Greater London · England
Foxbury Window Mastic
Window mastic for Foxbury and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Draughty joints inside around the window
- Mastic that has split away from the wall
- Black, perished sealant on frames
What happens if it’s left?
Redecorating is a good moment to renew the mastic. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. In a flat in Foxbury, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Why book with us
- A 12-month guarantee on all work
- Domestic, commercial and hotel work
- Neat joints and a tidy finish
- Trusted Arbo and Everbuild sealants
See our cost guide or customer reviews.
How we handle window mastic in Foxbury
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that cannot move properly, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. Common call-outs are for draughty joints inside around the window and mastic that’s falling out in pieces, across uPVC windows, window sills and aluminium frames.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
Your job is guaranteed for a year, as with all our work.
- Where
- Foxbury (DA14, BR7, DA15)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Foxbury
There’s no set price list, because jobs vary so much. The quote depends on:
- Any working-time requirements on site
- The type of sealant required
- Any mould that needs treating
- The size of the job
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Asking for a quote
To make quoting easier, let us know:
- How many joints, rooms or windows are involved
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
- The problem you’ve noticed
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or send us an email.
Foxbury homes and the weather
With historic houses such as Eltham Palace (about 2.6 miles north-west) nearby, there’s older building stock in the area around Foxbury as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
Managing a site like Chislehurst School for Girls? Then the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Christ Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Foxbury is about 1 mile east of Chislehurst, in Greater London. Every kind of property in Foxbury is covered for window mastic, old or new, large or small. Every job comes with our one-year guarantee. Foxbury is one of 764 towns and villages in Greater London we cover for window mastic. London is on our list too, around 10 miles away.
Work in DA14, BR7 and DA15 works the same way as everywhere else we cover. Local streets include Kemnal Road, Sydney Road and Carlton Road, all of which we cover. We also cover Longlands (1 mile north), Chislehurst (1 mile west), New Eltham (1 mile north-west), Elmstead (2 miles west) and Coldharbour (2 miles north-west). Larger places within reach include London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (14 miles north-west), St Pancras (12 miles north-west) and Shoreditch (10 miles north-west).
Around Foxbury
Typical jobs here are in homes near Chislehurst Common, Mead Road Infant School and The Bulls Head Public House. The nearest railway station is Sidcup station, roughly 1.2 miles north-east of the centre. Well-known places in the area include The Glades (3.3 miles west) and Queen Mary's Hospital (0.6 miles east). For a walk, there’s Summer Hill and The Tarn.
DIY versus a professional finish
If you do try it yourself, take your time over the 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.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Your questions about window mastic in Foxbury
Can you do window mastic in Foxbury?
Yes, Foxbury is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Is parking a problem for a job in Foxbury?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or email us.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
What does window mastic cost?
It depends on the job, so we quote each one individually. To get one, ring 0345 464 0079 or email us and let us know what needs doing and where.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
How many windows can you do in a day?
A few frames take a few hours. You will get a timescale with the quote.
Can you match the sealant to my frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Towns and villages near Foxbury
What else we do in Foxbury
How the job changes by surface
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. We cut it out, back any deep gaps and reseal properly.
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain cannot run into the wall.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of frames, longer for a whole house and we leave things clean and tidy. In Foxbury, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
- Mention if the joints have been sealed before
Ask for a quote
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before we start.
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What we’re called out for in Foxbury
Sun, frost and rain wear sealant out. Sunlight dries the surface out, until it loses its stretch and starts to crack.
The most common problems we see are:
- Cold air getting in at the frame edge
- Gaps left after new windows were fitted
- Hard, cracked sealant around windows
- Sealant in the wrong colour for the frame
Rented homes near Sidcup station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
What to look for in a quote
- Whether all the old sealant comes out first
- Whether VAT is included
- How long to leave it before use
- Who turns up on the day
Looking after it afterwards
To keep the joints looking good and working properly:
- Don’t aim a pressure washer at the joints
- Wash the frames with mild soapy water
- Paint up to the joint, not over it
- Do not use solvent cleaners on the joint
Silicone can’t generally be painted, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. Resealing closes it.