Buckinghamshire · England
Dunton Sand Mastic
Sand mastic for Dunton, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Crumbling sand mastic round a window
- Mastic that needs renewing before redecorating
- Old cement repairs round a window that have failed
Sand mastic in Dunton, done properly
A silicone bead around a sash window can look out of place and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We are often asked to deal with draughts and rain around sash boxes and patchy fillers round a sash window, across stone surrounds, timber door frames and tenement windows.
Somewhere as small as Dunton, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
Big or small, you get the same 12-month guarantee.
- Location
- Dunton (MK18)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
On the day, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. The work usually takes a few hours per window, depending on the condition of the joints. For a village or hamlet like Dunton, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work.
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When it is not the sealant
A few problems are outside what sealant work can do:
- Sash cords, weights and draught-proofing of the sashes
- Decisions on consent for listed homes
- Crumbling stone or brickwork round the window
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before booking.
What we seal
- Tenement windows
- Sash and case windows
- Stone surrounds
- Brick reveals
- Timber door frames
- Period & listed homes
Dunton questions
What guarantee comes with sand mastic in Dunton?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Is Dunton in your area for sand mastic?
Yes. We work across London and the South East, and Dunton is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can sand mastic be painted?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will talk you through it.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Does someone need to be in?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all.
What information do you need?
Tell us what needs doing and where. We will ask anything else we need to know.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Leave the new mastic unpainted
- Plan mastic work ahead of painting
- Check the mastic when you check the paintwork
- Have rotten timber repaired before new mastic goes in
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
What affects the quote in Dunton
The price is agreed before any work begins. It takes into account:
- Any working-time requirements on site
- How many areas need sealing
- The old material and how stubborn it is
- Whether the work is at height
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
When you contact us, it’s useful to know:
- How we’d reach the joints
- Photos by email, if that is easy
- The problem you’ve noticed
- If someone has resealed it before
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or drop us an email with the details and send pictures if you have them.
Frames and glazing around Dunton
Historic houses like Ascott House (about 4.4 miles east) are a reminder that the area around Dunton 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. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Dunton, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint. For an older house near a landmark such as Church of St Martin, the joint between an old wall and a newer frame is generally the first place rain gets in.
Dunton is about 6 miles north of Aylesbury, in Buckinghamshire. From the centre of Dunton to the outskirts, we cover sand mastic for every kind of property. Dunton is one of 263 towns and villages in Buckinghamshire we cover. We also work in Oxford, around 21 miles away.
Our applicators cover all of the MK18 postcode area for sand mastic and the streets around it. Close by, we work in Swanbourne (2 miles north-west), Mursley (3 miles north), Granborough (3 miles west), Winslow (4 miles north-west) and Little Horwood (4 miles north). Further out, we also cover 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).
Around Dunton
Other landmarks nearby include Tindal Centre (6 miles south) and Bolbec Castle (2.5 miles south-west).
Different surfaces, different methods
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Sash and case windows
On a sash window, the mastic joint shows on the outside so we finish it carefully.
Landlord and commercial work in Dunton
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
We also work for property managers and facilities teams in Dunton and across Buckinghamshire. We can quote a run of properties together, and we are fully insured for the work.
DIY sealant or a professional job?
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.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.