Kent · England
Sand mastic for sash & case windows in Harrietsham, Kent
Our applicators work in Harrietsham on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- A silicone bead on a sash window that spoils the look
- Draughts and rain around sash boxes
- Mastic round period door frames that has failed
Quotes for sand mastic in Harrietsham
You’ll get a clear quote before any work starts. It takes into account:
- Whether old sealant or filler has to be cut out
- Mould in or behind the old joints
- The number of rooms or windows
- Whether the work is at height
Leaving a failed joint generally makes the job bigger, not smaller. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- The problem you’ve noticed
- The address or postcode of the job
- Any previous sealing or DIY work
- Photos by email, if that’s easy
Want a quote for sand mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Sand mastic in Harrietsham
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. We rake it out and renew it so the surround looks right again. If you’re dealing with old cement repairs round a window that have failed and crumbling sand mastic round a window, we can help, on brick reveals, tenement windows and period & listed homes alike.
Many houses in smaller places like Harrietsham have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
All our work comes with our one-year guarantee.
- Location
- Harrietsham (ME17)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Towns and villages near Harrietsham
Also in Harrietsham
What sand mastic looks like in Harrietsham
Rainfall in the South East is lower than in much 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 Leeds Castle (about 2.2 miles west) nearby, there’s older building stock in the area around Harrietsham as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Harrietsham Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Harrietsham station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near Catholic Church of the Good Shepherd, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Harrietsham is about 7 miles east of Maidstone, in Kent. From the centre of Harrietsham to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Kent coverage runs to 922 places, and Harrietsham is one of them. For nearby work, see our Chelmsford page, about 35 miles away.
Here we cover the ME17 postcode area for sand mastic. If you need sand mastic at a property on Church Road, Station Road and Norris Walk or a nearby road, our applicators can take on the job. Close by, we work in Marley (1 mile east), Pollhill (1 mile west), Chegworth (1 mile west), Sandway (1 mile south-east) and Platt's Heath (1 mile south). Within a short drive, we also cover Maidstone (7 miles west), Ashford (11 miles south-east), Sittingbourne (7 miles north), Faversham (10 miles north-east), Minster (13 miles north-east) and Kings Hill (12 miles west).
Near you in Harrietsham
Locally, jobs take us to homes and businesses close to Kiln Wood, The Lenham School and The Roebuck Public House, among other places. There’s a railway station in Harrietsham itself: Harrietsham station. Nearby you will also find The Dog Collar Museum (2.1 miles west) and Leeds Castle (2.2 miles west).
Aftercare tips
Good habits help new joints last longer. Our tips:
- Check the mastic when you check the paintwork
- Avoid heavy scraping on the mastic joint
- Keep sills and gutters clear so water drains away
- Do not paint over the new mastic
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.
Landlords, agents and businesses in Harrietsham
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
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.
Honest limits
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Timber that has rotted
- Whether work needs listed building consent
- Sashes that rattle, stick or will not open
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Sash and case windows
- Stone surrounds
- Brick reveals
- Tenement windows
- Timber door frames
- Period & listed homes
Leave it or put it right?
Cement-based fillers and modern sealants do not always suit a period surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. Homes in smaller places like Harrietsham can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
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 play a part.
Why us?
- Any old sealant cut out fully, not covered over
- 180+ five-star Google reviews
- Anti-fungal silicone where joints get wet
- Fully insured
How the visit works
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to a full day, depending on how many windows. In a smaller place like Harrietsham, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we are working on
- Keep children and pets away from the work area
Ask for a quote
For sand mastic in Harrietsham, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Read more
Harrietsham questions
I let a flat near Harrietsham station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Can you do sand mastic in Harrietsham?
Yes, Harrietsham is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll send you a clear quote.
What exactly is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and shaped to suit the surround.
How long does sand mastic take?
It depends on the size of the job, but as a guide it takes a few hours for a single window, longer for several. We’ll tell you when we quote.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will talk you through it.
Should I use sand mastic or silicone?
That depends on your windows. On many period windows, sand mastic looks right and suits the building, while modern frames normally get a flexible sealant.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.