Kent · England
Sand mastic for sash & case windows in Stocks Green, Kent
Sand mastic for Stocks Green and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Mastic worn away on windows facing the weather
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
When to call us in Stocks Green
Timber frames move with the seasons. The movement cracks the mastic little by little.
Common reasons people contact us are:
- Cracked mastic round a front door frame
- Gaps between timber frames and stone or brick
- Mastic that needs renewing before redecorating
- Old sand mastic that has cracked, crumbled or fallen out
In the older streets around Parish Church of St John, the joint between an old wall and a newer frame is normally the first place rain gets in.
What your quote should include
- What the quote includes, VAT included or not
- What happens if the job turns out different
- Whether all the old sealant comes out first
- When the joint can take water or movement
About our sand mastic in Stocks Green
We work across Stocks Green renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. Common call-outs are for old cement repairs round a window that have failed and mastic dropping out of the joint, across timber door frames, sash and case windows and stone surrounds.
Somewhere as small as Stocks Green, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
A 12-month guarantee comes as standard, so you are covered after we have gone.
- Location
- Stocks Green (TN11)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Stocks Green
What else we do in Stocks Green
How the job changes by 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.
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Landlords, agents and businesses in Stocks Green
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured for the work.
Common questions in Stocks Green
Is Stocks Green in your area for sand mastic?
Yes. Our work covers London and the South East, and Stocks Green is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
Can you help a landlord with a rental near Hildenborough station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
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.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They’ll tell you if consent is needed for work to your windows.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Ask a joiner to look at soft timber first
- Do not paint over the new mastic
- Don’t run silicone over sand mastic
- Clear gutters so water doesn’t pour onto the windows
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
What we cannot put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Sash cords, weights and draught-proofing of the sashes
- Whether work needs listed building consent
- Timber that has rotted
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Timber door frames
- Brick reveals
- Tenement windows
- Sash and case windows
- Period & listed homes
- Stone surrounds
Why it’s worth doing now in Stocks Green
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. In a small place like Stocks Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What you get with us
- Rated 4.9 stars on Google
- More than 20 years in sealant work
- An ARBOMaster approved applicator
- Full insurance on every job
Read our cost guide or what customers say.
Stocks Green homes and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Penshurst Place (about 3.2 miles south-west) nearby, there’s older building stock in the area around Stocks Green as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Rented homes near Hildenborough station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Managing a site like Hildenborough Church of England Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Stocks Green is about 2 miles north-west of Tonbridge, in Kent. Wherever you are in the TN11 postcode area, we can carry out sand mastic at your property. Across Kent, we cover 922 places, Stocks Green among them. For nearby work, see our Crawley page, about 19 miles away.
All of TN11 is covered for sand mastic. If you’re just outside Stocks Green, we cover Hildenborough (1 mile north-east), Watt's Cross (1 mile north), Hilden Park (1 mile east), Coldharbour (2 miles north-east) and Underriver (3 miles north). Further out, we also cover Maidstone (13 miles east), Sevenoaks (5 miles north), Royal Tunbridge Wells (5 miles south), Swanley (13 miles north), Kings Hill (9 miles north-east) and Foley Park (14 miles east).
Near you in Stocks Green
In Stocks Green, that means homes and buildings near The Judd School, The Flying Dutchman Public House and Haysden Country Park, among other places. Stocks Green has its own railway station: Hildenborough station. Nearby you’ll also find Tonbridge Cottage Hospital (2.9 miles south-east) and The Milne Museum (2 miles south-east). Open spaces near Stocks Green include Barden Lake and Tudeley Woods RSPB reserve.
What happens on the day
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours for a single window, longer for several. In a small place like Stocks Green, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
- Mention any sign-in or site rules at work premises
Getting a quote
We do not publish a price list, because every job is different. Instead, we give you a clear price for your job. To get started, call 0345 464 0079 or email us.