Hampshire · England
Sand Mastic in South Town
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in South Town and across Hampshire. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Open joints round the window box
- Cracked mastic round a front door frame
- Weathered mastic on the most exposed windows
What happens on the day
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere as small as South Town, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we are working on
- Mention any leaks or damp you’ve noticed
Get a quote
There’s no standard price list. Instead, we send you a clear quote for your job. To arrange one, ring 0345 464 0079 or email us.
Read more
About our sand mastic in South Town
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. If you are dealing with crumbling sand mastic round a window and cement or filler used on old window joints that has cracked, we can help.
Somewhere as small as South Town, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job, large or small.
- Where
- South Town (GU34)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
When to call us in South Town
Some old mastic was never deep enough. Mastic that is too thin cracks and drops out so we make sure the new mastic is the right thickness.
If you can see any of these, it’s time to have the joints looked at:
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
If you let a flat or house near Alton station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Before you book anyone
- Is VAT in the price?
- Who does the work, and how experienced they are
- How the colour is chosen
- Are they insured?
What sand mastic looks like in South Town
With historic houses such as Bentworth Hall (about 1.4 miles north-east) nearby, there’s older building stock in the area around South Town as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Andrew, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Medstead Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s.
South Town is about 4 miles west of Alton, in Hampshire. For sand mastic in and around South Town, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We cover Hampshire from our Crawley base, South Town included. Across Hampshire, we cover 683 places, South Town among them. For nearby work, see our Southampton page.
Work in GU34 works the same way as everywhere else we cover. Sand mastic is available to properties on High Street, Church Lane and Green Stile. If you’re just outside South Town, we cover New Copse (1 mile north), Hattingley (1 mile west), Medstead (1 mile south-east), Soldridge (1 mile south) and Holt End (1 mile north). We also work in nearby towns such as Basingstoke (10 miles north), Winchester (12 miles south-west), Fleet (14 miles north-east), Horndean (15 miles south), Alton (4 miles east) and Petersfield (10 miles south-east).
What’s near South Town
The nearest railway station is Alton station, roughly 4.5 miles east of the centre. Other landmarks nearby include Barton Castle (2.2 miles west) and Alton Community Hospital (3.4 miles east). Not far away are King's Hill.
What affects the quote in South Town
There’s no set price list, because jobs vary so much. The quote depends on:
- How many rooms, windows or areas are involved
- Whether the work is at height
- Working hours on commercial sites
- Any mould that needs treating
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or drop us an email.
Asking for a quote
When you contact us, it’s useful to know:
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
- A few pictures by email, if you can
- If it’s domestic, commercial or a hotel
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or send us an email with the details and send photos if you have them.
Why act early in South Town
New mastic over crumbling mastic won’t hold. We remove the loose material first so the new work lasts. Around South Town, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first.
Why book with us
- 20+ years of sealant experience
- Fully insured
- ARBOMaster approved applicator
- Old sealant always removed completely
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Other services in South Town
Common questions in South Town
I let a flat near Alton station. Can you help?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Is South Town in your area for sand mastic?
Yes. We work across London and the South East, and South Town is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear price.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Are you insured?
Yes. We’re fully insured for every job we do.
Can old silicone round a sash window be swapped for sand mastic?
Yes. The silicone is cut out and the joint cleaned before the sand mastic goes in.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Inspect the joints round the windows every year or so
- Renew mastic before redecorating the windows
- Keep modern sealant off the mastic
- Avoid heavy scraping on the mastic joint
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.