Kent · England
Sand mastic for sash & case windows in Biddenden, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Biddenden. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Cement or filler used on old window joints that has cracked
- Open joints round the window box
- Crumbling sand mastic round a window
Sand mastic for homes and businesses in Biddenden
On many period windows, sand mastic looks right and suits the building. Newer frames normally get a flexible sealant instead, and we will talk through which suits your home. If you are dealing with draughty sash windows at the surround and tired mastic found when preparing windows for paint, we can put it right, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Biddenden is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Big or small, it’s backed by our one-year guarantee in Biddenden and across Kent.
- Where
- Biddenden (TN27)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Avoid heavy scraping on the mastic joint
- Sort the mastic before the decorators arrive
- Get any rot dealt with first
- Keep modern sealant off the mastic
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Do you need sand mastic in Biddenden?
Shallow joints are a common cause. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Any of these means the joints need attention:
- Old cement repairs round a window that have failed
- Weathered mastic on the most exposed windows
- Silicone on a period window that looks wrong
- Gaps where the frame meets the masonry
For site and facilities teams at buildings such as John Mayne Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- Whether all the old sealant comes out first
- What happens if the job turns out different
- How long the guarantee is
- Whether VAT is included
What we do, step by step
The work is kept neat and contained to the joints we are treating. Expect the work to take a few hours for a single window, longer for several, and we tell you how long to leave it before we go. Somewhere as small as Biddenden, access is often the only tricky part. 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.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
Get a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear price before we start.
Related advice
How we quote for sand mastic
Your quote is based on your job. We take into account:
- The type of sealant required
- Whether there’s mould to deal with
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- Pictures of the joints, sent by email
- If someone has resealed it before
- Whether it’s a home or a business
- Where the property is
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
What sand mastic looks like in Biddenden
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Headcorn station, cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to Parish Church of All Saints include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Biddenden is about 10 miles west of Ashford, in Kent. Biddenden gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Biddenden is one of 922 places in Kent where we work for sand mastic. We also work in Crawley, around 36 miles away.
All of TN27 is within our area for sand mastic, from the main roads to the quietest streets. We cover properties on High Street, The Meadows and Cloth Hall Gardens. If you’re just outside Biddenden, we cover Curteis' Corner (1 mile north-east), Woolpack Corner (1 mile south-east), Standen (1 mile north-east), Hareplain (1 mile north-west) and Stede Quarter (1 mile east). Within a short drive, we also cover Maidstone (11 miles north-west), Ashford (10 miles east), Kings Hill (15 miles north-west), Foley Park (12 miles north-west), Paddock Wood (12 miles west) and Tenterden (4 miles south-east).
Landmarks near Biddenden
We work in homes and buildings around The Red Lion Inn, among other places. The closest station to Biddenden is Headcorn station, about 3.5 miles north of the centre. A little further out are Benenden Hospital (2.3 miles south-west) and Sissinghurst Castle (2.6 miles west).
FAQs for Biddenden
Is Biddenden in your area for sand mastic?
Yes, Biddenden is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Do you cover smaller places like Biddenden?
Yes. Biddenden is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Should I use sand mastic or silicone?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant, and we will explain why.
Do I need permission for sand mastic on a listed building?
Checking first is sensible. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
When will the new mastic be hard?
It takes a while. The skin forms first, and the full set comes later and we’ll give you an idea for your job.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
What do you need from me for a quote?
A short description and the location, with pictures by email if possible. We will ask anything else we need to know.
Can you match the sealant colour?
We will suggest a colour to suit the surroundings. The product needed can limit the range.
Other services in Biddenden
How the job changes by surface
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.