Budget £2,500 to £5,500 for the building work on a structural wall replaced with a steel beam, plus £525 to £1,575 for the structural engineer and the council charge, which normally sit outside a builder quote. A wall that carries nothing is £1,200 to £2,500. The averages you find elsewhere are lower because they stop at the building work, so here is the whole thing, line by line.
Neither of these is optional on a load bearing wall, and neither normally sits inside a builder quote. Together they add £525 to £1,575, which is the money the commonly quoted averages leave out.
Structural engineer
£250 to £900
Someone has to confirm the wall is load bearing and then size the beam that replaces it. That calculation is the document building control assesses, so it comes first, before a builder can price the job properly.
Calculations and a drawing for one straightforward beam are quoted at £250 to £400, and £300 to £500 for load bearing wall removal generally. Calculations specifically for an RSJ sit higher, at £450 to £900. Anything beyond that first calculation is charged again, and the two guides count it differently: one puts a site visit or revision at £75 to £150 per visit, the other puts extra consultations or revisions at £90 to £120 an hour, so ask which unit a fee is quoted in. Rates run £90 to £150 an hour in London and the South East against £60 to £100 in rural areas, so the same job is not the same fee everywhere.
Source: MyJobQuote structural engineer costs, BookaBuilderUK steel beam guide.
Building control charge
£276 to £675
The council charge for assessing the design and inspecting the work on site. On a load bearing wall this is not optional, and the fee is set per band of estimated build cost rather than per type of job.
Cost guides put this at £200 to £500. Two real council tables, set out below, run higher than that. Check the published schedule for your own council rather than budgeting a national figure.
Source: Bedford Borough Council, Kirklees Council.
As a whole this lands at £2,500 to £5,500 for a structural wall, covering the steel beam, the labour and making good. The same job on a wall that carries nothing, so with no beam to design or fit, is £1,200 to £2,500. Both figures come from a single guide, named just under this paragraph. Read the lines below as the parts a quote is built from, not as a sum to add up: a builder who quotes a beam installed has already included the labour, the padstones and some of the making good.
Source: BookaBuilderUK internal wall guide.
Steel beam, supply only
£150 to £1,200
The steel on its own, priced by span and load. One guide splits it by span: £150 to £300 for a beam of 2 to 3 metres, £250 to £600 for 3 to 5 metres, and £600 to £1,200 or more for a large or heavy load beam. The other prices an RSJ in one line at £300 to £1,200 without splitting it by span, which is the same picture from two angles.
Worth knowing before you read a quote: against building work of £2,500 to £5,500, the steel is rarely the largest line. Labour and making good usually are.
Source: BookaBuilderUK internal wall guide, MyJobQuote load bearing wall guide.
Steel beam, installed
£1,500 to £3,500
The same beam with the work around it: labour, padstones and making good. This is the number most people mean when they say what the RSJ cost.
When two quotes both say RSJ and differ by thousands, this is usually why. Ask each builder in writing whether the figure is supply only or installed, and what making good it includes.
Source: BookaBuilderUK internal wall guide.
Labour, priced separately
£800 to £2,500
Propping the structure, breaking out the wall, lifting the steel in and bedding it on padstones. Behind that figure sit day rates: a general builder at £180 to £250, a specialist structural contractor at £250 to £350, a labourer at £100 to £150.
A second guide prices builders at £150 to £250 per person per day, plasterers at £150 to £250 per day, and electricians at £50 to £95 an hour.
Source: BookaBuilderUK steel beam guide, MyJobQuote load bearing wall guide.
Temporary support
£10 to £20 per prop per week
Acrow props carry everything above while the wall below comes out and the beam goes in. Small money on its own, but the hire clock keeps running for as long as the props stay up, which is one reason a job that stalls halfway costs more than the delay looks.
Source: BookaBuilderUK steel beam guide.
Padstones and lintels
£40 to £300
Padstones at £50 to £200 spread the load where the beam lands. A concrete lintel is £40 to £150 and a steel lintel £50 to £300 where the opening needs one.
Source: MyJobQuote load bearing wall guide.
Making good
£300 to £4,000
Plastering, flooring, skirting and decorating once the dust settles. This is the line that separates a doorway from an open-plan room: £300 to £800 for a small doorway, £800 to £2,000 for a standard knock through, £1,500 to £4,000 for an open-plan kitchen diner.
A quote that stops at the steel is not a quote for a finished room. Read what happens to the ceiling, the floor join and the decoration.
Source: BookaBuilderUK internal wall guide.
Waste removal
£150 to £350
Skip hire for the rubble. A brick wall produces more waste than people expect, and a stud wall far less.
Source: BookaBuilderUK steel beam guide.
Every figure was checked at its source before publication; the full list with dates sits at the foot of the page. Ask any builder whether a quoted price includes VAT, and note that the two council schedules below handle it differently: one publishes before VAT, the other does not say.
The day rates above come from the guides that priced this job. The wider spans across three general rate guides sit on the day rate pages, and the two can differ at the edges; each page names its guide and date.
The most widely quoted UK average for this job, from MyJobQuote, is £1,200 to £1,750. Read that guide to the end and the figure turns out to be a narrow slice of it: it lists the structural engineer and the building control charge as separate costs beside it, and prices a 4 metre open-plan opening at £2,400 to £3,000 on its own. BookaBuilderUK, pricing the building work as a whole with steel, labour and making good, lands at £2,500 to £5,500.
The gap is not a disagreement about what builders charge. It is a disagreement about what counts as the job. Budget from the parts, not from the average.
BookaBuilderUK is just as plain about the top end, in its own words:
For larger openings or open plan conversions, costs can exceed £8,000, especially if services need rerouting or the structure is complex.
Sources: MyJobQuote, Load bearing wall removal cost guide, last updated 30 July 2026, for the average and the 4 metre comparison. BookaBuilderUK, Cost to knock down an internal wall (2026 guide), checked 13 August 2026, for the £2,500 to £5,500 building figure and the quoted line above.
This is the line the cost guides get wrong, and it is worth ten minutes of your time because it is the one number you can look up exactly rather than estimate. Councils set their own building control charges and band them by the estimated cost of the work, so there is no national figure to copy. Two real published schedules:
Bedford Borough Council
Charges valid from 1 January 2026. Bedford publishes its figures excluding VAT and states that VAT must be added to all charges submitted with an application, which is exactly where a budget goes wrong if you copy the headline number.
Source: Bedford Borough Council, Building control fees and charges, checked 13 August 2026.
Kirklees Council
Kirklees files this work under domestic alterations and says in as many words: "This includes removal of load bearing walls and chimney breasts etc." The published table does not state how VAT is treated, so ask when you apply. A further charge of £263.23 plus VAT applies where electrical or gas work is not certified by a registered competent person, which catches more kitchen jobs than people expect.
Source: Kirklees Council, Building regulations charges: domestic alterations to a single building, checked 13 August 2026.
Two councils are not a national picture, and that is the point: they differ from each other and both differ from the guides. Search your own council name with building control charges, find the band your estimated build cost falls into, and use that figure instead of anything on this page.
Width drives the price more than anything else, because it drives the size of the steel and the days on site. These are building work only, so add the engineer and the council charge from the breakdown above to each one.
Single doorway, about 1 metre
£1,000 to £1,500
1 to 1.5 days on site
Double doorway, about 2 metres
£1,250 to £1,750
1.5 to 2 days on site
Open-plan opening, about 4 metres
£2,400 to £3,000
2 to 3 days on site
Source: MyJobQuote, Load bearing wall removal cost guide, last updated 30 July 2026.
A kitchen knock-through is the most common version of this job and the most expensive, and not because the steel is bigger. It is because a kitchen wall carries services, and because the finished room has to look like one room rather than two rooms with a hole between them. No source isolates a clean extra over a plain wall, so here are the parts instead.
Electrical work: sockets, switches and lighting that sat on a wall which is no longer there
£150 to £800
Moving a gas pipe, for a hob or a boiler run
£200 to £1,000
Moving a radiator off the removed wall
£150 to £400
Reboarding and skimming the ceiling across the join
£400 to £1,200
Making good to open-plan standard rather than doorway standard
£1,500 to £4,000, against £300 to £800 for a small doorway
Source: BookaBuilderUK, Cost to knock down an internal wall (2026 guide), checked 13 August 2026. The radiator figure comes from MyJobQuote, Load bearing wall removal cost guide, last updated 30 July 2026.
A 3.5 metre opening between the kitchen and dining room of a 1930s semi, as worked through by one of the guides:
That example carries no building control charge. Add a real council figure from the tables above and the same job sits at roughly £4,450 to £4,850. Treat it as one worked case from the guide, not as a national average.
Source: BookaBuilderUK, Cost to install a steel beam in the UK (2026 guide), checked 13 August 2026.
Building regulations approval: needed
This is the part that is not a judgement call. A council building control page states it plainly, and adds that the structural design goes to the local authority for assessment, with the advice not to start work until it is approved.
Load bearing walls are fundamental to the structure of the house and cannot be changed or removed without building regulations consent.
Source: London Borough of Redbridge, Building Control: removing load bearing walls, checked 13 August 2026.
Planning permission: normally not
Internal work is a different track from planning. The exception is a listed building, where listed building consent is needed for significant works whether they are internal or external.
You should not need to apply for planning permission for internal alterations including building or removing an internal wall.
Source: Planning Portal, Internal walls, checked 13 August 2026.
What the replacement beam has to do
Two technical requirements decide the size of the steel, and therefore a good part of the price. The beam carries what the wall carried, and at each end it has to sit 150mm onto what is left of the wall. That bearing is why an opening can end up wider than the gap you pictured.
Any new beam should normally have at least 150mm bearing (overlap onto the existing wall) on each side.
Source: Planning Portal, Building regulations: load bearing walls, checked 13 August 2026.
Fire protection: the line quotes forget
Boxing the steel in to reach 30 minutes of fire resistance is real work with a real cost, and it is often missing from a quote that stops at the beam. Ask whether fire protection is included before you compare two prices.
If the beam is steel then it should normally be protected against fire so that it will have 30 minutes resistance to fire.
Source: Planning Portal, Building regulations: load bearing walls, checked 13 August 2026.
Who decides whether the wall is load bearing
Not you, and not by knocking on it. The official guidance names the professional and puts the advice before the work, not during it.
A structural engineer or surveyor can be employed to determine if the wall is load bearing and then design a beam to cater for these loads.
Source: Planning Portal, Building regulations: load bearing walls, checked 13 August 2026.
Planning and building regulations are two separate approvals that people mix up constantly, which is set out in planning permission versus building regulations. If the wall removal sits inside a bigger project, the free planning permission check walks that project through the permitted development limits and tells you which side of the line it falls.
If the wall you are opening up is shared with the house next door, or the new beam lands in that shared wall, the Party Wall etc. Act 1996 applies. The official guidance names this exact situation as one of the most commonly used rights under the Act.
to cut into a party wall to take the bearing of a beam (for example for a loft conversion)
Where surveyors do get involved, one guide puts a party wall surveyor at £120 to £250 an hour with an agreement costing £1,250 to £1,500, and another at £700 to £1,500 per surveyor.
Source: GOV.UK, The Party Wall etc. Act 1996: explanatory booklet, published 12 May 2016. Surveyor costs: MyJobQuote load bearing wall guide, BookaBuilderUK steel beam guide. Fuller detail sits in party wall agreement cost.
The breakdown above exists so you can read a quote properly rather than accept a single number. Four things separate a complete price from a cheap-looking one:
When you have the quotes in hand, put them side by side against independent figures with the free quote check. If the numbers vary more than you expected, the reasons are set out in why quotes differ, and the buffer this kind of work deserves is in renovation contingency.
The four cost guides above come from two publishers, so each pair counts as one voice rather than two. The regulation wording comes from the Planning Portal, a council building control page and the official government booklet for the Party Wall etc. Act, and the council charges from the two published schedules named above. Prices move and council schedules are reset, so every source carries the date it was checked. Where your own council or your own builder says something different, theirs is the figure that applies to your job.
Normally no. The Planning Portal states: "You should not need to apply for planning permission for internal alterations including building or removing an internal wall." Building regulations are a separate approval and they do apply. A council building control page puts it as: "Load bearing walls are fundamental to the structure of the house and cannot be changed or removed without building regulations consent." The exception on the planning side is a listed building, which needs listed building consent for significant works whether internal or external.
By having it checked rather than by tapping it. The official guidance says: "A structural engineer or surveyor can be employed to determine if the wall is load bearing and then design a beam to cater for these loads." It also advises speaking to one before any work starts. That inspection and calculation is the £250 to £900 line at the top of the breakdown, and it is also the document your council assesses.
Because the guides quote £200 to £500 while real council schedules run higher, and councils charge per band of estimated build cost rather than per type of job. Bedford Borough Council charges £511.16 before VAT on the full plans route for work up to £10,000, which is £613.39 with VAT at 20%, and £561.58 before VAT on the building notice route. Kirklees runs from £276.23 to £484.00 across the bands shown. Your own council publishes its own schedule, and that is the figure that counts for your job.
Usually because one is supply only and the other is installed. The steel on its own is £150 to £1,200 depending on span and load. The same beam fitted, with labour, padstones and making good around it, is £1,500 to £3,500. Ask each builder in writing which of the two the figure is, and what making good it includes, before comparing anything.
The build itself is usually 1 to 3 days on site, from 1 to 1.5 days for a single doorway to 2 to 3 days for an opening of about 4 metres. The lead time in front of it is longer: the structural calculation first, then the council assessment of that design. If the beam lands in a wall shared with next door, the Party Wall etc. Act adds at least two months of notice before work to that wall can start.
Not always, and it is a real cost. The Planning Portal states: "If the beam is steel then it should normally be protected against fire so that it will have 30 minutes resistance to fire." Boxing the beam in to reach that standard is work someone has to price. If a quote stops at the beam, ask where the fire protection sits.