West Sussex · England
Sand mastic for sash & case windows in East Dean, West Sussex
Sand mastic in East Dean from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
What affects the cost of sand mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- How many rooms, windows or areas are involved
- Which sealant suits the joint
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email and we’ll talk you through it.
What we need to know
To make quoting easier, please include:
- A few pictures by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
- The rough size of the job
For sand mastic in East Dean, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Sand mastic for homes and businesses in East Dean
We renew sand mastic around sash windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. If you have window mastic to renew ahead of painting and crumbling sand mastic round a window, we can put it right, on sash and case windows, timber door frames and stone surrounds alike.
Outdoor sealant needs dry, clean surfaces, so work on frames around East Dean is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Every job is covered by our one-year guarantee.
- Location
- East Dean (PO18)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Also in East Dean
The process
The work is kept neat and contained to the joints we are treating, so you can carry on as normal. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we tell you how long to leave it before we go. Somewhere as small as East Dean, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- Move anything stored near the joints
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
Get a quote
We quote each job on its own. Just call 0345 464 0079 or drop us an email with the details and send pictures if you have them.
Read more
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
When to call us in East Dean
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
It’s worth asking for a quote if you see:
- Cement or filler used on old window joints that has cracked
- Cracked mastic round a front door frame
- Window mastic to renew ahead of painting
- Open joints round the window box
In and around East Dean, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- How long to leave it before use
- What guarantee comes with the work
- What happens if they find a problem under the old sealant
- Is the old sealant removed completely?
Questions from East Dean
Do you cover East Dean for sand mastic?
Yes, East Dean is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear quote.
What guarantee comes with sand mastic in East Dean?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you work for landlords and businesses?
Yes. As well as householders, we work for landlords, agents, businesses and hotels in East Dean.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can you replace silicone on a period window with sand mastic?
Normally, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Why act early in East Dean
An open joint round the frame lets weather in. Water can get to the frame and the masonry so renewing it early protects the window. Older cottages and farmhouses around East Dean can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and send you a clear quote before work begins.
What you get with us
- Domestic, commercial and hotel work
- Anti-fungal sanitary silicone in wet areas
- Full insurance on every job
- Quality sealants from Arbo and Everbuild
Read our cost guide or customer reviews.
Sand mastic in East Dean: local notes
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like West Dean House (about 2.6 miles west) are a reminder that the area around East Dean 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.
For an older house near a landmark such as The Parish Church of All Saints, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
East Dean is about 6 miles north-east of Chichester, in West Sussex. Anywhere in PO18, we cover sand mastic for homes and businesses. Our West Sussex coverage runs to 371 places, East Dean among them. Portsmouth is on our list too, around 17 miles away.
All of PO18 is covered for sand mastic, from the main roads to the quietest streets. That includes homes and businesses on Main Road, Chapel Row and Charlton Road. Other places close to East Dean include Charlton (1 mile west), Singleton (2 miles west), West Dean (3 miles west), Heyshott (3 miles north) and Cocking (3 miles north-west). We also work in nearby towns such as Worthing (15 miles south-east), Bognor Regis (8 miles south), Chichester (6 miles south-west), Selsey (13 miles south), Littlehampton (11 miles south-east) and Emsworth (10 miles south-west).
Near you in East Dean
Around East Dean, our work takes us to homes and buildings near The Star And Garter Public House. Nearby you will also find Weald and Downland Gridshell (1.8 miles west) and Chichester Centre (5 miles south-west). Open spaces near East Dean include Graffham Common and Levin Down.
How to look after the new joints
After the cure time, these simple habits help:
- Avoid heavy scraping on the mastic joint
- Get any rot dealt with first
- Ask us before painting near the mastic
- Look over the window mastic once a year
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Planning or listed building consent (your local planning authority decides)
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that rattle, stick or will not open
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Surfaces we seal
- Period & listed homes
- Stone surrounds
- Timber door frames
- Sash and case windows
- Brick reveals
- Tenement windows