Hampshire · England
Sand mastic for sash & case windows in Charlton, Hampshire
Sand mastic in Charlton from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Mastic worn away on windows facing the weather
- Draughts and rain around sash boxes
- Tired mastic found when preparing windows for paint
For landlords and businesses
In hotels, rooms out of use cost money, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Landlords and letting agents in Charlton can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
How we handle sand mastic in Charlton
Sand mastic does not last for ever and gaps open up round the frame. We rake it out and renew it so the surround looks right again. We work on stone surrounds, timber door frames and brick reveals, and people most often call us about cement or filler used on old window joints that has cracked and old sand mastic that has cracked, crumbled or fallen out.
Homes in small places like Charlton often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
We stand behind the work with a 12-month guarantee, so you’re covered after we’ve gone.
- Place
- Charlton (SP10)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Check the mastic when you check the paintwork
- Find out about consent before window work on a listed home
- Don’t run silicone over sand mastic
- Go gently near the mastic when preparing windows
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger as more mastic falls out.
Honest limits
A few problems are outside what sealant work can do:
- Damaged stone surrounds
- Decisions on consent for listed homes
- Sashes that need overhauling
If in doubt, phone 0345 464 0079 or email us and we will say what we think.
Where we work in Charlton
- Timber door frames
- Period & listed homes
- Sash and case windows
- Brick reveals
- Stone surrounds
- Tenement windows
Surface by surface
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
More services for Charlton
Frames and glazing around Charlton
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to St Thomas include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in. Managing a site like Harrow Way Community School? Then larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Andover station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Charlton is about 1 mile north-west of Andover, in Hampshire. Our applicators cover sand mastic for homeowners, landlords and businesses in Charlton and the surrounding area, as part of our work across Hampshire. 683 places in Hampshire are on our list, large and small. For nearby work, see our Southampton page (22 miles or so).
Work in SP10 works the same way as everywhere else we cover. Streets in the area include Dacre Close, Home Farm Gardens and Augustine Way, all of which we cover. Close by, we work in Foxcotte (1 mile north-west), Penton Mewsey (1 mile west), Penton Corner (1 mile west), Penton Grafton (1 mile west) and Red Post Bridge (2 miles south-west). Further out, we also cover Winchester (14 miles south-east), Hyde (13 miles south-east), Tidworth (7 miles west), Weeke (13 miles south-east), Stanmore (14 miles south-east) and Ludgershall (6 miles north-west).
Around Charlton
We work in homes and buildings around Portway Infant School and the streets around them. Charlton’s nearest station is Andover station, roughly 0.8 miles south-east of the centre. A little further out are Andover War Memorial Hospital (0.5 miles south-east) and Andover Museum (1.3 miles south-east). Green spaces nearby include Anton Lakes and Mill Lake.
What affects the cost of sand mastic
The quote reflects the job in front of us. We look at:
- Any mould that needs treating
- The amount of work
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we will go through it with you.
What we need to know
What to tell us when you ask for a quote:
- If it’s domestic, commercial or a hotel
- The rough size of the job
- A few photos by email, if you can
- Any access issues, like height or stairs
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
How it works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours per window, depending on the condition of the joints. In a small place like Charlton, 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.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know about parking restrictions
- Plan for the work area to be out of bounds to pets and children
- Mention if the joints have been sealed before
Get a quote
To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Related advice
Charlton: your questions answered
Can you help a landlord with a rental near Andover station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do you cover Charlton for sand mastic?
Yes. Our work covers London and the South East, and Charlton is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Which products do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
How long does sand mastic take to harden?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
Will the old sealant be removed?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.