Greater London · England
Fire-rated sealant in Chelsea, Greater London
Problem with your fire-stopping gaps in Chelsea? We cut out the old, prepare the joints and apply the right sealant.
- Gaps around pipes and cables through fire-resisting walls
- Standard silicone or caulk in a fire-stopping gap
- Open joints along the top of partitions
Work for landlords, hotels and businesses
For anyone letting property in or around Chelsea, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together.
Fire rated sealant in Chelsea
Bigger jobs can be worked through in stages, flat by flat or floor by floor. That record is useful for your files and for whoever looks at the building next. We work on door frames, flats & HMOs and plasterboard & masonry, and the jobs we see most are unsealed gaps where pipes and cables go through a wall and linear gaps at the head of walls.
In London, a commercial job often starts with access: loading bays, building rules and lifts. For a building in Chelsea, we agree timings and access before anything starts.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Location
- Chelsea (SW3, SW10, SW1X, SW1W)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
When it is not the sealant
We will always be straight with you, so here’s what new sealant won’t do:
- Walls or floors that weren’t built to resist fire
- Doors that aren’t fire doors in the first place
- Fire risk assessments, which need a qualified assessor
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Surfaces we seal
- Plasterboard & masonry
- Flats & HMOs
- Linear gaps
- Service penetrations
- Pipe & cable gaps
- Door frames
Your questions about fire rated sealant in Chelsea
Is parking an issue for fire rated sealant in Chelsea?
Parking in Chelsea, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you work in hotels near Chelsea?
Yes, we work for hotels as well as homes and businesses. A room-by-room programme keeps most rooms in use while the work goes on.
Will we have a record of what was sealed?
Yes. We note each location and the product that went in.
I’m a tenant. Can you help?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Chelsea, along with the rest of our area.
What does fire rated sealant cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Signs you need fire rated sealant in Chelsea
Gaps also open up as buildings move: cracked or debonded sealant leaves an open route through the wall. Damage from cleaning, knocks and maintenance adds to it.
If you can see any of these, it’s time to have the joints looked at:
- Unsealed gaps around fire door frames
- Sealant items on a fire risk assessment action list
- Standard silicone or caulk in a fire-stopping gap
- Linear gaps at the head of walls
Rented homes near London Victoria station change hands often, and any gap left by new services in shared walls should be closed with a fire-rated product.
What your quote should include
- Is VAT in the price?
- Which colour the sealant will be
- Whether they seal over old material or remove it
- How long the guarantee is
What we do, step by step
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on how many gaps there are in most cases. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Chelsea. A visitor permit or a nearby bay makes the visit run more smoothly.
- We plan the order of work and access, floor by floor or flat by flat.
- Old, damaged or unsuitable sealant is removed.
- Gaps are cleaned of dust and loose material.
- We apply and tool the sealant to the product’s tested detail.
- Locations and products are written up and any gaps unsuitable for sealant are flagged.
Before we arrive
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
- Mention any sign-in or site rules at work premises
Get a quote
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
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Places near Chelsea
Other services in Chelsea
Fire rated sealant in Chelsea: local notes
There are hotels and other places to stay in and around Chelsea. For hotels, a room-by-room programme keeps most rooms in use while the work goes on. In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, and gaps around services are often picked up there. We work to the specification you are given, installing the product to its tested details.
As a London address, Chelsea can be tricky for parking: let us know about parking bays, permits or a driveway. Schools such as Oratory Roman Catholic Primary School are buildings too, and service openings in fire-resisting walls need checking after any refurbishment.
Chelsea is about 2 miles south-east of Kensington, in Greater London. Wherever you are in the SW3 postcode area, we cover fire rated sealant for homes and businesses. Our area takes in 764 places across Greater London.
All of SW3, SW10, SW1X and SW1W is within our area for fire rated sealant, from the main roads to the quietest streets. We cover properties on Markham Square, Wellington Square and Tedworth Square and the roads around them. Main roads around Chelsea include the B302 and B304, which makes travel easy. If you’re just outside Chelsea, we cover Brompton (1 mile north), South Kensington (1 mile west), Little Chelsea (1 mile south-west), Belgravia (1 mile north-east) and World's End (1 mile south-west). Larger places within reach include London (3 miles east), St Pancras (3 miles north-east), Shoreditch (5 miles north-east), Walthamstow (9 miles north-east), Hoxton (5 miles north-east) and Whitechapel (5 miles north-east).
Around Chelsea
Typical jobs here are in homes near Burton’s Court, St Thomas More RC Language College and Markham Arms Public House, among other places. Also close by are Natural History Museum Library and Archives (0.7 miles north-west) and Hellenic College of London (0.5 miles north). The closest station to Chelsea is London Victoria station, about 1 mile north-east of the centre. Other landmarks nearby include Baynard's Castle (3.2 miles north-east) and Harrods (0.7 miles north). The countryside around Chelsea includes Campden Hill and Battersea Park Lake.
What the job involves on each surface
Flats and HMOs
In flats and HMOs, the walls and floors between homes and common areas need sealing where services pass through. We work through the gaps on your assessment, flat by flat if needed.
Service penetrations
Different services need different details: metal pipes, cables and plastic pipes are not treated the same. Each one is sealed to the product’s tested detail.
What affects the cost of fire rated sealant
The price is agreed before any work begins. It takes into account:
- Access and height
- Working hours on commercial sites
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
What to tell us when you ask for a quote:
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
- Whether it’s a home or a business
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.