Greater London · England
Sand Mastic in Coulsdon
We cover Coulsdon for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Window mastic to renew ahead of painting
- Cement or filler used on old window joints that has cracked
- Cracked mastic round a front door frame
Your questions about sand mastic in Coulsdon
I let a flat near Coulsdon South station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Is parking a problem for a job in Coulsdon?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
What information do you need?
The location, the problem and the rough size of the job. Photos by email help too.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint before the sand mastic goes in.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
How long does sand mastic take?
It depends on the size of the job, but as a guide it takes a few hours per window, depending on the condition of the joints. We’ll tell you when we quote.
Sand mastic in Coulsdon
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on brick reveals, sash and case windows and stone surrounds, and people most often call us about gaps between timber frames and stone or brick and patchy fillers round a sash window.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Coulsdon as anywhere.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Location
- Coulsdon (CR5, CR8, CR3)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Coulsdon
More services for Coulsdon
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
Leave it or put it right?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Coulsdon, the repair is bigger than a sealant job.
Combining jobs into one visit is generally more efficient than separate visits. You’ll get one clear quote for the whole job.
Why Coulsdon clients choose us
- 20+ years of sealant experience
- Full insurance on every job
- An ARBOMaster approved applicator
- Rated 4.9 stars on Google
What we do, step by step
Once we are on site, 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 for a single window, longer for several. For a job in Coulsdon, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or email us.
Advice
Coulsdon homes and the weather
With historic houses such as Nonsuch Mansion (about 4.9 miles north-west) nearby, there’s older building stock in the area around Coulsdon as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Coulsdon South station, cracked sand mastic around sash windows lets in the draughts tenants complain about. As a London address, Coulsdon can be tricky for parking: let us know about parking bays, permits or a driveway. For site and facilities teams at buildings such as Smitham Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Coulsdon is about 13 miles south of London, in Greater London. If you need sand mastic in Coulsdon, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We’re based in Crawley and cover Greater London. Coulsdon is one of 764 places in Greater London where we work for sand mastic. We also work in London, around 13 miles away.
Jobs for sand mastic in CR5, CR8 and CR3 is quoted and booked the same way as anywhere else. We cover properties on Hadleigh Grove, Farthing Way and Dobson Close and the roads around them. You will find Coulsdon on the B276 and B2030, which makes it straightforward to reach with everything needed for sand mastic. Neighbouring places we cover for sand mastic include Woodcote (1 mile north), Old Coulsdon (1 mile south-east), Woodmansterne (1 mile west), Chipstead (1 mile south-west) and Purley (2 miles north-east). We also work in nearby towns such as London (13 miles north), City of Westminster (14 miles north), Marylebone (14 miles north), Kensington (13 miles north), St Pancras (15 miles north) and Shoreditch (15 miles north).
Landmarks near Coulsdon
We work in homes and buildings around Dollypers Hill, Coulsdon Sixth Form College and The Pembroke pub. Coulsdon has its own railway station: Coulsdon South station. Well-known places in the area include Croydon Airport Visitor Centre (3 miles north) and Purley War Memorial Hospital (2 miles north-east). Open spaces near Coulsdon include Duppas Hill and Mercers Lake.
Aftercare tips
To keep the joints looking good and working properly:
- Clear gutters so water does not pour onto the windows
- Take care around the mastic when scraping paint
- Have rotten timber repaired before new mastic goes in
- Sort the mastic before the decorators arrive
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
Landlord and commercial work in Coulsdon
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured.
Different surfaces, different methods
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
When something else is needed
In fairness, there are a few things sealant will not fix:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Whether work needs listed building consent
- Crumbling stone or brickwork round the window
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
Where we work in Coulsdon
- Tenement windows
- Timber door frames
- Brick reveals
- Period & listed homes
- Sash and case windows
- Stone surrounds