Greater London · England
Fire-rated sealant in North End, Greater London
Intumescent and fire-rated sealant around gaps, frames and service penetrations for householders, landlords and businesses in North End. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps where walls meet ceilings or slabs
- Sealant items on a fire risk assessment action list
- Fire seals that have cracked with movement
About our fire rated sealant in North End
Later work by other trades often breaks through fire stopping, especially in flats, HMOs, offices and schools. A new cable run or a replaced pipe can leave an open hole behind. Those are the gaps we close, using a tested fire-rated product. We work on linear gaps, plasterboard & masonry and door frames, and the jobs we see most are gaps around pipes and cables through fire-resisting walls and old fire sealant that has split or come away.
London’s offices, shops, hotels, student accommodation and blocks of flats all have joints to look after, from washroom silicone to fire-rated sealant around pipes and cables passing through walls. Out-of-hours working can be arranged where a building in North End can’t close.
Big or small, it’s backed by our one-year guarantee.
- Location
- North End (NW3, NW11, N2)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
North End questions
Do you work for hotels and guest houses in North End?
Yes, hotels and guest houses are among the places we work. Rooms can be done a few at a time, so the building stays open.
Can parking be tricky for a visit in North End?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
How do I get a quote for fire rated sealant in North End?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover North End.
Can ordinary silicone be used in a fire-stopping gap?
No. It might close the gap, but it is not a fire-rated seal. A tested fire-rated product is needed, or ask us to do it.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Do I need to be at home?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that generally means someone at home.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator.
How the job changes by surface
Flats and HMOs
Conversions normally leave a mix of old and new service holes. We seal the ones on your specification with a tested product and record where they are.
Door frames
The gap between a door frame and the wall around it needs sealing as well as the door itself. We fill it with a fire-rated product suited to the materials either side.
DIY sealant or a professional job?
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 doesn’t work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What we do, step by step
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take from a few hours to a few days, depending on the number of gaps and the access. For a job in North End, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- Access to each area is agreed so the work can run in order.
- We take out any damaged or unsuitable sealant.
- 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
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
How to 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’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
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Looking after it afterwards
So the new joints stay in good condition:
- Don’t paint over fire sealant until it has cured
- Keep the record of products and locations with your fire safety documents
- Keep photos of seals that will be hidden
- Tell trades working in the building that fire seals must be put back
Avoid covering a sealed gap with anything that isn’t part of the tested detail. Repairs should use a matching fire-rated product. Ask us if you’re not sure which product was used.
Any job that breaks through a wall or ceiling should include resealing. Catching it then saves a separate visit later.
Common problems we fix in North End
Lots of unsealed gaps appear long after the building was completed. New cables, pipes and data runs go through walls and ceilings and the hole round the new service is not always sealed again.
Any of these means the joints need attention:
- Open holes round services passing through fire walls
- Gaps where walls meet ceilings or slabs
- Damaged fire sealant left by other trades
- Sealant items on a fire risk assessment action list
If you look after a church, hall or community building such as Church of St Alban the Martyr, service openings in its walls need the right fire-rated sealant, as in any building.
What to look for in a quote
- What product goes in the joint
- What guarantee comes with the work
- Who turns up on the day
- Whether all the old sealant comes out first
Commercial buildings in North End
Commercial buildings in London often have strict access rules and limited loading, so out-of-hours working can be arranged where needed. There are hotels and other places to stay in and around North End. For hotels, a room-by-room programme keeps most rooms in use while the work goes on.
As a London address, North End can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Letting a property close to Hampstead Heath station? Then any gap left by new services in shared walls should be closed with a fire-rated product.
North End is about 1 mile north of Greenhill, in Greater London. We carry out fire rated sealant for homes and businesses in North End and nearby. North End is one of 764 towns and villages in Greater London where we work for fire rated sealant. You can also see our page for London, about 6 miles away.
Work in NW3, NW11 and N2 works the same way as everywhere else we cover. Whether your property is on Sandy Road, Park Avenue and Platt's Lane or a nearby road, our applicators can take on the job. Being close to the A502, North End is easy for our applicators to reach. Other places close to North End include Vale of Health (1 mile south-east), Childs Hill (1 mile south-west), Golders Green (1 mile north-west), Greenhill (1 mile south) and West Hampstead (1 mile south). Further out, we also cover London (6 miles south-east), City of Westminster (4 miles south), Marylebone (4 miles south-east), Kensington (5 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles south-east).
Local landmarks in North End
In North End, that means homes and buildings near The Old Bull and Bush pub, Childs Hill Park and The Henrietta Barnett School. North End’s nearest station is Hampstead Heath station, roughly 1.1 miles south-east of the centre. Nearby you’ll also find O2 Centre (1.4 miles south) and New End Hospital (0.7 miles south). Not far away are Turner's Wood and Darland's Lake.
Leave it or put it right?
An unsealed gap lets smoke and fire get round a wall that was built to hold them back. Sealing it properly restores what the wall was there to do, and the work involved is often modest. 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. Dealing with it early is far simpler for homes in North End.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or send us an email and we’ll talk you through it.
Why North End clients choose us
- Full insurance on every job
- An ARBOMaster approved applicator
- Every job guaranteed for a year
- Sanitary silicone with an anti-fungal additive in wet areas
Landlord and commercial work in North End
Landlords and agents in North End can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
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 be quoted together.