RSJ and Steel Beam Installation Oakwood
Steel beam and RSJ installation in Oakwood, designed by the engineer we appoint and signed off by building control.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £1,500 to £4,000
- Free site survey, itemised quote
A steel beam is easy to specify and awkward to install. GS Renovation installs them in North London houses, backed by our founder's 30+ years on the tools, and in Oakwood that means working out how a five metre beam reaches the middle of a 1930s house before we agree a price. Everything after that is propping, bearing and fire protection.
In Oakwood, a steel beam for one opening typically costs £1,500 to £4,000 fitted and signed off, or £2,500 to £6,500 or more for a full knock-through with the engineer's fee and making good (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Oakwood.
Price guide
| Work | Indicative London range |
|---|---|
| Steel beam, one opening: supply, install, sign-off | £1,500 to £4,000 |
| Full knock-through with engineer and making good | £2,500 to £6,500+ |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: RSJ & Load-Bearing Walls.
How the job runs
- Free site survey at your Oakwood address and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with Enfield Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- Props go in, the opening is cut and the beam is set on padstones, packed tight above.
- Building control inspects the steel before it is covered. We make good, and the completion certificate follows.
Getting the steel into a 1930s Oakwood house
A 203 by 133 universal beam weighs roughly 25 kilos a metre, so a five metre length is a serious lift for four people down a narrow hall with a right angle turn at the front door. The wide frontages here help, because the lorry usually gets close and the beam crosses your own drive rather than the pavement. Where access genuinely will not allow it, the engineer can often design the opening around two shorter sections spliced together, or a flitch beam bolted up in position from steel plate and timber.
That decision belongs at design stage, not on the morning of the lift. We measure the route in: the hall width, the turn, the door opening, and often the side gate and garden path that these plots almost always have. Then we tell the engineer what is realistic. A beam that cannot be carried in is not a clever beam. Where a garden route exists we frequently bring steel in through the back of the house, which keeps the hallway cleaner and leaves the front of the property usable throughout.
Housing in Oakwood
Of the 3,450 homes the valuation list records in Oakwood, 3% were built before 1919, 44% between the wars and 52% since 1945; 44% are flats and 56% are houses. Semi-detached houses make up 37% of homes here, and a beam bearing on the shared wall of a semi in Oakwood means one party wall notice.
What a steel beam bears on in a post-war Oakwood house
In Oakwood 52% of homes were built after 1945, and the walls of those houses may not be the solid brick of the interwar streets. The inner leaf can be concrete block, sometimes a lightweight aerated block with far less strength under a concentrated load, and the existing openings are spanned by precast concrete lintels rather than brick arches. A steel beam puts its whole load onto two short lengths of that wall. Before the structural engineer we appoint sizes the padstones, we cut out a small area at each bearing position to confirm what the block is. A lightweight block may need a longer padstone, a concrete pier cast in place, or a post taken down to a footing of its own.
The ground floor matters as much as the walls. A post-war Oakwood house may stand on a concrete slab rather than suspended timber, which makes propping simpler, because the props stand on the slab instead of on boards over a void. The slab is not a foundation, though. Where the design brings a post down to floor level, the engineer usually asks for the slab to be broken out and a pad footing cast beneath the post, and the damp proof membrane lapped back afterwards. Heating pipes are sometimes buried in the screed, so the floor is checked with a detector before anyone cuts it.
Bearings, padstones and fire protection in N14
Beams fail at the ends, not in the middle. Each bearing needs the length the engineer specifies, commonly 100mm or 150mm, onto a padstone that spreads the point load into masonry which is genuinely sound rather than the soft yellow stock you sometimes find under a 1930s window opening. We bed the padstone on a full mortar bed, then dry pack the gap above the beam so load transfers straight away instead of after the wall has settled onto it and cracked a ceiling first.
Then the steel is protected. Approved Document B expects structural steel in a house to keep standing for a set period in a fire, and in domestic work that is normally achieved with plasterboard encasement rather than any exotic coating, so the beam is boarded properly rather than skimmed straight onto. Enfield building control inspects the beam, the padstones and the bearings before that boarding goes up. Book the visit late and you are pulling ceilings back down to show an inspector what you already covered.
- Ceiling and floor levels resolved where the beam sits below joists
- Making good, plastering and finishing around the new steel
- Load-bearing wall removal and knock-throughs
VOA Council Tax stock of properties, March 2025, for Oakwood Park & Highlands. Counts rounded by the VOA.
Trusted RSJ and Steel Beam Installation in Oakwood
We treat a beam as a sequence rather than a product: access checked before design, propping in before demolition, padstones bedded, dry packing driven home, boarding for fire resistance, inspection booked while everything is still visible. One team does all of it, so nobody is waiting on a fabricator, an engineer and a plasterer to agree with each other, and our founder's 30+ years of hands-on experience sits behind it.
We loved working with George and Ibrahim and would highly recommend them. They have done splendid job on our new kitchen refurb which including new…
George was a great find. The job required re-plastering the walls before fitting acrylic panels. He also re-plumbed the shower waste under the solid…
I am very happy to recommend George after he completed the work on my 2 bathrooms. He worked very hard to make sure everything was completed and even…
FAQ
Frequently Asked Questions about RSJ and Steel Beam Installation Oakwood
Is a cheap RSJ and steel beam installation quote in Oakwood worth taking?
Be careful with a cheap RSJ and steel beam installation quote in Oakwood, particularly if nobody has visited. Pricing a post-war suburban home unseen is how a low figure becomes a high one halfway through, because the masonry at each bearing decides the padstone detail. GS Renovation surveys, itemises within £1,500 to £4,000 for one beam opening (indicative) and holds the total. A second opinion on the N14 quotation costs nothing.
Can you fit an RSJ if my Oakwood house has no side access?
Usually yes, though it changes the design. Where a single long beam cannot be carried through the house, the engineer can specify two shorter sections spliced with bolted plates, or a flitch beam built from steel plate and timber and assembled in position. Both take a little more labour and both are entirely normal solutions. Most Oakwood plots do have a side gate and a wide frontage, so the more common route is straight off the driveway, which keeps the hallway and its floor covering out of the job altogether.
Who works out the size of an RSJ for my Oakwood house?
A structural engineer, from the span, the loads coming down and what sits above: a floor, a stud partition, a bath, or brickwork carrying the roof. In a 1930s Oakwood house they will usually want joist direction confirmed by lifting a board, and a look in the loft. The calculations go to Enfield building control with the application, and the beam is ordered once they are accepted.
How long do props stay in when an RSJ goes into an Oakwood house?
Until the steel is packed tight to the brickwork above and the mortar under the padstones is strong enough to take load; pulling them the same afternoon is a false economy. Props stand on boards to spread weight over the suspended timber floor, sometimes with extra support down to the oversite beneath. The Enfield inspector can see the bearings while props are still in.
Can the RSJ in my Oakwood kitchen be left exposed?
It can, but the fire protection that boarding normally provides then has to come from a coating building control accepts, specified before the steel is ordered. An exposed beam also shows every flaw in the bearings and packing, so the ends need detailing. Under a modest 1930s ceiling height a visible steel can make the room feel lower rather than more industrial, so view it drawn at full size first.
What happens on the day the steel goes into an Oakwood house?
The props are already in, so the day is lifting, seating and packing. The beam comes in by the route agreed at survey, is raised onto padstones bedded beforehand, levelled with steel shims and dry packed above. Floors, stairs and hall are protected, and nothing is plastered until Enfield building control has seen the bearings, which keeps the opening visible for a short while.
How can the age of an Oakwood house be confirmed before a beam is designed?
Start with the deeds and any records Enfield Council building control holds for the address, then look at the fabric itself. In Oakwood 44% of homes were built between 1919 and 1939 and 52% after 1945, and the two eras differ inside the wall. Interwar houses tend to have brick inner leaves and timber ground floors, while post-war houses can have block walls and concrete floors. A small opening at each bearing settles it for the engineer.
If an Oakwood house is in the Trent Park Conservation Area, do new garden doors need consent?
Possibly, so check before the glazing is ordered. Planning Data records the Trent Park Conservation Area, designated in 1973, as covered by the Enfield Borough Conservation Areas Article 4(2) Direction 2006. A direction of that kind withdraws named permitted development rights on elevations facing a road, waterway or open space. New doors or a widened opening on an elevation it covers may then need a planning application, even though the steel behind them is only a building control matter. Read the direction's schedule against the drawings.
Does a beam under someone else's flat in an Oakwood block need extra fire protection?
Usually it needs more than a beam in a house. In Oakwood 44% of homes are flats, and where a new steel carries the floor of another flat it is holding up a compartment floor between two homes. The fire resistance asked of it is set by that role, and the encasement or coating is specified to match before the steel arrives. The building control inspector can ask to see the boarding or coating before the ceiling is closed.
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