Greater London · England
Sand Mastic in North Cheam
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in North Cheam, with a 12-month guarantee on every job. Call for a quick quote.
- Cracked mastic round a front door frame
- Old sand mastic that has cracked, crumbled or fallen out
- Tired mastic found when preparing windows for paint
Sand mastic in North Cheam, done properly
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. We’re often asked to deal with tired mastic found when preparing windows for paint and draughts and rain around sash boxes, on period & listed homes, sash and case windows and brick reveals.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- North Cheam (SM3, KT4, SM1)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in North Cheam
Can you do sand mastic in North Cheam?
Yes. Our work covers London and the South East, and North Cheam is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
Can you help a landlord with a rental near West Sutton station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover North Cheam and the rest of Greater London.
How long does the job take?
Most jobs take a few hours per window, depending on the condition of the joints, including the preparation. Your quote will say how long we expect yours to take.
What’s sand mastic made of?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask the planning authority about consent for listed or conservation-area homes
- Renew mastic before redecorating the windows
- Keep modern sealant off the mastic
- Do not paint over the new mastic
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
Also near North Cheam
Other services in North Cheam
Why it’s worth doing now in North Cheam
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in North Cheam.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Why book with us
- We’re fully insured
- ARBOMaster approved applicator
- Sanitary silicone with an anti-fungal additive in wet areas
- Tidy, careful work
See our cost guide or customer reviews.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams. Several sites can be quoted together, and we are fully insured for the work.
How the visit works
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a single window, longer for several. In North Cheam, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- 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
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
- For business premises, tell us about site rules or sign-in
Get a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we’ll take it from there.
Advice
Frames and glazing around North Cheam
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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
For an older house near a landmark such as St Oswald Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Cheam Park Farm Primary Academy? Then its window and door frames need their mastic kept sound, just like a home’s.
North Cheam is about 3 miles north-east of Epsom, in Greater London. North Cheam gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. North Cheam is one of 764 towns and villages in Greater London we cover for sand mastic. You can also see our page for London, roughly 10 miles from North Cheam.
Here we cover the SM3, KT4 and SM1 postcode area for sand mastic. You will find streets such as Glyn Road, Covey Road and Lloyd Road, all of which we cover. If you’re just outside North Cheam, we cover Cuddington (1 mile south-west), Lower Morden (1 mile north), Sutton Common (1 mile north-east), Stoneleigh (1 mile south-west) and Morden (2 miles north). We also work in nearby towns such as London (10 miles north-east), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (9 miles north), St Pancras (12 miles north) and Shoreditch (12 miles north-east).
What’s near North Cheam
Locally, jobs take us to homes and businesses close to The Nonsuch Inn, Sutton College of Learning for Adults and Nonsuch Park and the streets around them. For rail, the closest station is West Sutton station, roughly 0.8 miles south-east. A little further out are Chessington Castle Hill (3.2 miles west) and St. Anthony's Hospital (0.6 miles north). For a walk, there’s Henman Hill and Derwent Floodwash.
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- The number of rooms or windows
- Whether there’s mould to deal with
- The type of sealant required
- Any working-time requirements on site
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, and we’ll explain the quote if you ask.
What to tell us for a quote
When you call or email, these details help:
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
We quote each job on its own. Just call 0345 464 0079 or send us an email with the details.
Do you need sand mastic in North Cheam?
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Look out for any of the following:
- Mastic dropping out of the joint
- Open joints round the window box
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
North Cheam is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before you book
- How the surfaces are prepared before sealing
- Who turns up on the day
- What the cure time is
- What insurance they hold
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.