Hampshire · England
Calshot Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Calshot, backed by a 12-month guarantee. Ask us for a quote.
- Old sand mastic that has cracked, crumbled or fallen out
- Cracked mastic round a front door frame
- Cement or filler used on old window joints that has cracked
Frames and glazing around Calshot
Calshot is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around older windows and doors, especially on the side facing the sea. With historic houses such as Osborne House (about 4.9 miles south-east) nearby, there’s older building stock in the area around Calshot 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.
For an older house near a landmark such as St George, the joint between an old wall and a newer frame is usually the first place rain gets in.
Calshot is about 4 miles north of Cowes, in Hampshire. Every kind of property in Calshot is covered for sand mastic. Every job comes with our one-year guarantee. Calshot is one of 683 towns and villages in Hampshire where we work. For nearby work, see our Southampton page (8 miles or so).
Work in SO45 works the same way as everywhere else we cover. Streets in the area include Bus Drove, Elmfield Lane and Tristan Close, all of which we cover. We also cover Hillhead (1 mile south-east), Sprat's Down (1 mile west), Stanswood (1 mile south-west), Stonehills (1 mile north-west) and Ashlett (1 mile north-west). We also work in nearby towns such as Gosport (8 miles east), Havant (15 miles east), Eastleigh (11 miles north), Fareham (6 miles north-east), Horndean (15 miles north-east) and Totton (11 miles north-west).
Near you in Calshot
Calshot’s nearest station is Hamble station, about 4.1 miles north. A little further out are Calshot Castle (1.1 miles north-east) and Coldeast (4.5 miles north-east). The countryside around Calshot includes Mercury Marshes and Mill Hill.
Sand mastic in Calshot, done properly
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, applied by hand. On period homes, it looks right where silicone wouldn’t. Typical jobs include mastic dropping out of the joint and draughty sash windows at the surround, on sash and case windows, timber door frames and stone surrounds.
Outdoor sealant needs dry, clean surfaces, so work on frames around Calshot is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
You are covered for a year from the day we finish. If anything isn’t right with it, ring 0345 464 0079 or send us an email.
- Location
- Calshot (SO45)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Looking after it afterwards
Aftercare is simple:
- Renew mastic before redecorating the windows
- Ask us before painting near the mastic
- Get any rot dealt with first
- Keep modern sealant off the mastic
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a single window, longer for several and we leave things clean and tidy. In a small place like Calshot, 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.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
How to get a quote
For sand mastic in Calshot, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
Related advice
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured for the work.
How we quote for sand mastic
Your quote is based on your job. We take into account:
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- The number and length of the joints
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- The problem you’ve noticed
- Any previous sealing or DIY work
- How we’d reach the joints
- Pictures of the joints, sent by email
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Signs you need sand mastic in Calshot
Age is the main cause. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
It’s worth asking for a quote if you see:
- Old cement repairs round a window that have failed
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
- Gaps where the frame meets the masonry
If you let a flat or house near Hamble station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- How long the guarantee is
- Whether the sealant suits the joint
- How much experience the applicator has
- How hidden problems are handled
Calshot questions
Does living near the coast affect sand mastic in Calshot?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are generally the first to need attention.
Will you come out to Calshot?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How do I get a quote for sand mastic in Calshot?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or email us with a short description of the job.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we’ll advise.
Can landlords and businesses book you?
Yes. Domestic, commercial and hotel work are all part of what we do.
Is it possible to take out silicone and use sand mastic instead?
Normally, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Can I choose the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.