for a 3 to 4 metre opening in an average UK area outside London (about £4,100 to £7,300 in London), including structural calculations, building control and basic making good. A doorway-sized opening costs £1,800 to £3,000; wider or complex openings £5,400 to £8,400.
Work out your knock-through with steel beam cost
Loading the calculator…
Already have a builder’s price? Check where your quote sits against this range. Still deciding what to do first? Read where to start a home renovation.
Knock-through with steel beam prices in 2026
Ranges are for a typical home outside London, including VAT, before fees and contingency. Use the calculator for your size and region.
| Type | Typical cost |
|---|---|
| Up to 2 m | £1,800 to £3,000 |
| 3 to 4 m | £3,000 to £5,400 |
| Wider than 4 m or complex | £5,400 to £8,400 |
Knock-through with steel beam costs by region
Labour costs vary across the UK far more than materials. Knock-through with steel beam prices in London run about 35% above the UK average outside London, and in Northern Ireland about 18% below it.
| Region | Typical cost |
|---|---|
| UK average (outside London) | £3,000 to £5,400 |
| London | £4,100 to £7,300 |
| South East | £3,500 to £6,200 |
| East of England | £3,200 to £5,800 |
| South West | £3,100 to £5,600 |
| West Midlands | £2,900 to £5,200 |
| East Midlands | £2,900 to £5,100 |
| Scotland | £2,900 to £5,100 |
| North West | £2,800 to £5,000 |
| Yorkshire and the Humber | £2,800 to £5,000 |
| Wales | £2,700 to £4,900 |
| North East | £2,600 to £4,800 |
| Northern Ireland | £2,500 to £4,400 |
Which region is my town in? Brighton, Oxford and Southampton are in the South East; Cambridge and Norwich in the East of England; Bristol, Bath and Exeter in the South West; Birmingham and Coventry in the West Midlands; Nottingham and Leicester in the East Midlands; Glasgow and Edinburgh in Scotland; Manchester and Liverpool in the North West; Leeds, Sheffield and Hull in Yorkshire and the Humber; Cardiff and Swansea in Wales; Newcastle and Sunderland in the North East; and Belfast in Northern Ireland. Somewhere else? Type your postcode into the calculator above and it says which region’s prices it uses.
Want it for your area? See local prices and council building control fees for 92 council areas in England and Wales (not every council yet).
What's included in these prices
Included
- Structural engineer's calculations
- Temporary supports
- Steel beam (RSJ) supply and fitting
- Building control fees
- Basic making good
Not included
- New flooring across the opened-up room
- Moving radiators, sockets or pipes in the wall
- Redecoration
- Party wall costs if the beam bears on a shared wall
What drives the cost
- Width. Longer spans need heavier steels and bigger padstones.
- What sits above. Walls carrying floors and roof loads need more support.
- Services in the wall. Pipes and cables have to be rerouted.
- Access. Getting a long steel into the house can need extra hands.
Planning, regulations and VAT
Removing a load-bearing wall needs building regulations approval and a structural engineer's design.
Party wall. In England and Wales, if you build on or at the boundary, cut into a shared wall (for example to rest a steel beam on it) or dig foundations close to a neighbour’s, you must give notice to every neighbour affected: one, or two if the work touches walls on both sides, which on a terrace usually means both. If a neighbour agrees in writing within 14 days, there is nothing to pay. If they don’t reply, or don’t agree, a party wall surveyor sets out how the work will be done: one surveyor agreed by both sides costs about £1,100 to £1,800 for each neighbour, including VAT. If a neighbour wants their own surveyor, the cost roughly doubles, and the person having the work done normally pays both (GOV.UK explanatory booklet). The Party Wall etc. Act 1996 does not apply in Scotland or Northern Ireland (the Act says where it applies).
Checklist: what to ask builders to confirm
Print this or save it as a PDF, one copy for each quote. Mark each line included, separate or not confirmed as quotes come in. An empty amount means unknown, not free.
| Item | What to confirm | Included? Amount? |
|---|---|---|
| Engineer | Calculations and beam specification. | |
| Building control | Application and inspection. | |
| Temporary works | Props and protection. | |
| Party wall | Notices, if the beam rests on a shared wall. | |
| Making good | Plaster, flooring and decoration. |
Questions people ask
Do I need building regulations to remove a wall?
Yes, if the wall is load-bearing. You need an engineer's design and building control sign-off.
How long does it take?
Usually two to five days for the structural work, plus time for plastering and decoration.
Sources and method
Our ranges combine published 2026 UK cost guides, industry data and our own survey of council fees. We check them every quarter. They are budget ranges, not quotes: always get at least three detailed written quotes. Read how Estiquote estimates work, or download the full cost data.