West Sussex · England
Sand mastic for sash & case windows in East Grinstead, West Sussex
Professional sand mastic in and around East Grinstead, with every bit of old sealant taken out first and a 12-month guarantee.
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
East Grinstead questions
Is East Grinstead in your area for sand mastic?
Yes, East Grinstead is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing.
I let a flat near East Grinstead station. Can you help?
Yes. We work for landlords and letting agents as well as householders. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Are you insured?
Yes, we’re fully insured for domestic and commercial work.
Which is right for my windows, sand mastic or modern sealant?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant, and we’ll explain why.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Sand mastic for homes and businesses in East Grinstead
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. Common call-outs are for a silicone bead on a sash window that spoils the look and weathered mastic on the most exposed windows, on period & listed homes, sash and case windows and tenement windows.
East Grinstead mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. In every case, the joint between frame and wall is what keeps water out.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or send us an email.
- Location
- East Grinstead (RH19)
- Region
- West Sussex
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near East Grinstead
What else we do in East Grinstead
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Signs you need sand mastic in East Grinstead
Over the years, sand mastic weathers. It dries out, cracks and loses its grip from the frame or the masonry.
If you can see any of these, it’s time to have the joints looked at:
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
- Open joints round the window box
- Mastic round period door frames that has failed
In the older streets around Our Lady and St Peter's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before you book
- What happens if the job turns out different
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- Whether all the old sealant comes out first
Frames and glazing around East Grinstead
The South East is one of 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 Saint Hill Manor (about 1.7 miles south-west) are a reminder that the area around East Grinstead 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 landlords with property near East Grinstead station, any sash windows need sound mastic to keep draughts and rain out. Schools such as St Mary's CofE Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
East Grinstead is about 8 miles east of Crawley, in West Sussex. Anywhere in RH19, we cover sand mastic for homes and businesses. East Grinstead is one of 371 places in West Sussex where we work. For nearby work, see our Crawley page (8 miles or so).
Postcode districts we cover here for sand mastic: RH19. Streets in the area include Station Road, High Street and London Road, and we cover them all. East Grinstead is on the A22 and A264, which makes it straightforward to reach with everything needed for sand mastic. Neighbouring places we cover for sand mastic include Dormans Park (1 mile north), Saint Hill Green (2 miles south), Felbridge (2 miles north-west), Ashurst Wood (2 miles south-east) and Felcourt (2 miles north). Larger places within reach include Crawley (8 miles west), Horsham (14 miles west), Haywards Heath (10 miles south-west), Burgess Hill (13 miles south-west), Broadfield (9 miles west) and Bewbush (9 miles west). Being one of West Sussex’s larger places, East Grinstead has homes, rented property and businesses of every kind.
Local landmarks in East Grinstead
We work in homes and buildings around Bush Davies School of Theatre Arts, The Railway pub and Sackville School and the streets around them. There’s a railway station in East Grinstead itself: East Grinstead station. Nearby you will also find East Grinstead Museum (less than half a mile south-east) and Queen Victoria Hospital (0.8 miles north-east). Not far away are Hedgecourt Lake.
Landlords, agents and businesses in East Grinstead
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
We also work for property managers and facilities teams. Several sites can go on one quote.
How the job changes by surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Looking after it afterwards
To keep the joints looking good and working properly:
- Plan mastic work ahead of painting
- Don’t run silicone over sand mastic
- Go gently near the mastic when preparing windows
- Ask the planning authority about consent for listed or conservation-area homes
Leave the new mastic unpainted, as traditional guidance advises. If you’re redecorating, ask us first.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
The process
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to a full day, depending on how many windows. Parking in a town like East Grinstead is generally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- On commercial sites, let us know about site rules
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
Get a quote
We do not publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Advice
Quotes for sand mastic in East Grinstead
The price is agreed before any work begins. It’s based on:
- Any mould that needs treating
- Access and height
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and send you a clear quote before we start.
Helping us quote
Photos help, but a description is a good start. Please mention:
- The problem you’ve noticed
- How many joints, rooms or windows are involved
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
For sand mastic in East Grinstead, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.