Kent · England
Stonehill Green Sand Mastic
Our applicators work in Stonehill Green on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Cement or filler used on old window joints that has cracked
- Open joints round the window box
- Mastic round period door frames that has failed
Sand mastic for homes and businesses in Stonehill Green
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. Typical jobs include failed mastic on an exposed elevation and tired mastic found when preparing windows for paint, on brick reveals, tenement windows and sash and case windows.
Homes in small places like Stonehill Green 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.
Big or small, you get the same one-year guarantee in Stonehill Green and across Kent.
- Place
- Stonehill Green (DA2)
- Region
- Kent
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Looking after new joints is easy:
- Ask the planning authority about consent for listed or conservation-area homes
- Take care around the mastic when scraping paint
- Renew mastic before redecorating the windows
- Inspect the joints round the windows every year or so
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
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.
Towns and villages near Stonehill Green
Also in Stonehill Green
Honest limits
Before booking, it’s worth knowing the limits:
- Broken panes
- Decayed frames that need repair
- Sashes that rattle, stick or will not open
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Stone surrounds
- Tenement windows
- Sash and case windows
- Timber door frames
- Brick reveals
- Period & listed homes
Stonehill Green questions
Is Stonehill Green in your area for sand mastic?
Yes. We work across London and the South East, and Stonehill Green is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Will you come out to Stonehill Green?
Yes, Stonehill Green is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is the work guaranteed?
Our 12-month guarantee covers every job, sand mastic included.
Which is right for my windows, sand mastic or modern sealant?
We’ll help you decide. Period homes often look best with sand mastic and newer frames suit modern sealant.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Can landlords and businesses book you?
Yes, often. Several properties can be quoted together.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few pictures.
What affects the cost of sand mastic
Your quote is based on your job. We take into account:
- Whether there’s mould to deal with
- Working hours on commercial sites
- The size of the job
- The old material and how stubborn it is
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Asking for a quote
When you call or email, it’s useful to know:
- A few pictures by email, if you can
- The type of property
- Any previous sealing or DIY work
- Where the property is
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
How the visit works
We keep the work tidy and contained to the joints we’re treating. The job generally takes a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. Somewhere as small as Stonehill Green, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- 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.
How to prepare
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Let us know if you’ve seen damp or leaks
Getting a quote
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details and send photos if you have them.
Read more
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.
Period and listed homes
Period homes look their best with traditional materials.
When to call us in Stonehill Green
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
It’s worth asking for a quote if you see:
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Draughts and rain around sash boxes
- Old sand mastic that has cracked, crumbled or fallen out
For site and facilities teams at buildings such as Hextable School, larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- Which colour the sealant will be
- Which sealant they’ll use, and why
- What insurance they hold
- How long to leave it before use
Stonehill Green homes and the weather
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. With historic houses such as Hall Place and Gardens (about 2.4 miles north) nearby, there’s older building stock in the area around Stonehill Green as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For landlords with property near Swanley station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near St Peter, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Stonehill Green is about 3 miles south-east of Sidcup, in Kent. Anywhere in DA2, our applicators can take on sand mastic. Our Kent coverage runs to 922 places, Stonehill Green among them. We also work in London, around 13 miles away.
Here we cover the DA2 postcode area for sand mastic. We also cover the places around Stonehill Green: Puddledock (1 mile north-east), Hextable (1 mile east), Joyden's Wood (1 mile north), Hockenden (1 mile south-west) and Upper Ruxley (1 mile west). We also work in nearby towns such as Dartford (3 miles north-east), Sevenoaks (9 miles south), Gravesend (9 miles east), Northfleet (8 miles east), Kings Hill (14 miles south-east) and Swanscombe (6 miles north-east).
What’s near Stonehill Green
Around Stonehill Green, our work takes us to homes and buildings near The Ship pub, Hextable Primary School and Dartford Heath, among other places. The closest station to Stonehill Green is Swanley station, roughly 1.4 miles south. Well-known places in the area include Queen Mary's Hospital (2.8 miles west) and Eynsford Castle (3.6 miles south-east). Open spaces near Stonehill Green include Summer Hill and The Warren.