Kent · England
Sand Mastic in Platt's Heath
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Platt's Heath. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cement or filler used on old window joints that has cracked
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
Why act early in Platt's Heath
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall, so dealing with it now protects both. Around Platt's Heath, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start.
What you get with us
- Old sealant always removed completely
- We are fully insured
- 20+ years of sealant experience
- Anti-fungal silicone where joints get wet
See what affects the cost and what customers say.
Sand mastic for homes and businesses in Platt's Heath
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. Common call-outs are for old cement repairs round a window that have failed and old sand mastic that has cracked, crumbled or fallen out, across tenement windows, sash and case windows and period & listed homes.
Outdoor sealant needs dry, clean surfaces, so work on frames around Platt's Heath is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
All of our work is guaranteed for twelve months, in Platt's Heath and everywhere else we cover.
- Where
- Platt's Heath (ME17)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Common questions in Platt's Heath
Is Platt's Heath within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
I let a flat near Lenham station. Can you help?
Yes. We work for letting agents and landlords as well as householders. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
How long does sand mastic take to harden?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They’ll tell you if consent is needed for work to your windows.
Are you fully insured?
Yes. We’re fully insured.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Platt's Heath and the rest of Kent, along with the rest of our area.
Landlord and commercial work in Platt's Heath
In hotels, rooms out of use cost money, 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.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Quotes for sand mastic in Platt's Heath
You’ll get a clear quote before work begins. It takes into account:
- Any working-time requirements on site
- How many areas need sealing
- Whether there’s mould to deal with
- The product the joint needs
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- The address or postcode of the job
- Photos by email, if that’s easy
- Any previous sealing or DIY work
- Any access issues, like height or stairs
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’ll talk you through the work.
Sand mastic in Platt's Heath: local notes
Historic houses like Leeds Castle (about 3 miles north-west) are a reminder that the area around Platt's Heath has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Platts Heath Primary School, its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near Church of St Nicholas, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Platt's Heath is about 7 miles south-east of Maidstone, in Kent. Jobs in Platt's Heath get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Across Kent, we cover 922 places, Platt's Heath among them. Our Chelmsford page covers work nearby.
Every address in ME17 is covered for sand mastic. Whether your property is on School Lane, Headcorn Road and Green Lane or a nearby road, we can help. Nearby, we also carry out sand mastic in Liverton Street (1 mile south-west), Sandway (1 mile north-east), Boughton Malherbe (1 mile south-east), Fairbourne Heath (1 mile west) and Grafty Green (1 mile south). We also work in nearby towns such as Maidstone (7 miles north-west), Ashford (10 miles south-east), Sittingbourne (9 miles north), Faversham (11 miles north-east), Minster (14 miles north) and Kings Hill (13 miles west).
Landmarks near Platt's Heath
Typical jobs here are in homes near Kiln Wood, Wishful Thinker pub and The Lenham School, among other places. The closest station to Platt's Heath is Lenham station, roughly 1.2 miles north-east of the centre. Well-known places in the area include The Dog Collar Museum (2.9 miles north-west) and Coldbridge Castle (1.8 miles south).
What the job involves on each surface
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
The process
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 Platt's Heath needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention if the joints have been sealed before
- Tell us about access, such as stairs, a lift or high-level joints
- Clear the area around the work
Ask for a quote
We quote each job on its own. Simply ring 0345 464 0079 or email us and describe the job.
Advice
Places near Platt's Heath
What else we do in Platt's Heath
When to call us in Platt's Heath
Shallow joints are a common cause. A thin layer doesn’t hold well so we make sure the new mastic is the right thickness.
Keep an eye out for these signs:
- Failed mastic on an exposed elevation
- Open joints round the window box
- Mastic that needs renewing before redecorating
- Silicone on a period window that looks wrong
For landlords with property near Lenham station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Comparing quotes
- What insurance they hold
- Which colour the sealant will be
- The length of the guarantee
- What product goes in the joint
DIY sealant or a professional job?
The difference is mostly in the preparation and the 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.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.