Greater London · England
Fire-rated sealant in Hampstead, Greater London
Fire rated sealant across Hampstead and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Joints picked up in a fire-stopping survey
- Ordinary sealant used where a fire-rated product was needed
- Gaps where walls meet ceilings or slabs
Fire rated sealant in Hampstead, done properly
We can work through a building room by room or floor by floor, noting the locations and products as we go. That record is useful for your files and for whoever looks at the building next. We work on pipe & cable gaps, door frames and plasterboard & masonry, and common reasons people get in touch are old fire sealant that has split or come away and seals cut through by electricians, plumbers or data installers.
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 Hampstead, that can mean fire-rated sealant around service openings as well as resealing in shared washrooms and kitchens.
Whatever the size of the job, you get the same 12-month guarantee.
- Location
- Hampstead (NW3, NW6, NW11, N2)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Fire rated sealant in Hampstead: local notes
Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange. 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 are given, installing the product to its tested details.
As a London address, Hampstead can be tricky for parking: let us know about parking bays, permits or a driveway. Letting a property close to Finchley Road & Frognal station? Then new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. If you look after a church, hall or community building such as St John-at-Hampstead church, gaps around pipes and cables are worth checking after any building work there.
Hampstead is about 3 miles north-west of City of Westminster, in Greater London. From the centre of Hampstead to the outskirts, we cover fire rated sealant for every kind of property. Our Greater London coverage runs to 764 places, and Hampstead is one of them.
We cover every part of the NW3, NW6, NW11 and N2 postcode area for fire rated sealant. Streets in the area include Hampstead High Street, New End Square and The Mount Square, all of which we cover. Hampstead is on the A1 and A502, so it’s easy for us to get to. Nearby, we also carry out fire rated sealant in Greenhill (1 mile north-east), West Hampstead (1 mile west), Fortune Green (1 mile west), Vale of Health (1 mile north) and South Hampstead (1 mile south). We also work in nearby towns such as London (5 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (3 miles south-east) and Shoreditch (5 miles south-east). Being one of Greater London’s larger places, Hampstead has homes, rented property and businesses of every kind.
Local landmarks in Hampstead
Locally, jobs take us to homes and businesses close to South Hampstead High School, Kilburn Grange Park and St Anthony's Preparatory School, among other places. You’ll also find King William IV Public House (within half a mile north-east) and Cecil Sharp House (1.7 miles south-east). Hampstead has its own railway station: Finchley Road & Frognal station. Well-known places in the area include Isokon Gallery (0.8 miles east) and New End Hospital (within half a mile north). Not far away are Belsize Wood and The Long Water.
How the job changes by surface
Masonry and concrete
Masonry is dusty and porous, so preparation matters. The gap is cleaned and backed where required before applying the sealant.
Linear gaps
Some linear gaps have to cope with movement as well as fire. The product and depth are chosen to suit both, following the tested detail.
Also near Hampstead
What else we do in Hampstead
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Keep pictures of seals that will be hidden
- Ask which product was used before you paint
- Check risers, ceiling voids and cupboards during building checks
- Plan fire stopping into any work that goes through walls or floors
Follow the cure time we give you before decorating over the sealant. Some fire-rated sealants can be painted and some can’t, so ask us which we used.
Small gaps around services are simple to deal with while there are only a few. Leave them and each new job adds another hole and the job gets bigger.
Landlord and commercial work in Hampstead
For anyone letting property in or around Hampstead, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Hampstead: your questions answered
Can parking be tricky for a visit in Hampstead?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can you help a landlord with a rental near Finchley Road & Frognal station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Is intumescent sealant the same as fire-rated sealant?
An intumescent sealant expands when it gets hot. Intumescent sealants are one kind of fire-rated sealant; which product suits depends on the gap, the substrate and the service.
Can I do it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Are you insured?
Yes. Mr Mastic is fully insured.
Where are you based?
We work from Crawley. Our applicators cover Hampstead, along with the rest of our area.
Can you tell me which gaps need fire stopping?
No. We follow the requirements from your assessor, designer or building control, and apply each product to its tested details.
Do you cover Hampstead?
Yes. We work in Hampstead and the rest of Greater London. To book, call 0345 464 0079 or email us.
How we quote for fire rated sealant
The quote reflects the job in front of us. We look at:
- The type of sealant required
- Mould in or behind the old joints
- Any working-time requirements on site
- The number and length of the joints
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Whether it has been sealed before
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- Where the job is, and your postcode
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
If you are 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.
How the visit works
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we’ve agreed what’s being done, we protect the area and start. It normally takes a few hours for a handful of gaps, and longer for a whole building. In a London area like Hampstead, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re 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.
- Dust and loose debris are cleaned from each gap.
- 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.
How to prepare
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
- Clear items away from the joints we are working on
Ask for a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or send us an email.
Read more
Why deal with it now?
Leaving a gap until a refurbishment comes round can mean years with it open. Sealing the gap now is a contained job on its own. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- 20+ years of sealant experience
- Quality sealants from Arbo and Everbuild
- ARBOMaster approved applicator
- Every job guaranteed for a year
Read our cost guide and what customers say.