Greater London · England
Window & door mastic in Charlton, Greater London
Mastic around window and door frames, sills and patio doors for Charlton, backed by a one-year guarantee. Ask us for a quote.
- Whistling draughts around closed windows
- Untidy mastic left by window fitters
- Cracked or shrunken mastic around the frame
Window mastic for homes and businesses in Charlton
Homes in Charlton have every kind of window: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on patio & French doors, uPVC windows and composite doors, and common reasons people get in touch are draughts coming in around windows and doors and hard, cracked sealant around windows.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
You get a one-year guarantee, the same in Charlton as everywhere else we work.
- Place
- Charlton (SE7, SE18)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Nearby places to Charlton
More services for Charlton
Charlton questions
Can you help a landlord with a rental near Charlton station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Can you do window mastic in Charlton?
Yes. We work across London and the South East, and Charlton is part of that. You can call 0345 464 0079 or email us and let us know what needs doing.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can new window sealant be painted?
Not normally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Can resealing stop a draught around my window?
Often, yes. Air often gets in between the frame and the wall, and resealing inside and out closes it.
Do the sealants smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or send us an email.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Why deal with it now?
A quick bead over the top of old mastic looks like an easy fix, but new sealant can’t bond to old, crumbling mastic. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Charlton, the repair is bigger than the sealant job would have been.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Trusted Arbo and Everbuild sealants
- White, clear, grey or coloured to suit, where the product allows
- Homes, businesses and hotels
- 180+ five-star Google reviews
See our cost guide or what customers say.
What the job involves on each surface
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. The threshold and the bottom corners take the most water, so we pay close attention there.
What we’re called out for in Charlton
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and timber moves with moisture as well as temperature.
It’s worth asking for a quote if you see:
- Untidy mastic left by window fitters
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Whistling draughts around closed windows
Homes close to St Catherine Labouré include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before booking anyone
- Whether the sealant suits the joint
- What the cure time is
- Are they insured?
- What happens if they find a problem under the old sealant
What we do, step by step
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. Expect the work to take a few hours for a few frames, or a day or more for a whole house. For a job in Charlton, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
How to prepare
- On commercial sites, let us know about site rules
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Read more
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Damp problems in the wall away from the window
- Worn gaskets, brush seals or a door that has dropped
- Soft or decayed wood in the frame
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before you book.
Surfaces we seal
- Aluminium frames
- Patio & French doors
- uPVC windows
- Window sills
- Composite doors
- Timber windows & doors
Charlton homes and the weather
With historic houses such as Queen's House (about 1.9 miles west) nearby, there’s older building stock in the area around Charlton as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Thorntree Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages. As a London address, Charlton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Charlton is about 2 miles west of Plumstead, in Greater London. Every kind of property in Charlton is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Across Greater London, we cover 764 places, and Charlton is one of them. There’s also a page for London, about 6 miles away.
We cover every part of SE7 and SE18 for window mastic. Window mastic is available to properties on Floyd Road, Guild Road and Priolo Road. Close by, we work in New Charlton (1 mile north-west), Westcombe Park (1 mile west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Kidbrooke (2 miles south). Within a short drive, we also cover London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (6 miles north-west).
What’s near Charlton
We work in homes and buildings around Charlton Park, Wildwood Montessori School and Royal Greenwich Trust School. There’s a railway station in Charlton itself: Charlton station. A little further out are British Hospital for Mothers and Babies (0.5 miles east) and Gallions Reach Shopping Park (2.3 miles north-east). Green spaces nearby include Gilbert's Pit.
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Use gentle cleaners on frames and sealant
- Make sure the drainage slots are not blocked
- Ventilate rooms so frames don’t stay wet inside
- Walk round the house once a year and look at the joints
Most silicone sealants will not take paint, so mention any painting plans before any work starts. We can use a paintable sealant where that matters.
Leaks generally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.