Greater London · England
Glazing & conservatory sealant in Coldharbour, Greater London
Glazing silicone for conservatories, rooflights, glass panels and shower screens for homes and businesses in Coldharbour and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Glass-to-glass joints that have split
- Mouldy sealant around glass panels
- Water running down inside the glass
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How we handle glazing silicone in Coldharbour
Glazing silicone that has yellowed, blackened or come away spoils the look and lets water in. We remove it without scratching the glass or frame before the new bead goes in. If you have black or yellowed silicone on glass joints and rooflight joints letting water in, we can put it right.
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, which is when draughts and damp patches appear in homes in Coldharbour.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Place
- Coldharbour (SE9, BR7)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Frames and glazing around Coldharbour
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. With historic houses such as Eltham Palace (about 1.1 miles north) nearby, there’s older building stock in the area around Coldharbour as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near St Alban, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Mottingham station? Then a shower screen or conservatory joint that leaks is easier to reseal while the property is empty.
Coldharbour is about 4 miles north-west of Orpington, in Greater London. We provide glazing silicone to homeowners, landlords and businesses in Coldharbour and the surrounding area. Coldharbour is one of 764 towns and villages in Greater London we cover. We also work in London, around 8 miles away.
Postcode districts we cover here for glazing silicone: SE9 and BR7. If you need glazing silicone at a property on Green Lane, Horley Road and Dorset Road or anywhere close by, we can help. If you are just outside Coldharbour, we cover Mottingham (1 mile west), Chinbrook (1 mile west), New Eltham (1 mile north-east), Eltham (1 mile north) and Middle Park (1 mile north-west). Further out, we also cover London (8 miles north-west), City of Westminster (11 miles north-west), Marylebone (10 miles north-west), Kensington (12 miles north-west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
What’s near Coldharbour
We work in homes and buildings around Elmstead Wood and St Thomas More Catholic Comprehensive School. Coldharbour’s nearest station is Mottingham station, about 0.6 miles north. Other landmarks nearby include The Glades (2.4 miles south-west) and Metropolitan Police Museum (2.2 miles east). For a walk, there’s The Tarn and Summer Hill.
How we quote for glazing silicone
You’ll get a clear quote before we start. It’s based on:
- When we can work, for business premises
- How many rooms, windows or areas are involved
- The type of sealant required
- The old material and how stubborn it is
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The rough size of the job
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
We do not publish a price list. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or send us an email.
Leave it or put it right?
A leaking joint will not fix itself. Left, water can mark floors, damage plaster and rot timber, so it pays to deal with it early. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first.
Why us?
- Full insurance on every job
- Quality sealants from Arbo and Everbuild
- We never seal over old sealant
- A 12-month guarantee on all work
Take a look at our cost guide and what customers say.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- A sagging or failing conservatory roof
- Failed flashing around a conservatory
- A frame that needs repairing or replacing
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Coldharbour
- Rooflights
- Glass-to-glass joints
- Glass balustrade bases
- Conservatory frames
- Glass-to-frame joints
- Shower screens
Also near Coldharbour
Other services in Coldharbour
When to call us in Coldharbour
The wrong sealant is a common cause. Not every silicone sticks properly to glass and vinegar-smelling acetoxy silicone can attack some metals.
Common reasons people contact us include:
- Water running down inside the glass
- Failed joints on frameless glass
- Rooflight joints letting water in
- Stained, discoloured glazing silicone
As a London address, Coldharbour can be tricky for parking: let us know about parking bays, permits or a driveway.
Questions to ask before booking
- Which colour the sealant will be
- Whether all the old sealant comes out first
- Are they insured?
- What happens if they find a problem under the old sealant
How it works
At the end, we look at the finished work together. The visit itself normally takes a few hours for most jobs, depending on how much there is to do. For a job in Coldharbour, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We look at the glazing and agree which joints need resealing.
- We cut away the failed silicone.
- We clean and prepare the joint.
- We apply and tool the new silicone.
- We inspect the work and test it where we can.
How to prepare
- Clear items away from the joints we’re working on
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
Ask for a quote
We quote each job on its own, so start by telling us what you need. Simply phone 0345 464 0079 or drop us an email and describe the job.
Advice
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Clear the conservatory gutters regularly
- Stick to mild cleaners on glass
- Look over the glazing joints once a year
- Squeegee the shower screen after each use
Keep the new joints dry for as long as we advise. After that, clean glass with a mild cleaner.
Act on black or lifting silicone early. Peeling silicone lets water in behind and the problem grows.
Coldharbour: your questions answered
Do you work for landlords with property near Mottingham station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is parking an issue for glazing silicone in Coldharbour?
Parking in Coldharbour, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you fit new glass or sealed units?
No, our work is the silicone. Glass and sealed units need a glazier.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Do you have insurance?
Yes. We’re fully insured for domestic and commercial work.
Is balustrade sealant something you do?
We can, if the base joint is sealed. Photos help us see what’s there when you ring 0345 464 0079 or email us.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
How long does the job take?
A typical job takes a few hours, depending on how many joints need doing. We’ll confirm how long when we quote.