Greater London · England
Purley Sand Mastic
Problem with your window and door surrounds in Purley? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Gaps between timber frames and stone or brick
- Cement or filler used on old window joints that has cracked
- Tired mastic found when preparing windows for paint
About our sand mastic in Purley
We work across Purley renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. We work on tenement windows, timber door frames and stone surrounds, and the jobs we see most are window mastic to renew ahead of painting and open joints round the window box.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Place
- Purley (CR8, CR2, CR5)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Purley homes and the weather
Historic houses like Addington Palace (about 3.6 miles north-east) are a reminder that the area around Purley has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Purley is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Schools such as Christ Church CofE Primary School (Purley) are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Purley is about 2 miles south-west of Croydon, in Greater London. Anywhere in CR8, we cover sand mastic for homes and businesses. Our Greater London coverage runs to 764 places, and Purley is one of them. You can also see our page for London, about 11 miles away.
Postcode districts we cover here for sand mastic: CR8, CR2 and CR5. Whether your property is on High Street, Church Road and Brighton Road or a nearby road, our applicators can take on the job. Purley is on the A2022, which makes it straightforward to reach with everything needed for sand mastic. We also cover the places around Purley: Peaks Hill (1 mile north-west), Woodcote (1 mile west), Russell Hill (1 mile north), Roundshaw (1 mile north-west) and Woodcote Green (1 mile west). Further out, we also cover London (11 miles north), City of Westminster (12 miles north), Marylebone (13 miles north), Kensington (12 miles north), St Pancras (13 miles north) and Shoreditch (13 miles north).
What’s near Purley
We work in homes and buildings around The Jolly Farmers pub, Laleham Lea School and Thomas More Catholic School, among other places. There’s a railway station in Purley itself: Purley station. Other landmarks nearby include Purley War Memorial Hospital (under half a mile north-east) and St George's Walk (2.7 miles north). Open spaces near Purley include Duppas Hill and Foxley Wood.
FAQs for Purley
I let a flat near Purley station. Can you help?
Yes. We work for landlords and agents as well as householders. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can parking be tricky for a visit in Purley?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can I add another job to the visit?
Yes, we can. More than one area can go on one quote.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Can you replace silicone on a period window with sand mastic?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They’ll tell you if consent is needed.
How long does the job take?
It depends on the size of the job, but as a guide it takes a few hours for a single window, longer for several. We will give you a better idea when we quote.
Why deal with it now?
An open joint round the frame lets weather in. Water can get to the frame and the masonry, 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. Putting it right early is much less trouble.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Purley
- Neat joints and a tidy finish
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
- One-year guarantee on every job
Take a look at what affects the cost or our reviews.
Places near Purley
More services for Purley
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
If you manage several properties in or around Purley, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Do you need sand mastic in Purley?
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
Look out for these signs:
- Mastic that needs renewing before redecorating
- Crumbling sand mastic round a window
- Modern sealant on a period surround
- Gaps round a timber door in stone or brick
For landlords with property near Purley station, older sash windows in a rental need their mastic kept sound to keep the weather out.
What your quote should include
- When the joint can take water or movement
- What happens if the job turns out different
- Whether VAT is included
- Are they insured?
When it isn’t the sealant
Before booking, it’s worth knowing the limits:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Broken panes
- Crumbling stone or brickwork round the window
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Surfaces we seal
- Tenement windows
- Timber door frames
- Brick reveals
- Period & listed homes
- Stone surrounds
- Sash and case windows
Keeping the joints in good condition
Aftercare is simple:
- Check with your local planning authority if your home is listed
- Plan mastic work ahead of painting
- Avoid patching sand mastic with silicone
- Look over the window mastic once a year
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
What we do, step by step
At the end, we look at the finished work together. The visit itself normally takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Purley. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved.
Advice
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.