Kent · England
Sand mastic for sash & case windows in Highstead, Kent
Sand mastic across Highstead and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- Old cement repairs round a window that have failed
- Tired mastic found when preparing windows for paint
Keeping the joints in good condition
Aftercare is simple:
- Find out about consent before window work on a listed home
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
- Plan mastic work ahead of painting
Leave the new mastic alone while it firms up. It skins over quickly but needs longer to fully harden.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
How we handle sand mastic in Highstead
Across Highstead, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. If you’re dealing with open joints round the window box and draughts and rain around sash boxes, we can help.
Somewhere as small as Highstead, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
A one-year guarantee comes as standard.
- Place
- Highstead (CT3, CT6)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the quote in Highstead
The quote reflects the job in front of us. We look at:
- Whether the work is at height
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
- How much there is to do
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
What to tell us for a quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- Photos by email, if that is easy
- If someone has resealed it before
- Whether it’s a home or a business
We don’t publish a price list. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or email us.
Highstead questions
Is Highstead within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Herne Bay station?
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 it possible to take out silicone and use sand mastic instead?
Yes. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
When will the new mastic be hard?
It takes a while. The skin forms first, and the full set comes later and we’ll give you an idea for your job.
Should I check with the council before work on a listed or conservation-area home?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Windows and doors in Highstead
Highstead is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. 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.
Rented homes near Herne Bay station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to Church of St Mary the Virgin include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Highstead is about 2 miles south-east of Herne Bay, in Kent. For sand mastic in and around Highstead, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Kent from our Crawley base, Highstead included. 922 places in Kent are on our list, large and small. You can also see our page for Chelmsford, about 40 miles away.
All of CT3 and CT6 is within our area for sand mastic, from the main roads to the quietest streets. We also cover the places around Highstead: Hawthorn (1 mile north), Boyden Gate (1 mile south-east), Millbank (1 mile south-west), Old Tree (1 mile south) and Hillborough (1 mile north). Within a short drive, we also cover Canterbury (7 miles south-west), Margate (9 miles east), Ramsgate (10 miles east), Broadstairs (11 miles east), Whitstable (6 miles west) and Deal (13 miles south-east).
Local landmarks in Highstead
Typical jobs here are in homes near Bishopstone Cliffs and Hog & Donkey pub, among other places. For rail, the closest station is Herne Bay station, roughly 2.7 miles west of the centre. Nearby you’ll also find Whitstable and Tankerton Hospital (5.6 miles west). Open spaces near Highstead include West Blean and Thornden Woods.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Nearby places to Highstead
Other services in Highstead
Why act early in Highstead
New mastic over crumbling mastic will not hold. We remove the loose material first so the new work lasts. Where a wall is exposed, as many are in small places like Highstead, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Why choose Mr Mastic in Highstead
- 180+ five-star Google reviews
- Over 20 years’ experience
- Quality sealants from Arbo and Everbuild
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at how sealant jobs are priced and our reviews.
Common problems we fix in Highstead
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber and we normally remove them.
It’s worth asking for a quote if you see:
- Gaps where the frame meets the masonry
- A silicone bead on a sash window that spoils the look
- Gaps round a timber door in stone or brick
- Old cement repairs round a window that have failed
Managing a site like Reculver Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- Who turns up on the day
- Whether they’re fully insured
- What preparation is included
- The length of the guarantee
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Highstead and across Kent. We can quote a run of properties together, and we are fully insured for the work.
Hotels need rooms back in use, 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.
What happens on the day
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to a full day, depending on how many windows. Somewhere like Highstead needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- 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.
How to prepare
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
Get a quote
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we’ll take it from there.