Greater London · England
St John's Wood Fire Rated Sealant
Intumescent and fire-rated sealant around gaps, frames and service penetrations for homeowners, landlords and businesses in St John's Wood. Fully insured, ARBOMaster approved and guaranteed for a year.
- Open holes round services passing through fire walls
- Gaps flagged on a fire risk assessment
- Open gaps behind door architraves
How the job changes by surface
Linear gaps
Gaps along the top of partitions are easy to miss above a ceiling. We work along the whole run leaving no stretch unsealed.
Flats and HMOs
Converted houses often have gaps around old and new services. We seal the ones on your specification with a tested product and record where they are.
Fire rated sealant in St John's Wood
Until it’s heated, intumescent sealant behaves like an ordinary sealant; in a fire it expands into the joint. Which product suits a gap depends on its width, the materials either side and what runs through it. If you have standard silicone or caulk in a fire-stopping gap and holes left by a change of layout, we can help.
In London, a commercial job often starts with access: loading bays, building rules and lifts. For a building in St John's Wood, we agree timings and access before anything starts.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Place
- St John's Wood (NW8, NW6, NW3)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to St John's Wood
What else we do in St John's Wood
Landlord and commercial work in St John's Wood
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Why it’s worth doing now in St John's Wood
Leaving a gap until a refurbishment comes round can mean years with it open. Sealing the gap now is a contained job on its own. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in St John's Wood.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why us?
- Old sealant always removed completely
- Over 20 years’ experience
- Sanitary silicone with an anti-fungal additive in wet areas
- A 12-month guarantee on all work
See our cost guide and what customers say.
Do you need fire rated sealant in St John's Wood?
Buildings are refitted and reconfigured over the years. A house turned into flats or an HMO, or an office split into smaller units, brings new walls, new service routes and new gaps.
Most people get in touch after spotting something like this:
- Standard silicone or caulk in a fire-stopping gap
- Fire stopping disturbed by later work
- New service routes left unsealed after building work
- Unsealed gaps around fire door frames
If you look after a church, hall or community building such as Church of All Souls, service openings in its walls need the right fire-rated sealant, as in any building.
Comparing quotes
- How long the guarantee is
- What the cure time is
- What preparation is included
- How the colour is chosen
St John's Wood: your questions answered
Is parking an issue for fire rated sealant in St John's Wood?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you work for landlords with property near South Hampstead station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Do you work in flats, HMOs and commercial buildings?
Yes. Flats, HMOs, offices, schools and other occupied buildings are all part of our work. We agree access and the order of work with you first.
Can you match the sealant colour?
Most of the time, yes. We will explain which colours are available and agree one before any work starts.
Is standard sealant good enough for a fire gap?
No. It looks sealed but will not perform as fire stopping. Use a product tested for that gap and service, or ask us to do it.
Will we have a record of what was sealed?
Yes. You get a list of where we worked and what we used.
Do you have insurance?
Yes. Full insurance covers our work.
Do you work in St John's Wood?
Yes. We work in St John's Wood and the rest of Greater London. For a quote, call 0345 464 0079 or drop us an email.
How the visit works
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes a few hours for a handful of gaps, and longer for a whole building, depending on the size of the job. For a job in St John's Wood, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First we work through your list or survey, measuring each gap and checking what it’s formed in.
- We remove any old or unsuitable filler and clean the gap.
- Where the tested detail needs backing or fill, we fit it.
- The sealant goes in to the depth its detail sets, then it’s tooled off.
- Finally, we list where we worked and what we used, for your records.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Try not to wet indoor joints just before the visit
- Keep pets and children clear of the area while we work
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and give you a clear quote.
Advice
Workplaces and buildings in St John's Wood
Commercial buildings in London often have strict access rules and limited loading, so out-of-hours working can be arranged where needed. Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, and gaps around services are often picked up there. We apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
For site and facilities teams at buildings such as George Eliot Primary School, service openings in fire-resisting walls need checking after any refurbishment. For landlords with property near South Hampstead station, new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant.
St John's Wood is about 1 mile south of Hampstead, in Greater London. Across the NW8 area, we can carry out fire rated sealant at your property. Across Greater London, we cover 764 places, and St John's Wood is one of them.
Postcode districts we cover here for fire rated sealant: NW8, NW6 and NW3. That includes homes and businesses on The Lane, Hall Road and Hill Road. St John's Wood is on the A5205, so it’s easy for us to get to with everything needed for fire rated sealant. We also cover South Hampstead (1 mile north), Swiss Cottage (1 mile north), Primrose Hill (1 mile north-east), Lisson Grove (1 mile south) and Haverstock (1 mile north-east). Further out, we also cover London (4 miles south-east), Kensington (3 miles south-west), St Pancras (3 miles east), Shoreditch (4 miles east), Walthamstow (7 miles north-east) and Hoxton (4 miles east).
Local landmarks in St John's Wood
Locally, jobs take us to homes and businesses close to Cecil Sharp House, Primrose Hill and Arnold House School, among other places. Also close by are Quintin Kynaston Community Academy (within half a mile north-west) and Cafe Med pub (within half a mile north-west). There’s a railway station in St John's Wood itself: South Hampstead station. A little further out are Hospital of St John and St Elizabeth (less than half a mile south) and Montfichet's Tower (3.5 miles south-east). For a walk, there’s The Long Water and Primrose Hill.
What affects the quote in St John's Wood
We quote each job individually. This is what makes a difference:
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- How much there is to do
- Any mould that needs treating
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Call for a quick quote and we’ll go through it with you.
What to tell us for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- A few photos by email, if you can
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.