Kent · England
Sand mastic for sash & case windows in Sandhurst, Kent
Our applicators work in Sandhurst on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Patchy fillers round a sash window
- Draughts and rain around sash boxes
- Mastic round period door frames that has failed
Sand mastic in Sandhurst
Across Sandhurst, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand for a neat, traditional finish. If you’re dealing with a silicone bead on a sash window that spoils the look and window mastic to renew ahead of painting, we can put it right.
In a village or hamlet like Sandhurst, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Each job carries a 12-month guarantee, large or small.
- Place
- Sandhurst (TN18)
- Region
- Kent
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Make sure water runs off the sill
- Ask a joiner to look at soft timber first
- Find out about consent before window work on a listed home
- Do not run silicone over sand mastic
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Sandhurst: your questions answered
Can you help a landlord with a rental near Robertsbridge station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Can you do sand mastic in Sandhurst?
Yes. We work across London and the South East, and Sandhurst is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Can I paint the new mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Is consent needed for window work on a listed home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or send us an email.
Do you offer different sealant colours?
Yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before we start.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Also near Sandhurst
What else we do in Sandhurst
Landlord and commercial work in Sandhurst
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured for the work.
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Working hours on commercial sites
- Which sealant suits the joint
- How much there is to do
- Any mould that needs treating
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- Any previous sealing or DIY work
- Whether it’s a home or a business
- Where the job is, and your postcode
- The rough size of the job
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or drop us an email.
Leave it or put it right?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and blends with the stone or brick. In a small place like Sandhurst, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Call for a quick quote and we’ll go through it with you.
Why book with us
- Tidy, careful work
- We are fully insured
- Old sealant always removed completely
- Homes, businesses and hotels
See our cost guide and our reviews.
Surface by surface
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Timber door frames
Doors face weather and wear and the mastic can crack early. We rake it out and renew it.
What happens on the day
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we tell you how long to leave it before we go. In a small place like Sandhurst, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
- Let us know if you’ve seen damp or leaks
Getting a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Read more
Signs you need sand mastic in Sandhurst
Most of it is simply age. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
These are the problems we’re asked about most:
- Mastic that needs renewing before redecorating
- Modern sealant on a period surround
- Patchy fillers round a sash window
- Mastic dropping out of the joint
Homes close to Mission Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Before booking anyone
- What guarantee comes with the work
- What product goes in the joint
- Who turns up on the day
- What insurance they hold
Windows and doors in Sandhurst
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. Historic houses like Great Dixter (about 2.4 miles south-east) are a reminder that the area around Sandhurst has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Sandhurst Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Robertsbridge station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Sandhurst is about 11 miles north of Hastings, in Kent. If you need sand mastic in Sandhurst, please call 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Kent. 922 places in Kent are on our list, large and small. There’s also a page for Crawley, about 33 miles away.
Here we cover the TN18 postcode area for sand mastic. Streets in the area include Bodiam Road, Poundfield Road and Queen Street, all of which we cover. Other places close to Sandhurst include Sandhurst Cross (1 mile south-west), Linkhill (1 mile east), Four Throws (2 miles north-west), Little Conghurst (2 miles north-west) and Bodiam (2 miles south-west). Larger places within reach include Ashford (15 miles north-east), Royal Tunbridge Wells (15 miles north-west), Paddock Wood (13 miles north-west), Tenterden (6 miles north-east), Park Wood (15 miles north) and Staplehurst (10 miles north).
Landmarks near Sandhurst
Around Sandhurst, our work takes us to homes and buildings near Sentido pub and the streets around them. The nearest railway station is Robertsbridge station, roughly 4.9 miles south-west. Well-known places in the area include The C.M Booth Collection (3.5 miles north-east) and Benenden Hospital (4.8 miles north-east).