Greater London · England
Sand mastic for sash & case windows in Old Town, Greater London
Sand mastic for Old Town, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps where the frame meets the masonry
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
Landlord and commercial work in Old Town
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Sand mastic in Old Town
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 old cement repairs round a window that have failed and a silicone bead on a sash window that spoils the look, on tenement windows, 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, in Old Town as anywhere.
A 12-month guarantee comes as standard.
- Place
- Old Town (CR0, CR9, CR90)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Old Town
Rain on the window surround works into any crack and loosens it further. Windows facing the weather tend to go first.
People normally contact us after spotting one of these:
- Weathered mastic on the most exposed windows
- Cement or filler used on old window joints that has cracked
- Mastic dropping out of the joint
- Draughts and rain around sash boxes
Rented homes near West Croydon station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Before booking anyone
- How hidden problems are handled
- Whether you can choose the colour
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
Frames and glazing around Old Town
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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
Managing a site like The Minster Nursery and Infant School? Then the mastic around its windows and doors needs looking after like any other building’s. As a London address, Old Town can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Old Town is about 1 mile north-west of Croydon, in Greater London. Across the CR0 area, we cover sand mastic for homes and businesses. Our area takes in 764 places across Greater London, large and small. We also work in London, around 9 miles away.
Jobs for sand mastic in CR0, CR9 and CR90 works the same way as everywhere else we cover. Whether your property is on Park Lane, Fell Road and Abbey Road or anywhere close by, we can help. We also cover the places around Old Town: Waddon (1 mile south-west), Broad Green (1 mile north), Beddington (1 mile west), Bandonhill (1 mile south-west) and Russell Hill (2 miles south-west). We also work in nearby towns such as London (9 miles north), City of Westminster (10 miles north), Marylebone (10 miles north), Kensington (10 miles north-west), St Pancras (11 miles north) and Shoreditch (11 miles north).
Landmarks near Old Town
Typical jobs here are in homes near Rutherford School, The Gun Tavern and St Andrew's CofE School. Old Town has its own railway station: West Croydon station. A little further out are Croydon University Hospital (1.2 miles north) and Croydon Airport Visitor Centre (1.3 miles south-west). Open spaces near Old Town include Roundshaw Downs and Duppas Hill.
What we do, step by step
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the job takes a few hours for a single window, longer for several in most cases. For a job in Old Town, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Clear items away from the joints we’re working on
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Get a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and send you a clear quote before we start.
Advice
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
How we quote for sand mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- Whether there’s mould to deal with
- Access and height
- The amount of work
- How many areas need sealing
Combining jobs into one visit usually makes better use of the time than several visits. We’ll give you a clear quote for the lot.
Helping us quote
When you call or email, it’s useful to know:
- The problem you’ve noticed
- If someone has resealed it before
- Roughly how big the job is
- Where the job is, and your postcode
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Leave it or put it right?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Old Town.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why book with us
- Old sealant always removed completely
- Anti-fungal sanitary silicone in wet areas
- A 12-month guarantee on all work
- 180+ five-star Google reviews
Read what affects the cost and our reviews.
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Ask a joiner to look at soft timber first
- Ask the planning authority about consent for listed or conservation-area homes
- Inspect the joints round the windows every year or so
- Make sure water runs off the sill
Don’t touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber and timber that stays wet can rot.
Also near Old Town
Other services in Old Town
FAQs for Old Town
Can parking be tricky for a visit in Old Town?
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.
Do you cover Old Town for sand mastic?
Yes. We work across London and the South East, and Old Town is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
When will the new mastic be hard?
It skins over fairly quickly but takes longer to harden fully. We will tell you what to expect for your job.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Do you work for landlords and businesses?
Yes, often. Several properties can go on one quote.
Are you fully insured?
Yes. We’re fully insured for domestic and commercial work.
What guarantee comes with the work?
Every job comes with our one-year guarantee.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.