Buckinghamshire · England
Window Mastic in Dunton
Window mastic across Dunton and nearby, with old sealant always removed completely.
- Hard, cracked sealant around windows
- Leaking joints at the ends of sills
- Mastic that is falling out in pieces
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Keep timber frames painted
- Keep jet washers away from the mastic
- Use gentle cleaners on frames and sealant
- Don’t paint over the silicone
Keep the new mastic undisturbed while it cures, following the cure time we give you. Do not point a pressure washer at the joints.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and a cold room gets colder. Resealing closes it.
Window mastic for homes and businesses in Dunton
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. 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 composite doors, aluminium frames and patio & French doors.
Homes in small places like Dunton often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Every job comes with our one-year guarantee, wherever you are in Buckinghamshire.
- Where
- Dunton (MK18)
- Region
- Buckinghamshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Composite doors
Front doors take the weather head on, and the top and bottom corners tend to fail first. We pay most attention there.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal. Neutral-cure sealant is the safe choice.
Dunton questions
Is Dunton within the area you cover?
Yes. Dunton 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.
Do you cover Dunton for window mastic?
Yes, Dunton is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply phone 0345 464 0079 or email us.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Dunton.
Can you do upstairs windows?
Yes, in most cases. Access is planned before we start.
Towns and villages near Dunton
Also in Dunton
For landlords and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
How it works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take anything from an hour or two to a full day, depending on how many frames there are. Somewhere as small as Dunton, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- Clear the area around the work
- Keep children and pets away from the work area
- Mention any parking rules near the property
Getting a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Advice
When to call us in Dunton
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. When that sealant fails, water gets into the wall or under the frame.
Look out for these signs:
- Gaps where the sill meets the wall
- Mastic that is falling out in pieces
- Mastic that has split away from the wall
- Draughty joints inside around the window
In and around Dunton, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Comparing quotes
- Is the old sealant removed completely?
- What preparation is included
- What insurance they hold
- What happens if they find a problem under the old sealant
What affects the cost of window mastic
The quote reflects the job in front of us. We take into account:
- When we can work, for business premises
- Any mould that needs treating
- How much there is to do
- How much old sealant there is and how hard it is to remove
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
Helping us quote
When you contact us, these details help:
- Any access issues, like height or stairs
- Whether it’s a home or a business
- Where the property is
- Whether it has been sealed before
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
DIY versus a professional 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 matched to the joint and its conditions.
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 doesn’t work out, we can still put it right.
Dunton homes and the weather
With historic houses such as Ascott House (about 4.4 miles east) nearby, there’s older building stock in the area around Dunton as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Homes close to Church of St Martin include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Dunton is about 6 miles north of Aylesbury, in Buckinghamshire. Every kind of property in Dunton can book us for window mastic, old or new, large or small. The work is guaranteed for a year. We cover 263 towns and villages across Buckinghamshire, large and small. Oxford is on our list too, around 21 miles away.
Postcode districts we cover here for window mastic: MK18. Neighbouring places we cover for window mastic include Swanbourne (2 miles north-west), Mursley (3 miles north), Granborough (3 miles west), Winslow (4 miles north-west) and Little Horwood (4 miles north). We also work in nearby towns such as Aylesbury (6 miles south), Buckingham (10 miles north-west), Elmhurst (6 miles south), Southcourt (7 miles south), Princes Risborough (13 miles south) and Haydon Hill (6 miles south).
What’s near Dunton
Other landmarks nearby include Tindal Centre (6 miles south) and Bolbec Castle (2.5 miles south-west).