Greater London · England
Bexley Window Mastic
Mastic around window and door frames, sills and patio doors for Bexley, backed by a one-year guarantee. Call for a quick quote.
- Old mastic that has gone black or come away
- Cracked internal joints between frame and plaster
- Gaps where the sill meets the wall
Aftercare tips
To keep the joints looking good and working properly:
- Don’t paint over the silicone
- Walk round the house once a year and look at the joints
- Repaint timber before it’s bare
- Wash the frames with mild soapy water
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and a cold room gets colder. A new joint closes it up.
Window mastic for homes and businesses in Bexley
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. If you’re dealing with a bead that doesn’t match the frame and rushed sealant from a window installation, we can help, whatever the surface.
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.
You’re covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or drop us an email.
- Where
- Bexley (DA5, DA6, DA14, DA1)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and tidy away. It normally takes a few hours for a handful of frames, longer for a whole house. In Bexley, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- Clear items away from the joints we are working on
- Mention any sign-in or site rules at work premises
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
For a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear price before any work starts.
Advice
Do you need window mastic in Bexley?
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. That is what backing rod is for.
It’s worth asking for a quote if you see:
- Mastic that has split away from the wall
- Mastic that’s falling out in pieces
- Gaps left after new windows were fitted
- Water coming in at the bottom corners of a door
For site and facilities teams at buildings such as Old Bexley Church of England School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- Are they insured?
- The length of the guarantee
- What happens if the job turns out different
- What product goes in the joint
Windows and doors in Bexley
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Red House (about 0.9 miles north) nearby, there’s older building stock in the area around Bexley as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For an older house near a landmark such as Parish Church of St John the Evangelist, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Bexley can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Bexley is about 3 miles east of Eltham, in Greater London. Jobs in Bexley get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 764 towns and villages across Greater London, large and small. There’s also a page for London, roughly 11 miles from Bexley.
Postcode districts we cover here for window mastic: DA5, DA6, DA14 and DA1. If you need window mastic at a property on Bexley High Street, Camden Road and The North Glade or anywhere close by, we can help. You’ll find Bexley on the A2018 and B2210, which makes it straightforward to reach with everything needed for window mastic. Neighbouring places we cover for window mastic include Blendon (1 mile north-west), North Cray (1 mile south), Bexleyheath (1 mile north), Upton (1 mile north) and Coldblow (1 mile east). We also work in nearby towns such as London (11 miles west), City of Westminster (13 miles west), Marylebone (13 miles north-west), Kensington (15 miles west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).
Local landmarks in Bexley
In Bexley, that means homes and buildings near St Columba's Catholic Boys' School, Danson Park and Townley Grammar School. The nearest railway station is Bexley station, about 0.6 miles east of the centre. Nearby you will also find Broadway Shopping Centre (1 mile north-east) and Bexley Museum (1.1 miles east). The countryside around Bexley includes Summer Hill and Wansunt Pit.
Nearby places to Bexley
Other services in Bexley
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 give you a quote.
For anyone letting property in or around Bexley, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Why deal with it now?
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In a flat in Bexley, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost depends on the amount of work, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Why us?
- We agree the colour with you first
- We leave the area clean and tidy
- Sealant colour chosen to suit
- 12-month guarantee on every job
See our cost guide and our reviews.
Surface by surface
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. We seal those with a sealant suited to masonry.
Your questions about window mastic in Bexley
Can you help a landlord with a rental near Bexley station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Is parking a problem for a job in Bexley?
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.
Is there any odour?
Possibly a little. It fades as the sealant cures, and ventilation helps.
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.
Can you get sealant to suit coloured frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Are you insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
How much does window mastic cost in Bexley?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Quotes for window mastic in Bexley
There’s no set price list, because no two jobs are the same. The quote depends on:
- The amount of work
- Mould in or behind the old joints
- The number of rooms or windows
- The product the joint needs
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
Before you ask for a quote, have a think about:
- What’s wrong with the joints now
- How we’d reach the joints
- Roughly how big the job is
- Any previous sealing or DIY work
Every job is quoted individually. Just ring 0345 464 0079 or drop us an email with the details, and photos are welcome.