Greater London · England
Fire Rated Sealant in St James's
Specialist fire rated sealant for St James's: careful preparation, the right product and tidy work. Call for a quick quote.
- Joints picked up in a fire-stopping survey
- Gaps around pipes and cables through fire-resisting walls
- Ordinary sealant used where a fire-rated product was needed
What the job involves on each surface
Service penetrations
A copper pipe, a cable and a plastic pipe can all need different fire-stopping details. We follow the manufacturer’s tested detail for each, and tell you if sealant alone isn’t the right fix.
Flats and HMOs
Flats and HMOs rely on fire separation between homes and the common parts. We work through the gaps on your assessment.
Fire rated sealant in St James's, done properly
A fire seal relies on being installed the way it was tested: the right depth, the right backing and the right product for the substrate. That is the part we focus on, one gap at a time. If you’re dealing with gaps left after a refit or conversion and seals cut through by electricians, plumbers or data installers, we can help, on pipe & cable gaps, door frames and service penetrations alike.
In London’s blocks of flats, service risers and common parts have pipes and cables passing through walls and floors. For managing agents and building owners in St James's, that can mean fire-rated sealant around service openings as well as resealing in shared washrooms and kitchens.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Location
- St James's (W1F, W1D, W1J)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near St James's
More services for St James's
St James's: your questions answered
Do you take on hotel work around St James's?
Yes. Hotel and guest-house work is part of what we do. Jobs can be programmed room by room, with out-of-hours working possible to arrange.
Is parking a problem for a job in St James's?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
How long does fire rated sealant take?
Typically it takes a few hours for a handful of gaps, and longer for a whole building. Larger jobs naturally take longer.
Is the work guaranteed?
Yes: twelve months. If anything isn’t right with the work within the year, let us know and we will sort it.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Can ordinary silicone be used in a fire-stopping gap?
No. A gap that needs fire stopping needs a tested fire-rated product fitted to the maker’s details.
Why act early in St James's
Leaving a gap until a refurbishment comes round can mean years with it open. On its own, sealing it now is a small job that does not depend on other work. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in St James's, the repair is bigger than the sealant job would have been.
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in St James's
- 20+ years of sealant experience
- 4.9 on Google from 180+ five-star reviews
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
Take a look at what affects the cost or what customers say.
What affects the quote in St James's
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- The product the joint needs
- How many rooms, windows or areas are involved
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Helping us quote
Photos help, but a description is a good start. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- Whether it has been sealed before
- Whether it’s a home or a business
For fire rated sealant in St James's, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
What we do, step by step
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the job takes a few hours for a handful of gaps, and longer for a whole building in most cases. In a London area like St James's, 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.
- Anything that isn’t fit for the job comes out, and the gap is cleaned.
- 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.
- We record the locations and products used for your records.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
- Clear items away from the joints we are working on
Get a quote
Need a quote? Please ring 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Landlord and commercial work in St James's
If you manage several properties in or around St James's, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Check whether a sealant can be painted before decorating over it
- Flag any open gap you spot round a pipe or cable
- Photograph sealed gaps before they’re covered up
- File the fire-stopping record where your assessor can find it
Don’t drill through or remove a fire seal without putting it back properly. New services through a sealed wall should include fire stopping in the plan.
A flagged gap shouldn’t wait for the next assessment. Get it sealed and recorded so you can show it was dealt with.
When it is not the sealant
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Fire doors that need new seals, closers or hardware
- Walls or floors that weren’t built to resist fire
- Big openings where sealant alone isn’t the tested solution
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Service penetrations
- Pipe & cable gaps
- Linear gaps
- Plasterboard & masonry
- Flats & HMOs
- Door frames
Fire rated sealant around St James's
St James's has hotels and guest accommodation in and around it. Hotel work can be planned room by room, with out-of-hours working where needed. Many London buildings have tight access and loading restrictions, and out-of-hours working is possible to arrange.
For buildings such as St James’s Church, service openings in its walls need the right fire-rated sealant, as in any building. Managing a site like Soho Parish CofE Primary School? Then service openings in fire-resisting walls need checking after any refurbishment. As a London address, St James's can be tricky for parking: let us know about parking bays, permits or a driveway.
St James's is about 1 mile south-east of City of Westminster, in Greater London. If you need fire rated sealant in St James's, please ring 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base, St James's included. Across Greater London, we cover 764 places, and St James's is one of them.
We work across W1F, W1D and W1J for fire rated sealant. Streets in the area include Duck Lane, Bruton Lane and Bridle Lane, all of which we cover. You’ll find St James's on the A4 and A400, so it’s easy for us to get to. Other places close to St James's include Chinatown (1 mile north), Charing Cross (1 mile east), Soho (1 mile north), West End (1 mile north-east) and Burlington Estate (1 mile west). We also work in nearby towns such as Kensington (3 miles west), Shoreditch (3 miles north-east), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles east) and Hampstead (4 miles north-west).
Local landmarks in St James's
In St James's, that means homes and buildings near LITE Regal International School, Tom Cribb pub and London Library. You’ll also find Harris Westminster Sixth Form (0.6 miles south) and St Anne's Churchyard (under half a mile north). St James's has its own railway station: London Charing Cross station. Well-known places in the area include The Museum of Practical Geology (less than half a mile north-west) and Montfichet's Tower (1.4 miles east). Green spaces nearby include St. James's Park Lake and Ludgate Hill.