Kent · England
Sand mastic for sash & case windows in Millbank, Kent
We cover Millbank for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Patchy fillers round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps where the frame meets the masonry
For landlords and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Landlords and agents in Millbank can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
How we handle sand mastic in Millbank
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We work on sash and case windows, brick reveals and stone surrounds, and common reasons people get in touch are gaps where the frame meets the masonry and weathered mastic on the most exposed windows.
Around Millbank, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
There’s a 12-month guarantee on every job.
- Location
- Millbank (CT3)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Ask the planning authority about consent for listed or conservation-area homes
- Avoid patching sand mastic with silicone
- Go gently near the mastic when preparing windows
- Make sure water runs off the sill
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
The process
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a single window, longer for several in most cases. Somewhere as small as Millbank, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we are working on
Get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved.
Advice
Millbank homes and the weather
Millbank is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. 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.
Letting a property close to Herne Bay station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. For an older house near a landmark such as Church of the Holy Cross, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Millbank is about 2 miles south-east of Herne Bay, in Kent. Across the CT3 area, we cover sand mastic for homes and businesses. Our Kent coverage runs to 922 places, and Millbank is one of them. For nearby work, see our Chelmsford page, about 40 miles away.
Postcode districts we cover here for sand mastic: CT3. Nearby, we also carry out sand mastic in Maypole (1 mile south), Old Tree (1 mile south-east), Highstead (1 mile north-east), Hoath (1 mile south) and Knave's Ash (1 mile south-west). Within a short drive, we also cover Canterbury (6 miles south-west), Margate (10 miles east), Dover (15 miles south), Ramsgate (11 miles east), Broadstairs (12 miles east) and Whitstable (6 miles west).
What’s near Millbank
Around Millbank, our work takes us to homes and buildings near Spires Academy, Curtis Wood and The Huntsman And Horn Public House. The nearest railway station is Herne Bay station, roughly 2.4 miles north-west of the centre. A little further out are Whitstable and Tankerton Hospital (5 miles west). Not far away are West Blean and Thornden Woods.
When something else is needed
We’ll always be straight with you, so here’s what new sealant won’t do:
- Sashes that rattle, stick or will not open
- Decayed frames that need repair
- Putty and glazing repairs
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before you book.
Joints and surfaces we work on
- Sash and case windows
- Stone surrounds
- Timber door frames
- Tenement windows
- Period & listed homes
- Brick reveals
What happens if it’s left?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. Where a wall is exposed, as many are in small places like Millbank, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and give you a clear price before any work starts.
Why Millbank customers choose us
- Rated 4.9 stars on Google
- We are fully insured
- 12-month guarantee on every job
- Neat joints and a tidy finish
Read what affects the cost and customer reviews.
Nearby places to Millbank
What else we do in Millbank
When to call us in Millbank
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint.
The problems people generally mention when they call are:
- A silicone bead on a sash window that spoils the look
- Cracked mastic round a front door frame
- Window mastic to renew ahead of painting
- Weathered mastic on the most exposed windows
Managing a site like Hoath Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Before you book anyone
- What guarantee comes with the work
- Is VAT in the price?
- Which colour the sealant will be
- Whether the sealant suits the joint
Surface by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Questions from Millbank
Will you come out to Millbank?
Yes, Millbank is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Is sand mastic in a coastal place like Millbank any different?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
How long will you be here?
Typically it takes anything from a few hours to a full day, depending on how many windows. Larger jobs naturally take longer.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.