Greater London · England
Kew Sand Mastic
Professional sand mastic in and around Kew, with every bit of old sealant taken out first.
- Mastic round period door frames that has failed
- Window mastic to renew ahead of painting
- Mastic dropping out of the joint
What happens on the day
You do not need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes a few hours per window, depending on the condition of the joints in most cases. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Related advice
Sand mastic in Kew
We work across Kew renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. Common call-outs are for tired mastic found when preparing windows for paint and wind and rain getting in round a sash window, across period & listed homes, stone surrounds and timber door frames.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Kew is something to talk through when you book.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Kew (W4, TW9, TW8)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we are called out for in Kew
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Keep an eye out for these signs:
- Gaps round a timber door in stone or brick
- Weathered mastic on the most exposed windows
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
If you live in an older home near St Paul's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- Is VAT in the price?
- How long to leave it before use
- What happens if the job turns out different
- How the surfaces are prepared before sealing
Frames and glazing around Kew
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. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Letting a property close to Chiswick station? Then any sash windows need sound mastic to keep draughts and rain out. For site and facilities teams at buildings such as Grove Park Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Kew is about 2 miles south of Acton, in Greater London. We carry out sand mastic for homes and businesses in Kew and nearby. Across Greater London, we cover 764 places, and Kew is one of them. We also work in London, about 8 miles from Kew.
Postcode districts we cover here for sand mastic: W4, TW9 and TW8. We cover properties on Kew Road, Maze Road and Kent Road and the roads around them. With the A3000 close by, Kew is easy for our applicators to reach for sand mastic. Close by, we work in Strand-on-the-Green (1 mile north), Grove Park (1 mile east), North Sheen (1 mile south), Gunnersbury (1 mile north) and Turnham Green (1 mile east). Further out, we also cover London (8 miles east), City of Westminster (6 miles east), Marylebone (6 miles north-east), Kensington (3 miles east), St Pancras (7 miles north-east) and Shoreditch (9 miles east).
Landmarks near Kew
Locally, jobs take us to homes and businesses close to Library for Iranian Studies, Kew Green and Chiswick School. Also close by are Kew College Prep (under half a mile south-west) and Bull's Head pub (under half a mile north). The closest station to Kew is Chiswick station, about 0.5 miles south-east. A little further out are Livat Hammersmith (2.2 miles east) and Barnes Hospital (1.5 miles south-east). Green spaces nearby include Kew Gardens Lake and Duke's Hollow.
When it is not the sealant
We’ll always be straight with you, so here’s what new sealant won’t do:
- Putty and glazing repairs
- Rotten sashes, sills or window boxes (a joiner’s job)
- Crumbling stone or brickwork round the window
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Brick reveals
- Tenement windows
- Sash and case windows
- Stone surrounds
- Period & listed homes
- Timber door frames
Why it’s worth doing now in Kew
If you are redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Kew, the repair is bigger than the sealant job would have been.
A few things move the cost up or down: 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 Kew customers choose us
- Experience in homes, commercial sites and hotels
- We’re fully insured
- Any old sealant cut out fully, not covered over
- Tidy, careful work
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Check with your local planning authority if your home is listed
- Inspect the joints round the windows every year or so
- Avoid heavy scraping on the mastic joint
- Keep sills and gutters clear so water drains away
Don’t run silicone over the new mastic. If you see a crack, ask us to take a look rather than patching it.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
Kew questions
I let a flat near Chiswick station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Do you cover Kew for sand mastic?
Yes. Our work covers London and the South East, and Kew is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Can you match the sealant colour?
Most of the time, yes. We will explain which colours are available and agree one before we start.
Do you guarantee sand mastic work?
There’s a 12-month guarantee on every job, sand mastic included.
How much does sand mastic cost in Kew?
Size, access and the old material all affect the cost. Call for a quick quote.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
What affects the cost of sand mastic
We do not publish a price list, because no two jobs are the same. The quote depends on:
- The old material and how stubborn it is
- Access and height
- Any mould that needs treating
- Which sealant suits the joint
What you pay reflects the work, not guesswork. That’s why we ask about the job first and give you a clear price before work begins.
Helping us quote
To help us quote quickly, let us know:
- Photos by email, if that is easy
- What’s wrong with the joints now
- Any access issues, like height or stairs
- Where the property is
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.