Surrey · England
Sand mastic for sash & case windows in Box Hill, Surrey
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Box Hill, with a one-year guarantee on every job. Ask us for a quote.
- Draughts and rain around sash boxes
- A silicone bead on a sash window that spoils the look
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic for homes and businesses in Box Hill
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. We work on tenement windows, stone surrounds and period & listed homes, and the jobs we see most are gaps where the frame meets the masonry and patchy fillers round a sash window.
In a village or hamlet like Box Hill, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Where
- Box Hill (KT20)
- Wider area
- Surrey
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
So the new joints stay in good condition:
- Do not paint over the new mastic
- Check with your local planning authority if your home is listed
- Renew mastic before redecorating the windows
- Don’t run silicone over sand mastic
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Nearby places to Box Hill
Other services in Box Hill
What we do, step by step
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a single window, longer for several. In a small place like Box Hill, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- 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.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
- Mention any tricky access
Ask for a quote
For sand mastic in Box Hill, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
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When something else is needed
We’ll always be straight with you, so here’s what sealant can’t fix:
- Masonry that needs repairing
- Planning or listed building consent (your local planning authority decides)
- Sashes that rattle, stick or won’t open
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Period & listed homes
- Timber door frames
- Tenement windows
- Stone surrounds
- Brick reveals
- Sash and case windows
What happens if it’s left?
Not every filler suits an old window surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. Where a wall is exposed, as many are in small places like Box Hill, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
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.
What you get with us
- Full insurance on every job
- Approved under the ARBOMaster scheme
- We leave the area clean and tidy
- 180+ five-star Google reviews
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Windows and doors in Box Hill
With historic houses such as Polesden Lacey (about 3.9 miles west) nearby, there’s older building stock in the area around Box Hill as well as newer homes. 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. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like The Ashcombe School? Then its window and door frames need their mastic kept sound, just like a home’s. Homes close to St. Andrew's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Rented homes near Betchworth station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Box Hill is about 2 miles north-east of Dorking, in Surrey. Our applicators cover sand mastic for householders, landlords and businesses in Box Hill, as part of our work across Surrey. Our Surrey coverage runs to 395 places, and Box Hill is one of them. Our Crawley page covers work nearby (11 miles or so).
Postcode districts we cover here for sand mastic: KT20. If you need sand mastic at a property on Boxhill Road, Usherwood Close and Fort Road or anywhere close by, we can help. Close by, we work in Betchworth (1 mile south-east), Brockham (1 mile south), Buckland (1 mile south-east), Strood Green (2 miles south) and Headley (2 miles north). Further out, we also cover Guildford (12 miles west), Woking (13 miles west), Epsom (6 miles north), Horley (7 miles south-east), Redhill (5 miles east) and Ewell (7 miles north).
What’s near Box Hill
We work in homes and buildings around Brockham Limeworks. The closest station to Box Hill is Betchworth station, about 0.8 miles east of the centre. Nearby you’ll also find Headley Court (2.8 miles north) and Reigate Priory Museum (3.6 miles east). Open spaces near Box Hill include Colley Hill and Reigate Heath.
Box Hill: your questions answered
I let a flat near Betchworth station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Can you do sand mastic in Box Hill?
Yes. Our work covers London and the South East, and Box Hill is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
Is consent needed for window work on a listed home?
Check with your local planning authority. They decide whether consent is needed for work to your windows.
Where do you work from?
We work from Crawley. Our applicators cover Box Hill, along with the rest of our area.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you don’t need to watch us work.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will advise.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or send us an email.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme.
Work for landlords, hotels and businesses
We work for landlords and agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
How the job changes by surface
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.