Greater London · England
Sand mastic for sash & case windows in Kenley, Greater London
Window and door surrounds in Kenley need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Gaps round a timber door in stone or brick
- Draughty sash windows at the surround
- Weathered mastic on the most exposed windows
About our sand mastic in Kenley
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap so the surround looks right again. We work on period & listed homes, stone surrounds and tenement windows, and people most often call us about mastic that needs renewing before redecorating and patchy fillers round a sash window.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Kenley is something to talk through when you book.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Kenley (CR8, CR2)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Kenley homes and the weather
With historic houses such as Addington Palace (about 3.3 miles north-east) nearby, there’s older building stock in the area around Kenley as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
Kenley is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near Kenley station, any sash windows need sound mastic to keep draughts and rain out.
Kenley is about 1 mile south-east of Purley, in Greater London. We carry out sand mastic for homeowners, landlords and businesses in Kenley and nearby, as part of our work across Greater London. Across Greater London, we cover 764 places, and Kenley is one of them. Our London page covers work nearby, about 12 miles away.
All of CR8 and CR2 is within our area for sand mastic. Streets in the area include Oaks Road, Park Road and Roke Road. Main roads around Kenley include the A22. Neighbouring places we cover for sand mastic include Riddlesdown (1 mile north), Sanderstead (1 mile north-east), Whyteleafe (1 mile south-east), Hamsey Green (1 mile east) and South Croydon (2 miles north). Within a short drive, we also cover London (12 miles north), City of Westminster (13 miles north), Marylebone (14 miles north), Kensington (13 miles north), St Pancras (14 miles north) and Shoreditch (14 miles north).
Near you in Kenley
In Kenley, that means homes and buildings near Dollypers Hill and Riddlesdown Collegiate, among other places. There’s a railway station in Kenley itself: Kenley station. A little further out are St George's Walk (3.4 miles north) and Croydon Airport Visitor Centre (2.4 miles north). For a walk, there’s Duppas Hill and Foxley Wood.
What affects the cost of sand mastic
For a quick quote, just ask. What matters most is:
- When we can work, for business premises
- The number of rooms or windows
- The number and length of the joints
- Whether the work is at height
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- Roughly how big the job is
- The problem you’ve noticed
Want a quote for sand mastic? Please ring 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear quote before work begins.
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
Kenley questions
I let a flat near Kenley station. Can you help?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is Kenley in your area for sand mastic?
Yes, Kenley is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Should I use sand mastic or silicone?
We will talk it through with you. Sand mastic suits many period homes, and modern sealants suit newer frames.
How long does the job take?
Most jobs take anything from a few hours to a full day, depending on how many windows. Your quote will say how long we expect yours to take.
Where do you work from?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Do you offer different sealant colours?
In most cases you can choose. We will tell you which colours the right product comes in.
What exactly is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s applied by hand and finished to sit neatly against the masonry.
Leave it or put it right?
Filling over old, loose mastic does not last. We remove the loose material first so the new work lasts. In a flat in Kenley, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- More than 20 years in sealant work
- Rated 4.9 stars on Google
- An ARBOMaster approved applicator
- Neat joints and a tidy finish
Take a look at our cost guide and our reviews.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep sills and gutters clear so water drains away
- Avoid patching sand mastic with silicone
- Sort the mastic before the decorators arrive
- Find out about consent before window work on a listed home
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
Other services in Kenley
Do you need sand mastic in Kenley?
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint.
People normally contact us when they notice one of these:
- Weathered mastic on the most exposed windows
- Draughty sash windows at the surround
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps where the frame meets the masonry
For site and facilities teams at buildings such as Harris Primary Academy Kenley, its window and door frames need their mastic kept sound, just like a home’s.
Before you book anyone
- How the colour is chosen
- Which sealant they’ll use, and why
- What the quote includes, VAT included or not
- Are they insured?
The process
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to a full day, depending on how many windows. In Kenley, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Clear items away from the joints we’re working on
- Mention any tricky access
- Let us know if you’ve seen damp or leaks
Ask for a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Related advice
Honest limits
To be straight with you, some problems need a different trade:
- Crumbling stone or brickwork round the window
- Cracked or broken glass
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Period & listed homes
- Tenement windows
- Timber door frames
- Sash and case windows
- Stone surrounds
- Brick reveals