Kent · England
Platt's Heath Window Mastic
Mastic around window and door frames, sills and patio doors for homes and businesses in Platt's Heath and across Kent. Fully insured, ARBOMaster approved and guaranteed for a year.
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Leaking joints at the ends of sills
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Window mastic in Platt's Heath, done properly
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. We work on patio & French doors, uPVC windows and aluminium frames, and people most often call us about leaking joints at the ends of sills and gaps between the frame and the inside reveal.
In a village or hamlet like Platt's Heath, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Platt's Heath (ME17)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Timber windows & doors
Timber moves with moisture as well as heat, so the joint must stay flexible. We seal onto sound, dry paintwork or timber.
Landlords, agents and businesses in Platt's Heath
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Wash the frames with mild soapy water
- Keep paint off silicone joints
- Keep paint and stain on wooden frames in good order
- Do not use solvent cleaners on the joint
Timber frames need their paint kept up, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
What sealant work can’t fix
In fairness, there are a few things sealant won’t fix:
- Rotten timber, which needs a joiner first
- Condensation trapped between the panes
- A sash or casement that will not close properly
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Window sills
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Composite doors
- Patio & French doors
FAQs for Platt's Heath
Can you do window mastic in Platt's Heath?
Yes, Platt's Heath is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Do you work for landlords with property near Lenham station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
How do I get a quote for window mastic in Platt's Heath?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we’ll talk you through it.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We will tell you what we’re using and why.
Can new window sealant be painted?
Not generally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
What window mastic looks like in Platt's Heath
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Leeds Castle (about 3 miles north-west) nearby, there’s older building stock in the area around Platt's Heath as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you let a flat or house near Lenham station, renewing tired window mastic between tenants heads off draught and damp complaints. If you look after a building such as Platts Heath Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as 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. We provide window mastic to homes and businesses in Platt's Heath and the surrounding area, as part of our work across Kent. We cover 922 towns and villages across Kent, large and small. Our Chelmsford page covers work nearby (37 miles or so).
All of ME17 is within our area for window mastic. Whether your property is on School Lane, Headcorn Road and Green Lane or a nearby road, our applicators can take on the job. Close by, we work 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). Larger places within reach include 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).
What’s near Platt's Heath
We work in homes and buildings around Kiln Wood, Wishful Thinker pub and The Lenham School and the streets around them. Platt's Heath’s nearest station is Lenham station, roughly 1.2 miles north-east. Other landmarks nearby include The Dog Collar Museum (2.9 miles north-west) and Coldbridge Castle (1.8 miles south).
What affects the cost of window mastic
We quote each job individually. These are the things that affect it:
- The amount of work
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- Working hours on commercial sites
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- Whether it has been sealed before
- How we’d reach the joints
- A few pictures by email, if you can
- Roughly how big the job is
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
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What we do, step by step
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. Expect the work to take most of a day for a typical house, less for a few frames, and we tell you how long to leave it before we go. For a village or hamlet like Platt's Heath, the journey is planned in advance: 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 go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
- Mention any leaks or damp you’ve noticed
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.