West Sussex · England
Sand mastic for sash & case windows in High Cross, West Sussex
Sand mastic for High Cross and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Tired mastic found when preparing windows for paint
- Gaps where the frame meets the masonry
- Mastic round period door frames that has failed
For landlords and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
If you manage several properties in or around High Cross, several properties can go on one quote. Send us the addresses and the work at each.
About our sand mastic in High Cross
Across High Cross, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. Common call-outs are for failed mastic on an exposed elevation and draughty sash windows at the surround, across stone surrounds, period & listed homes and sash and case windows.
Outdoor sealant needs dry, clean surfaces, so work on frames around High Cross is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
We stand behind the work with a one-year guarantee, so you are not left on your own once the job is done.
- Place
- High Cross (BN6)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Looking after new joints is easy:
- Plan mastic work ahead of painting
- Have rotten timber repaired before new mastic goes in
- Avoid patching sand mastic with silicone
- Find out about consent before window work on a listed home
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
FAQs for High Cross
Do you work for landlords with property near Hassocks station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Is High Cross in your area for sand mastic?
Yes. We work across London and the South East, and High Cross is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in.
What does sand mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or email us and tell us what needs doing and where.
How long does sand mastic take to harden?
It takes a while. The skin forms first, and the full set comes later and we’ll give you an idea for your job.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. On many period windows, sand mastic looks right and suits the building, while modern frames normally get a flexible sealant.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Different surfaces, different methods
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is usually favoured.
The process
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a few hours for a single window, longer for several. In a small place like High Cross, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, phone 0345 464 0079 or email us.
Read more
What we can’t put right
It helps to know what we cannot do:
- Sash cords, weights and draught-proofing of the sashes
- Rotten sashes, sills or window boxes (a joiner’s job)
- Decisions on consent for listed homes
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Sash and case windows
- Period & listed homes
- Brick reveals
- Timber door frames
- Tenement windows
- Stone surrounds
Frames and glazing around High Cross
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Albourne CofE Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Hassocks station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
High Cross is about 4 miles west of Burgess Hill, in West Sussex. Anywhere in BN6, we can carry out sand mastic at your property. We cover 371 towns and villages across West Sussex. You can also see our page for Brighton, roughly 9 miles from High Cross.
We cover every part of BN6 for sand mastic. Nearby, we also carry out sand mastic in Albourne (1 mile south-east), Albourne Green (1 mile south-east), Albourne Street (1 mile south-east), Blackstone (1 mile south-west) and Twineham (2 miles north). Within a short drive, we also cover Crawley (12 miles north), Horsham (10 miles north-west), Worthing (11 miles south-west), Haywards Heath (7 miles north-east), Burgess Hill (4 miles east) and Shoreham-by-Sea (8 miles south).
Around High Cross
The closest station to High Cross is Hassocks station, about 3.4 miles east. A little further out are The Dene Hospital (2.9 miles north-east) and Clayton Castle (3.9 miles south-east). The countryside around High Cross includes Wolstonbury Hill and Woods Mill.
Do you need sand mastic in High Cross?
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
If you can see any of these, it’s time to have the joints looked at:
- Failed mastic on an exposed elevation
- Crumbling sand mastic round a window
- A silicone bead on a sash window that spoils the look
- Open joints round the window box
If you live in an older home near The Parish Church of St Bartholomew, the joint between an old wall and a newer frame is generally the first place rain gets in.
Comparing quotes
- How the joint is cleaned and prepared
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
- Which colour the sealant will be
Places near High Cross
More services for High Cross
What happens if it’s left?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Where a wall is exposed, as many are in small places like High Cross, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why us?
- Quality sealants from Arbo and Everbuild
- More than 20 years in sealant work
- Any old sealant cut out fully, not covered over
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at our cost guide and what customers say.