Surrey · England
Sand mastic for sash & case windows in Betchworth, Surrey
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Betchworth, with a 12-month guarantee on every job. Call for a quick quote.
- Patchy fillers round a sash window
- A silicone bead on a sash window that spoils the look
- Gaps between timber frames and stone or brick
Sand mastic for homes and businesses in Betchworth
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on brick reveals, sash and case windows and period & listed homes, and people most often call us about old cement repairs round a window that have failed and draughty sash windows at the surround.
Outdoor sealant needs dry, clean surfaces, so work on frames around Betchworth is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Our work is backed for twelve months.
- Place
- Betchworth (RH3)
- Wider area
- Surrey
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
If you manage several properties in or around Betchworth, several properties can go on one quote. Send us the addresses and the work at each.
Common questions in Betchworth
I let a flat near Betchworth station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Do you cover Betchworth for sand mastic?
Yes, Betchworth is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll send you a clear quote.
Which products do you use?
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.
Can I choose the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Can you replace silicone on a period window with sand mastic?
Normally, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Where are you based?
We’re based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Why it’s worth doing now in Betchworth
Before painting the windows, it pays to renew the mastic. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. Older cottages and farmhouses around Betchworth can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why book with us
- More than 20 years in sealant work
- Every job guaranteed for a year
- We never seal over old sealant
- Arbo and Everbuild products
Read what affects the cost or our reviews.
Surface by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
Honest limits
In fairness, some problems need a different trade:
- Decayed frames that need repair
- Decisions on consent for listed homes
- Masonry that needs repairing
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
What we seal
- Stone surrounds
- Sash and case windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Tenement windows
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Common problems we fix in Betchworth
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Look out for these signs:
- Old sand mastic that has cracked, crumbled or fallen out
- Cement or filler used on old window joints that has cracked
- Weathered mastic on the most exposed windows
- Modern sealant on a period surround
For an older house near a landmark such as Church of St Michael, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before you book anyone
- When the joint can take water or movement
- Is the old sealant removed completely?
- Are they insured?
- What happens if the job turns out different
What we do, step by step
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours per window, depending on the condition of the joints. In a small place like Betchworth, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- On commercial sites, let us know about site rules
- Tell us if parking is tricky
- Keep children and pets away from the work area
Getting a quote
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job, and we will take it from there.
Related advice
Sand mastic in Betchworth: local notes
Historic houses like Polesden Lacey (about 4.7 miles west) are a reminder that the area around Betchworth has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
Schools such as North Downs Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Betchworth station, any sash windows need sound mastic to keep draughts and rain out.
Betchworth is about 3 miles east of Dorking, in Surrey. Homes, rented property, offices and hotels in Betchworth is covered for sand mastic. The work is guaranteed for a year. 395 places in Surrey are on our list. You can also see our page for Crawley, about 10 miles away.
Our applicators cover all of RH3 for sand mastic and the streets around it. You will find streets such as The Street, Station Road and Old Reigate Road, all of which we cover. Other places close to Betchworth include Buckland (1 mile east), Brockham (1 mile south-west), Box Hill (1 mile north-west), Strood Green (1 mile south-west) and Dawesgreen (2 miles south). Within a short drive, we also cover Guildford (13 miles west), Woking (14 miles west), Epsom (7 miles north), Horley (6 miles south-east), Redhill (4 miles east) and Ewell (8 miles north).
Landmarks near Betchworth
We work in homes and buildings around The Red Lion pub and Brockham Limeworks, among other places. The nearest railway station is Betchworth station, roughly 0.5 miles north of the centre. A little further out are Reigate Priory Museum (2.7 miles east) and Headley Court (3.6 miles north). Green spaces nearby include Reigate Heath and Box Hill.