West Sussex · England
Sand mastic for sash & case windows in Ashurst, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Ashurst. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
- Cement or filler used on old window joints that has cracked
How the job changes by surface
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.
Period and listed homes
Many older homes were built with sand mastic round the windows. If your home is listed, ask your local planning authority about consent.
How we handle sand mastic in Ashurst
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. Typical jobs include cracked mastic round a front door frame and silicone on a period window that looks wrong, on period & listed homes, sash and case windows and brick reveals.
Around Ashurst, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
There’s a 12-month guarantee on every job.
- Location
- Ashurst (BN44)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for sand mastic
Call for a quick quote. The main things that affect it are:
- The product the joint needs
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- How many areas need sealing
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- If someone has resealed it before
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- Photos by email, if that is easy
For sand mastic in Ashurst, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Ashurst homes and the weather
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.
For site and facilities teams at buildings such as Ashurst CofE Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Ashurst is about 7 miles north of Shoreham-by-Sea, in West Sussex. Across the BN44 area, we cover sand mastic for homes and businesses. Across West Sussex, we cover 371 places, and Ashurst is one of them. For nearby work, see our Brighton page.
Here we cover the BN44 postcode area for sand mastic. That includes homes and businesses on Church Lane and School Lane. Other places close to Ashurst include Partridge Green (2 miles north-east), Dial Post (2 miles north-west), Wiston (2 miles south-west), Littleworth (3 miles north) and Ashington (3 miles west). Larger places within reach include Crawley (14 miles north-east), Horsham (9 miles north), Worthing (8 miles south-west), Haywards Heath (11 miles north-east), Burgess Hill (9 miles east) and Littlehampton (12 miles south-west).
Around Ashurst
Typical jobs here are in homes near Fountain Inn. A little further out are Steyning Museum (3.1 miles south). The countryside around Ashurst includes Chanctonbury Hill and Knepp Wildland.
Keeping the joints in good condition
So the new joints stay in good condition:
- Have rotten timber repaired before new mastic goes in
- Plan mastic work ahead of painting
- Avoid patching sand mastic with silicone
- Find out about consent before window work on a listed home
Don’t run silicone over the new mastic. If you see a crack, ask us to take a look rather than patching it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Towns and villages near Ashurst
Other services in Ashurst
When something else is needed
New sealant can’t fix everything, and we’d rather say so up front. It won’t solve:
- Sashes that need overhauling
- Whether work needs listed building consent
- Decayed frames that need repair
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Ashurst
- Timber door frames
- Stone surrounds
- Tenement windows
- Brick reveals
- Sash and case windows
- Period & listed homes
Common questions in Ashurst
Is Ashurst in your area for sand mastic?
Yes. We work across London and the South East, and Ashurst is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear quote.
What guarantee comes with sand mastic in Ashurst?
Every job comes with our one-year guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic normally suits period timber windows best. Modern frames normally suit a flexible sealant, and we’ll explain why.
Can you match the sealant colour?
Yes. White, clear and grey are common, and other colours are available, and we will agree it with you first.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
What information do you need?
Tell us what needs doing and where, with photos by email if possible. We will ask anything else we need to know.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do you work for landlords and businesses?
Yes. We work in homes, commercial premises and hotels, and we’re fully insured.
The process
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Ashurst, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Ask for a quote
There’s no standard price list. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Related advice
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Common problems we fix in Ashurst
Some old mastic was never deep enough. A thin layer does not hold well, which is why we pack deep voids first and get the depth right.
Common reasons people contact us include:
- Old cement repairs round a window that have failed
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
- Old sand mastic that has cracked, crumbled or fallen out
In the older streets around The Parish Church of St James, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- What product goes in the joint
- How long to leave it before use
- Whether VAT is included
- Whether all the old sealant comes out first