Greater London · England
Glazing & conservatory sealant in Sydenham, Greater London
Glazing silicone for conservatories, rooflights, glass panels and shower screens in Sydenham, with a one-year guarantee on every job. Ask us for a quote.
- Shower screens leaking along the wall or tray
- Sealant that was laid over old silicone and failed
- Leaking glazing joints on a rooflight
Glazing silicone in Sydenham
We renew glazing silicone on conservatories, rooflights and glass panels plus shower screens and the bases of glass balustrades. The old sealant comes out, the joint is cleaned and new silicone goes in. Common call-outs are for mouldy sealant around glass panels and failed joints on frameless glass, across shower screens, glass-to-frame joints and glass-to-glass joints.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
Big or small, you get the same 12-month guarantee.
- Where
- Sydenham (SE26, SE20, SE23)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work can’t fix
In fairness, there are a few things sealant won’t fix:
- Rotten or badly damaged frames
- Leaks from the roof covering or flashing (a roofer’s job)
- Condensation trapped between two panes
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Where we work in Sydenham
- Rooflights
- Glass-to-glass joints
- Conservatory frames
- Glass balustrade bases
- Shower screens
- Glass-to-frame joints
FAQs for Sydenham
I let a flat near Sydenham station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. You can phone 0345 464 0079 or email us with the details for a clear quote.
Can parking be tricky for a visit in Sydenham?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Which silicone is used for glass joints?
Glass needs a sealant made for glazing. We use neutral-cure glazing silicone and anti-fungal silicone in wet areas.
Can you fix a leaking conservatory?
Yes, when the leak is a failed sealant joint. If the cause is the roof, a panel or a unit, we will say so.
Can you match the sealant colour?
Most of the time, yes. We’ll explain which colours are available and agree one before we start.
The process
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. Most jobs take anything from an hour or two to most of a day, depending on the size of the job. In Sydenham, 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 check where the water gets in.
- 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.
How to prepare
- Let us know about stairs, lifts or work at height
- Keep pets and children clear of the area while we work
- Let us know if you’ve seen damp or leaks
Get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work and send you a clear quote.
Related advice
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Look over the glazing joints once a year
- Get a new leak looked at quickly
- Squeegee the shower screen after each use
- Keep harsh solvents off the silicone
Avoid scraping near the new silicone when you clean. Stick to a soft cloth.
Do not leave lifting or mouldy silicone on glazing. Peeling silicone lets water in behind and the problem grows.
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
What affects the quote in Sydenham
For a quick quote, just ask. The main things that affect it are:
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- Whether the work is at height
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
When you call or email, it’s useful to know:
- Whether it’s a home or a business
- Where the property is
- Any previous sealing or DIY work
- Photos by email, if that’s easy
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
What we’re called out for in Sydenham
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.
Signs it’s time to call us include:
- Silicone pulling away from the glass
- Water tracking down the inner face of the glass
- Water escaping where a screen meets the wall
- Glass-to-glass joints that have split
Homes close to Church of St Bartholomew include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
What to look for in a quote
- When the joint can take water or movement
- Who turns up on the day
- Which colour the sealant will be
- How long the guarantee is
Frames and glazing around Sydenham
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Sydenham is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Schools such as Kirkdale School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Sydenham is about 3 miles south-east of East Dulwich, in Greater London. If you need glazing silicone in Sydenham, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Greater London from our Crawley base. Our Greater London coverage runs to 764 places, and Sydenham is one of them.
Here we cover the SE26, SE20 and SE23 postcode area for glazing silicone. If you need glazing silicone at a property on Byne Road, Lucas Road and Cator Road or anywhere close by, we can help. We also cover Penge (1 mile south), Crystal Palace (1 mile south-west), Sydenham Hill (1 mile north-west), Perry Vale (1 mile north-east) and Anerley (1 mile south-west). Larger places within reach include London (5 miles north), City of Westminster (7 miles north-west), Marylebone (8 miles north-west), Kensington (8 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Landmarks near Sydenham
Around Sydenham, our work takes us to homes and buildings near St Bartholomews's Church of England Primary School, Sydenham High School and Mayow Park. Sydenham has its own railway station: Sydenham station. Well-known places in the area include Greenwich Castle (4.3 miles north-east) and Crystal Palace Museum (1 mile west). Open spaces near Sydenham include Dacres Wood and Knight's Hill.
Nearby places to Sydenham
Also in Sydenham
Leave it or put it right?
Replacing a conservatory roof is major work. If the leak is a failed sealant joint renewing the joint is the simpler fix. If the roof is the problem, we’ll say so. In a flat in Sydenham, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
The cost depends on the amount of work, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Why book with us
- A choice of colours where the product allows
- We never seal over old sealant
- One-year guarantee on every job
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost and what customers say.