Greater London · England
Glazing Silicone in Lewisham
Glazing silicone for conservatories, rooflights, glass panels and shower screens for homes and businesses in Lewisham and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Stained, discoloured glazing silicone
- New silicone smeared over old sealant
- Split or lifting silicone on glass
The process
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before work begins. Most jobs take 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.
- 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.
- Each joint is checked and, where possible, water-tested.
Before we arrive
- Clear the area around the work
- Mention any sign-in or site rules at work premises
- Let us know about earlier repairs to the joints
Getting a quote
To get a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Related advice
How we handle glazing silicone in Lewisham
Glass replacement is not something we do, and misting between panes means a failed sealed unit. What we do is the silicone around the glass, which is where many leaks start. If you have water running down inside the glass and water escaping where a screen meets the wall, we can help, whatever the surface.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
Big or small, it’s backed by our one-year guarantee.
- Where
- Lewisham (SE13, SE8, SE6)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
So the new joints stay in good condition:
- Avoid strong solvents on or near the sealant
- Keep scrapers and blades away from the silicone
- Inspect the sealant on glazing annually
- Run a squeegee over the glass when you’re done
Use mild cleaners on and around the silicone. Harsh solvents may damage the bead.
If silicone on glass has cracked, water is already getting in. Renewing it early keeps it simple compared with fixing water damage later.
What we are called out for in Lewisham
Sunlight breaks sealant down, especially on conservatory roofs. Old silicone hardens, cracks and loses its grip to the glass and frame.
Most people get in touch after spotting something like this:
- Shower screens leaking along the wall or tray
- Water getting into a conservatory at the joints
- Black or yellowed silicone on glass joints
- Drips on the inside of a conservatory window
Lewisham is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Comparing quotes
- How the surfaces are prepared before sealing
- What guarantee comes with the work
- When the joint can take water or movement
- Whether the sealant suits the joint
Also near Lewisham
Other services in Lewisham
Leave it or put it right?
Glazing joints need a sealant made for the job. General-purpose sealant from a DIY shop may not suit glass or the frame so we choose a glazing silicone instead. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Lewisham, the repair is bigger than a sealant job.
The cost depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Lewisham
- We leave the area clean and tidy
- Full insurance on every job
- We never seal over old sealant
- Homes, businesses and hotels
See what affects the cost and what customers say.
Work for landlords, hotels and businesses
We work for letting agents and landlords as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Frames and glazing around Lewisham
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Managing a site like St Saviour's Catholic Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Lewisham station? Then glazing joints are worth checking at the end of a tenancy, before a small leak grows.
Lewisham is about 3 miles west of Eltham, in Greater London. Whether you’re in the middle of Lewisham or further out, we cover glazing silicone for every kind of property. Our area takes in 764 places across Greater London, from the larger towns to small villages.
All of SE13, SE8 and SE6 is covered for glazing silicone, from the main roads to the quietest streets. You will find streets such as Station Road, Lewisham High Street and Lewis Grove. Being close to the B220, Lewisham is simple for us to get to. Nearby, we also carry out glazing silicone in Ladywell (1 mile south-west), St Johns (1 mile north-west), Hither Green (1 mile south-east), Blackheath (1 mile north-east) and Lee (1 mile south-east). Larger places within reach include London (4 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (9 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
Local landmarks in Lewisham
Locally, jobs take us to homes and businesses close to St Joseph's Academy, Ladywell Fields and The Watch House and the streets around them. There’s a railway station in Lewisham itself: Lewisham station. Well-known places in the area include Greenwich Castle (1.2 miles north) and Fan Museum (1.2 miles north). Open spaces near Lewisham include Knight's Hill and Brookmill Road Local Nature Reserve.
FAQs for Lewisham
Can parking be tricky for a visit in Lewisham?
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 work for landlords with property near Lewisham station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Can you reseal a frameless shower screen?
Yes. We remove the old sealant and reseal the wall and tray joints.
Is it worth trying it myself?
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.
How long does glazing silicone take?
As a guide, most jobs take a few hours for most jobs. Bigger jobs take longer, and we will tell you how long to expect.
How much does glazing silicone cost in Lewisham?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we have agreed the job, you don’t need to watch us work.
Do you cover Lewisham?
Yes. We work in Lewisham and the rest of Greater London. To book, phone 0345 464 0079 or send us an email.
What sealant work cannot fix
In fairness, some problems need a different trade:
- A sagging or failing conservatory roof
- A frame that needs repairing or replacing
- A broken pane or roof panel
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Glass balustrade bases
- Glass-to-glass joints
- Conservatory frames
- Rooflights
- Glass-to-frame joints
- Shower screens
Surface by surface
Glass balustrade bases
Glass balustrades sit in a channel that is often finished with sealant. Failed sealant there lets water collect.
Rooflights
Rooflight leaks can come from the sealant or the roof. We check which it is.