Kent · England
Sand mastic for sash & case windows in Greenhill, Kent
Problem with your window and door surrounds in Greenhill? We remove the old material, prepare the joints and seal them properly.
- Old sand mastic that has cracked, crumbled or fallen out
- Weathered mastic on the most exposed windows
- Window mastic to renew ahead of painting
About our sand mastic in Greenhill
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. If you are dealing with old cement repairs round a window that have failed and draughty sash windows at the surround, we can put it right.
In smaller places like Greenhill, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
A one-year guarantee comes as standard, so you’re covered after we’ve gone.
- Place
- Greenhill (CT6)
- Wider area
- Kent
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. Around Greenhill, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- Full insurance on every job
- Approved under the ARBOMaster scheme
- We never seal over old sealant
- A 12-month guarantee on all work
Read what affects the cost or what customers say.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Avoid patching sand mastic with silicone
- Renew mastic before redecorating the windows
- Check with your local planning authority if your home is listed
- Ask a joiner to look at soft timber first
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
Also near Greenhill
More services for Greenhill
FAQs for Greenhill
Will you come out to Greenhill?
Yes. Greenhill 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.
Does the coastal weather in Greenhill affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it messy?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or drop us an email.
How much does sand mastic cost in Greenhill?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we’ll talk you through it.
Do you guarantee sand mastic work?
Our one-year guarantee covers every job.
How long does the job take?
A typical job takes anything from a few hours to a full day, depending on how many windows, including the preparation. Your quote will say how long we expect yours to take.
What we do, step by step
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. The job generally takes anything from a few hours to a full day, depending on how many windows. For a job in Greenhill, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Tell us if parking is tricky
- For indoor joints, keep the area dry beforehand if you can
- Let us know if you’ve seen damp or leaks
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, phone 0345 464 0079 or email us.
Read more
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
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 does not work out, we can still put it right.
How the job changes by surface
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Stone surrounds
We take care not to mark the stone while raking out the old mastic.
Landlords, agents and businesses in Greenhill
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Landlords and letting agents in Greenhill can book us as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
What we can’t put right
We will not take on work that won’t last, so these are the limits:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Planning or listed building consent (your local planning authority decides)
- Damaged stone surrounds
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Sash and case windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Tenement windows
- Stone surrounds
Greenhill homes and the weather
Greenhill is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around older windows and doors, especially on the side facing the sea. 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.
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. Rented homes near Herne Bay station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. If you look after a building such as Thornden Wood Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Greenhill is about 1 mile south-west of Herne Bay, in Kent. Greenhill gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 922 places in Kent are on our list. There’s also a page for Chelmsford, about 37 miles away.
Postcode districts we cover here for sand mastic: CT6. Streets in the area include Love Street Close, Herne Drive and Matthews Road, and we cover them all. We also cover Eddington (1 mile east), Bullockstone (1 mile south-east), Herne Common (1 mile south-east), Herne Bay (1 mile north-east) and Herne (1 mile south-east). Further out, we also cover Canterbury (6 miles south), Margate (12 miles east), Ramsgate (13 miles east), Broadstairs (14 miles east), Whitstable (3 miles west) and Faversham (10 miles west).
Landmarks near Greenhill
In Greenhill, that means homes and buildings near The Share And Coulter Public House, Curtis Wood and Herne Bay High School, among other places. The nearest railway station is Herne Bay station, roughly 0.6 miles north-east of the centre. Well-known places in the area include Whitstable and Tankerton Hospital (2.4 miles west) and Tankerton Castle (3.1 miles west). The countryside around Greenhill includes West Blean and Thornden Woods.