Greater London · England
Barnet Glazing Silicone
Glazing silicone for Barnet and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Water escaping where a screen meets the wall
- A quick top-up bead that didn’t last
- Leaks where conservatory glass meets the frame
How we handle glazing silicone in Barnet
Glazing joints need a sealant made for glass. We use a neutral-cure glazing silicone, which suits glass and most frame materials, finished with a neat, even bead. If you have water tracking down the inner face of the glass and shower screens leaking along the wall or tray, we can put it right, whatever the surface.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Barnet.
You get a one-year guarantee, the same in Barnet as everywhere else we work.
- Location
- Barnet (EN5, EN4, N20, N11)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Use gentle products around the joints
- Run a squeegee over the glass when you are done
- Avoid scraping close to the bead
- Use a gentle glass cleaner and a soft cloth
Use mild cleaners on and around the silicone. Strong solvents can soften or mark it.
Damp patches, drips and condensation along a joint are worth checking. The cause may be sealant or another part, and we’ll tell you which.
What the job involves on each surface
Glass balustrade bases
The base joint is cut out and resealed. We do not install or replace glass.
Rooflights
Rooflight leaks can come from the sealant or the roof. We check which it is.
Landlord and commercial work in Barnet
For anyone letting property in or around Barnet, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
Barnet homes and the weather
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
As a London address, Barnet can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For an older house near a landmark such as St John's United Reformed Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Barnet is about 9 miles east of Watford, in Greater London. Barnet gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Barnet is one of 764 towns and villages in Greater London where we work. We also work in London, around 11 miles away.
All of EN5, EN4, N20 and N11 is covered for glazing silicone, from the main roads to the quietest streets. We cover properties on Station Road, High Street and Sambroke Square and the roads around them. You will find Barnet on the B193 and A1081, which makes it straightforward to reach. We also cover the places around Barnet: Underhill (1 mile west), New Barnet (1 mile east), Monken Hadley (1 mile north-west), Hadley Wood (1 mile north-east) and Cockfosters (1 mile east). We also work in nearby towns such as London (11 miles south), 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).
Landmarks near Barnet
Typical jobs here are in homes near Queen Elizabeth's Girls' School, The Railway Tavern and Highlands Gardens. Barnet’s nearest station is New Barnet station, roughly 0.6 miles east. Well-known places in the area include Barnet General Hospital (1.2 miles west) and Francis Skaryna Belarusian Library and Museum (2.1 miles south). Open spaces near Barnet include Darland's Lake and Greenhill Gardens.
Leave it or put it right?
Topping up old silicone can look like a fix, but new silicone won’t bond to old, and the leak usually returns. Cutting out and resealing properly lasts. 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.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- Approved under the ARBOMaster scheme
- We leave the area clean and tidy
- Over 20 years’ experience
- Every job guaranteed for a year
Take a look at what affects the cost or our reviews.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What we are called out for in Barnet
Using a sealant not made for glass causes many failures. Some products do not bond well to glass, and acetoxy types can attack some frame materials.
Most people get in touch after spotting one of these:
- Failed joints on frameless glass
- Leaks where conservatory glass meets the frame
- Glazing silicone that has cracked or come away
- Leaking glazing joints on a rooflight
For site and facilities teams at buildings such as Grasvenor Avenue Infant School, the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- Which sealant they’ll use, and why
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
- How long to leave it before use
FAQs for Barnet
I let a flat near New Barnet station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Do you cover Barnet for glazing silicone?
Yes. Our work covers London and the South East, and Barnet is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or send us an email.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
What guarantee do I get?
Our 12-month guarantee covers every job, glazing sealant included.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Are you fully insured?
Yes. Mr Mastic is fully insured.
Can you replace a misted double-glazed unit?
Glass replacement is not our trade. We reseal the joints around it and can tell you if a unit seems to have gone.
Places near Barnet
More services for Barnet
What we do, step by step
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for most jobs. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First, we trace the leak and check it’s coming through a sealant joint.
- Old silicone is cut away from the glass and frame without scratching either.
- Surfaces are cleaned with a solvent suited to glass and the frame.
- We apply a neutral-cure glazing silicone and tool it smooth.
- We check the joints and, where safe, run water over them.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
Get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll come back to you with a quote.