Kent · England
Hareplain Sand Mastic
Problem with your window and door surrounds in Hareplain? We cut out the old, prepare the joints and apply the right sealant.
- Weathered mastic on the most exposed windows
- Old cement repairs round a window that have failed
- Cracked mastic round a front door frame
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Go gently near the mastic when preparing windows
- Don’t run silicone over sand mastic
- Clear gutters so water does not pour onto the windows
- Check the mastic when you check the paintwork
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
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.
About our sand mastic in Hareplain
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it and we will advise if you are redecorating. If you are dealing with gaps where the frame meets the masonry and cement or filler used on old window joints that has cracked, we can help, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Hareplain is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
You’re covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Where
- Hareplain (TN27)
- Region
- Kent
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Hareplain questions
Can you do sand mastic in Hareplain?
Yes. Our work covers London and the South East, and Hareplain is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Do you cover smaller places like Hareplain?
Yes. Hareplain is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Where are you based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How long does sand mastic take to harden?
It takes a while. It skins first and hardens fully 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?
Check with your local planning authority. They decide whether consent is needed.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s applied by hand and finished to sit neatly against the masonry.
How the visit works
There’s no need to move everything out, just the space around the work. Everything nearby is protected, and the work takes a few hours per window, depending on the condition of the joints for a typical job. Somewhere as small as Hareplain, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Mention if the joints have been sealed before
- Clear items away from the joints we’re working on
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or email us and describe the job, and photos are welcome.
Advice
What affects the cost of sand mastic
Every job gets its own quote. This is what makes a difference:
- The amount of work
- Mould in or behind the old joints
- How many areas need sealing
- The product the joint needs
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Helping us quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
Want a quote for sand mastic? Please ring 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
What sand mastic looks like in Hareplain
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Hareplain, as everywhere, sand mastic is only as good as the preparation behind it. Letting a property close to Headcorn station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Hareplain is about 10 miles south of Maidstone, in Kent. Every kind of property in Hareplain is covered for sand mastic. Every job comes with our one-year guarantee. Hareplain is one of 922 places in Kent we cover. Crawley is on our list too, about 35 miles from Hareplain.
All of TN27 is covered for sand mastic, from the main roads to the quietest streets. Neighbouring places we cover for sand mastic include Three Chimneys (1 mile south-west), Biddenden (1 mile south-east), Curteis' Corner (1 mile east), Lashenden (2 miles north-east) and Standen (2 miles east). Further out, we also cover Maidstone (10 miles north), Ashford (11 miles east), Royal Tunbridge Wells (15 miles west), Tonbridge (15 miles west), Kings Hill (14 miles north-west) and Foley Park (11 miles north).
Around Hareplain
Locally, jobs take us to homes and businesses close to Three Chimneys Public House, among other places. For rail, the closest station is Headcorn station, about 2.8 miles north of the centre. Well-known places in the area include Kent Firefighting Museum (0.8 miles north) and Sissinghurst Castle (1.7 miles south-west).
When something else is needed
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Decayed frames that need repair
- Putty and glazing repairs
- Damaged stone surrounds
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Where we work in Hareplain
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Tenement windows
- Timber door frames
- Brick reveals
Places near Hareplain
Other services in Hareplain
Different surfaces, different methods
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
For landlords and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.