Greater London · England
London Glazing Silicone
Glazing silicone across London and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Water running down inside the glass
- Leaks where conservatory glass meets the frame
- Leaking glazing joints on a rooflight
What sealant work can’t fix
New sealant cannot fix everything, and we’ll tell you before we start. Sealant won’t put right:
- Leaks from the roof covering or flashing (a roofer’s job)
- A roof that has moved or dropped
- Misting between the panes of a double-glazed unit (a failed unit for a glazier)
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
What we seal
- Glass-to-frame joints
- Glass balustrade bases
- Glass-to-glass joints
- Conservatory frames
- Rooflights
- Shower screens
About our glazing silicone in London
Sealant on glazing doesn’t last for ever. Sun, rain and movement wear it down and cracked joints let water in. Resealing puts that right. If you’re dealing with leaking glazing joints on a rooflight and failed joints on frameless glass, we can put it right, on shower screens, glass balustrade bases and glass-to-frame joints alike.
Town-centre flats, shops and offices in London have long runs of frames and glazing, often on upper floors. Failed joints up there let in water that can go unnoticed for a while.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Location
- London (CR0, E14, CR4, SW11)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
More services for London
What glazing silicone looks like in London
With historic houses such as Mansion House (about 1 mile north) nearby, there’s older building stock in the area around London as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Elephant & Castle station change hands often, and leaking glazing joints, shower screens or conservatory seals are worth sorting between tenancies. In the older streets around St George the Martyr, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
London is in Greater London. Anywhere in CR0, we cover glazing silicone for homes and businesses. Our Greater London coverage runs to 764 places, London among them.
Here we cover the CR0, E14, CR4 and SW11 postcode area for glazing silicone. You will find streets such as Walcot Square, Surrey Square and Sutherland Square. Being close to the A2 and A10, London is easy for our applicators to reach for glazing silicone. Other places close to London include Walworth (1 mile south), Bermondsey (1 mile east), Camberwell (2 miles south), South Bermondsey (2 miles south-east) and Surrey Canal (2 miles south-east). We also work in nearby towns such as City of Westminster (3 miles west), Marylebone (3 miles north-west), Kensington (5 miles west), Walthamstow (7 miles north-east), Hampstead (5 miles north-west) and Ruislip (14 miles west). As one of the bigger places in Greater London, London has every kind of property, from flats to offices.
Near you in London
Typical jobs here are in homes near Newington Gardens, Trinity Arms Public House and London School of Musical Theatre. Other local landmarks include St Mary-at-Hill (0.9 miles north-east), Ark Globe Academy (less than half a mile south) and The BFI Reuben Library (1 mile north-west). London has its own railway station: Elephant & Castle station. Nearby you will also find Surrey Dispensary (less than half a mile south-east) and Baynard's Castle (0.9 miles north). Open spaces near London include Bellenden Road Nature Garden and St. James's Park Lake.
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Clear the conservatory gutters regularly
- Avoid scraping close to the bead
- Keep air moving in the conservatory
- Wipe the screen down after showering
Follow the cure time we give you before the joints get wet so the silicone can set properly. After that, clean glass with a mild cleaner.
If silicone on glass has cracked, water is already getting in. Renewing it early keeps it simple compared with fixing water damage later.
How it works
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 anything from an hour or two to most of a day, depending on the size of the job from start to finish. Jobs in a place the size of London range from town-centre flats to offices and family homes. For each, it helps to know about access, parking and where the joints are.
- We look at the glazing and agree which joints need resealing.
- We cut away the failed silicone.
- We clean and prepare the joint.
- New glazing silicone goes in and is finished neatly.
- We inspect the work and test it where we can.
Getting ready for the visit
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
- Tell us about any water getting in
How to get a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Related advice
Why deal with it now?
If the problem is a misted unit or a broken panel, sealant will not help. We will tell you that rather than seal it anyway and point you to a glazier or roofer. Busy buildings in London, from hotels to offices, can’t afford rooms out of use for leaks or mould, so failing joints are best replaced on a planned basis.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why choose Mr Mastic in London
- Old sealant always removed completely
- Neat joints and a tidy finish
- Every job guaranteed for a year
- 180+ five-star Google reviews
Take a look at what affects the cost or our reviews.
Common questions in London
What guarantee comes with glazing silicone in London?
All our work, in London and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
I let a flat near Elephant & Castle station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Will there be a smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Can you reseal the base of a glass balustrade?
Yes. We cut out the failed sealant and reseal the base joint with a suitable product.
Can you just put new silicone over the old?
Many leaks we see come from exactly that. We remove the old silicone, clean the joint and reseal.
How much does glazing silicone cost in London?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we’ll talk you through it.
Will resealing stop my conservatory leaking?
It depends on the cause. Sealant joints we can renew, but roof panels and structural problems need a conservatory specialist or roofer.
Where are you based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Quotes for glazing silicone in London
Some jobs are bigger than they look, and some smaller. The main factors:
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- The type of sealant required
- Access and height
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The type of property
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- Roughly how big the job is
Want a quote for glazing silicone? Please call 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Landlords, agents and businesses in London
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
What we’re called out for in London
The wrong sealant is a common cause. Some products do not bond well to glass, and acetoxy types can attack some frame materials.
Common reasons people contact us are:
- Water escaping where a screen meets the wall
- Rooflight joints letting water in
- Split or lifting silicone on glass
- Conservatory leaks at frame and glazing joints
If you look after a building such as Charles Dickens Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- What happens if the job turns out different
- Are they insured?
- Whether the sealant suits the joint
- What preparation is included