Greater London · England
Glazing & conservatory sealant in Fortis Green, Greater London
Glazing silicone for conservatories, rooflights, glass panels and shower screens for homes and businesses in Fortis Green and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mouldy sealant around glass panels
- Glazing silicone that has cracked or come away
- Leaking glazing joints on a rooflight
Glazing silicone in Fortis Green, done properly
Glazing silicone that has yellowed, blackened or come away spoils the look and lets water in. It comes off cleanly, without marking the glass before the new bead goes in. We work on rooflights, glass balustrade bases and conservatory frames, and common reasons people get in touch are failed joints on frameless glass and a quick top-up bead that didn’t last.
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 Fortis Green.
All our work is covered by our 12-month guarantee, wherever you are in Greater London.
- Location
- Fortis Green (N10, N2, N6)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work can’t fix
Before booking, it’s worth knowing the limits:
- Water coming through the roof rather than a sealant joint
- A roof that has moved or dropped
- A frame that needs repairing or replacing
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Where we work in Fortis Green
- Conservatory frames
- Glass balustrade bases
- Glass-to-frame joints
- Glass-to-glass joints
- Shower screens
- Rooflights
How the job changes by surface
Glass-to-frame joints
Silicone at the glass edge seals it into the frame. A failed bead lets water in.
Glass balustrade bases
We reseal the joint where the glass meets the base channel. We don’t install or replace glass.
What happens if it’s left?
Leaks get worse, not better. Water can damage frames, walls, flooring and furniture, so it pays to deal with it early. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Fortis Green.
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Why choose Mr Mastic in Fortis Green
- Tidy, careful work
- White, clear, grey or coloured to suit, where the product allows
- ARBOMaster approved applicator
- Colour agreed with you before we start
Read how sealant jobs are priced and customer reviews.
Towns and villages near Fortis Green
Also in Fortis Green
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Avoid scraping close to the bead
- Don’t leave a drip for the next storm
- Keep harsh solvents off the silicone
- Run a squeegee over the glass when you’re done
Avoid scraping near the new silicone when cleaning the glass. A soft cloth or sponge is best.
Shower screen leaks can go unnoticed. It can damage the floor or the ceiling below before you spot it.
Do you need glazing silicone in Fortis Green?
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.
If you can see any of these, it’s time to have the joints looked at:
- Water running down inside the glass
- Mouldy sealant around glass panels
- Cracked silicone between glass panels
- Silicone pulling away from the glass
Fortis Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Comparing quotes
- What happens if the job turns out different
- Whether you can choose the colour
- How long the guarantee is
- Who does the work, and how experienced they are
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
The process
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. It usually takes a few hours for most jobs. For a job in Fortis Green, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We trace the leak and confirm it’s a sealant joint.
- We remove the old sealant carefully.
- We clean the glass and frame so the new silicone bonds.
- A neutral-cure glazing silicone is applied and tooled.
- We check the finished joints and test with water where it’s safe.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or email us.
Read more
Your questions about glazing silicone in Fortis Green
Do you work for landlords with property near Alexandra Palace station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Is Fortis Green in your area for glazing silicone?
Yes. Our work covers London and the South East, and Fortis Green is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear price.
Where are you based?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
How much does glazing silicone cost in Fortis Green?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or email us with a short description of the job.
When is the sealant fully cured?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Glazing silicone in Fortis Green: local notes
Historic houses like Heath Hall (about 1.4 miles south-west) are a reminder that the area around Fortis Green has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
If you let a flat or house near Alexandra Palace station, glazing joints are worth checking at the end of a tenancy, before a small leak grows. If you look after a building such as Fortismere School, larger buildings have plenty of frames, and the mastic around each one ages.
Fortis Green is about 1 mile south-east of Finchley, in Greater London. For glazing silicone in and around Fortis Green, please phone 0345 464 0079 or send us an email for a quick quote. We cover Greater London from our Crawley base, Fortis Green included. Across Greater London, we cover 764 places, Fortis Green among them. Our London page covers work nearby.
All of N10, N2 and N6 is within our area for glazing silicone. Local streets include Hill Road, Durham Road and Steeds Road, all of which we cover. Main roads around Fortis Green include the A504. Nearby, we also carry out glazing silicone in Muswell Hill (1 mile east), East Finchley (1 mile west), Highgate (1 mile south), Crouch End (1 mile south-east) and Hampstead Garden Suburb (2 miles south-west). Larger places within reach include London (7 miles south), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (7 miles south), St Pancras (5 miles south) and Shoreditch (6 miles south-east).
Near you in Fortis Green
Typical jobs here are in homes near Tollington School, Cherry Tree Wood and The Clissold Arms and the streets around them. The nearest railway station is Alexandra Palace station, roughly 1.4 miles east. Well-known places in the area include Kenwood House (1.6 miles south-west) and Grand Arcade (1.8 miles north-west). The countryside around Fortis Green includes Highgate Hill and Glebelands Local Nature Reserve.