Greater London · England
High Barnet Commercial Sealant
Commercial sealant for High Barnet and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Silicone laid over old silicone by a previous contractor
- Tired sealant in let properties
- Too many rooms to reseal without closing the building
Commercial sealant for homes and businesses in High Barnet
Landlords and agents with several properties can have bathrooms and kitchens resealed between tenancies. Several addresses can go on one quote. We work on retail & leisure sites, hotel bathrooms and rental portfolios, and common reasons people get in touch are mouldy washroom sealant that staff and guests notice and split sealant where wet room floors meet walls.
London’s offices, shops, hotels, student accommodation and blocks of flats all have joints to look after, from washroom silicone to fire-rated sealant around pipes and cables passing through walls. Where a building in High Barnet needs to stay open, work can be planned outside normal hours.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or send us an email.
- Location
- High Barnet (EN5)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Different surfaces, different methods
Student & care accommodation
Vacant rooms make resealing quick and simple, but occupied rooms can be planned in as well.
Welfare facilities
Busy staff showers wear sealant out quickly. We reseal with anti-fungal sanitary silicone, accessible showers included.
What affects the cost of commercial sealant
Call for a quick quote. The main things that affect it are:
- How many areas need sealing
- The size of the job
- Whether the work is at height
- 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. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- Roughly how big the job is
- Where the property is
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before we start.
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes as long as the scope needs, from one welfare room to a full building, including the tidy-up. For a job in High Barnet, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First we visit and agree the scope, the sequence and the working hours.
- Every area is sheeted and the old silicone stripped out.
- Joints are cleaned, treated for mould and dried.
- We lay the right sealant for each area, with anti-fungal silicone in wet rooms.
- We check every room and give its cure time for housekeeping.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
Ask for a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Read more
Your questions about commercial sealant in High Barnet
Is High Barnet in your area for commercial sealant?
Yes. Our work covers London and the South East, and High Barnet is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
Is parking a problem for a job in High Barnet?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Does commercial work come with a guarantee?
Yes. Our one-year guarantee covers commercial work too.
Is out-of-hours working possible?
Early starts and out-of-hours work can be arranged. Tell us what you need when you ask for a quote.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Can you match the sealant colour?
We’ll suggest a colour to suit the surroundings. The product needed can limit the range.
Do you provide RAMS?
Let us know which documents your site needs, such as method statements, risk assessments or insurance details, and we’ll confirm what we can provide when we quote.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Landlord and commercial work in High Barnet
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Pass on the cure time to whoever cleans the rooms
- Encourage users to squeegee shower walls
- Keep strong chemicals and scourers off the joints
- Don’t leave a failed joint until the next refurbishment
Daily cleaning with harsh chemicals shortens the life of any sealant. A mild cleaner and a soft cloth is enough for the joints, with stronger products kept off the bead.
Water from a failed shower seal can travel: into ceilings below, walls next door and service voids. Dealing with the joint early stops that spread.
What sealant work cannot fix
To be straight with you, some problems need a different trade:
- Leaking pipework, valves or wastes (a plumber’s job)
- A broken extractor fan behind the mould problem
- Damaged sanitaryware that needs replacing
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Hotel bathrooms
- Rental portfolios
- Office washrooms & kitchens
- Student & care accommodation
- Welfare facilities
- Retail & leisure sites
Workplaces and buildings in High Barnet
London’s water is hard, so limescale builds up on sealant, grout and fittings. Many London buildings have tight access and loading restrictions, and out-of-hours working is possible to arrange.
If you let a flat or house near Hadley Wood station, we can quote for one property or a whole portfolio of rentals. High Barnet is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Community buildings like Christ Church are part of the picture too: halls and community kitchens see heavy use, and their sealant shows it.
High Barnet is about 1 mile north-west of Barnet, in Greater London. Jobs in High Barnet get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 764 places across Greater London, large and small. You can also see our page for London, about 12 miles away.
We work across EN5 for commercial sealant and the streets around it. If you need commercial sealant at a property on Byng Road, Park Road and Kings Road or anywhere close by, our applicators can take on the job. With the A1081 close by, High Barnet is easy for our applicators to reach. Neighbouring places we cover for commercial sealant include Hadley (1 mile east), Arkley (1 mile south-west), Kitts End (1 mile north), Totteridge (1 mile south) and Rowley Green (2 miles west). Larger places within reach include London (12 miles south-east), City of Westminster (10 miles south), Marylebone (10 miles south), Kensington (11 miles south), St Pancras (10 miles south-east) and Shoreditch (11 miles south-east).
Near you in High Barnet
In High Barnet, that means homes and buildings near Susi Earnshaw Theatre School, The White Lion pub and Queen Elizabeth's School. The closest station to High Barnet is Hadley Wood station, roughly 1.6 miles north-east of the centre. A little further out are Spires Shopping Centre (under half a mile east) and Barnet General Hospital (0.5 miles south-west). Open spaces near High Barnet include Barnet Countryside Centre and Darland's Lake.
Why act early in High Barnet
Guests and staff judge a building by its bathrooms. Black sealant makes a clean room look dirty, and scrubbing won’t fix it. New sealant does. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in High Barnet, the repair is bigger than a sealant job.
Leaving a failed joint generally makes the job bigger, not smaller. If you’re not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Why choose Mr Mastic in High Barnet
- Colour picked to suit the job
- Rated 4.9 stars on Google
- 12-month guarantee on every job
- Approved under the ARBOMaster scheme
See our cost guide and what customers say.