Greater London · England
Sand mastic for sash & case windows in Walham Green, Greater London
Specialist sand mastic for Walham Green: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Mastic that needs renewing before redecorating
- Draughts and rain around sash boxes
- Weathered mastic on the most exposed windows
Sand mastic in Walham Green, done properly
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you are dealing with modern sealant on a period surround and mastic round period door frames that has failed, we can help, on brick reveals, sash and case windows and stone surrounds alike.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
There’s a 12-month guarantee on every job.
- Place
- Walham Green (SW6, SW10, SW11)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Nearby places to Walham Green
Also in Walham Green
Aftercare tips
A little care helps the new joints last. Our advice:
- Keep modern sealant off the mastic
- Don’t paint over the new mastic
- Go gently near the mastic when preparing windows
- Check with your local planning authority if your home is listed
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
When to call us in Walham Green
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
Most people get in touch after spotting something like this:
- Modern sealant on a period surround
- Draughts and rain around sash boxes
- Gaps between timber frames and stone or brick
- Old cement repairs round a window that have failed
For site and facilities teams at buildings such as Chelsea Independent College, the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- Who turns up on the day
- Whether VAT is included
- Whether the sealant suits the joint
- How hidden problems are handled
When it is not the sealant
In fairness, some problems need a different trade:
- Sashes that need overhauling
- Planning or listed building consent (your local planning authority decides)
- Putty and glazing repairs
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Walham Green
- Sash and case windows
- Stone surrounds
- Tenement windows
- Period & listed homes
- Timber door frames
- Brick reveals
Windows and doors in Walham Green
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. With historic houses such as Carlyle's House (about 1 mile north-east) nearby, there’s older building stock in the area around Walham Green as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For an older house near a landmark such as Church of St John, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you let a flat or house near Imperial Wharf station, any sash windows need sound mastic to keep draughts and rain out.
Walham Green is about 2 miles south of Kensington, in Greater London. Whether you’re in the middle of Walham Green or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, and Walham Green is one of them.
Our applicators cover all of SW6, SW10 and SW11 for sand mastic. Whether your property is on Farm Lane, Lots Road and Epple Road or anywhere close by, we can help. You will find Walham Green on the A304, so it’s easy for us to get to with everything needed for sand mastic. Close by, we work in Chelsea Harbour (1 mile south-east), Parsons Green (1 mile south-west), World's End (1 mile north-east), Sands End (1 mile south-east) and West Brompton (1 mile north). Further out, we also cover London (4 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).
What’s near Walham Green
In Walham Green, that means homes and buildings near Natural History Museum Library and Archives, Heatherley School of Fine Art and Langford Primary School. Also close by are William Parnell Park (less than half a mile south) and The Rose pub (under half a mile south-east). Walham Green has its own railway station: Imperial Wharf station. A little further out are Chelsea Stadium Tour And Museum (within half a mile north) and Chelsea and Westminster Hospital (0.5 miles north-east). Green spaces nearby include Battersea Park Lake and WWT London Wetland Centre.
Quotes for sand mastic in Walham Green
There’s no set price list, because no two jobs are the same. What we look at:
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- Access and height
- Working hours on commercial sites
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- A few photos by email, if you can
- Access, such as stairs, a lift or height
- The rough size of the job
- The type of property
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
The process
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a single window, longer for several and we leave things clean and tidy. In Walham Green, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
Ask for a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand.
Advice
Leave it or put it right?
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Walham Green, the repair is bigger than a sealant job.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we’ll go through it with you.
Why book with us
- More than 20 years in sealant work
- Old sealant always removed completely
- We leave the area clean and tidy
- One-year guarantee on every job
Walham Green: your questions answered
I let a flat near Imperial Wharf station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Can you do sand mastic in Walham Green?
Yes, Walham Green is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear quote.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Can I add another job to the visit?
Of course. Combining jobs makes good use of the visit.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Can I paint the new mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. The old silicone has to come out completely so the mastic beds in well.
How do I get a quote for sand mastic in Walham Green?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or drop us an email and tell us what needs doing and where.