Kent · England
Sandwich Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Sandwich. Fully insured, ARBOMaster approved and guaranteed for a year.
- Window mastic to renew ahead of painting
- Patchy fillers round a sash window
- Mastic worn away on windows facing the weather
What happens if it’s left?
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. Around Sandwich, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- We are fully insured
- Trusted Arbo and Everbuild sealants
- Tidy, careful work
- 12-month guarantee on every job
Take a look at our cost guide or what customers say.
About our sand mastic in Sandwich
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, applied by hand. On period homes, it looks right where silicone wouldn’t. If you have mastic worn away on windows facing the weather and mastic dropping out of the joint, we can put it right.
Homes around Sandwich range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
Every job is covered by a 12-month guarantee.
- Location
- Sandwich (CT13)
- Region
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we will confirm what’s needed.
Nearby places to Sandwich
What else we do in Sandwich
Sandwich questions
Is Sandwich within the area you cover?
Yes, Sandwich is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Sandwich station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What does sand mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will advise.
How long does sand mastic take to harden?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Landlord and commercial work in Sandwich
Housing providers, facilities teams and property managers book us too in Sandwich and across Kent. We can quote a run of properties together, and we’re fully insured.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
The process
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes a few hours per window, depending on the condition of the joints in most cases. For a job in Sandwich, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Clear the area around the work
- 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
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, ring 0345 464 0079 or drop us an email.
Advice
Sand mastic in Sandwich: local notes
Sandwich is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around older windows and doors, especially on the side facing the sea. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Sandwich station, older sash windows in a rental need their mastic kept sound to keep the weather out. Schools such as Sandwich Infant School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Sandwich is about 5 miles north-west of Deal, in Kent. Jobs in Sandwich get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Sandwich is one of 922 towns and villages in Kent we cover for sand mastic. Chelmsford is on our list too, about 49 miles from Sandwich.
All of CT13 is within our area for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on Cattle Market, Market Street and High Street or anywhere close by, we can help. Nearby, we also carry out sand mastic in Great Stonar (1 mile north), Felderland (1 mile south), Worth (1 mile south), Woodnesborough (1 mile south-west) and Statenborough (1 mile south-west). Larger places within reach include Canterbury (11 miles west), Margate (8 miles north), Dover (10 miles south), Folkestone (15 miles south-west), Ramsgate (5 miles north-east) and Broadstairs (7 miles north-east).
Landmarks near Sandwich
Around Sandwich, our work takes us to homes and buildings near Ham Fen, Sir Roger Manwood's School and The Red Cow Public House. There’s a railway station in Sandwich itself: Sandwich station. Nearby you will also find The Precinct Toy Collection (less than half a mile north) and Ramsgate General Hospital (5 miles north-east). For a walk, there’s Monk's Wall nature reserve.
Keeping the joints in good condition
Looking after new joints is easy:
- Plan mastic work ahead of painting
- Look over the window mastic once a year
- Leave the new mastic unpainted
- Make sure water runs off the sill
Leave the new mastic unpainted, which is the traditional advice. If you’re redecorating, ask us first.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens.
What affects the quote in Sandwich
Every job gets its own quote. These are the things that affect it:
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Whether the work is at height
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Photos by email, if that’s easy
- What’s wrong with the joints now
- The type of property
- Access, such as stairs, a lift or height
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or email us.
When to call us in Sandwich
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Most people get in touch after spotting one of these:
- Weathered mastic on the most exposed windows
- Window mastic to renew ahead of painting
- Mastic dropping out of the joint
- Draughts and rain around sash boxes
Homes close to Sandwich United Reformed Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- Whether you can choose the colour
- How the surfaces are prepared before sealing
- Whether VAT is included
- Whether the sealant suits the joint