Kent · England
Chainhurst Sand Mastic
We cover Chainhurst for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Gaps round a timber door in stone or brick
- Gaps between timber frames and stone or brick
- Tired mastic found when preparing windows for paint
What sand mastic looks like in Chainhurst
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Marden station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Chainhurst is about 5 miles south-west of Maidstone, in Kent. Whether you’re in the middle of Chainhurst or further out, we cover sand mastic for every kind of property. Across Kent, we cover 922 places, Chainhurst among them. There’s also a page for Crawley, roughly 30 miles from Chainhurst.
Work in TN12 works the same way as everywhere else we cover. If you need sand mastic at a property on Raynham Villas and Hunton Road or anywhere close by, we can help. Other places close to Chainhurst include Hunton (1 mile north-west), Benover (2 miles north-west), Congelow (2 miles north-west), Coxheath (2 miles north) and Yalding (2 miles north-west). We also work in nearby towns such as Maidstone (5 miles north-east), Sittingbourne (15 miles north-east), Sevenoaks (14 miles north-west), Royal Tunbridge Wells (10 miles south-west), Tonbridge (9 miles west) and Kings Hill (6 miles north-west).
Near you in Chainhurst
Chainhurst’s nearest station is Marden station, roughly 2 miles south of the centre. A little further out are South East Romany Museum (2.6 miles south-east) and Oakwood Hospital (4.6 miles north).
How we handle sand mastic in Chainhurst
Sand mastic suits most period window surrounds. Newer frames usually get a flexible sealant instead and we will explain which is best for yours. We are often asked to deal with patchy fillers round a sash window and mastic round period door frames that has failed, across tenement windows, stone surrounds and timber door frames.
Somewhere as small as Chainhurst, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Chainhurst (TN12)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We also work for property managers and facilities teams in Chainhurst and across Kent. We can quote a run of properties together, and we are fully insured.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Ask the planning authority about consent for listed or conservation-area homes
- Don’t run silicone over sand mastic
- Leave the new mastic unpainted
- Check the mastic when you check the paintwork
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Also in Chainhurst
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
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, and the work is guaranteed for a year.
When to call us in Chainhurst
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber and we normally remove them.
If you can see any of these, it’s time to have the joints looked at:
- Gaps round a timber door in stone or brick
- Silicone on a period window that looks wrong
- Tired mastic found when preparing windows for paint
- Gaps between timber frames and stone or brick
Around Chainhurst, as everywhere, sand mastic is only as good as the preparation behind it.
Questions to ask before you book
- How much experience the applicator has
- Whether they seal over old material or remove it
- What preparation is included
- What the cure time is
How the visit works
Before we leave, we go over the finished joints with you. The visit itself usually takes anything from a few hours to a full day, depending on how many windows, depending on the amount of work. Somewhere as small as Chainhurst, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
We quote each job on its own. Simply call 0345 464 0079 or drop us an email and describe the job.
Read more
Questions from Chainhurst
Is Chainhurst within the area you cover?
Yes, Chainhurst is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you do sand mastic in Chainhurst?
Yes, Chainhurst is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Can tenants book the work?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
What exactly is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
Is the work guaranteed?
You get our one-year guarantee on every job.
Do you offer different sealant colours?
Most of the time, yes. We will tell you which colours the right product comes in.
When will the new mastic be hard?
It takes a while. The skin forms first, and the full set comes later, and we’ll tell you what to expect.
When something else is needed
We’ll always be straight with you, so here’s what new sealant won’t do:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Broken panes
- Damaged stone surrounds
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Where we work in Chainhurst
- Period & listed homes
- Timber door frames
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows
Quotes for sand mastic in Chainhurst
For a quick quote, just ask. What matters most is:
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- The product the joint needs
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Helping us quote
There’s no need for technical detail. Just tell us:
- If it’s domestic, commercial or a hotel
- Photos by email, if that’s easy
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
Getting a quote is simple: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we’ll take it from there.