Greater London · England
Glazing & conservatory sealant in Hornsey, Greater London
Our applicators work in Hornsey on glazing silicone for conservatories, rooflights, glass panels and shower screens. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Water tracking down the inner face of the glass
- Water escaping where a screen meets the wall
- Leaking glazing joints on a rooflight
Glazing silicone in Hornsey: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Bruce Castle (about 2 miles north-east) are a reminder that the area around Hornsey has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Hornsey station? Then glazing joints are worth checking at the end of a tenancy, before a small leak grows. Managing a site like St Mary's CofE Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Hornsey is about 3 miles east of Finchley, in Greater London. Whether you’re in the middle of Hornsey or further out, we cover glazing silicone for every kind of property. Hornsey is one of 764 towns and villages in Greater London where we work. You can also see our page for London, about 6 miles away.
Every address in N8 and N22 is covered for glazing silicone. You will find streets such as High Street, Brandon Place and Cross Lane, and we cover them all. Neighbouring places we cover for glazing silicone include Turnpike Lane (1 mile east), Crouch End (1 mile south-west), Stroud Green (1 mile south-east), Wood Green (1 mile north-east) and Noel Park (1 mile north-east). Further out, we also cover London (6 miles south), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (7 miles south-west), St Pancras (4 miles south) and Shoreditch (5 miles south).
Near you in Hornsey
We work in homes and buildings around Great Northern Railway pub, Priory Park and Greek Secondary School of London, among other places. Hornsey has its own railway station: Hornsey station. Well-known places in the area include Hornsey Central Hospital (0.7 miles west) and Broomfield House Museum (2 miles north). The countryside around Hornsey includes Darland's Lake and Highgate Hill.
About our glazing silicone in Hornsey
Many conservatory leaks come down to failed sealant at the glass-to-frame or frame-to-wall joints. We trace the leak to the joint and reseal it, and if it’s something sealant cannot fix, we will tell you. We work on shower screens, glass-to-frame joints and glass-to-glass joints, and common reasons people get in touch are water getting into a conservatory at the joints and split or lifting silicone on glass.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Hornsey (N8, N22)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
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.
How we quote for glazing silicone
Your quote is based on your job. We take into account:
- Which sealant suits the joint
- Any working-time requirements on site
- Mould in or behind the old joints
- How many areas need sealing
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email.
Asking for a quote
To help us quote quickly, please include:
- If it’s domestic, commercial or a hotel
- A few photos by email, if you can
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Places near Hornsey
What else we do in Hornsey
Hornsey questions
Is parking an issue for glazing silicone in Hornsey?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near Hornsey station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
How much does glazing silicone cost in Hornsey?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Do you reseal glass shower screens?
Yes, it’s a common job. We use anti-fungal silicone made for wet areas.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or drop us an email.
Can you replace a misted double-glazed unit?
No, our work is the silicone. Glass and sealed units need a glazier.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Can you fix a leaking conservatory?
If the water is coming in through failed sealant joints, yes. If the cause is the roof, a panel or a unit, we will say so.
Signs you need glazing silicone in Hornsey
UV light ages silicone and roof joints get the most sun. Old silicone hardens, cracks and loses its grip to the glass and frame.
The most common problems we see are:
- Glass-to-glass joints that have split
- Water running down inside the glass
- Stained, discoloured glazing silicone
- Water getting into a conservatory at the joints
In the older streets around Church of Holy Innocents, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- Whether they seal over old material or remove it
- Who does the work, and how experienced they are
- The length of the guarantee
- What happens if they find a problem under the old sealant
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- A sagging or failing conservatory roof
- Glass that needs replacing
- A frame that needs repairing or replacing
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Where we work in Hornsey
- Rooflights
- Shower screens
- Glass-to-frame joints
- Conservatory frames
- Glass balustrade bases
- Glass-to-glass joints
What we do, step by step
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours for most jobs. In Hornsey, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by finding the leak and making sure sealant is the cause.
- Old silicone is cut away from the glass and frame without scratching either.
- We clean the joint with a solvent that suits the glass and frame.
- New glazing silicone goes in and is tooled to a neat finish.
- The finished joints are checked and, where it’s safe, tested with water.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we are working on
- Let us know about parking restrictions
Get a quote
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or send us an email with the details, and pictures are welcome.
Advice
Different surfaces, different methods
Conservatory frames
Exposed frame joints wear with the weather. Renewed sealant keeps water out.
Glass balustrade bases
We reseal the joint where the glass meets the base channel. Glass fitting is a separate trade.
Work for landlords, hotels and businesses
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.