Greater London · England
Fire Rated Sealant in South Kensington
Intumescent and fire-rated sealant around gaps, frames and service penetrations for homes and businesses in South Kensington and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps where walls meet ceilings or slabs
- Door frames with gaps between frame and wall
- Fire seals that have cracked with movement
About our fire rated sealant in South Kensington
Ordinary silicone or decorators’ caulk in a fire-stopping gap isn’t a fire-rated seal. Anything unsuitable comes out first and reseal with a fire-rated product tested for that kind of gap. If you have sealant items on a fire risk assessment action list and door frames with gaps between frame and wall, we can put it right, whatever the surface.
London blocks of flats carry pipes and cables through walls and floors in their common parts and service risers. In South Kensington, building managers may need both fire-rated sealant around those openings and new sealant in shared washrooms.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- South Kensington (SW3, SW7, SW10)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in South Kensington and across Greater London. Several sites can be quoted together, and we’re fully insured.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Fire rated sealant in South Kensington: local notes
There are hotels and other places to stay in and around South Kensington. For hotels, a room-by-room programme keeps most rooms in use while the work goes on. Commercial buildings in London often have strict access rules and limited loading, so out-of-hours working can be arranged where needed.
South Kensington is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Community buildings like Chapel of St Luke are part of the picture too: service openings in its walls need the right fire-rated sealant, as in any building.
South Kensington is about 1 mile south-east of Kensington, in Greater London. Wherever you are in the SW3 postcode area, our applicators can take on fire rated sealant. South Kensington is one of 764 towns and villages in Greater London we cover for fire rated sealant.
Work in SW3, SW7 and SW10 works the same way as everywhere else we cover. Fire rated sealant is available to properties on King's Road, Fulham Road and Museum Lane and the roads around them. Main roads around South Kensington include the A3217. Neighbouring places we cover for fire rated sealant include Little Chelsea (1 mile south), Chelsea (1 mile east), Brompton (1 mile north-east), World's End (1 mile south) and Earl's Court (1 mile west). Larger places within reach include London (4 miles east), St Pancras (4 miles north-east), Shoreditch (5 miles north-east), Walthamstow (9 miles north-east), Hoxton (5 miles north-east) and Whitechapel (5 miles east).
What’s near South Kensington
We work in homes and buildings around London School of Dramatic Art, Burton’s Court and Anglesea Arms and the streets around them. Nearby too are Natural History Museum Library and Archives (less than half a mile north) and Collingham College (0.5 miles west). For rail, the closest station is West Brompton station, about 0.8 miles west of the centre. Nearby you will also find Victoria and Albert Museum Spiral (under half a mile north) and Baynard's Castle (3.6 miles north-east). For a walk, there’s Serpentine and Campden Hill.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Include hidden areas like risers in routine checks
- Tell trades working in the building that fire seals must be put back
- Keep the record of products and locations with your fire safety documents
- Don’t fill fire-stopping gaps with ordinary foam or silicone
Leave the sealant to cure fully before painting near it. Some fire-rated sealants can be painted and some cannot, so ask us which we used.
An open gap isn’t only a fire issue: they also let noise, draughts and sometimes pests through. Sealing them early helps on every front.
South Kensington questions
Do you work for hotels and guest houses in South Kensington?
Yes. Hotel and guest-house work is part of what we do. Work can be planned room by room, and out-of-hours working can be arranged.
I let a flat near West Brompton station. Can you help?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Is there a guarantee?
Yes. Each job is guaranteed for twelve months.
Do you have insurance?
Yes. We are fully insured.
Can you tell me how many minutes the seal will last?
Ratings and certificates are not something we issue. The performance comes from the product’s tested details and the specification from your assessor or designer; we install to those details and record what we did.
What information do you need?
A short description and the location, with photos by email if possible. We will ask anything else we need to know.
Can you give us a record of the work?
Yes. Locations and products are written up when we finish. Tell us if your assessor needs it in a particular format.
Why deal with it now?
If an assessor has flagged gaps, it makes sense to close them before the next review. Having them sealed and recorded now means you can show the action was taken. In London conversions, one flat’s bathroom is often above another flat’s ceiling, 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 South Kensington.
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 explain what it covers.
Why choose Mr Mastic in South Kensington
- An ARBOMaster approved applicator
- Domestic, commercial and hotel work
- Old sealant always removed completely
- Neat joints and a tidy finish
Take a look at what affects the cost or what customers say.
How the visit works
The work is kept neat and contained to the joints we’re treating. The job usually takes a few hours for a handful of gaps, and longer for a whole building, and we explain the cure time before we leave. In South Kensington, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- Before starting, we go through the specification or action list with you.
- Each gap is measured and its substrate and service noted.
- Any non-fire-rated filler is removed and the gap cleaned.
- The specified fire-rated sealant goes in over any backing its detail requires.
- Every location is recorded with the product used.
Before we arrive
- Move anything stored near the joints
- Keep children and pets away from the work area
- Try not to wet indoor joints just before the visit
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear quote.
Related advice
Also near South Kensington
Other services in South Kensington
When to call us in South Kensington
Gaps also open up as buildings move: a seal that cracks or pulls away leaves a path for smoke. Damage from cleaning, knocks and maintenance adds to it.
Common reasons people contact us include:
- Ordinary sealant used where a fire-rated product was needed
- Fire stopping disturbed by later work
- Gaps flagged on a fire risk assessment
- Open joints along the top of partitions
For site and facilities teams at buildings such as Our Lady of Victories RC Primary School, gaps opened by contractors for new cabling are a common finding in schools and offices.
Before you book anyone
- When the joint can take water or movement
- What the quote includes, VAT included or not
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
What affects the quote in South Kensington
Jobs vary more than people expect. What affects the quote:
- Access and height
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
- The size of the job
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The rough size of the job
- Photos by email, if that’s easy
- If it’s domestic, commercial or a hotel
- If someone has resealed it before
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.