West Sussex · England
Sand mastic for sash & case windows in Westbourne, West Sussex
Problem with your window and door surrounds in Westbourne? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Old sand mastic that has cracked, crumbled or fallen out
- Window mastic to renew ahead of painting
- Wind and rain getting in round a sash window
Signs you need sand mastic in Westbourne
Sand mastic slowly weathers. It hardens, cracks and starts to come away on the stone or timber.
If you can see any of these, it’s time to have the joints looked at:
- A silicone bead on a sash window that spoils the look
- Old cement repairs round a window that have failed
- Mastic that needs renewing before redecorating
- Gaps where the frame meets the masonry
In the older streets around St John the Baptist's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- What guarantee comes with the work
- Whether they’re fully insured
- How the colour is chosen
- What happens if they find a problem under the old sealant
Sand mastic for homes and businesses in Westbourne
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 and built up by hand. On older homes, it suits the building far better than silicone. If you’re dealing with old sand mastic that has cracked, crumbled or fallen out and gaps where the frame meets the masonry, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around Westbourne is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
You get a 12-month guarantee, the same in Westbourne as everywhere else we work.
- Where
- Westbourne (PO10)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
The process
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The work itself takes a few hours for a single window, longer for several from start to finish. For a village or hamlet like Westbourne, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Tell us about any water getting in
- Clear items away from the joints we are working on
- Mention if the joints have been sealed before
Getting a quote
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and give you a clear quote before we start.
Read more
Surface by surface
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we will confirm what’s needed.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Westbourne questions
Will you come out to Westbourne?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Does living near the coast affect sand mastic in Westbourne?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Should I use sand mastic or silicone?
Sand mastic normally suits period timber windows best. Modern frames normally suit a flexible sealant, and we’ll explain why.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. All the old silicone is removed first so the mastic can sit properly.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Landlords, agents and businesses in Westbourne
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
If you manage several properties in or around Westbourne, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
Honest limits
A few problems are outside what sealant work can do:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Damaged stone surrounds
- Broken panes
If in doubt, call 0345 464 0079 or send us an email and we will say what we think before booking.
What we seal
- Sash and case windows
- Brick reveals
- Period & listed homes
- Timber door frames
- Stone surrounds
- Tenement windows
Windows and doors in Westbourne
Westbourne is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Historic houses like Warblington Castle (about 2.2 miles south-west) are a reminder that the area around Westbourne 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 Westbourne Primary School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Emsworth station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Westbourne is about 3 miles east of Havant, in West Sussex. Jobs in Westbourne get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 371 towns and villages across West Sussex, large and small. Portsmouth is on our list too, around 8 miles away.
Work in PO10 is quoted and booked the same way as anywhere else. That includes homes and businesses on The Square, Church Road and Crockford Road. If you are just outside Westbourne, we cover Lumley (1 mile south), Woodmancote (1 mile east), Emsworth (1 mile south-west), Southbourne (1 mile south-east) and Denvilles (2 miles west). Further out, we also cover Bognor Regis (12 miles south-east), Chichester (7 miles east), Selsey (11 miles south-east), Portfield (7 miles east), Yapton (14 miles east) and East Wittering (7 miles south).
Around Westbourne
Typical jobs here are in homes near Stansted Park, The Good Intent Public House and Bourne Community College. The nearest railway station is Emsworth station, roughly 1 mile south-west. A little further out are Warblington Castle (2.2 miles south-west) and Havant War Memorial Hospital (2.8 miles west). Green spaces nearby include Stoke Down and Brook Meadow (Emsworth).
Also near Westbourne
Also in Westbourne
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
How we quote for sand mastic
Jobs vary more than people expect. The main factors:
- The type of sealant required
- When we can work, for business premises
- The number and length of the joints
- How many areas need sealing
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email.
What to tell us for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- How we’d reach the joints
- Whether it’s a home or a business
- What’s wrong with the joints now
- Whether it has been sealed before
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we will take it from there.