Greater London · England
Mayfair Fire Rated Sealant
Intumescent and fire-rated sealant around gaps, frames and service penetrations in Mayfair, with a one-year guarantee on every job. Call for a quick quote.
- Open holes round services passing through fire walls
- Fire stopping disturbed by later work
- New service routes left unsealed after building work
How we handle fire rated sealant in Mayfair
Fire stopping only performs as intended if it’s done to the detail: correct depth, correct backing and a product suited to the surfaces. That is the part we focus on. We work on service penetrations, flats & HMOs and door frames, and common reasons people get in touch are open holes round services passing through fire walls and old fire sealant that has split or come away.
London blocks of flats carry pipes and cables through walls and floors in their common parts and service risers. For managing agents and building owners in Mayfair, that can mean fire-rated sealant around service openings as well as resealing in shared washrooms and kitchens.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Mayfair (W1K, W1F, W1U)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
New sealant cannot fix everything, and we will tell you before we start. It will not solve:
- Walls or floors that weren’t built to resist fire
- Large holes that need a different fire-stopping system
- Sign-off of the building, which sits with building control or your assessor
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
Surfaces we seal
- Service penetrations
- Plasterboard & masonry
- Flats & HMOs
- Pipe & cable gaps
- Door frames
- Linear gaps
Also in Mayfair
Fire rated sealant in Mayfair: local notes
There are hotels and other places to stay in and around Mayfair. For hotels, a room-by-room programme keeps most rooms in use while the work goes on. Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, which is often where open fire-stopping gaps are first noticed. We apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
If you let a flat or house near Bond Street station, fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through. Managing a site like LITE Regal International School? Then fire-stopping around service openings should be restored whenever new services go in.
Mayfair is about 1 mile south-east of City of Westminster, in Greater London. For fire rated sealant in and around Mayfair, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base. Our Greater London coverage runs to 764 places, Mayfair among them.
All of W1K, W1F and W1U is within our area for fire rated sealant, from the main roads to the quietest streets. Whether your property is on Park Lane, Bruton Lane and Market Mews or a nearby road, we can help. You’ll find Mayfair on the A4201 and A4202, which makes it straightforward to reach. If you’re just outside Mayfair, we cover Burlington Estate (1 mile east), City of Westminster (1 mile north-west), Marylebone (1 mile north), St James's (1 mile east) and Chinatown (1 mile east). Larger places within reach include Shoreditch (3 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west) and Ruislip (12 miles west).
Landmarks near Mayfair
Around Mayfair, our work takes us to homes and buildings near Royal College of Nursing Library & Museum, Coach and Horses pub and St George's Church of England Primary School. You will also find Green Park (0.5 miles south) and The St Marylebone CofE School (0.8 miles north). There’s a railway station in Mayfair itself: Bond Street station. A little further out are Montfichet's Tower (2 miles east) and London Eye Hospital (0.5 miles north). Open spaces near Mayfair include Ludgate Hill and St. James's Park Lake.
Why deal with it now?
Leaving a gap until a refurbishment comes round can mean years with it open. On its own, sealing it now is a small job and needn’t wait for anything else. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why choose Mr Mastic in Mayfair
- Experience in homes, commercial sites and hotels
- Over 20 years’ experience
- We never seal over old sealant
- ARBOMaster approved applicator
Read what affects the cost or what customers say.
Questions from Mayfair
Is parking an issue for fire rated sealant in Mayfair?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you work in hotels near Mayfair?
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.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Will we have a record of what was sealed?
Yes. Every gap we seal is listed with the product used.
What should I tell you?
Let us know what needs doing and where. We will ask anything else we need to know.
Do you cover Mayfair?
Yes. We are based in Crawley and work across South East England, London and Scotland, Mayfair included.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Can ordinary silicone be used in a fire-stopping gap?
No. Ordinary silicone, caulk or foam is not tested as fire stopping. If it’s been used, we remove it and use the right product.
What we’re called out for in Mayfair
Sometimes the wrong product was used from the start: general-purpose foam, everyday silicone or caulk in a place that needed a tested fire seal. It may look fine, but it isn’t a fire-rated seal.
The problems people generally mention when they call include:
- Linear gaps at the head of walls
- Standard silicone or caulk in a fire-stopping gap
- Gaps around pipes and cables through fire-resisting walls
- Gaps flagged on a fire risk assessment
Mayfair is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Whether you can choose the colour
- Who does the work, and how experienced they are
- Are they insured?
- What product goes in the joint
Work for landlords, hotels and businesses
If you manage several properties in or around Mayfair, several properties can go on one quote. Just tell us the addresses and what each one needs.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Different surfaces, different methods
Door frames
We deal with the gap around the frame, not the door. Doors, seals and closers are for a door specialist, and we’ll say if we spot a problem with them.
Linear gaps
Linear gaps run along the head of walls, at floor edges and between panels. They’re sealed with a fire-rated sealant over backing where the detail calls for it.
What we do, step by step
There isn’t much for you to do on the day. Show us the job and we will take it from there. The work itself takes anything from a few hours to several days, depending on how many gaps there are from start to finish. In a London area like Mayfair, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- 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.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Let us know about earlier repairs to the joints
- Mention any parking rules near the property
Get a quote
If you’re in Mayfair and need fire rated sealant, phone 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.