Greater London · England
Sand Mastic in Old Chiswick
Sand mastic across Old Chiswick and nearby, with old sealant always removed completely and a 12-month guarantee.
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
- Tired mastic found when preparing windows for paint
Sand mastic in Old Chiswick: local notes
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 a converted house or block, who looks after the windows depends on the lease, so check that before booking.
Old Chiswick is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For an older house near a landmark such as St. Nicholas Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Old Chiswick is about 2 miles south of Acton, in Greater London. Whether you are in the middle of Old Chiswick or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Our area takes in 764 places across Greater London. London is on our list too, around 7 miles away.
Work in W4, SW13 and W6 is quoted and booked the same way as anywhere else. Streets in the area include Short Road, Quick Road and Paxton Road, and we cover them all. If you are just outside Old Chiswick, we cover Turnham Green (1 mile west), Chiswick (1 mile north-west), Grove Park (1 mile west), Barnes (1 mile south) and Hammersmith (1 mile north-east). Further out, we also cover London (7 miles east), City of Westminster (5 miles north-east), Marylebone (5 miles north-east), St Pancras (6 miles north-east), Shoreditch (8 miles east) and Walthamstow (12 miles north-east).
Near you in Old Chiswick
We work in homes and buildings around George and Devonshire pub, The Swedish School and Polish Library POSK in London, among other places. Other local landmarks include Turnham Green (0.8 miles north-west) and Chiswick School (0.5 miles south-west). The closest station to Old Chiswick is Chiswick station, roughly 0.8 miles south-west of the centre. Well-known places in the area include Kurdish Museum Library and Archive (0.7 miles north-east) and West London Hospital (1.3 miles east). The countryside around Old Chiswick includes Campden Hill and Kew Gardens Lake.
Sand mastic in Old Chiswick, done properly
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. If you’re dealing with window mastic to renew ahead of painting and cement or filler used on old window joints that has cracked, we can help.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Old Chiswick.
Each job carries a 12-month guarantee, large or small.
- Where
- Old Chiswick (W4, SW13, W6)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Old Chiswick
Other services in Old Chiswick
How to look after the new joints
To keep the joints looking good and working properly:
- Ask us before painting near the mastic
- Avoid patching sand mastic with silicone
- Have rotten timber repaired before new mastic goes in
- Go gently near the mastic when preparing windows
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
FAQs for Old Chiswick
Is parking an issue for sand mastic in Old Chiswick?
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.
Can you do sand mastic in Old Chiswick?
Yes. Our work covers London and the South East, and Old Chiswick is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
Can you replace silicone on a period window with sand mastic?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Is consent needed for window work on a listed home?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like, but they decide.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
How the visit works
On the day, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. 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.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Mention any sign-in or site rules at work premises
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Related advice
Honest limits
New sealant cannot fix everything, and we’d rather say so up front. Sealant will not put right:
- Damaged stone surrounds
- Planning or listed building consent (your local planning authority decides)
- Cracked or broken glass
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Period & listed homes
- Tenement windows
- Brick reveals
- Sash and case windows
- Timber door frames
- Stone surrounds
Common problems we fix in Old Chiswick
Some old mastic was never deep enough. A thin layer does not hold well, which is why we pack deep voids first and get the depth right.
Any of these means the joints need attention:
- Gaps between timber frames and stone or brick
- Draughty sash windows at the surround
- Mastic that needs renewing before redecorating
- A silicone bead on a sash window that spoils the look
If you look after a building such as The William Hogarth Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How much experience the applicator has
- Whether VAT is included
- Are they insured?
- What product goes in the joint
Why deal with it now?
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in Old Chiswick.
Doing several joints on one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What you get with us
- Any old sealant cut out fully, not covered over
- Trusted Arbo and Everbuild sealants
- Full insurance on every job
- Anti-fungal sanitary silicone in wet areas
Take a look at how sealant jobs are priced and our reviews.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.