RSJ and Steel Beam Installation Hampstead

GS Renovation installs RSJs and steel beams across Hampstead, from period cottages near the Heath to the substantial Victorian villas of NW3. We coordinate the engineer, the propping and the building control sign-off so your knock-through is safe, level and signed off.

In Hampstead, 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 Hampstead.

How the job runs

1. Free site survey at your Hampstead address and an itemised quote.
2. The engineer we appoint sizes the beam, and the work is registered with Camden Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
3. Props go in, the opening is cut and the beam is set on padstones, packed tight above.
4. Building control inspects the steel before it is covered. We make good, and the completion certificate follows.

Steel beams for Hampstead terraces

Typical steel work in a Hampstead house involves opening up the rear closet wing or taking out the wall between the two reception rooms of a Victorian terrace. Because those walls carry the floors and often a chimney stack above, a structural engineer sizes the beam to the actual loads. We bear each end onto a concrete padstone, sized by the engineer to spread the load so the masonry below the bearing is not overstressed once the wall comes out.

Before any brick is touched we install temporary props and needles to hold the structure, then remove the wall in careful stages. On the tighter plots common near the village, access is limited, so we plan how the steel is craned or carried in, protect the period floors and staircase, and keep the site clean while the building is still lived in throughout the works.

Housing in Hampstead

Hampstead has about 11,670 homes on the Council Tax list: 63% pre-1919, 10% interwar and 27% post-war, with flats making up 78% and houses 22%. Where most homes are flats, a beam in a leasehold flat in Hampstead needs the freeholder's licence for alterations, since the lease usually keeps the structure with the freeholder.

Why a beam in a Hampstead flat starts with full plans

78% of homes in Hampstead are flats, and where a flat is held on a lease the approval route for a steel beam is decided before the steel is. Camden says a leaseholder must have the freeholder's consent and must make a full plans application rather than a building notice. So the faster route, where detailed plans are not submitted, is closed to a leaseholder. The engineer's calculations, the beam size, the padstone details and the temporary propping all have to be drawn and submitted first, and nothing is ordered from the fabricator until they are.

Camden gives a full plans decision within 6 weeks, or 2 months for more complex proposals. A beam that carries the floors of two flats above yours can sit in the longer band, so we plan the programme backwards from the likely decision date. The freeholder's licence and the full plans application can run side by side, since the freeholder's surveyor is likely to ask for the same calculations. Once both are in hand the steel is ordered, the props go up, and the wall comes out on a date that holds.

Party wall notices in NW3

The dividing walls and chimney breasts in a Hampstead terrace usually sit within a shared party wall, so cutting a beam bearing into that wall triggers the Party Wall Act. You serve the correct notice on the neighbouring owner in good time, and where a surveyor and schedule of condition are needed we point you to the right process before work starts, avoiding the disputes that hold up so many NW3 projects.

Every beam we fit is inspected and signed off under building regulations by Camden Council building control or a registered building control approver, not planning permission, since removing an internal wall is a structural matter rather than a planning one. You receive the engineer's calculations, the padstone details and the completion certificate, which protects the value of the property and reassures any future buyer or surveyor across the borough.

Coordinating the specialists on steelwork

A steel installation in NW3 pulls in people who do not work for us and whose diaries do not bend. The structural engineer is appointed at the start. The fabricator cuts, drills and often galvanises to the engineer's schedule, and that lead time is fixed. Building control or a registered building control approver books separately. Where the steel is heavy, a lifting contractor or a mechanical hoist may be needed on one specific day.

Our part is making those diaries meet. The engineer's design must be final before fabrication starts, because a hole drilled in the wrong place cannot be moved on site. Propping has to be up before the delivery lands. And the inspection needs to happen while the bearings are open, which pins the plasterer's start date. We plan backwards from the steel delivery, since that is the least flexible item in the programme. Where any of those dates slip, we would rather move the whole sequence than start a stage the previous one has not properly finished.

• Ceiling and floor levels resolved where the beam sits below joists
• Level, plumb and deflection checks before props are struck
• Load-bearing wall removal and knock-throughs

VOA Council Tax stock of properties, March 2025, for Hampstead Town, Frognal and Fitzjohns & Royal Free. Counts rounded by the VOA.

Once you know the scope of the RSJ and steel beam installation in Hampstead, it helps to read home renovation in Hampstead, RSJ and steel beam installation across Camden, London builders who fit steel, the Party Wall Act when a beam bears on a shared wall, RSJ and steel beam installation across London and Knock-Through Guide.

Why Hampstead Homeowners Choose GS Renovation

Homeowners across Hampstead choose GS Renovation because one team handles the engineer's design, the propping and the building control sign-off on your steel. With our founder's 30+ years on the tools, we understand how these period structures carry load and how to open them up safely without cracking the plaster next door.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.