Kent · England
Sand mastic for sash & case windows in Herne, Kent
Professional sand mastic in and around Herne, with every bit of old sealant taken out first.
- Open joints round the window box
- Crumbling sand mastic round a window
- Draughty sash windows at the surround
Questions from Herne
I let a flat near Herne Bay station. Can you help?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Does the coastal weather in Herne affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are generally the first to need attention.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
What does sand mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
What is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Can you match the sealant colour?
Most of the time, yes. We’ll explain which colours are available and agree one before we start.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Sand mastic in Herne
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. Typical jobs include silicone on a period window that looks wrong and gaps between timber frames and stone or brick, across timber door frames, stone surrounds and brick reveals.
Many houses in smaller places like Herne have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
All of our work is guaranteed for twelve months, in Herne and everywhere else we cover.
- Place
- Herne (CT6)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Quotes for sand mastic in Herne
Jobs vary more than people expect. What affects the quote:
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- The type of sealant required
- How much there is to do
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
What to tell us for a quote
To make quoting easier, let us know:
- The type of property
- How many joints, rooms or windows are involved
- Whether it has been sealed before
- Where the job is, and your postcode
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before work begins.
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Check with your local planning authority if your home is listed
- Avoid patching sand mastic with silicone
- Sort the mastic before the decorators arrive
- Ask a joiner to look at soft timber first
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
Sand mastic in Herne: local notes
Herne is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Church of St Martin, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you look after a building such as Herne Church of England Infant School, its window and door frames need their mastic kept sound, just like a home’s.
Herne is about 1 mile south of Herne Bay, in Kent. Whether you are in the middle of Herne or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Herne is one of 922 towns and villages in Kent where we work. You can also see our page for Chelmsford, about 39 miles away.
We cover every part of CT6 for sand mastic. That includes homes and businesses on St Martin's View, Ridley Close and Herne Street and the roads around them. We also cover Hunters Forstal (1 mile north-east), Eddington (1 mile north-west), Herne Common (1 mile south-west), Bullockstone (1 mile west) and Broomfield (1 mile north-east). Larger places within reach include Canterbury (5 miles south-west), Margate (11 miles east), Ramsgate (12 miles east), Broadstairs (13 miles east), Whitstable (4 miles west) and Deal (15 miles south-east).
Around Herne
In Herne, that means homes and buildings near Curtis Wood and Herne Bay High School and the streets around them. The nearest railway station is Herne Bay station, roughly 1.2 miles north-west. A little further out are Whitstable and Tankerton Hospital (3.7 miles west) and Tankerton Castle (4.4 miles west). The countryside around Herne includes West Blean and Thornden Woods.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Broken panes
- Planning or listed building consent (your local planning authority decides)
- Rotten sashes, sills or window boxes (a joiner’s job)
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Where we work in Herne
- Sash and case windows
- Tenement windows
- Stone surrounds
- Timber door frames
- Period & listed homes
- Brick reveals
Places near Herne
Also in Herne
What happens if it’s left?
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new mastic stays put. In a smaller place like Herne, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why book with us
- Over 20 years’ experience
- We leave the area clean and tidy
- Anti-fungal silicone where joints get wet
- Experience in homes, commercial sites and hotels
See what affects the cost and customer reviews.
What we do, step by step
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 a few hours for a single window, longer for several. For a job in Herne, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Let us know about parking restrictions
- For indoor joints, keep the area dry beforehand if you can
- Keep pets and children clear of the area while we work
Getting a quote
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details and send photos if you have them.
Advice
Common problems we fix in Herne
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
People usually contact us after spotting one of these:
- Old sand mastic that has cracked, crumbled or fallen out
- Wind and rain getting in round a sash window
- A silicone bead on a sash window that spoils the look
- Open joints round the window box
Rented homes near Herne Bay station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- What preparation is included
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
- What guarantee comes with the work