Slough · England
Sand Mastic in Britwell
Window and door surrounds in Britwell need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
- Weathered mastic on the most exposed windows
When it is not the sealant
We’d rather tell you now than do work that won’t last, so these are the limits:
- Planning or listed building consent (your local planning authority decides)
- Timber that has rotted
- Sashes that rattle, stick or won’t open
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
What we seal
- Brick reveals
- Stone surrounds
- Sash and case windows
- Tenement windows
- Period & listed homes
- Timber door frames
Sand mastic for homes and businesses in Britwell
A silicone bead around a sash window can look out of place and does not suit the building. Sand mastic is the traditional choice, and we can replace one with the other. If you have mastic worn away on windows facing the weather and cracked mastic round a front door frame, we can help, on brick reveals, sash and case windows and period & listed homes alike.
Homes around Britwell range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
You are covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or send us an email.
- Place
- Britwell (SL2, SL1)
- Wider area
- Slough
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Britwell questions
Do you cover Britwell for sand mastic?
Yes, Britwell is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
I let a flat near Burnham station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or email us with the details for a clear quote.
Is it worth trying it myself?
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.
Where are you based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Do you have insurance?
Yes. We’re fully insured for domestic and commercial work.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
Different surfaces, different methods
Period and listed homes
Many older homes were built with sand mastic round the windows. If your home is listed, ask your local planning authority about consent.
Sash and case windows
The mastic round a sash window is on show so we finish it carefully.
Places near Britwell
What else we do in Britwell
What happens if it’s left?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and blends with the stone or brick. In an older home around Britwell, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why choose Mr Mastic in Britwell
- Approved under the ARBOMaster scheme
- Fully insured
- A 12-month guarantee on all work
- We leave the area clean and tidy
Take a look at our cost guide or customer reviews.
What we’re called out for in Britwell
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
It’s worth asking for a quote if you see:
- Mastic round period door frames that has failed
- Mastic worn away on windows facing the weather
- Cement or filler used on old window joints that has cracked
- Crumbling sand mastic round a window
Homes close to Church of St Mary include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What your quote should include
- Whether all the old sealant comes out first
- What product goes in the joint
- What happens if the job turns out different
- Who turns up on the day
What happens on the day
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours per window, depending on the condition of the joints in most cases. Parking around Britwell is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Tell us about any previous sealing or DIY attempts
- Mention any tricky access
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, call 0345 464 0079 or email us.
Read more
How to look after the new joints
To keep the joints looking good and working properly:
- Inspect the joints round the windows every year or so
- Leave the new mastic unpainted
- Keep sills and gutters clear so water drains away
- Have rotten timber repaired before new mastic goes in
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
Windows and doors in Britwell
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Dorney Court (about 2.9 miles south-west) are a reminder that the area around Britwell has older buildings as well as new. 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.
Schools such as Claycots School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. If you let a flat or house near Burnham station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Britwell is about 1 mile north-west of Slough, in Slough. If you need sand mastic in Britwell, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Slough from our Crawley base. Britwell is one of 31 places in Slough where we work. You can also see our page for Reading, roughly 16 miles from Britwell.
All of SL2 and SL1 is covered for sand mastic. If you need sand mastic at a property on Park Road, Crown Lane and Church Road or a nearby road, we can help. Close by, we work in Farnham Royal (1 mile north-east), East Burnham (1 mile north), Cippenham (1 mile south-west), Slough (1 mile south-east) and Burnham (2 miles west). Further out, we also cover Langley (4 miles south-east), Upton (3 miles south-east), Datchet (4 miles south-east), Ditton (4 miles south-east), Poyle (6 miles south-east) and Colnbrook (5 miles south-east). Being one of Slough’s larger places, Britwell has every kind of property, from flats to offices.
Local landmarks in Britwell
Locally, jobs take us to homes and businesses close to Beechwood School, Cocksherd Wood and The Duke's Head Public House and the streets around them. For rail, the closest station is Burnham station, about 1.2 miles south-west of the centre. Other landmarks nearby include The History On Wheels Museum (2.3 miles south) and Wexham Park Hospital (2.1 miles east). Not far away are Taplow Lake and Burnham Beeches.
For landlords and businesses
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.