West Sussex · England
West Grinstead Sand Mastic
Window and door surrounds in West Grinstead need attention? We remove the old material, prepare the joints and seal them properly.
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
- Mastic that needs renewing before redecorating
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
How we handle sand mastic in West Grinstead
We work across West Grinstead renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. We work on timber door frames, tenement windows and period & listed homes, and the jobs we see most are failed mastic on an exposed elevation and crumbling sand mastic round a window.
Mastic can only go onto a dry, clean joint, so window work in West Grinstead is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- West Grinstead (RH13)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- The amount of work
- Whether there’s mould to deal with
- Working hours on commercial sites
- The old material and how stubborn it is
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
Photos help, but a description is a good start. Please mention:
- The problem you’ve noticed
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
- Whether it has been sealed before
Getting a quote is simple: tell us what needs doing and where. Photos by email help us understand the job, and we’ll take it from there.
What sand mastic looks like in West Grinstead
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Shrine Church of Our Lady of Consolation and St Francis, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
West Grinstead is about 6 miles south of Horsham, in West Sussex. Our applicators cover sand mastic for homes and businesses in West Grinstead and nearby, as part of our work across West Sussex. We cover 371 towns and villages across West Sussex. You can also see our page for Crawley, about 11 miles away.
Our applicators cover all of the RH13 postcode area for sand mastic and the streets around it. That includes homes and businesses on Steyning Road, Carylls Meadow and Clothalls Lane and the roads around them. Other places close to West Grinstead include Littleworth (1 mile south-east), Partridge Green (1 mile south-east), Dial Post (2 miles south-west), Shipley (2 miles west) and Whitehall (2 miles west). We also work in nearby towns such as Crawley (11 miles north-east), Horsham (6 miles north), Worthing (11 miles south), Haywards Heath (10 miles east), Burgess Hill (9 miles east) and Littlehampton (15 miles south-west).
What’s near West Grinstead
Not far away are Knepp Wildland.
Honest limits
To be straight with you, there are a few things sealant will not fix:
- Decayed frames that need repair
- Whether work needs listed building consent
- Sashes that need overhauling
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in West Grinstead
- Stone surrounds
- Period & listed homes
- Timber door frames
- Sash and case windows
- Brick reveals
- Tenement windows
Nearby places to West Grinstead
What else we do in West Grinstead
What we do, step by step
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a single window, longer for several, depending on the amount of work. Somewhere as small as West Grinstead, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- On commercial sites, let us know about site rules
- Mention any tricky access
Getting a quote
If you are in West Grinstead and need sand mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Related advice
Signs you need sand mastic in West Grinstead
Some old mastic was never deep enough. A thin layer doesn’t hold well, which is why we pack deep voids first and get the depth right.
The most common problems we see are:
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
- Patchy fillers round a sash window
- Gaps round a timber door in stone or brick
In and around West Grinstead, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Comparing quotes
- Who turns up on the day
- How the surfaces are prepared before sealing
- Whether they’re fully insured
- Whether VAT is included
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. Around West Grinstead, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why us?
- Fully insured
- Trusted Arbo and Everbuild sealants
- More than 20 years in sealant work
- 12-month guarantee on every job
See our cost guide and customer reviews.
Your questions about sand mastic in West Grinstead
Is there a guarantee on sand mastic in West Grinstead?
All our work, in West Grinstead and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Is West Grinstead in your area for sand mastic?
Yes. Our work covers London and the South East, and West Grinstead is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
What should I tell you?
Let us know what needs doing and where. If we need more, we’ll ask.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it OK to seal over old sealant?
No. The old sealant always comes out first.
Is consent needed for window work on a listed home?
Checking first is sensible. Your local planning authority can say if consent is needed for listed or conservation-area properties.