West Sussex · England
Sand Mastic in Duncton
Sand mastic for Duncton and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Silicone on a period window that looks wrong
- Open joints round the window box
- Cracked mastic round a front door frame
Sand mastic for homes and businesses in Duncton
On many period windows, sand mastic looks right and suits the building. Newer frames generally get a flexible sealant instead and we will explain which is best for yours. If you have mastic worn away on windows facing the weather and open joints round the window box, we can help, whatever the surface.
Somewhere as small as Duncton, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Place
- Duncton (GU28)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Duncton
What guarantee comes with sand mastic in Duncton?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Is Duncton in your area for sand mastic?
Yes. We work across London and the South East, and Duncton is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Can you do several jobs on one visit?
Yes. Just list everything you need and you will get one quote.
Will it make a mess?
No. The area is protected while we work and cleaned up afterwards.
Can old silicone round a sash window be swapped for sand mastic?
Normally, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. We remove it all first.
How long will you be here?
Most jobs take anything from a few hours to a full day, depending on how many windows, including preparation and clearing up. Your quote will say how long we expect yours to take.
Common problems we fix in Duncton
Age is the main cause. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
It’s worth asking for a quote if you see:
- Old cement repairs round a window that have failed
- Draughty sash windows at the surround
- A silicone bead on a sash window that spoils the look
- Gaps between timber frames and stone or brick
For site and facilities teams at buildings such as Duncton CofE Junior School, larger buildings have plenty of frames, and the mastic around each one ages.
Before booking anyone
- Whether they’re fully insured
- How long the guarantee is
- Who turns up on the day
- What happens if the job turns out different
Why act early in Duncton
If you’re redecorating, renew the mastic first. Painting over failed mastic does not seal it and traditional guidance is to leave the new mastic unpainted. Around Duncton, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why book with us
- Approved under the ARBOMaster scheme
- A 12-month guarantee on all work
- Old sealant always removed completely
- Sanitary silicone with an anti-fungal additive in wet areas
See our cost guide and our reviews.
How it works
We keep the work tidy and contained to the area we are working on, so you can carry on as normal. Expect the work to take a few hours for a single window, longer for several. For a village or hamlet like Duncton, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.
Read more
Towns and villages near Duncton
Also in Duncton
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
How the job changes by surface
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Clear gutters so water doesn’t pour onto the windows
- Sort the mastic before the decorators arrive
- Leave the new mastic unpainted
- Ask the planning authority about consent for listed or conservation-area homes
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger as more mastic falls out.
Should I try it myself first?
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 fails, we can still redo it.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Sand mastic in Duncton: local notes
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. Historic houses like Bignor Roman Villa (about 2.4 miles south-east) are a reminder that the area around Duncton has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you live in an older home near Church of Holy Trinity, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Duncton is about 10 miles north-east of Chichester, in West Sussex. Our applicators cover sand mastic for homeowners, landlords and businesses in Duncton and the surrounding area. We cover 371 towns and villages across West Sussex, from the larger towns to small villages. You can also see our page for Crawley, roughly 22 miles from Duncton.
We cover every part of the GU28 postcode area for sand mastic. If you need sand mastic at a property on Duncton High Street and Willett Close or a nearby road, we can help. We also cover the places around Duncton: East Lavington (1 mile south-west), Sutton (2 miles south-east), Rotherbridge (2 miles north), Graffham (2 miles west) and Haslingbourne (2 miles north-east). Within a short drive, we also cover Worthing (13 miles south-east), Bognor Regis (11 miles south), Chichester (10 miles south-west), Littlehampton (10 miles south-east), Emsworth (15 miles south-west) and Rustington (11 miles south-east).
What’s near Duncton
In Duncton, that means homes and buildings near The Parish Church of St Peter. Nearby you will also find Midhurst Community Hospital (5.4 miles north-west) and Coultershaw Heritage Site (1.6 miles north-east). Green spaces nearby include Bignor Hill and Graffham Common.