Greater London · England

Fire-rated sealant in Willesden Green, Greater London

Fire rated sealant in Willesden Green from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.

  • Ordinary sealant used where a fire-rated product was needed
  • Damaged fire sealant left by other trades
  • Gaps around pipes and cables through fire-resisting walls

Fire rated sealant in Willesden Green

Different surfaces, different methods

Masonry and concrete

Brick, block and concrete walls and floors are sealed with products tested in masonry. We clean out dust and debris before sealing.

Flats and HMOs

In occupied buildings, we plan the order of work with you. We agree access to each flat and the common parts before any work starts.

Fire rated sealant in Willesden Green, done properly

Where services or frames pass through a fire-resisting wall or floor, the gap around them needs a fire-rated seal. Each gap is sealed to the product maker’s tested detail for its size and substrate, with a record of the products and locations if you need one. If you have joints picked up in a fire-stopping survey and linear gaps at the head of walls, we can help, whatever the surface.

London’s offices, shops, hotels, student accommodation and blocks of flats all have joints to look after, whether that’s washroom resealing or fire-rated sealant around service openings. Where a building in Willesden Green needs to stay open, work can be planned outside normal hours.

Your job is guaranteed for a year, as with all our work.

The Mr Mastic team in navy uniforms in front of three Mr Mastic vans
Place
Willesden Green (NW10, NW2, NW6)
Wider area
Greater London
Guarantee
12 months on all our work
Quotes
Quoted before any work starts
Phone
0345 464 0079
Last updated
26 October 2026

Why deal with it now?

Waiting for the next refit can leave a gap open for years. On its own, sealing it now is a small job that doesn’t depend on other work. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.

Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.

Why book with us

  • Domestic, commercial and hotel work
  • 12-month guarantee on every job
  • ARBOMaster approved applicator
  • Over 20 years’ experience

Read what affects the cost and our reviews.

FAQs for Willesden Green

Can parking be tricky for a visit in Willesden Green?

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 Willesden Green?

Yes, hospitality work, including hotels, is part of what we do. Work can be planned room by room, and out-of-hours working can be arranged.

Do I have to be there?

For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.

Do you offer different sealant colours?

Yes. White, clear and grey are common, and other colours are available for many products, and we will agree it with you first.

Do you come to Willesden Green?

Yes. We work in Willesden Green. For a quote, ring 0345 464 0079 or send us an email.

Will you leave a mess?

No. We work neatly, protect the area around the joints and tidy up afterwards.

Is the work guaranteed?

Yes. Every job comes with a 12-month guarantee.

Can you fill the gap behind a fire door frame?

Yes. We seal the gap between the frame and the wall with a suitable fire-rated product following the tested details. The door leaf and its hardware need a door specialist.

Aftercare tips

To keep the joints looking good and working properly:

  • Keep the record of products and locations with your fire safety documents
  • Plan fire stopping into any work that goes through walls or floors
  • Ask which product was used before you paint
  • Report cracked or damaged seals as soon as you notice them

File the record of locations and products with your fire safety paperwork. It helps whoever checks the building next.

Any job that breaks through a wall or ceiling should include resealing. Catching it then saves a separate visit later.

DIY versus a professional finish

The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.

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 fails, we can still redo it.

What sealant work cannot fix

We will always be straight with you, so here’s what new sealant won’t do:

  • Certifying a building or signing off its fire safety
  • Large holes that need a different fire-stopping system
  • A wall that is not a fire-resisting element to begin with

If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before booking.

What we seal

  • Door frames
  • Linear gaps
  • Plasterboard & masonry
  • Flats & HMOs
  • Service penetrations
  • Pipe & cable gaps

Signs you need fire rated sealant in Willesden Green

Sealant applied too thin, without the backing its detail needs, or onto dust will not perform as it was tested. Rushed fire stopping is common particularly when it was the last job before handover.

People generally contact us after spotting something like this:

  • Old fire sealant that has split or come away
  • Damaged fire sealant left by other trades
  • Door frames with gaps between frame and wall
  • Ordinary sealant used where a fire-rated product was needed

Managing a site like Donnington Primary School? Then gaps opened by contractors for new cabling are a common finding in schools and offices.

What to look for in a quote

  • Are they insured?
  • What the cure time is
  • Whether they seal over old material or remove it
  • Whether you can choose the colour

10 questions to ask before you book

What fire rated sealant looks like in Willesden Green

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, which is often where open fire-stopping gaps are first noticed. We work to the specification you’re given, installing the product to its tested details. There are hotels and other places to stay in and around Willesden Green. Hotel work can be planned room by room, with out-of-hours working where needed.

Willesden Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Letting a property close to Kensal Rise station? Then new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant.

Willesden Green is about 1 mile south-east of Neasden, in Greater London. We carry out fire rated sealant for homes and businesses in Willesden Green and the surrounding area. Willesden Green is one of 764 places in Greater London where we work. We also work in London, around 7 miles away.

Postcode districts we cover here for fire rated sealant: NW10, NW2 and NW6. You’ll find streets such as Fry Road, High Road and Dean Road, all of which we cover. Other places close to Willesden Green include Willesden (1 mile north), College Park (1 mile south), Kensal Green (1 mile south), Harlesden (1 mile south-west) and Kensal Rise (1 mile south-east). Further out, we also cover London (7 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (3 miles south-east), St Pancras (5 miles east) and Shoreditch (7 miles east).

Local landmarks in Willesden Green

We work in homes and buildings around Roundwood Park, Brondesbury College and Capital City Academy, among other places. The closest station to Willesden Green is Kensal Rise station, roughly 0.7 miles south-east of the centre. Nearby you will also find O2 Centre (2.2 miles east) and Brent Museum and Archives (within half a mile north). For a walk, there’s Campden Hill and Westbere Copse.

Map of Willesden Green © OpenStreetMap contributors

How the visit works

You do not need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the job takes a few hours for a handful of gaps, and longer for a whole building for a typical job. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.

  1. We start with the survey or action list, checking the size and surfaces of every gap.
  2. We remove any old or unsuitable filler and clean the gap.
  3. Where the tested detail needs backing or fill, we fit it.
  4. Fire-rated or intumescent sealant is applied to the right depth and tooled.
  5. Locations and products are noted so you have them on file.

Preparing for the visit

  • Mention if the joints have been sealed before
  • Tell us about access, such as stairs, a lift or high-level joints
  • Move anything stored near the joints

Get a quote

It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or send us an email.

Get a price

Read more

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job