Kent · England
Sand mastic for sash & case windows in Martin, Kent
Sand mastic for Martin, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic that needs renewing before redecorating
- Mastic round period door frames that has failed
- A silicone bead on a sash window that spoils the look
Surface by surface
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
About our sand mastic in Martin
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. We work on timber door frames, brick reveals and period & listed homes, and people most often call us about tired mastic found when preparing windows for paint and gaps round a timber door in stone or brick.
In a village or hamlet like Martin, 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.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Martin (CT15)
- Region
- Kent
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
At the end, we look at the finished work together and tell you how long to leave it. The visit itself usually takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. For a village or hamlet like Martin, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Let us know if you’ve seen damp or leaks
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
Get a quote
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or email us and describe the job, and photos are welcome.
Related advice
FAQs for Martin
Can you help a landlord with a rental near Martin Mill station?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Is Martin within the area you cover?
Yes. Martin 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.
Is consent needed for window work on a listed home?
Your local planning authority is the one to ask. They’ll tell you if consent is needed for work to your windows.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
What exactly is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
How long does sand mastic take?
That depends on how much there is to do, but as a guide it takes a few hours per window, depending on the condition of the joints. We will tell you when we quote.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
Why deal with it now?
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new work lasts. Older cottages and farmhouses around Martin can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
Why choose Mr Mastic in Martin
- One-year guarantee on every job
- Rated 4.9 stars on Google
- We never seal over old sealant
- We’re fully insured
Read what affects the cost or our reviews.
More services for Martin
What affects the quote in Martin
We don’t publish a price list. What we look at:
- Access and height
- Which sealant suits the joint
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
What to tell us for a quote
You do not need to know the technical terms. It helps if you can tell us:
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
- The address or postcode of the job
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Check with your local planning authority if your home is listed
- Ask us before painting near the mastic
- Have rotten timber repaired before new mastic goes in
- Look over the window mastic once a year
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber and timber that stays wet can rot.
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Frames and glazing around Martin
Martin is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around older windows and doors, especially on the side facing the sea. Historic houses like Walmer Castle (about 3 miles north-east) are a reminder that the area around Martin has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Church of St Augustine, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Martin Mill station, any sash windows need sound mastic to keep draughts and rain out.
Martin is about 3 miles north-east of Dover, in Kent. From the centre of Martin to the outskirts, sand mastic is available for homes and businesses alike. 922 places in Kent are on our list. There’s also a page for Chelmsford, about 54 miles away.
Every address in CT15 is within our area for sand mastic, from the main roads to the quietest streets. Local streets include The Street, Waterworks Lane and Ringwould Road. Neighbouring places we cover for sand mastic include Martin Mill (1 mile south-east), East Langdon (1 mile south-west), West Langdon (1 mile west), Ringwould (1 mile north-east) and Sutton (1 mile north). We also work in nearby towns such as Canterbury (13 miles north-west), Margate (14 miles north), Dover (3 miles south-west), Folkestone (10 miles south-west), Ramsgate (12 miles north) and Broadstairs (13 miles north).
Landmarks near Martin
Around Martin, our work takes us to homes and buildings near The Lantern Inn and Duke of York's Royal Military School, among other places. There’s a railway station in Martin itself: Martin Mill station. A little further out are Royal Victoria Hospital (3.6 miles south-west) and St Margaret's Museum (2.5 miles south-east). Open spaces near Martin include Dover Western Heights.
Signs you need sand mastic in Martin
Timber frames move with the seasons. That movement opens up the mastic joint over time.
Any of these means the joints need attention:
- Cracked mastic round a front door frame
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
- Mastic dropping out of the joint
If you look after a building such as Langdon Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before booking
- Who turns up on the day
- Are they insured?
- Which colour the sealant will be
- What happens if they find a problem under the old sealant