Greater London · England
Fire-rated sealant in Harrow, Greater London
Fire rated sealant for Harrow, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps where walls meet ceilings or slabs
- Seals cut through by electricians, plumbers or data installers
- Gaps filled with a product that isn’t fire-rated
Fire rated sealant in Harrow
Door frame gaps, linear joints and holes around services all have their own details. We check the size and the substrate before choosing the product, then the sealant goes in to the depth the product’s details set. If you are dealing with unsealed gaps around fire door frames and fire stopping disturbed by later work, we can help, whatever the surface.
Across London, offices, shops, hotels, student halls and blocks of flats all need sealant work from time to time, whether that is washroom resealing or fire-rated sealant around service openings. Where a building in Harrow needs to stay open, work can be planned outside normal hours.
All our work is covered by a 12-month guarantee, wherever you are in Greater London.
- Where
- Harrow (HA2, HA1, UB5, HA3)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to several days, depending on how many gaps there are from start to finish. In Harrow, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We begin by agreeing the list of gaps from your assessor’s or designer’s requirements.
- Each gap is measured and its substrate and service noted.
- Unsuitable material such as ordinary foam or silicone is cut out and the gap cleaned.
- The specified fire-rated sealant goes in over any backing its detail requires.
- Every location is recorded with the product used for your records.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
How to get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work and send you a clear quote.
Advice
Harrow: your questions answered
Do you work for landlords with property near Harrow-on-the-Hill station?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Do you work in hotels near Harrow?
Yes, hospitality work, including hotels, is part of what we do. Jobs can be programmed room by room, with out-of-hours working possible to arrange.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
How do I get a quote for fire rated sealant in Harrow?
Every job is different, so each one gets its own quote. To get one, ring 0345 464 0079 or drop us an email and let us know what needs doing and where.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Are you fully insured?
Yes. We are fully insured for domestic and commercial work.
Where do you work from?
Mr Mastic is based in Crawley. We cover Harrow and the rest of Greater London, along with the rest of our area.
What affects the quote in Harrow
We quote each job individually. This is what makes a difference:
- The old material and how stubborn it is
- Whether the work is at height
- Whether there’s mould to deal with
- How many areas need sealing
What it costs depends on the size of the job, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
To help us quote quickly, please include:
- How we’d reach the joints
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- The type of property
We don’t publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
Why it’s worth doing now in Harrow
A quick fill with any sealant to hand isn’t fire stopping. A fire-rated product only performs as tested when it’s installed to its tested detail, which is why we match the product and the method to each gap. 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 Harrow.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why Harrow clients choose us
- Neat joints and a tidy finish
- Any old sealant cut out fully, not covered over
- Experience in homes, commercial sites and hotels
- Sanitary silicone with an anti-fungal additive in wet areas
DIY versus a professional finish
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
For landlords and businesses
Landlords and letting agents in Harrow can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
When something else is needed
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Large holes that need a different fire-stopping system
- Doors that are not fire doors in the first place
- Sign-off of the building, which sits with building control or your assessor
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Pipe & cable gaps
- Service penetrations
- Flats & HMOs
- Door frames
- Plasterboard & masonry
- Linear gaps
Commercial buildings in Harrow
There are hotels and other places to stay in and around Harrow. 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 apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
Schools such as Whitmore High School are buildings too, and service openings in fire-resisting walls need checking after any refurbishment. For buildings such as Church of St Peter, gaps around pipes and cables are worth checking after any building work there. Rented homes near Harrow-on-the-Hill station change hands often, and any gap left by new services in shared walls should be closed with a fire-rated product.
Harrow is about 7 miles south of Watford, in Greater London. For fire rated sealant in and around Harrow, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Greater London from our Crawley base, Harrow included. Harrow is one of 764 places in Greater London where we work. London is on our list too, about 12 miles from Harrow.
All of HA2, HA1, UB5 and HA3 is covered for fire rated sealant, from the main roads to the quietest streets. Local streets include High Street, London Road and Perceval Square, all of which we cover. Harrow sits on or near the B457 and B458, which makes travel easy. Other places close to Harrow include Roxeth (1 mile south), South Harrow (1 mile south), North Harrow (1 mile north-west), Harrow on the Hill (1 mile south-east) and Rayners Lane (1 mile west). Further out, we also cover London (12 miles south-east), City of Westminster (9 miles south-east), Marylebone (10 miles south-east), Kensington (8 miles south-east), St Pancras (11 miles east) and Shoreditch (12 miles east).
Local landmarks in Harrow
Locally, jobs take us to homes and businesses close to Kingsfield Arms, Grange Primary School and Northwick Park and the streets around them. The closest station to Harrow is Harrow-on-the-Hill station, about 0.7 miles north-east. Other landmarks nearby include St. George's Shopping Centre (0.7 miles north-east) and Clementine Churchill Hospital (1 mile south-east). The countryside around Harrow includes Islip Manor Meadows and Northala Fields.
Also in Harrow
Keeping the joints in good condition
Looking after new joints is easy:
- File the fire-stopping record where your assessor can find it
- Keep general-purpose foam and caulk away from fire-stopping gaps
- Check whether a sealant can be painted before decorating over it
- Flag any open gap you spot round a pipe or cable
Include fire stopping in your regular building checks. Look for cracks, gaps or sealant that has been cut or pulled out and get them seen to.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Doing it at the time avoids leaving gaps behind.