West Sussex · England
Sharpthorne Sand Mastic
Our applicators work in Sharpthorne on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Silicone on a period window that looks wrong
- Gaps round a timber door in stone or brick
- Gaps where the frame meets the masonry
What happens on the day
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to a full day, depending on how many windows for a typical job. Somewhere like Sharpthorne needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- 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.
Before we arrive
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
Related advice
Sand mastic in Sharpthorne
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. We’re often asked to deal with wind and rain getting in round a sash window and window mastic to renew ahead of painting, across timber door frames, period & listed homes and stone surrounds.
In a village or hamlet like Sharpthorne, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
Big or small, it’s backed by our one-year guarantee.
- Place
- Sharpthorne (RH19)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Sharpthorne
What else we do in Sharpthorne
What affects the cost of sand mastic
Jobs vary more than people expect. The main factors:
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- The type of sealant required
- The size of the job
Combining jobs into one visit is generally more efficient than separate visits. We will send you a clear quote for the lot.
Helping us quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- How we’d reach the joints
- If it’s domestic, commercial or a hotel
- The rough size of the job
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.
How the job changes by surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is normally favoured.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Sharpthorne questions
Can you help a landlord with a rental near East Grinstead station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Do you cover smaller places like Sharpthorne?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later, and we will tell you what to expect.
What should I tell you?
A short description and the location. If we need more, we will ask.
Can you match the sealant colour?
In most cases you can choose. We’ll tell you which colours the right product comes in and agree one before we start.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How much does sand mastic cost in Sharpthorne?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Do you need sand mastic in Sharpthorne?
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out so we make sure the new mastic is the right thickness.
People generally contact us after spotting something like this:
- Old cement repairs round a window that have failed
- Cracked mastic round a front door frame
- Modern sealant on a period surround
- Draughts and rain around sash boxes
Managing a site like West Hoathly CofE Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- What preparation is included
- Whether the sealant suits the joint
- What guarantee comes with the work
- How the colour is chosen
Sharpthorne homes and the weather
With historic houses such as Priest House (about 0.5 miles west) nearby, there’s older building stock in the area around Sharpthorne as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near East Grinstead station, older sash windows in a rental need their mastic kept sound to keep the weather out. If you live in an older home near St Margaret's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Sharpthorne is about 4 miles south of East Grinstead, in West Sussex. If you need sand mastic in Sharpthorne, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We cover West Sussex from our Crawley base. Across West Sussex, we cover 371 places, Sharpthorne among them. Crawley is on our list too, around 7 miles away.
All of RH19 is covered for sand mastic, from the main roads to the quietest streets. Whether your property is on Station Road, Marlpit Road and Bayhams Field or a nearby road, we can help. We also cover the places around Sharpthorne: West Hoathly (1 mile west), Highbrook (2 miles south), Selsfield Common (2 miles north-west), Little London (2 miles south-west) and Birchgrove (3 miles south-east). Further out, we also cover Crawley (7 miles west), Horsham (12 miles west), Haywards Heath (6 miles south-west), Burgess Hill (9 miles south-west), East Grinstead (4 miles north) and Broadfield (7 miles west).
What’s near Sharpthorne
Around Sharpthorne, our work takes us to homes and buildings near The Fox pub and the streets around them. The nearest railway station is East Grinstead station, roughly 3.6 miles north of the centre. A little further out are Waterbury Castle (2.6 miles south) and East Grinstead Museum (3.7 miles north-east). Not far away are Hedgecourt Lake.
Aftercare tips
A little care helps the new joints last. Our advice:
- Find out about consent before window work on a listed home
- Take care around the mastic when scraping paint
- Don’t paint over the new mastic
- Avoid patching sand mastic with silicone
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
Landlords, agents and businesses in Sharpthorne
Landlords and agents in Sharpthorne can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.