Kent · England
Sand mastic for sash & case windows in Leigh, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Leigh, with a one-year guarantee on every job. Call for a quick quote.
- Modern sealant on a period surround
- Mastic that needs renewing before redecorating
- Failed mastic on an exposed elevation
How we handle sand mastic in Leigh
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap and tidies the surround. We work on sash and case windows, period & listed homes and timber door frames, and the jobs we see most are gaps between timber frames and stone or brick and silicone on a period window that looks wrong.
Outdoor sealant needs dry, clean surfaces, so work on frames around Leigh is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
All our work comes with our 12-month guarantee.
- Place
- Leigh (TN11)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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 sand mastic looks like in Leigh
With historic houses such as Penshurst Place (about 2 miles south-west) nearby, there’s older building stock in the area around Leigh as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as St Mary's Church, the joint between an old wall and a newer frame is generally the first place rain gets in. If you look after a building such as Leigh Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Leigh is about 3 miles west of Tonbridge, in Kent. We provide sand mastic to householders, landlords and businesses in Leigh and the surrounding area, as part of our work across Kent. Our Kent coverage runs to 922 places, Leigh among them. There’s also a page for Crawley, about 19 miles away.
Here we cover the TN11 postcode area for sand mastic. Streets in the area include High Street, Green View Avenue and The Green. Nearby, we also carry out sand mastic in Lower Haysden (1 mile east), Printstile (2 miles south), Bidborough (2 miles south-east), Tonbridge (3 miles east) and Stockland Green (3 miles south). Within a short drive, we also cover Maidstone (14 miles east), Sevenoaks (6 miles north), Royal Tunbridge Wells (5 miles south-east), Swanley (14 miles north), Kings Hill (10 miles north-east) and Foley Park (15 miles north-east).
Near you in Leigh
Typical jobs here are in homes near Haysden Country Park, Fleur De Lis Cottages Fleur De Lis Public House and The Judd School, among other places. Leigh has its own railway station: Leigh (Kent) station. Well-known places in the area include Tonbridge Cottage Hospital (2.7 miles south-east) and The Milne Museum (2.4 miles east). For a walk, there’s Tudeley Woods RSPB reserve and Barden Lake.
Quotes for sand mastic in Leigh
Your quote is based on your job. We take into account:
- Mould in or behind the old joints
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- The size of the job
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, and we’ll explain the quote if you ask.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- The problem you’ve noticed
- Access, such as stairs, a lift or height
- The address or postcode of the job
- Roughly how big the job is
For sand mastic in Leigh, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Common problems we fix in Leigh
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
People usually contact us when they notice something like this:
- Silicone on a period window that looks wrong
- Crumbling sand mastic round a window
- Open joints round the window box
- Wind and rain getting in round a sash window
If you let a flat or house near Leigh (Kent) station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before booking
- The length of the guarantee
- What insurance they hold
- What happens if they find a problem under the old sealant
- What preparation is included
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Decayed frames that need repair
- Whether work needs listed building consent
- Sash cords, weights and draught-proofing of the sashes
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before you book.
What we seal
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Brick reveals
- Timber door frames
- Tenement windows
Questions from Leigh
Do you cover Leigh for sand mastic?
Yes, Leigh is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Do you cover smaller places like Leigh?
Yes. Leigh is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
What guarantee comes with the work?
Every job comes with our one-year guarantee, and we’re fully insured.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is normally more efficient.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will advise.
Should I check with the council before work on a listed or conservation-area home?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that generally means someone at home.
How to look after the new joints
To keep the joints looking good and working properly:
- Clear gutters so water doesn’t pour onto the windows
- Inspect the joints round the windows every year or so
- Don’t paint over the new mastic
- Have rotten timber repaired before new mastic goes in
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Other services in Leigh
Landlord and commercial work in Leigh
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
If you manage several properties in or around Leigh, several properties can be quoted together. Send us the addresses and the work at each.
How the visit works
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes a few hours for a single window, longer for several from start to finish. In a small place like Leigh, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Mention any sign-in or site rules at work premises
- Let us know about earlier repairs to the joints
Getting a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or email us.