Kent · England
Dunton Green Window Mastic
Window mastic for Dunton Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Damp patches on the reveal after heavy rain
- Gaps where the sill meets the wall
- A bead that does not match the frame
How we handle window mastic in Dunton Green
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on window sills, patio & French doors and uPVC windows, and the jobs we see most are draughts coming in around windows and doors and cracked or shrunken mastic around the frame.
Outdoor sealant needs dry, clean surfaces, so work on frames around Dunton Green is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Big or small, it’s backed by our one-year guarantee.
- Location
- Dunton Green (TN13, TN14)
- Wider area
- Kent
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
Sealant isn’t the answer to every problem, and we’ll tell you before we start. Sealant won’t put right:
- Soft or decayed wood in the frame
- Damp problems in the wall away from the window
- A sash or casement that will not close properly
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Aluminium frames
- Window sills
- Composite doors
- uPVC windows
- Timber windows & doors
- Patio & French doors
Towns and villages near Dunton Green
More services for Dunton Green
Window mastic in Dunton Green: local notes
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. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
If you let a flat or house near Dunton Green station, renewing tired window mastic between tenants heads off draught and damp complaints. Schools such as Dunton Green Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. In the older streets around St John's Church, the joint between an old wall and a newer frame is normally the first place rain gets in.
Dunton Green is about 1 mile north-west of Sevenoaks, in Kent. Homes, rented property, offices and hotels in Dunton Green is covered for window mastic, old or new, large or small. Every job comes with our one-year guarantee. We cover 922 towns and villages across Kent, from the larger towns to small villages. Our London page covers work nearby, about 18 miles away.
We work across the TN13 and TN14 postcode area for window mastic and the streets around it. You’ll find streets such as Station Road, Campion Square and London Road. Other places close to Dunton Green include 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). Larger places within reach include 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).
Around Dunton Green
We work in homes and buildings around Montreal Park, The Miners Arms and Trinity School. There’s a railway station in Dunton Green itself: Dunton Green station. A little further out are Otford Heritage Centre (1.5 miles north-east) and Kemsing Castle Bank (2.8 miles east). Open spaces near Dunton Green include Dryhill Nature Reserve and Betsom's Hill.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Paint up to the joint, not over it
- Check the mastic once a year
- Avoid blasting the frames with a pressure washer
- Avoid harsh chemicals near the mastic
A yearly look round the frames is enough. Small splits are simple to catch before they leak.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Dunton Green: your questions answered
Can you do window mastic in Dunton Green?
Yes, Dunton Green is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Dunton Green?
Yes, Dunton Green is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you have sealant for grey or black windows?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames normally suit brown.
What do you need from me for a quote?
A short description and the location. We will ask anything else we need to know.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Do you have insurance?
Yes, we’re fully insured.
Does the work come with a guarantee?
Yes. All our work carries a 12-month guarantee, and we’re fully insured.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that normally means someone at home.
What affects the quote in Dunton Green
For a quick quote, just ask. The main things that affect it are:
- How much old sealant there is and how hard it is to remove
- The amount of work
- Whether there’s mould to deal with
- Access and height
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or email us and we will give you an honest view and a quote.
What we need to know
Before you ask for a quote, have a think about:
- If someone has resealed it before
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
If you’re in Dunton Green and need window mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before we start.
How the job changes by surface
Composite doors
Draughts round the door leaf normally come from worn seals or adjustment, not the mastic. We’ll tell you if that is what we find.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
Landlords, agents and businesses in Dunton Green
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
What we do, step by step
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes a morning for a couple of windows and a door from start to finish. In a small place like Dunton Green, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
Get a quote
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job.