Windsor and Maidenhead · England
Sand Mastic in Chavey Down
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Chavey Down, with a 12-month guarantee on every job. Ask us for a quote.
- Draughts and rain around sash boxes
- Weathered mastic on the most exposed windows
- Crumbling sand mastic round a window
Sand mastic in Chavey Down, done properly
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. If you’re dealing with cement or filler used on old window joints that has cracked and window mastic to renew ahead of painting, we can help, on timber door frames, tenement windows and stone surrounds alike.
In a village or hamlet like Chavey Down, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Chavey Down (SL5)
- Region
- Windsor and Maidenhead
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Chavey Down: your questions answered
Do you work for landlords with property near Martins Heron station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Will you come out to Chavey Down?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. The weather and joint depth both affect it.
Can I paint the new mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will advise.
Do you have insurance?
Yes. We’re fully insured.
Also near Chavey Down
Also in Chavey Down
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
What sand mastic looks like in Chavey Down
London and the South East are among 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 St Leonard's Hill (about 4.3 miles north-east) nearby, there’s older building stock in the area around Chavey Down as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Martins Heron station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near St Martin's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Chavey Down is about 2 miles east of Bracknell, in Windsor and Maidenhead. Every kind of property in Chavey Down is covered for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. We cover 57 towns and villages across Windsor and Maidenhead, large and small. Our Reading page covers work nearby (12 miles or so).
Work in SL5 works the same way as everywhere else we cover. That includes homes and businesses on Church Road, North Road and Long Hill Road. We also cover the places around Chavey Down: Warfield Park (1 mile north-west), Winkfield Row (1 mile north), Martins Heron (1 mile south-west), Bullbrook (1 mile west) and Whitegrove (1 mile north-west). We also work in nearby towns such as Maidenhead (7 miles north), Windsor (5 miles north-east), Boyn Hill (6 miles north), Cookham (10 miles north), Furze Platt (8 miles north) and Dedworth (5 miles north-east).
Landmarks near Chavey Down
Around Chavey Down, our work takes us to homes and buildings near Garth Hill College and Whitegrove Primary School. Chavey Down’s nearest station is Martins Heron station, about 1 mile south-west of the centre. Nearby you will also find The Lexicon (1.7 miles west) and Heatherwood Hospital (1.1 miles south-east). Open spaces near Chavey Down include Virginia Water Lake.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Take care around the mastic when scraping paint
- Keep modern sealant off the mastic
- Make sure water runs off the sill
- Find out about consent before window work on a listed home
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
What affects the quote in Chavey Down
For a quick quote, just ask. The main things that affect it are:
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- Access and height
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Any access issues, like height or stairs
- Whether it has been sealed before
- Whether it’s a home or a business
- Photos by email, if that is easy
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
What happens on the day
When we arrive, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. Most jobs take a few hours for a single window, longer for several. In a small place like Chavey Down, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Let us know about parking restrictions
- Let us know if you’ve seen damp or leaks
- Plan for the work area to be out of bounds to pets and children
How to get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
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Honest limits
To be straight with you, some problems need a different trade:
- Sashes that rattle, stick or will not open
- Broken panes
- Rotten sashes, sills or window boxes (a joiner’s job)
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Timber door frames
- Sash and case windows
- Period & listed homes
- Tenement windows
- Brick reveals
- Stone surrounds
Why it’s worth doing now in Chavey Down
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall so renewing it early protects the window. In a small place like Chavey Down, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, phone 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why Chavey Down clients choose us
- Domestic, commercial and hotel work
- We are fully insured
- 20+ years of sealant experience
- A 12-month guarantee on all work
Take a look at how sealant jobs are priced or our reviews.