Greater London · England
Glazing & conservatory sealant in Highgate, Greater London
Professional glazing silicone in and around Highgate, with old sealant always removed completely.
- A quick top-up bead that didn’t last
- Leaks from the base of a shower screen
- Split or lifting silicone on glass
How we handle glazing silicone in Highgate
A frameless shower screen depends on its silicone. Leaks usually come from the wall joint or the tray joint, and we reseal both. We’re often asked to deal with cracked silicone between glass panels and mouldy sealant around glass panels, across glass-to-glass joints, glass balustrade bases and conservatory frames.
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, letting in draughts and water.
Big or small, it’s backed by our one-year guarantee in Highgate and across Greater London.
- Place
- Highgate (N6, N19, NW5)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens if it’s left?
Replacing a conservatory roof is major work. If the leak is a failed sealant joint, resealing is far simpler. If it’s the roof itself, we will tell you. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Highgate.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
Why choose Mr Mastic in Highgate
- Fully insured
- ARBOMaster approved applicator
- White, clear, grey or another colour, product permitting
- A 12-month guarantee on all work
Nearby places to Highgate
Other services in Highgate
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll give you a quote.
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
What we cannot put right
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- A frame that needs repairing or replacing
- Glass that needs replacing
- Structural problems with a conservatory roof
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Shower screens
- Glass-to-glass joints
- Conservatory frames
- Glass-to-frame joints
- Rooflights
- Glass balustrade bases
Highgate: your questions answered
Can you do glazing silicone in Highgate?
Yes, Highgate is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Can parking be tricky for a visit in Highgate?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you fit new glass or sealed units?
That is not something we do. Misting between panes means the sealed unit has failed, and a glazier needs to replace it.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Is the work guaranteed?
There’s a 12-month guarantee on every job.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you will get one quote.
Will the old sealant be removed?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
DIY sealant or a professional job?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
What glazing silicone looks like in Highgate
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Witanhurst (about 0.4 miles south-west) nearby, there’s older building stock in the area around Highgate as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Highgate is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Rented homes near Upper Holloway station change hands often, and leaking glazing joints, shower screens or conservatory seals are worth sorting between tenancies.
Highgate is about 2 miles north-east of Hampstead, in Greater London. From the centre of Highgate to the outskirts, glazing silicone is available for homes and businesses alike. Highgate is one of 764 towns and villages in Greater London we cover.
Jobs for glazing silicone in N6, N19 and NW5 works the same way as everywhere else we cover. If you need glazing silicone at a property on Wood Lane, Grange Road and Talbot Road or a nearby road, we can help. We also cover Upper Holloway (1 mile south-east), Dartmouth Park (1 mile south), Lissenden Gardens (1 mile south), Crouch End (1 mile north-east) and Tufnell Park (1 mile south-east). Larger places within reach include London (5 miles south-east), City of Westminster (4 miles south), Marylebone (4 miles south), Kensington (6 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south-east).
Landmarks near Highgate
In Highgate, that means homes and buildings near The Angel Inn, St Aloysius RC College and Whittington Park. For rail, the closest station is Upper Holloway station, roughly 0.9 miles south-east of the centre. A little further out are Highgate Private Hospital (0.6 miles north-west) and Montfichet's Tower (4.4 miles south-east). Green spaces nearby include Darland's Lake and Parkland Walk.
What happens on the day
There is not much for you to do on the day. Show us the job and we will take it from there. The job generally takes a few hours for most jobs from start to finish. In Highgate, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we trace the leak and check it’s coming through a sealant joint.
- We cut out the failed silicone, taking care of the glass and frame.
- Surfaces are cleaned with a solvent suited to glass and the frame.
- Glazing silicone suited to the joint is applied and tooled.
- We check the joints and, where safe, run water over them.
Preparing for the visit
- Clear items away from the joints we are working on
- Tell us about access, such as stairs, a lift or high-level joints
- Keep pets and children clear of the area while we work
How to get a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Related advice
What affects the quote in Highgate
There’s no set price list, because jobs vary so much. The quote depends on:
- Working hours on commercial sites
- The size of the job
- The product the joint needs
- The old material and how stubborn it is
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- Any previous sealing or DIY work
- How we’d reach the joints
- Photos by email, if that is easy
- What the problem is, such as mould, gaps, leaks or cracking
For glazing silicone in Highgate, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
When to call us in Highgate
Not every leak is a sealant problem: broken panels, roof problems and blocked gutters can all let water in. We find the cause before we seal anything.
The most common problems we see are:
- Stained, discoloured glazing silicone
- Glass-to-glass joints that have split
- A quick top-up bead that didn’t last
- Failed sealant around rooflight glass
Schools such as St Michael's Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- What preparation is included
- How hidden problems are handled
- Which colour the sealant will be
- How long the guarantee is