West Sussex · England
Sand mastic for sash & case windows in South Ambersham, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in South Ambersham and across West Sussex. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Mastic that needs renewing before redecorating
When it isn’t the sealant
To be straight with you, there are a few things sealant won’t fix:
- Crumbling stone or brickwork round the window
- Sashes that rattle, stick or will not open
- Cracked or broken glass
If in doubt, call 0345 464 0079 or send us an email and we will say what we think before booking.
Where we work in South Ambersham
- Brick reveals
- Timber door frames
- Period & listed homes
- Tenement windows
- Stone surrounds
- Sash and case windows
How we handle sand mastic in South Ambersham
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. If you are dealing with window mastic to renew ahead of painting and gaps round a timber door in stone or brick, we can help, whatever the surface.
Around South Ambersham, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
A one-year guarantee comes as standard.
- Location
- South Ambersham (GU29)
- Region
- West Sussex
- Cover
- A year, on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Where a wall is exposed, as many are in small places like South Ambersham, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why South Ambersham customers choose us
- Neat joints and a tidy finish
- Old sealant always removed completely
- Sanitary silicone with an anti-fungal additive in wet areas
- Homes, businesses and hotels
Take a look at what affects the cost and our reviews.
What the job involves on each surface
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we’ll confirm access.
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
How the visit works
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes a few hours for a single window, longer for several, depending on how much there is to do. For a village or hamlet like South Ambersham, 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.
- Each surround is checked first.
- The joint is raked out and cleaned.
- 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
- Tell us if parking is tricky
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
Ask for a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Read more
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Keep sills and gutters clear so water drains away
- Leave the new mastic unpainted
- Avoid patching sand mastic with silicone
- Check the mastic when you check the paintwork
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
Places near South Ambersham
Other services in South Ambersham
Do you need sand mastic in South Ambersham?
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
It’s worth asking for a quote if you see:
- Patchy fillers round a sash window
- Crumbling sand mastic round a window
- Gaps between timber frames and stone or brick
- Modern sealant on a period surround
If you live in an older home near Church of St James, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- Whether they’re fully insured
- Whether they seal over old material or remove it
- Is VAT in the price?
- How the surfaces are prepared before sealing
Should I try it myself first?
A careful DIYer can reseal a simple joint, 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.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What sand mastic looks like in South Ambersham
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Cowdray House (about 1.7 miles north-west) are a reminder that the area around South Ambersham has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Midhurst Rother College, its window and door frames need their mastic kept sound, just like a home’s.
South Ambersham is about 10 miles north of Chichester, in West Sussex. Our applicators cover sand mastic for homes and businesses in South Ambersham and nearby. South Ambersham is one of 371 places in West Sussex where we work for sand mastic. Our Portsmouth page covers work nearby, about 20 miles away.
We cover every part of the GU29 postcode area for sand mastic. If you’re just outside South Ambersham, we cover Selham (1 mile east), Graffham (2 miles south), River (2 miles north-east), Upperton (3 miles north-east) and Tillington (3 miles east). Further out, we also cover Bognor Regis (13 miles south), Chichester (10 miles south), Littlehampton (14 miles south-east), Emsworth (14 miles south-west), Rustington (14 miles south-east) and Storrington (11 miles east).
What’s near South Ambersham
Nearby you’ll also find Midhurst Community Hospital (2 miles north-west) and Lodsworth Castle (1.1 miles east). Not far away are Graffham Common and Levin Down.
Your questions about sand mastic in South Ambersham
Will you come out to South Ambersham?
Yes. South Ambersham is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is sand mastic in South Ambersham guaranteed?
All our work, in South Ambersham and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Is it possible to take out silicone and use sand mastic instead?
Normally, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We’ll tell you what we’re using and why.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. The weather and joint depth both affect it.