Buckinghamshire · England
External & façade joints in Dunton, Buckinghamshire
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Dunton. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
- Rigid filler in a joint that should flex
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
A DIY attempt does not rule out a professional job. We cut it out and start again.
How we handle external mastic in Dunton
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. We work on render & cladding joints, copings & trims and joints between brick and frames, and the jobs we see most are failed sealant between panels on a façade and sealant that has lost its bond to the brick or render.
In a village or hamlet like Dunton, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
Whatever the size of the job, it’s backed by our 12-month guarantee in Dunton and across Buckinghamshire.
- Location
- Dunton (MK18)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about external mastic in Dunton
Will you come out to Dunton?
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.
Can you do external mastic in Dunton?
Yes. We work across London and the South East, and Dunton is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for letting agents?
Yes, regularly. Several properties can go on one quote, and between tenancies is a good time for the work.
Will the old sealant be removed?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first.
When to call us in Dunton
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Signs it’s time to call us include:
- Movement joints with cracked, split or missing sealant
- Joints pointed up with cement by mistake
- Panel joints letting water in
- Joints where the bead has come unstuck
If you live in an older home near Church of St Martin, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What to look for in a quote
- How long the guarantee is
- What happens if the job turns out different
- How the surfaces are prepared before sealing
- What product goes in the joint
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
More services for Dunton
How the job changes by surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant if the joint can be cleared.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
How it works
Good joint work is mostly preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes anything from a few hours to several days, depending on the building. Somewhere like Dunton needs a little journey planning: 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 start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
Get a quote
If you are in Dunton and need external mastic, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Related advice
Dunton buildings 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. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Dunton, as everywhere, external mastic is only as good as the preparation behind it.
Dunton is about 6 miles north of Aylesbury, in Buckinghamshire. Dunton gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 263 places in Buckinghamshire are on our list, from the larger towns to small villages. You can also see our page for Oxford, about 21 miles away.
Postcode districts we cover here for external mastic: MK18. If you’re just outside Dunton, we cover 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).
Landmarks near Dunton
Other landmarks nearby include Tindal Centre (6 miles south) and Bolbec Castle (2.5 miles south-west).
What affects the quote in Dunton
The quote reflects the job in front of us. We take into account:
- The product the joint needs
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- Whether the work is at height
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Helping us quote
Photos help, but a description is a good start. Please mention:
- The rough size of the job
- What’s wrong with the joints now
- Photos by email, if that’s easy
- Any access issues, like height or stairs
We quote each job on its own, so the first step is telling us about yours. Just phone 0345 464 0079 or email us with the details.
Looking after it afterwards
After the cure time, these simple habits help:
- Have failed joints looked at early
- Keep high-pressure jets off the joints
- Ask before painting over external sealant
- Make sure movement joints are not pointed over
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.