Greater London · England
St Johns Glazing Silicone
Specialist glazing silicone for St Johns: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Rooflight joints letting water in
- Split or lifting silicone on glass
- Cracked silicone between glass panels
About our glazing silicone in St Johns
We work across St Johns on glazing joints for homes and businesses. From conservatories to shower screens, it’s the same careful method. We work on shower screens, rooflights and conservatory frames, and people most often call us about cracked silicone between glass panels and split or lifting silicone on glass.
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, which is when draughts and damp patches appear in homes in St Johns.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- St Johns (SE13, SE10, SE8)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in St Johns
UV light ages silicone, especially on conservatory roofs. It goes brittle, cracks and stops sticking to the glass and frame.
Look out for any of the following:
- Water running down inside the glass
- Failed joints on frameless glass
- New silicone smeared over old sealant
- Leaks from the base of a shower screen
St Johns is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Questions to ask before booking
- What guarantee comes with the work
- What happens if the job turns out different
- Whether you can choose the colour
- What the quote includes, VAT included or not
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Wipe the screen down after showering
- Keep harsh solvents off the silicone
- Keep conservatory gutters clear of leaves
- Check the silicone on glass every year or so
Check the joints once a year. Catching a split early keeps the repair small, before water gets in.
A small conservatory leak soon spreads. Water runs along frames and down walls so it’s best dealt with straight away.
More services for St Johns
Honest limits
New sealant can’t fix everything, and we’ll tell you before we start. Sealant will not put right:
- Cracked or broken glass
- Leaks from the roof covering or flashing (a roofer’s job)
- Condensation trapped between two panes
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Glass balustrade bases
- Glass-to-frame joints
- Glass-to-glass joints
- Conservatory frames
- Rooflights
- Shower screens
St Johns questions
Do you cover St Johns for glazing silicone?
Yes, St Johns is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Is parking an issue for glazing silicone in St Johns?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
Can I choose the sealant colour?
Yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.
I rent my home. Can I book you?
We are happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
What affects the quote in St Johns
Your quote is based on your job. We look at:
- Whether there’s mould to deal with
- The product the joint needs
- Working hours on commercial sites
- How many areas need sealing
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
What to tell us when you ask for a quote:
- Roughly how big the job is
- The problem you’ve noticed
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
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 quote.
We work for landlords and agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
How it works
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours, depending on how many joints need doing. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in St Johns. A visitor permit or a nearby bay makes the visit run more smoothly.
- We trace the leak and confirm it’s a sealant joint.
- The failed silicone is cut out without marking the glass or frame.
- 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.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
- Let us know about earlier repairs to the joints
Ask for a quote
There’s no standard price list. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or send us an email.
Related advice
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Glazing silicone in St Johns: local notes
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Historic houses like Queen's House (about 1.1 miles north-east) are a reminder that the area around St Johns 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 St Johns station? Then leaking glazing joints, shower screens or conservatory seals are worth sorting between tenancies. If you look after a building such as Ashmead Primary School, the mastic around its windows and doors needs looking after like any other building’s.
St Johns is about 4 miles south-east of London, in Greater London. We carry out glazing silicone for householders, landlords and businesses in St Johns, as part of our work across Greater London. Our Greater London coverage runs to 764 places, St Johns among them.
Postcode districts we cover here for glazing silicone: SE13, SE10 and SE8. That includes homes and businesses on Avon Road, Mill Lane and Clare Road and the roads around them. You’ll find St Johns on the A2210 and A2211, which makes it straightforward to reach with everything needed for glazing silicone. If you are just outside St Johns, we cover New Cross (1 mile west), Deptford (1 mile north), Lewisham (1 mile south-east), Telegraph Hill (1 mile west) and Ladywell (1 mile south). We also work in nearby towns such as London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (8 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
Around St Johns
Locally, jobs take us to homes and businesses close to Wickham Arms, Brookmill Park and Addey and Stanhope School. You’ll also find St. Paul's (0.7 miles north) and Laban Centre (0.8 miles north). St Johns has its own railway station: St Johns station. A little further out are Fan Museum (0.9 miles north-east) and Lewisham Shopping Centre (0.7 miles south-east). Green spaces nearby include Brookmill Road Local Nature Reserve and Tower Hill.