Windsor and Maidenhead · England
Sand mastic for sash & case windows in Cox Green, Windsor and Maidenhead
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Cox Green and across Windsor and Maidenhead. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic worn away on windows facing the weather
- A silicone bead on a sash window that spoils the look
- Mastic round period door frames that has failed
How we handle sand mastic in Cox Green
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted and we’ll advise if you’re redecorating. We’re often asked to deal with mastic worn away on windows facing the weather and modern sealant on a period surround, on sash and case windows, period & listed homes and tenement windows.
In smaller places like Cox Green, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Place
- Cox Green (SL6)
- Wider area
- Windsor and Maidenhead
- Cover
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- How much old sealant there is and how hard it is to remove
- When we can work, for business premises
- How easy the joints are to reach
- Mould in or behind the old joints
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.
What we need to know
You do not need to know the technical terms. Just tell us:
- Whether it has been sealed before
- The rough size of the job
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Keeping the joints in good condition
Looking after new joints is easy:
- Have rotten timber repaired before new mastic goes in
- Do not run silicone over sand mastic
- Inspect the joints round the windows every year or so
- Plan mastic work ahead of painting
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Why act early in Cox Green
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new work lasts. Around Cox Green, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- Tidy, careful work
- Any old sealant cut out fully, not covered over
- ARBOMaster approved applicator
- Over 20 years’ experience
Nearby places to Cox Green
Other services in Cox Green
What sand mastic looks like in Cox Green
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. With historic houses such as Dorney Court (about 3.2 miles east) nearby, there’s older building stock in the area around Cox Green 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.
If you look after a building such as Wessex Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near All Saints' Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Maidenhead station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Cox Green is about 1 mile south-west of Maidenhead, in Windsor and Maidenhead. Across the SL6 area, we can carry out sand mastic at your property. Cox Green is one of 57 places in Windsor and Maidenhead we cover for sand mastic. Reading is on our list too, about 11 miles from Cox Green.
Postcode districts we cover here for sand mastic: SL6. Local streets include Lock Lane, Curls Road and Thrift Lane, and we cover them all. Main roads around Cox Green include the A404(M), so getting to you is simple. Neighbouring places we cover for sand mastic include Boyn Hill (1 mile north-east), Maidenhead (1 mile north-east), Woolley Green (1 mile west), Bray Wick (1 mile east) and Pinkneys Green (2 miles north-west). Within a short drive, we also cover Windsor (5 miles south-east), North Ascot (7 miles south), Cookham (3 miles north), Dedworth (5 miles south-east), Broomhall (9 miles south-east) and South Ascot (8 miles south). Cox Green is among the bigger towns we cover in Windsor and Maidenhead.
Local landmarks in Cox Green
Typical jobs here are in homes near Ockwells Park, The Crown pub and Cox Green School and the streets around them. The nearest railway station is Maidenhead station, about 1.1 miles north-east. Nearby you will also find St Mark's Hospital (1.2 miles north) and The Reitlinger Bequest Museum (1.9 miles north-east). Green spaces nearby include Weycock Hill and Taplow Lake.
The process
On the day, we start by going over the job with you. We protect the surfaces around the joints before any work begins. Most jobs take a few hours per window, depending on the condition of the joints. In a smaller place like Cox Green, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Move anything stored near the joints
- Where the joints are inside, avoid wetting them before we arrive
- Plan for the work area to be out of bounds to pets and children
How to get a quote
For sand mastic in Cox Green, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before we start.
Related advice
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Sashes that need overhauling
- Crumbling stone or brickwork round the window
- Putty and glazing repairs
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Surfaces we seal
- Tenement windows
- Stone surrounds
- Period & listed homes
- Brick reveals
- Timber door frames
- Sash and case windows
Your questions about sand mastic in Cox Green
I let a flat near Maidenhead station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Is Cox Green within the area you cover?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Should I use sand mastic or silicone?
Sand mastic generally suits period timber windows best. On modern frames, we’d normally use a flexible sealant.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
How long does the job take?
Typically it takes a few hours per window, depending on the condition of the joints. Bigger jobs take longer, and we will tell you how long to expect.
How long does sand mastic take to go off?
It takes a while. It skins first and hardens fully later and we will give you an idea for your job.
Can I paint the new mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Surface by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.