West Sussex · England
Sand Mastic in West Thorney
Problem with your window and door surrounds in West Thorney? We cut out the old, prepare the joints and apply the right sealant.
- Cracked mastic round a front door frame
- Silicone on a period window that looks wrong
- Crumbling sand mastic round a window
Why act early in West Thorney
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. Where a wall is exposed, as many are in small places like West Thorney, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
What you get with us
- Rated 4.9 stars on Google
- Neat joints and a tidy finish
- ARBOMaster approved applicator
- Homes, businesses and hotels
Read our cost guide and what customers say.
About our sand mastic in West Thorney
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. If you have open joints round the window box and tired mastic found when preparing windows for paint, we can help, whatever the surface.
Around West Thorney, 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, so you are not left on your own once the job is done.
- Location
- West Thorney (PO10)
- Region
- West Sussex
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
West Thorney: your questions answered
Is sand mastic in a coastal place like West Thorney any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Can you help a landlord with a rental near Southbourne station?
Yes. We work for letting agents and landlords as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Do you work in West Thorney?
Yes. We cover West Thorney and the rest of West Sussex, as part of our work across South East England, London and Scotland. For a quote, phone 0345 464 0079 or send us an email.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
Do you offer different sealant colours?
We will suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Can you replace silicone on a period window with sand mastic?
Normally, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
How the visit works
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a single window, longer for several. In a small place like West Thorney, access is normally the main thing to plan. 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.
- Large voids are packed out first, so the mastic is not too thick.
- 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.
Getting ready for the visit
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
- Move anything stored near the joints
Get a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.
Related advice
What the job involves on each surface
Stone surrounds
Stone surrounds suit sand mastic well. The finish blends with the masonry.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Towns and villages near West Thorney
Other services in West Thorney
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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.
Common problems we fix in West Thorney
Previous repairs in cement or silicone often trap water or crack away. They don’t suit the joint, and they generally need raking out.
Most people get in touch when they notice something like this:
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
If you look after a building such as Thorney Island Community Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- What the quote includes, VAT included or not
- Who turns up on the day
- What happens if they find a problem under the old sealant
- What the cure time is
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Make sure water runs off the sill
- Inspect the joints round the windows every year or so
- Leave the new mastic unpainted
- Have rotten timber repaired before new mastic goes in
Avoid painting over the new mastic, as traditional guidance advises. Ask us before any decorating around it.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
When it isn’t the sealant
To be straight with you, there are a few things sealant won’t fix:
- Planning or listed building consent (your local planning authority decides)
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Brick reveals
- Tenement windows
- Timber door frames
Sand mastic in West Thorney: local notes
West Thorney is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Historic houses like Warblington Castle (about 3.1 miles north-west) are a reminder that the area around West Thorney has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For an older house near a landmark such as The Parish Church of St Nicholas, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Southbourne station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
West Thorney is about 5 miles south-east of Havant, in West Sussex. Anywhere in PO10, we can carry out sand mastic at your property. Our area takes in 371 places across West Sussex, from the larger towns to small villages. For nearby work, see our Portsmouth page.
Work in PO10 is quoted and booked the same way as anywhere else. Close by, we work in Thorney Island (1 mile north-west), Tye (2 miles west), Southbourne (2 miles north), North Hayling (2 miles west) and Northney (2 miles west). Within a short drive, we also cover Bognor Regis (10 miles east), Chichester (6 miles east), Selsey (8 miles south-east), Emsworth (3 miles north-west), Portfield (7 miles east) and Yapton (13 miles east).
Near you in West Thorney
We work in homes and buildings around Eames Farm and Bourne Community College, among other places. The closest station to West Thorney is Southbourne station, about 2.2 miles north of the centre. Other landmarks nearby include Emsworth Museum (2.5 miles north-west) and Warblington Castle (3.1 miles north-west). Not far away are Nutborne Marshes.