Kent · England
Sand mastic for sash & case windows in New Hythe, Kent
Problem with your window and door surrounds in New Hythe? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Cement or filler used on old window joints that has cracked
- Mastic round period door frames that has failed
- Old sand mastic that has cracked, crumbled or fallen out
How to look after the new joints
Looking after new joints is easy:
- Clear gutters so water does not pour onto the windows
- Ask us before painting near the mastic
- Check the mastic when you check the paintwork
- Check with your local planning authority if your home is listed
Avoid painting over the new mastic, as traditional guidance advises. Ask us before any decorating around it.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens.
About our sand mastic in New Hythe
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It suits period and listed homes where a modern sealant bead would stand out. Common call-outs are for failed mastic on an exposed elevation and draughts and rain around sash boxes, across timber door frames, sash and case windows and tenement windows.
In a village or hamlet like New Hythe, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
All our work comes with a one-year guarantee, wherever you are in Kent.
- Location
- New Hythe (ME20)
- Wider area
- Kent
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Also in New Hythe
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
FAQs for New Hythe
I let a flat near New Hythe station. Can you help?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Do you cover smaller places like New Hythe?
Yes, New Hythe is covered. We work across 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 it possible to paint over sand mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Do the sealants smell?
Some sealants have a smell while they cure. Opening a window helps.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours per window, depending on the condition of the joints. We’ll give you a better idea when we quote.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. All the old silicone is removed first so the mastic beds in well.
What’s sand mastic made of?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Surface by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
What happens on the day
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours per window, depending on the condition of the joints. In a small place like New Hythe, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Let us know about parking restrictions
- Mention any sign-in or site rules at work premises
- Mention any tricky access
How to get a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Read more
What sand mastic looks like in New Hythe
With historic houses such as Starkey Castle (about 3.7 miles north) nearby, there’s older building stock in the area around New Hythe 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. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around Church of the Holy Trinity, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near New Hythe station, any sash windows need sound mastic to keep draughts and rain out.
New Hythe is about 4 miles north-west of Maidstone, in Kent. Homes, rented property, offices and hotels in New Hythe can book us for sand mastic. Every job comes with our one-year guarantee. New Hythe is one of 922 towns and villages in Kent where we work. For nearby work, see our London page (27 miles or so).
Work in ME20 is quoted and booked the same way as anywhere else. Sand mastic is available to properties on Sherwood Avenue, Ingram Close and Abery Drive. We also cover the places around New Hythe: Lunsford (1 mile west), Larkfield (1 mile south-west), Leybourne (1 mile south-west), Eccles (1 mile north-east) and Snodland (1 mile north-west). Within a short drive, we also cover Maidstone (4 miles south-east), Sittingbourne (12 miles east), Dartford (13 miles north-west), Sevenoaks (12 miles west), Royal Tunbridge Wells (14 miles south-west) and Gravesend (9 miles north).
Around New Hythe
We work in homes and buildings around Aylesford School, The Monks Head pub and Leybourne Lakes Country Park and the streets around them. There’s a railway station in New Hythe itself: New Hythe station. Nearby you will also find Maidstone Hospital (2.8 miles south-east) and Medway megaliths (2.1 miles east). Green spaces nearby include Blue Bell Hill and Burham Down.
What we’re called out for in New Hythe
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
People generally contact us after spotting something like this:
- Old cement repairs round a window that have failed
- Gaps between timber frames and stone or brick
- Mastic round period door frames that has failed
- Modern sealant on a period surround
If you look after a building such as Brookfield Junior School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- When the joint can take water or movement
- Which sealant they’ll use, and why
- What guarantee comes with the work
- What preparation is included
How we quote for sand mastic
There’s no set price list, because no two jobs are the same. What we look at:
- Mould in or behind the old joints
- The type of sealant required
- The size of the job
- Access and height
The cost reflects the work involved, not guesswork. That is why we ask about the job first and give you a clear price before any work starts.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- What’s wrong with the joints now
- Any access issues, like height or stairs
- Where the property is
- Whether it has been sealed before
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.