Greater London · England
Custom House Fire Rated Sealant
Fire rated sealant for Custom House, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Old fire sealant that has split or come away
- Door frames with gaps between frame and wall
- Fire stopping disturbed by later work
How we handle fire rated sealant in Custom House
We do not assess buildings or decide what fire stopping is needed; your assessor, designer or building control sets that out. Our part is applying the specified sealant carefully, to the right depth and with the right backing. We work on plasterboard & masonry, door frames and linear gaps, and common reasons people get in touch are joints picked up in a fire-stopping survey and gaps where walls meet ceilings or slabs.
Commercial work in London comes with its own logistics: loading restrictions, building rules and tight access. For a building in Custom House, we agree timings and access before anything starts, and room-by-room programmes can be planned where needed.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Custom House (E16, E13)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
In fairness, there are a few things sealant won’t fix:
- Fire risk assessments, which need a qualified assessor
- Large holes that need a different fire-stopping system
- Certifying a building or signing off its fire safety
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Service penetrations
- Flats & HMOs
- Plasterboard & masonry
- Door frames
- Linear gaps
- Pipe & cable gaps
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Leave it or put it right?
Doing it once, properly, beats doing it twice. If the details weren’t followed, the seal may need redoing once someone inspects it. 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.
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
Why us?
- Tidy, careful work
- More than 20 years in sealant work
- Every job guaranteed for a year
- Approved under the ARBOMaster scheme
Take a look at what affects the cost and what customers say.
Quotes for fire rated sealant in Custom House
Every job gets its own quote. This is what makes a difference:
- When we can work, for business premises
- Whether there’s mould to deal with
- How many areas need sealing
- Which sealant suits the joint
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- The rough size of the job
- Any previous sealing or DIY work
- How we’d reach the joints
- Where the property is
Every job is quoted individually. Just call 0345 464 0079 or drop us an email with the details.
What happens on the day
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before work begins. The work generally takes anything from a few hours to several days, depending on how many gaps there are. In a London area like Custom House, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We go through the gaps on your list or survey and check each one’s size and substrate.
- Old or unsuitable sealant is cut out and the gap cleaned.
- We put in whatever backing or fill the product detail specifies.
- We apply the fire-rated or intumescent sealant to the specified depth and tool it.
- Locations and products are noted so you have them on file.
Before we arrive
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
Get a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Advice
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Check whether a sealant can be painted before decorating over it
- Store the list of sealed gaps with your building paperwork
- Report cracked or damaged seals as soon as you notice them
- Allow for resealing whenever new services are run
Avoid covering a sealed gap with anything that is not part of the tested detail. If it needs repair, use the same type of product. We can tell you which product we used.
It’s easiest to seal gaps while they’re few and easy to reach. Leave them and each new job adds another hole and the job gets bigger.
Common questions in Custom House
Can you help a landlord with a rental near Custom House station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Do you work for hotels and guest houses in Custom House?
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.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all.
Where is Mr Mastic based?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
What the job involves on each surface
Plasterboard walls
Holes in plasterboard are often cut roughly for services. Where a hole is bigger than the sealant’s tested range, it needs another approach and we’ll flag it.
Service penetrations
Different services need different details: metal pipes, cables and plastic pipes aren’t treated the same. Each one is sealed to the product’s tested detail and we flag any that need another system.
Fire rated sealant around Custom House
Custom House has hotels and guest accommodation in and around it. Hotel work can be planned room by room, with out-of-hours working where needed. 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.
For buildings such as St Matthew's Church, gaps around pipes and cables are worth checking after any building work there. Rented homes near Custom House station change hands often, and fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through. Managing a site like St Joachim's Catholic Primary School? Then fire-stopping around service openings should be restored whenever new services go in.
Custom House is about 1 mile south of Canning Town, in Greater London. Whether you’re in the middle of Custom House or further out, we cover fire rated sealant for every kind of property, from flats and houses to offices and hotels. Custom House is one of 764 towns and villages in Greater London we cover for fire rated sealant.
Jobs for fire rated sealant in E16 and E13 works the same way as everywhere else we cover. If you need fire rated sealant at a property on Tree Road, Ethel Road and Booth Road or anywhere close by, our applicators can take on the job. With the A1020 close by, Custom House is simple for us to get to for fire rated sealant. Nearby, we also carry out fire rated sealant in West Silvertown (1 mile south-west), Silvertown (1 mile south), Canning Town (1 mile north), Royal Docks (1 mile east) and Limmo Peninsula (1 mile west). Within a short drive, we also cover London (5 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (6 miles west) and Shoreditch (5 miles west).
Local landmarks in Custom House
Typical jobs here are in homes near Thames Barrier Park, The Royal Docks Community School and Royal Docks Academy and the streets around them. There’s a railway station in Custom House itself: Custom House station. Nearby you will also find Gallions Reach Shopping Park (2.2 miles east) and Charlton Athletic Museum (1.5 miles south). Green spaces nearby include Gilbert's Pit and Tower Hill.