RSJ and Steel Beam Installation Dulwich

GS Renovation installs RSJs and steel beams across Dulwich, working on the bay-fronted Victorian and Edwardian terraces that fill the SE21 streets around Dulwich Park. We remove load-bearing walls safely, from the dividing wall between two receptions to the wall closing off a rear closet wing.

In Dulwich, 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 Dulwich.

How the job runs

1. Free site survey at your Dulwich address and an itemised quote.
2. The engineer we appoint sizes the beam, and the work is registered with Southwark 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 beam knock-throughs in Dulwich terraces

Most Dulwich steel work involves opening up the two front-to-back reception rooms in a period terrace, or removing the wall between the kitchen and the rear closet wing. Every beam is sized by a structural engineer for the actual span and loads above, then set to bear onto concrete padstones at each end. We never guess a section, because the wall above often carries the floor joists and part of the roof.

Before any brickwork comes down, we install temporary propping to support the floors and any masonry overhead, then take the wall out in safe, staged sections. In these solid-walled SE21 houses the dividing wall frequently forms part of a shared party wall with the neighbouring terrace, so the sequence and propping have to be planned with the connected structure in mind.

Housing in Dulwich

Dulwich's housing, as the Council Tax list records it, is about 14,360 homes: 45% houses, 55% flats, with 56% pre-1919, 11% interwar and 30% built since 1945. Where most homes are flats, a beam in a leasehold flat in Dulwich needs the freeholder's licence for alterations, since the lease usually keeps the structure with the freeholder.

Choosing the building control route for a Dulwich beam

Southwark Council's online form lets a Dulwich beam go in under one of three routes: a building notice, full plans or regularisation. The choice matters more than it looks. Under a building notice no plans are approved before work starts, so the inspector may first see the engineer's beam when the props are already up and the wall is open. Under full plans, the calculations and the bearing details can be examined before any brick comes out, and a change to the section is made on paper rather than on site with the house propped.

Full plans can suit a larger opening in Dulwich because a wall is not always what it looks like. 56% of homes in the area were built before 1919 and 30% after 1945, and a wall of either age may have been altered since it was built. A wall that looks like solid brick from the room side can turn out to be a later blockwork infill, a patched opening or a concrete lintel from an earlier alteration. Full plans lets the engineer's bearing details be checked before work starts, so a surprise on site becomes a change to an approved design. Southwark's fee schedule also lists its building control charges before VAT, with VAT added when the invoice is raised, so budget for the council's charge with VAT on top.

Party walls and building control in SE21

Where the wall you want to open sits on the boundary with the house next door, the Party Wall etc. Act 1996 applies. You serve the correct notices on adjoining owners in good time, as building owner or through your surveyor, and we give you the engineer's drawings for them. That matters on the tightly built East Dulwich terraces where chimney breasts and dividing walls are commonly shared. Getting this right protects both properties and keeps the job moving without disputes.

Structural beam work is controlled under the Building Regulations rather than planning permission, so it needs building control approval, not an application to Southwark Council for permission. We arrange inspection at the key stages, with the engineer's calculations and beam schedule ready, and secure sign-off once the steel, padstones and fire protection are in place, giving you the certificate you will need when you come to sell.

Bringing a beam into a Dulwich house

The streets around Dulwich Village and the park are leafy and narrow, and many houses sit behind a front garden with a path too tight for a wheeled load. A five metre steel is heavy and will not turn corners, so we measure the approach at survey and decide then whether it comes in through the front door, through a temporarily removed window, or over the rear boundary from an adjoining garden with permission.

Waste travels the same route and there is a great deal of it, so collection points are planned where they will not stand on grass verges or block the footway. Where a property falls under the Dulwich Estate scheme of management, restrictions can apply to skips and hoarding on the frontage, and bagged collection or a shorter hire is the practical answer. Settling this before the steel is ordered avoids a delivery arriving with nowhere to go.

• Steel delivered cut, drilled and primed to the engineer's schedule
• Steel columns, base plates and bolted connections
• Ceiling and floor levels resolved where the beam sits below joists

VOA Council Tax stock of properties, March 2025, for North Dulwich, East Dulwich, Herne Hill & Dulwich Park and Dulwich Hill. Counts rounded by the VOA.

Plenty of Dulwich projects start with one job and grow, so it helps to see home renovation in Dulwich, RSJ and steel beam installation across Southwark, London builders who fit steel, the Party Wall Act when a beam bears on a shared wall, how we handle RSJ and steel beam installation across London and Cracks in Walls: When to Worry.

Why Dulwich Homeowners Choose GS Renovation

Dulwich homeowners choose GS Renovation because we treat the structure as the priority, not an afterthought. One team handles the engineer's design, the propping, the safe demolition and the building control sign-off. After our founder's 30+ years on the tools, we know how these houses are built and we make the mess and disruption as short as possible.

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.