Greater London · England
Eltham Glazing Silicone
Problem with your glazing joints in Eltham? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Rooflight joints letting water in
- Cracked silicone between glass panels
- Stained, discoloured glazing silicone
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
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.
Glazing silicone in Eltham, done properly
We renew glazing silicone on conservatories, rooflights and glass panels, as well as frameless shower screens and glass balustrade bases. Each joint is cut out, cleaned and resealed. We work on shower screens, glass-to-frame joints and conservatory frames, and common reasons people get in touch are failed joints on frameless glass and water escaping where a screen meets the wall.
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, letting in draughts and water.
All our work is covered by our one-year guarantee, wherever you are in Greater London.
- Location
- Eltham (SE9, SE12, DA15, BR7)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Your questions about glazing silicone in Eltham
Is parking an issue for glazing silicone in Eltham?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Can you help a landlord with a rental near Mottingham station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Do you seal glass balustrade bases?
Yes. The old sealant is removed and the joint resealed with a suitable product.
Why not top up the existing silicone?
A top-up rarely holds. The new bead cannot grip the old one, so we remove the old sealant and clean the joint.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Do you replace glass?
Glass replacement is not our trade. We reseal the joints around it, and we’ll tell you if a unit looks like it has failed.
How much does glazing silicone cost in Eltham?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or drop us an email and let us know what needs doing and where.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
What we can’t put right
We will always be straight with you, so here’s what new sealant won’t do:
- Water coming through the roof rather than a sealant joint
- A roof that has moved or dropped
- A frame that needs repairing or replacing
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Shower screens
- Glass-to-glass joints
- Conservatory frames
- Glass-to-frame joints
- Rooflights
- Glass balustrade bases
Landlord and commercial work in Eltham
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
We also work for property managers and facilities teams. Several sites can go on one quote, and we are fully insured.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Act on drips or damp patches early
- Squeegee the shower screen after each use
- Clear the conservatory gutters regularly
- Avoid scraping close to the bead
Don’t use blades or scrapers near the bead when cleaning the glass. A soft cloth or sponge is best.
Act on black or lifting silicone early. Peeling silicone lets water in behind and the problem grows.
What else we do in Eltham
What happens if it’s left?
A quick bead over the old sealant might stop a drip for a while, but silicone doesn’t stick to silicone and water soon finds its way back. A proper reseal is the lasting answer. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Eltham, the repair is bigger than a sealant job.
No two jobs are quite the same, so we quote each one individually. 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 Eltham
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
- Anti-fungal silicone where joints get wet
- Homes, businesses and hotels
Windows and doors in Eltham
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Eltham is in London, so parking needs planning: let us know about parking bays, permits or a driveway. 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. In the older streets around Church of Holy Trinity, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Eltham is about 7 miles west of Dartford, in Greater London. Every kind of property in Eltham can book us for glazing silicone. The work is guaranteed for a year. Across Greater London, we cover 764 places, and Eltham is one of them. You can also see our page for London, roughly 8 miles from Eltham.
Work in SE9, SE12, DA15 and BR7 is quoted and booked the same way as anywhere else. We cover properties on Eltham High Street, Tarnwood Park and Elmslie Court and the roads around them. You’ll find Eltham on the A20 and B263, so it’s easy for us to get to. We also cover Middle Park (1 mile west), New Eltham (1 mile south-east), Well Hall (1 mile north), Coldharbour (1 mile south) and Avery Hill (1 mile north-east). Larger places within reach include London (8 miles north-west), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (12 miles west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Near you in Eltham
Typical jobs here are in homes near Horn Park, Eltham Church of England Primary School and The Greyhound Public House and the streets around them. Eltham has its own railway station: Mottingham station. Other landmarks nearby include Eltham Community Hospital (less than half a mile north) and Metropolitan Police Museum (2.1 miles east). The countryside around Eltham includes The Tarn and Summer Hill.
What affects the cost of glazing silicone
We quote each job individually. This is what makes a difference:
- Whether the work is at height
- How many areas need sealing
- The number and length of the joints
- Whether old sealant or filler has to be cut out
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- Whether it has been sealed before
- The address or postcode of the job
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
What happens on the day
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from an hour or two to most of a day, depending on the size of the job. 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.
- First, we check where the water gets in.
- The failed silicone is cut out without marking the glass or frame.
- The joint is cleaned and degreased.
- A neutral-cure glazing silicone is applied and tooled.
- Each joint is checked and, where possible, water-tested.
Preparing for the visit
- Mention any parking rules near the property
- Tell us about any water getting in
- Move anything stored near the joints
Getting a quote
Want a quote for glazing silicone? Please call 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.