Kent · England
Sand mastic for sash & case windows in Dunton Green, Kent
Our applicators work in Dunton Green on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Mastic worn away on windows facing the weather
- Old sand mastic that has cracked, crumbled or fallen out
- Wind and rain getting in round a sash window
Questions from Dunton Green
Is Dunton Green within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Dunton Green station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Is sand mastic better than silicone for my windows?
That depends on your windows. Period windows in stone or brick usually suit sand mastic, while modern frames normally get a flexible sealant.
Can I add another job to the visit?
Of course. Combining jobs makes good use of the visit.
How long does sand mastic take?
It depends on the size of the job, but as a guide it takes anything from a few hours to a full day, depending on how many windows. We will give you a better idea when we quote.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They’ll tell you if consent is needed for work to your windows.
Sand mastic in Dunton Green
A silicone bead around a sash window can look out of place and is not always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. If you are dealing with cracked mastic round a front door frame and old sand mastic that has cracked, crumbled or fallen out, we can put it right, on period & listed homes, tenement windows and sash and case windows alike.
Around Dunton Green, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Dunton Green (TN13, TN14)
- Wider area
- Kent
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What we are called out for in Dunton Green
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Look out for any of the following:
- Draughty sash windows at the surround
- Mastic round period door frames that has failed
- Cement or filler used on old window joints that has cracked
- Weathered mastic on the most exposed windows
For site and facilities teams at buildings such as Dunton Green Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Before you book anyone
- What guarantee comes with the work
- What happens if they find a problem under the old sealant
- What preparation is included
- Whether they’re fully insured
Towns and villages near Dunton Green
Also in Dunton Green
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Decayed frames that need repair
- Sashes that need overhauling
- Planning or listed building consent (your local planning authority decides)
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Timber door frames
- Stone surrounds
- Brick reveals
- Tenement windows
- Sash and case windows
- Period & listed homes
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Frames and glazing around Dunton Green
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Knole House (about 2.5 miles south-east) are a reminder that the area around Dunton Green has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to St John's Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in. For landlords with property near Dunton Green station, any sash windows need sound mastic to keep draughts and rain out.
Dunton Green is about 1 mile north-west of Sevenoaks, in Kent. Anywhere in TN13, we cover sand mastic for homes and businesses. 922 places in Kent are on our list, large and small. For nearby work, see our London page (18 miles or so).
Here we cover the TN13 and TN14 postcode area for sand mastic. Whether your property is on Station Road, Campion Square and London Road or anywhere close by, our applicators can take on the job. We also cover Riverhead (1 mile south), Chipstead (1 mile south-west), Bessels Green (1 mile south-west), Sevenoaks (1 mile south-east) and Chevening (2 miles west). We also work in nearby towns such as Dartford (11 miles north), Royal Tunbridge Wells (12 miles south), Gravesend (13 miles north-east), Tonbridge (8 miles south-east), Northfleet (12 miles north-east) and Swanley (7 miles north).
Near you in Dunton Green
Locally, jobs take us to homes and businesses close to Montreal Park, The Miners Arms and Trinity School, among other places. Dunton Green has its own railway station: Dunton Green station. A little further out are Otford Heritage Centre (1.5 miles north-east) and Kemsing Castle Bank (2.8 miles east). Green spaces nearby include Dryhill Nature Reserve and Betsom's Hill.
Different surfaces, different methods
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we will confirm access.
Stone surrounds
The stone is treated with care when the old mastic comes out.
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Dunton Green, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
- Move anything stored near the joints
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Read more
Why act early in Dunton Green
If you are redecorating, renew the mastic first. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. Older cottages and farmhouses around Dunton Green can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why Dunton Green customers choose us
- More than 20 years in sealant work
- 180+ five-star Google reviews
- Homes, businesses and hotels
- We are fully insured
See our cost guide or our reviews.
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Ask us before painting near the mastic
- Do not run silicone over sand mastic
- Look over the window mastic once a year
- Check with your local planning authority if your home is listed
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.