Kent · England
Sand mastic for sash & case windows in South Street, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in South Street and across Kent. Fully insured, ARBOMaster approved and guaranteed for a year.
- Wind and rain getting in round a sash window
- Mastic that needs renewing before redecorating
- Weathered mastic on the most exposed windows
About our sand mastic in South Street
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. Typical jobs include open joints round the window box and mastic dropping out of the joint, on brick reveals, timber door frames and sash and case windows.
Homes in small places like South Street often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Our work is backed for twelve months, in South Street and everywhere else we cover.
- Place
- South Street (ME13)
- Region
- Kent
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Common problems we fix in South Street
Timber frames move with the seasons. The movement cracks the mastic little by little.
People usually contact us when they notice something like this:
- Cement or filler used on old window joints that has cracked
- Draughts and rain around sash boxes
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
For site and facilities teams at buildings such as Boughton-under-Blean and Dunkirk Primary School, the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- How the joint is cleaned and prepared
- Which sealant they’ll use, and why
- Whether they’re fully insured
- Whether all the old sealant comes out first
What we do, step by step
Good joint work is mostly preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a single window, longer for several. Somewhere like South Street needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Clear the area around the work
- Mention any parking rules near the property
- On commercial sites, let us know about site rules
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Advice
What happens if it’s left?
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Where a wall is exposed, as many are in small places like South Street, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
What you get with us
- A 12-month guarantee on all work
- We never seal over old sealant
- Full insurance on every job
- Tidy, careful work
See what affects the cost and what customers say.
What the job involves on each surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Go gently near the mastic when preparing windows
- Check the mastic when you check the paintwork
- Keep modern sealant off the mastic
- Make sure water runs off the sill
Leave the new mastic alone while it firms up. It skins over quickly, but takes longer to harden fully.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Landlords, agents and businesses in South Street
We also work for property managers and facilities teams in South Street and across Kent. We can quote a run of properties together, and we’re fully insured.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
South Street homes and the weather
Historic houses like Belmont House and Gardens (about 4.4 miles west) are a reminder that the area around South Street has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Selling station, any sash windows need sound mastic to keep draughts and rain out. For an older house near a landmark such as Church of St Peter and St Paul, the joint between an old wall and a newer frame is normally the first place rain gets in.
South Street is about 3 miles south-east of Preston, in Kent. Anywhere in ME13, we cover sand mastic for homes and businesses. 922 places in Kent are on our list, from the larger towns to small villages. You can also see our page for Chelmsford, about 37 miles away.
Jobs for sand mastic in ME13 is quoted and booked the same way as anywhere else. That includes homes and businesses on North Lane and South Street and the roads around them. Nearby, we also carry out sand mastic in Crouch (1 mile north-west), Oversland (1 mile east), Neames Forstal (1 mile south-west), Hickmans Green (1 mile north-east) and Winterbourne (1 mile east). Further out, we also cover Ashford (10 miles south), Canterbury (6 miles east), Sittingbourne (10 miles north-west), Whitstable (6 miles north-east), Faversham (3 miles north-west) and Herne Bay (10 miles north-east).
Near you in South Street
Locally, jobs take us to homes and businesses close to Mount Ephraim Gardens and The Sondes Arms. South Street has its own railway station: Selling station. Well-known places in the area include Eastbridge Hospital of St Thomas the Martyr (5.7 miles east) and Tower keep castle at Chilham (2.8 miles south). Open spaces near South Street include Blean Woods RSPB Reserve.
Nearby places to South Street
Other services in South Street
Common questions in South Street
Do you work for landlords with property near Selling station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Is South Street within the area you cover?
Yes. South Street is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic normally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we’ll explain why.