GS Renovation installs steel beams and RSJs across St John's Wood, from the detached villas off the main avenues to the red-brick mansion flats and bay-fronted Victorian and Edwardian terraces of NW8. With more than 30 years removing load-bearing walls in Westminster homes, we handle the engineering, the propping and the building control sign-off as one job.
Removing load-bearing walls in St John's Wood
The dividing walls in a St John's Wood terrace, and the chimney breasts in its rear closet wing, usually carry the floors and roof above, so they cannot simply be knocked out. We begin with a structural engineer who sizes the steel beam or RSJ for the span and the load, then specifies the padstones it will bear onto. Only once the calculations are agreed do we book the work and order the correct section.
On site we install temporary propping to support the structure, then carry out safe, staged demolition rather than pulling the wall down in one go. The new beam is lifted into position, seated on concrete or engineered padstones and packed tight so the load transfers cleanly. Westminster City Council building control inspects the steelwork before it is boxed in, and we provide the certificate you will need when you come to sell.
Party wall steel in NW8 terraces
Many St John's Wood terraces share their flank walls and chimney stacks with the house next door, which means a beam that bears into a shared wall falls under the Party Wall etc. Act 1996. Before any cutting starts you serve the correct notices on the adjoining owner, usually two months ahead, so the neighbourly side is handled properly and the project is not stopped once the props are already in.
In the mansion flats around NW8 the picture is different. Structural change is limited by the lease, so removing a wall needs the freeholder's licence to alter and coordination with the managing agent, and the engineer must confirm the flat below is not affected. Whether your home is a leasehold flat or a freehold villa, we scope the steel realistically, keep the propping tidy in an occupied building and clear up fully at the end.
Fire protection and the final visit
In a St John's Wood mansion flat the item that most often holds up a completion certificate is not the beam, it is the fire protection around it. Where a steel sits in a floor or wall separating one dwelling from another, or forms part of a protected escape route, it has to achieve a rated performance, usually through boarding or an intumescent coating specified alongside the engineer's design.
The inspector will want to see the bearings while they are open, and that is the visit everyone plans for. What is easier to forget is that they also want to see the protection before the ceiling closes, and to check that any compartment floor or wall has been properly made good around the steel. In a block, a hole left in a compartment line is a serious defect, so we photograph and record it before boarding. Acoustic separation is worth raising at the same stage, since a floor opened up for steel is the easiest time to improve it.
- Flitch beams where a slimmer steel and timber solution suits
- Structural engineer's calculations arranged and followed
- Party Wall Act 1996 notices and awards handled
- Building control applications and inspection sign-off
- Temporary propping and staged, controlled demolition
Why Choose GS Renovation in St John's Wood
St John's Wood homeowners choose GS Renovation because one team manages the whole job, from the engineer's calculations to the propping, the steel and the Westminster building control sign-off. With 30+ years under NW8 floors, we work cleanly in occupied villas and flats and hand over the certification your solicitor will later ask for.
- Fully insured, with cover in place on every site
- Restricted London access planned before the steel arrives
- Dust screens and floor protection in occupied homes
- High-density concrete padstones bedded at every bearing
- Paperwork and certificates handed over for when you sell
- Neighbours given notice before the noisy stages