How Much Does a Steel Beam Cost?
A component price and an installed price, an order of magnitude apart, and most arguments about a quotation start in the gap.
The steel itself is usually a few hundred pounds. A typical domestic beam weighs between 25 and 40 kilogrammes a metre, so a 3 to 4 metre beam is 75 to 160 kilogrammes cut to length, primed and delivered, and a fabricator's minimum order charge often matters more than the rate per tonne. Installed, that beam sits inside a structural opening commonly running £3,000 to £8,000, because the cost is the temporary propping, taking the masonry down, the padstones and whether the bearings need a new pier or pad beneath them, casing the beam for fire resistance, and making good afterwards. The structural calculations, the Building Control charge and any party wall surveyor are separate again.
The steel itself is usually a few hundred pounds. Installed, that same beam sits inside a job that commonly runs £3,000 to £8,000, because nearly everything you are paying for happens around the beam rather than to it.
This page is about a component, not a project. If somebody has quoted you a figure for “the steel”, it is worth knowing which of those two numbers they meant, because the gap between them is an order of magnitude and it is where most arguments about a price start.
| Where the money goes | What it is |
|---|---|
| The beam itself | Sold by weight, commonly a low to mid three figure sum |
| The bearings | A padstone each end, and a pier or pad foundation where the wall cannot take the load |
| Temporary works | Props, or needles through the wall above, before a brick comes down |
| Getting it in | Through a window or lifted in, where a hallway will not take it |
| Casing and making good | Fire casing, reveals, ceiling, floor and skirting along the old wall line |
| Downstand or flush | Flush means opening the floor above and hanging the joists off the beam |
What the steel actually costs
Structural steel is sold by weight, so the price follows the section size, and the section size follows span and load.
A typical domestic beam is a universal beam weighing somewhere between 25 and 40 kilogrammes a metre, so a 3 to 4 metre beam weighs roughly 75 to 160 kilogrammes. Cut to length, primed, and with end plates or web stiffeners welded on where the design calls for them, that is commonly a low to mid three figure sum from a fabricator. On a single small beam the minimum order charge often matters more than the rate per tonne does.
Above that, the numbers move quickly. A long or deeply loaded beam, a pair of beams bolted together, or a fabricated goalpost frame with designed connections and base plates runs into four figures on its own and belongs in a different conversation. The depth of the section is not a preference: it is set by the span, the load above and the deflection the design allows, which is why it is one of the few items on a quotation that cannot be value engineered. How that size gets arrived at is a separate question.
The bearings are where the money hides
A beam turns a spread load into two point loads, and the two points have to be able to take them.
At each end the beam lands on a padstone, a small precast or cast in situ block that spreads the load into the masonry below. The padstone is cheap. The question the structural engineer answers is whether the wall beneath it, and whatever that wall is standing on, can carry a concentrated load that was never there before.
Where the answer is no, the work is a new pier or a new pad foundation, dug by hand inside a room somebody is living in, with the spoil carried out through the house. That single finding moves the total more than the choice of beam ever will, and it is the reason a competent quotation carries an exclusion for it rather than pretending it cannot happen.
Temporary works are the real trade
The skilled part of the job is holding the building up while the wall that was holding it up is removed.
Where the wall carries only a floor, adjustable props under strongbacks either side will do it. Where it carries a floor and a roof, or masonry above, the load has to be picked up on needles: beams pushed through holes cut in the wall above the opening, propped on both sides, which means propping in the room above as well and working to a sequence rather than to instinct. That is a day or two of skilled labour before a single brick comes down, and it produces absolutely nothing you can point at afterwards.
It is also the first thing to disappear from a cheap price. A beam put in on inadequate propping does not fall down that afternoon; it shows up as cracking above the opening and doors that stop closing upstairs.
Getting it into the house
A 5 metre beam does not go down a hallway with two turns in it. It goes in through a window opening, over a fence with the neighbour’s agreement, or lifted in, and on a mid terrace with no side access that logistics problem is a genuine line on the price. Occasionally it changes the design: two shorter beams onto a central pier can be the cheaper answer to a wide opening, purely because they can be carried in.
The casing, the ceiling and the making good
A bare beam is not a finished job, and the finishing is a larger share of the cost than the steel.
The beam is cased to give the structure the fire resistance it needs, normally in plasterboard, which in a two storey house is a straightforward detail and in a taller one asks for more. Then the reveals are formed at each end, the ceiling either side is patched and plastered, and the floor and the skirting are made good along the line where the wall used to be.
Whether the beam sits as a visible downstand or flush with the ceiling is the biggest single choice you control. Flush means opening the floor above, trimming the joists and hanging them off the beam in hangers, and it costs meaningfully more than letting the beam show.
The costs that sit beside the steel and are not in it
The structural calculations are a fee to the engineer, not part of the beam. Building Control take a charge for the application and the inspections. Where a bearing goes into a shared wall, a party wall notice is served, and if the neighbour dissents the surveyors are paid by the building owner. Add flooring across the line of the removed wall, architrave and skirting to match, decoration, and whatever the wall turns out to contain. Old walls hold gas runs, pipes and cables, and some post war construction holds asbestos board, none of which can be priced before the plaster is off.
When a steel is not the answer
An opening in a non load bearing partition needs no beam at all, only a header and a check that nothing above is relying on it. A modest opening in a load bearing wall may take a proprietary concrete or steel lintel for a fraction of the cost. A flitch beam, a steel plate bolted between timbers, can be the right answer where the member has to be carried in and assembled in place. Which of those applies is decided by the calculation and not by preference, and what the whole job involves is set out in full.
These figures are indicative for the Colchester area at the review date below. Use them to sense check a quotation rather than as one.
Last reviewed August 2026.
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