Surrey · England
Sand mastic for sash & case windows in Bisley, Surrey
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Bisley, backed by a 12-month guarantee. Call for a quick quote.
- Draughts and rain around sash boxes
- Weathered mastic on the most exposed windows
- Patchy fillers round a sash window
About our sand mastic in Bisley
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. We are often asked to deal with old sand mastic that has cracked, crumbled or fallen out and gaps round a timber door in stone or brick, on period & listed homes, sash and case windows and tenement windows.
In smaller places like Bisley, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Bisley (GU24)
- Region
- Surrey
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to a full day, depending on how many windows and we leave things clean and tidy. In a smaller place like Bisley, 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 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 tricky access
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
Get a quote
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. We will explain what we’d do and send you a clear quote before we start.
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Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Other services in Bisley
How the job changes by surface
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
What happens if it’s left?
If you’re redecorating, renew the mastic first. Painting over failed mastic does not seal it and traditional guidance is to leave the new mastic unpainted. Homes in smaller places like Bisley can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why Bisley customers choose us
- More than 20 years in sealant work
- Rated 4.9 stars on Google
- Fully insured
- We never seal over old sealant
Bisley: your questions answered
Do you work for landlords with property near Brookwood station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Is Bisley in your area for sand mastic?
Yes. We work across London and the South East, and Bisley is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you guarantee sand mastic work?
Our 12-month guarantee covers every job.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They’ll tell you if consent is needed.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Common problems we fix in Bisley
Sand mastic slowly weathers. It dries out, cracks and loses its grip from the frame or the masonry.
It’s worth asking for a quote if you see:
- Old sand mastic that has cracked, crumbled or fallen out
- Tired mastic found when preparing windows for paint
- Cracked mastic round a front door frame
- Draughts and rain around sash boxes
Homes close to Church of St John the Baptist include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
Questions to ask before you book
- Are they insured?
- Whether VAT is included
- What the cure time is
- Is the old sealant removed completely?
Frames and glazing around Bisley
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Brookwood station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. Schools such as Bisley CofE Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Bisley is about 3 miles west of Woking, in Surrey. Every kind of property in Bisley is covered for sand mastic. The work is guaranteed for a year. Bisley is one of 395 places in Surrey where we work for sand mastic. We also work in Reading, about 17 miles from Bisley.
Here we cover the GU24 postcode area for sand mastic. Sand mastic is available to properties on Hawthorn Way, Germander Drive and Wilcot Close. Main roads around Bisley include the A322, so getting to you is simple. Other places close to Bisley include Lucas Green (1 mile north-west), West End (1 mile north), Knaphill (1 mile south-east), Sheet's Heath (1 mile south) and Penny Pot (1 mile north-east). Larger places within reach include Guildford (6 miles south-east), Woking (3 miles east), Camberley (4 miles west), Farnham (11 miles south-west), Egham (8 miles north-east) and Walton-on-Thames (11 miles east).
Near you in Bisley
Around Bisley, our work takes us to homes and buildings near Gordon's School, Bisley and West End Commons and The Crown pub, among other places. Bisley’s nearest station is Brookwood station, about 1.6 miles south. Other landmarks nearby include The Peacocks (3.3 miles east) and The Museum of The National Rifle Association (1.4 miles south-west). Open spaces near Bisley include Brookwood Lye.
Aftercare tips
Good habits help new joints last longer. A few tips:
- Keep modern sealant off the mastic
- Avoid heavy scraping on the mastic joint
- Plan mastic work ahead of painting
- Ask us before painting near the mastic
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.