Greater London · England
Fire Rated Sealant in Underhill
Our applicators work in Underhill on intumescent and fire-rated sealant around gaps, frames and service penetrations. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- New service routes left unsealed after building work
- Joints picked up in a fire-stopping survey
- Open gaps behind door architraves
About our fire rated sealant in Underhill
Landlords, managing agents and facilities teams use us for the sealant items on a fire risk assessment. If you share the list, we can quote for the gaps that need fire-rated sealant. If you are dealing with gaps filled with a product that isn’t fire-rated and gaps around pipes and cables through fire-resisting walls, we can help, on door frames, plasterboard & masonry and linear gaps alike.
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 Underhill, that can mean fire-rated sealant around service openings as well as resealing in shared washrooms and kitchens.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Location
- Underhill (EN5, N20)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Landlord and commercial work in Underhill
We also work for property managers and facilities teams in Underhill and across Greater London. Several sites can go on one quote, and we’re fully insured.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
How it works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a handful of gaps, and longer for a whole building. In Underhill, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start with the survey or action list, checking the size and surfaces of every gap.
- Old or unsuitable sealant is cut out and the gap cleaned.
- Backing or fill is fitted where the product’s tested detail calls for it.
- Fire-rated or intumescent sealant is applied to the right depth and tooled.
- Locations and products are noted so you have them on file.
Before we arrive
- Keep pets and children clear of the area while we work
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will explain what’s involved and give you a clear price.
Advice
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Issuing a fire rating or certificate for a building
- Openings too large for sealant, which need batts, boards or another system
- Deciding what fire stopping a building needs
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Service penetrations
- Door frames
- Pipe & cable gaps
- Plasterboard & masonry
- Flats & HMOs
- Linear gaps
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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.
How to look after the new joints
Looking after new joints is easy:
- Store the list of sealed gaps with your building paperwork
- Allow for resealing whenever new services are run
- Never patch a fire seal with standard sealant
- Make resealing part of every contractor’s brief
Do not add foam, filler or ordinary sealant over a fire seal. Repairs should use a matching fire-rated product. We can tell you which product we used.
Open gaps do not only matter in a fire: noise, draughts and even pests can come through too. Dealing with them early helps with all of these.
Why it’s worth doing now in Underhill
Fire-rated sealants are less forgiving than ordinary ones. Depth, backing and surface preparation all affect how a seal performs, so we follow the maker’s details on every gap. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Underhill, the repair is bigger than the sealant job would have been.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
What you get with us
- Tidy, careful work
- 20+ years of sealant experience
- Anti-fungal silicone where joints get wet
- Experience in homes, commercial sites and hotels
See our cost guide or what customers say.
What affects the quote in Underhill
We quote each job individually. These are the things that affect it:
- Which sealant suits the joint
- The number and length of the joints
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Roughly how big the job is
- The type of property
- Where the job is, and your postcode
- What’s wrong with the joints now
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
What fire rated sealant looks like in Underhill
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 apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details. Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange.
As a London address, Underhill can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Community buildings like St John the Baptist Church are part of the picture too: older buildings that have had new heating or wiring often have service gaps worth checking. Letting a property close to New Barnet station? Then any gap left by new services in shared walls should be closed with a fire-rated product.
Underhill is about 1 mile west of Barnet, in Greater London. If you need fire rated sealant in Underhill, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We’re based in Crawley and cover Greater London, Underhill included. 764 places in Greater London are on our list, from the larger towns to small villages. You can also see our page for London, roughly 11 miles from Underhill.
Every address in EN5 and N20 is covered for fire rated sealant, from the main roads to the quietest streets. You will find streets such as Park Road, May's Lane and Manor Road. We also cover the places around Underhill: Barnet (1 mile east), New Barnet (1 mile east), Monken Hadley (1 mile north), Hadley Wood (1 mile north-east) and Cockfosters (2 miles east). We also work in nearby towns such as London (11 miles south-east), City of Westminster (9 miles south), Marylebone (9 miles south), Kensington (10 miles south), St Pancras (9 miles south) and Shoreditch (10 miles south-east).
What’s near Underhill
In Underhill, that means homes and buildings near Susi Earnshaw Theatre School, Highlands Gardens and The Red Lion pub, among other places. For rail, the closest station is New Barnet station, about 1 mile east of the centre. Well-known places in the area include Francis Skaryna Belarusian Library and Museum (2.2 miles south) and Barnet General Hospital (0.9 miles west). Green spaces nearby include Greenhill Gardens and Darland's Lake.
Questions from Underhill
Is parking a problem for a job in Underhill?
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.
Do you work for landlords with property near New Barnet station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Can you tell me which gaps need fire stopping?
No, we do not assess buildings. When your assessor or designer has set out what’s needed, we can quote for the fire-rated sealant items.
What does fire rated sealant cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or send us an email with a short description of the job.
Can you work in occupied buildings?
Yes, whether the building is a school, an office, flats or an HMO, and whether it’s in use or not. Let us know the building’s hours and we’ll plan the work to suit.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access.