Kent · England
Sand mastic for sash & case windows in Stone Cross, Kent
Sand mastic across Stone Cross and nearby, with old sealant always removed completely and a 12-month guarantee.
- Patchy fillers round a sash window
- A silicone bead on a sash window that spoils the look
- Tired mastic found when preparing windows for paint
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
How we handle sand mastic in Stone Cross
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. Typical jobs include tired mastic found when preparing windows for paint and draughts and rain around sash boxes, across sash and case windows, tenement windows and stone surrounds.
Mastic can only go onto a dry, clean joint, so window work in Stone Cross is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Each job carries a 12-month guarantee.
- Location
- Stone Cross (TN3)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
You do not need to clear the whole room or building, just the space around the work. We protect the rest, and the work takes anything from a few hours to a full day, depending on how many windows in most cases. For a village or hamlet like Stone Cross, 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 look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Let us know about stairs, lifts or work at height
- Move anything stored near the joints
Getting a quote
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Advice
What sand mastic looks like in Stone Cross
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Groombridge Place (about 1.1 miles south-east) are a reminder that the area around Stone Cross 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.
If you look after a building such as Fordcombe Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Ashurst Kent station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Stone Cross is about 4 miles west of Royal Tunbridge Wells, in Kent. Our applicators cover sand mastic for homeowners, landlords and businesses in Stone Cross and the surrounding area, as part of our work across Kent. Our Kent coverage runs to 922 places, Stone Cross among them. For nearby work, see our Crawley page.
Here we cover the TN3 postcode area for sand mastic. If you need sand mastic at a property on Ashurst Road and Groombridge Road or a nearby road, our applicators can take on the job. We also cover the places around Stone Cross: Ashurst (1 mile west), Fordcombe (1 mile north), Groombridge (1 mile south), Walter's Green (1 mile north-west) and Teasley Mead (1 mile west). Further out, we also cover Sevenoaks (10 miles north), Royal Tunbridge Wells (4 miles east), Tonbridge (7 miles north-east), Kings Hill (14 miles north-east), Paddock Wood (10 miles east) and Southborough (4 miles north-east).
Local landmarks in Stone Cross
We work in homes and buildings around Chafford Arms and the streets around them. The closest station to Stone Cross is Ashurst Kent station, roughly 1 mile west. Well-known places in the area include Tunbridge Wells Homeopathic Hospital (3.7 miles east) and Bolebroke Castle (3 miles west). Open spaces near Stone Cross include Broadwater Warren RSPB Reserve.
Landlords, agents and businesses in Stone Cross
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
What affects the cost of sand mastic
Your quote is based on your job. We take into account:
- Access and height
- The product the joint needs
- The old material and how stubborn it is
- The number and length of the joints
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What we need to know
When you contact us, it’s useful to know:
- If someone has resealed it before
- Where the property is
- The type of property
- Roughly how big the job is
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Honest limits
In fairness, there are a few things sealant will not fix:
- Whether work needs listed building consent
- Crumbling stone or brickwork round the window
- Sashes that need overhauling
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
Surfaces we seal
- Timber door frames
- Tenement windows
- Period & listed homes
- Sash and case windows
- Brick reveals
- Stone surrounds
Aftercare tips
A little care helps the new joints last. Our advice:
- Have rotten timber repaired before new mastic goes in
- Take care around the mastic when scraping paint
- Check the mastic when you check the paintwork
- Make sure water runs off the sill
Do not run silicone over the new mastic. If anything cracks, get it looked at before trying a quick fix.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Towns and villages near Stone Cross
More services for Stone Cross
FAQs for Stone Cross
Can you do sand mastic in Stone Cross?
Yes. Our work covers London and the South East, and Stone Cross is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
Do you cover smaller places like Stone Cross?
Yes. Stone Cross is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can tenants book the work?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
What information do you need?
Tell us what needs doing and where, with photos by email if possible. We’ll ask anything else we need to know.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
How long does sand mastic take to harden?
It forms a skin fairly soon and it hardens fully over a longer time. The weather and joint depth both affect it.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
When to call us in Stone Cross
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
The most common problems we see are:
- Failed mastic on an exposed elevation
- Mastic round period door frames that has failed
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
Homes close to Church of St Martin of Tours include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- Whether you can choose the colour
- Is VAT in the price?
- What the cure time is
- How much experience the applicator has