Kent · England
Window Mastic in Leybourne
Mastic around window and door frames, sills and patio doors for Leybourne, backed by a one-year guarantee. Ask us for a quote.
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
- Mastic that’s falling out in pieces
How we handle window mastic in Leybourne
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. We’re often asked to deal with mastic that’s falling out in pieces and rain getting in at the frame or under the sill, across uPVC windows, patio & French doors and window sills.
Somewhere as small as Leybourne, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Leybourne (ME19, ME20)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Different surfaces, different methods
Aluminium frames
Coated aluminium needs a compatible sealant and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We will tell you if that is what we find.
Other services in Leybourne
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Leybourne: your questions answered
Will you come out to Leybourne?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you cover Leybourne for window mastic?
Yes, Leybourne is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Can you get sealant to suit coloured frames?
Yes, in most cases. Tell us the frame colour when you get in touch and we’ll use the nearest match.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Can you do upstairs windows?
Normally, yes. We plan safe access before the job, so mention the height and anything in the way.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Does the work come with a guarantee?
Yes, with our 12-month guarantee. Keeping drainage clear and checking the joints yearly helps them last.
How the visit works
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a handful of frames, longer for a whole house. For a village or hamlet like Leybourne, 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.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, call 0345 464 0079 or email us.
Related advice
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
For anyone letting property in or around Leybourne, several properties can be quoted together. Send us the addresses and the work at each, and photos by email help.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Repaint timber before it’s bare
- Paint up to the joint, not over it
- Avoid blasting the frames with a pressure washer
- Avoid harsh chemicals near the mastic
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. Resealing closes it.
Frames and glazing around Leybourne
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Starkey Castle (about 4.5 miles north) nearby, there’s older building stock in the area around Leybourne as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as Church of St Peter and St Paul, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Schools such as Lunsford Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. If you let a flat or house near West Malling station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Leybourne is about 5 miles north-west of Maidstone, in Kent. Every kind of property in Leybourne is covered for window mastic, old or new, large or small. The work is guaranteed for a year. 922 places in Kent are on our list, from the larger towns to small villages. You can also see our page for London, roughly 26 miles from Leybourne.
All of ME19 and ME20 is covered for window mastic, from the main roads to the quietest streets. Window mastic is available to properties on London Road, Oxley Shaw Lane and Redbank and the roads around them. We also cover Larkfield (1 mile east), Lunsford (1 mile north-east), New Hythe (1 mile north-east), Birling (1 mile north-west) and Snodland (2 miles north). Further out, we also cover Maidstone (5 miles south-east), Sittingbourne (14 miles east), Dartford (13 miles north-west), Sevenoaks (10 miles west), Royal Tunbridge Wells (13 miles south-west) and Gravesend (9 miles north).
Local landmarks in Leybourne
Locally, jobs take us to homes and businesses close to The Malling School, Leybourne Lakes Country Park and The Malling School, among other places. For rail, the closest station is West Malling station, about 0.7 miles south-west. A little further out are Leybourne Castle (less than half a mile north-west) and Coldrum Long Barrow (2.7 miles north-west). Not far away are Burham Down and Blue Bell Hill.
Why act early in Leybourne
Draughts and leaks do not always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we’ll say so. Older cottages and farmhouses around Leybourne can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Why book with us
- Fully insured
- We leave the area clean and tidy
- Colour agreed with you before any work starts
- Arbo and Everbuild products
Take a look at our cost guide or customer reviews.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Rotten timber, which needs a joiner first
- Damp problems in the wall away from the window
- Misting between the panes of a double-glazed unit (that needs a new unit)
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Window sills
- uPVC windows
- Aluminium frames
- Patio & French doors
- Composite doors
- Timber windows & doors