West Sussex · England
Sand mastic for sash & case windows in Charlton, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Charlton. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
- Silicone on a period window that looks wrong
Questions from Charlton
Will you come out to Charlton?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is sand mastic in Charlton guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Can you seal over the old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
When will the new mastic be hard?
It forms a skin fairly soon and it hardens fully over a longer time. Timing depends on the weather and the joint.
Can old silicone round a sash window be swapped for sand mastic?
Usually, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in.
What exactly is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Sand mastic for homes and businesses in Charlton
Sand mastic suits most period window surrounds. Newer frames usually get a flexible sealant instead and we’ll explain which is best for yours. If you have tired mastic found when preparing windows for paint and gaps round a timber door in stone or brick, we can help, on sash and case windows, timber door frames and brick reveals alike.
Somewhere as small as Charlton, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
A one-year guarantee comes as standard.
- Location
- Charlton (PO18)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. Older cottages and farmhouses around Charlton can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why book with us
- Tidy, careful work
- Full insurance on every job
- Arbo and Everbuild products
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide and our reviews.
What sand mastic looks like in 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. Historic houses like West Dean House (about 1.7 miles west) are a reminder that the area around Charlton 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.
Managing a site like Singleton CofE Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Charlton is about 5 miles north of Chichester, in West Sussex. Homes, rented property, offices and hotels in Charlton is covered for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Charlton is one of 371 towns and villages in West Sussex we cover for sand mastic. You can also see our page for Portsmouth, roughly 16 miles from Charlton.
Our applicators cover all of PO18 for sand mastic. Streets in the area include Charlton Road and Knight's Hill, all of which we cover. Neighbouring places we cover for sand mastic include Singleton (1 mile west), East Dean (1 mile east), West Dean (2 miles west), Cocking (3 miles north) and Heyshott (3 miles north). Further out, we also cover Bognor Regis (9 miles south), Chichester (5 miles south), Selsey (12 miles south), Littlehampton (11 miles south-east), Emsworth (10 miles south-west) and Rustington (12 miles south-east).
Around Charlton
Other landmarks nearby include Chichester Centre (4.6 miles south) and Weald and Downland Gridshell (0.8 miles west). For a walk, there’s Levin Down and Kingley Vale National Nature Reserve.
Towns and villages near Charlton
Other services in Charlton
Common problems we fix in Charlton
Age is the main cause. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
The problems people usually mention when they call include:
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
- Draughty sash windows at the surround
- Mastic that needs renewing before redecorating
For an older house near a landmark such as The Parish Church of the Blessed Virgin Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- How the surfaces are prepared before sealing
- What product goes in the joint
- What guarantee comes with the work
- When the joint can take water or movement
How it works
At the end, we look at the finished work together and explain the cure time. The visit itself usually takes a few hours for a single window, longer for several, depending on the size of the job. For a village or hamlet like Charlton, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
How to get a quote
If you’re in Charlton and need sand mastic, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Read more
When it isn’t the sealant
It helps to know what we can’t do:
- Decisions on consent for listed homes
- Sashes that rattle, stick or will not open
- Damaged stone surrounds
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Where we work in Charlton
- Stone surrounds
- Sash and case windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Tenement windows
How the job changes by surface
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Renew mastic before redecorating the windows
- Find out about consent before window work on a listed home
- Inspect the joints round the windows every year or so
- Clear gutters so water does not pour onto the windows
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Quotes for sand mastic in Charlton
We don’t publish a price list. The quote depends on:
- The number and length of the joints
- Mould in or behind the old joints
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
What to tell us for a quote
To help us quote quickly, please include:
- Where the property is
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
Getting a quote is simple: let us know the job and the location and its rough size. A few photos by email make the job easier to understand.