Kent · England
Sand mastic for sash & case windows in Walmer, Kent
Our applicators work in Walmer on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Modern sealant on a period surround
- Cracked mastic round a front door frame
- Patchy fillers round a sash window
When to call us in Walmer
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 when they notice one of these:
- Draughty sash windows at the surround
- Crumbling sand mastic round a window
- Mastic that needs renewing before redecorating
- Gaps where the frame meets the masonry
Managing a site like The Downs Church of England Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- How much experience the applicator has
- Are they insured?
- What happens if the job turns out different
- How long the guarantee is
Sand mastic for homes and businesses in Walmer
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. If you have tired mastic found when preparing windows for paint and wind and rain getting in round a sash window, we can help, whatever the surface.
Houses in smaller places like Walmer can stand more in the open than those in a built-up town. That’s hard on the mastic around frames and sills.
We stand behind the work with a one-year guarantee.
- Place
- Walmer (CT14)
- Wider area
- Kent
- Cover
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Walmer
Do you cover smaller places like Walmer?
Yes, Walmer is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Does the coastal weather in Walmer affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. All the old silicone is removed first so the mastic beds in well.
Do the sealants smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Do you work for letting agents?
Yes, often. Several properties can be quoted together.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Sand mastic in Walmer: local notes
Walmer is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Historic houses like Walmer Castle (about 0.3 miles south-east) are a reminder that the area around Walmer 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.
For an older house near a landmark such as St Mary's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Walmer station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Walmer is about 6 miles north-east of Dover, in Kent. Wherever you are in the CT14 postcode area, our applicators can take on sand mastic. Across Kent, we cover 922 places, Walmer among them. We also work in Chelmsford, around 54 miles away.
Here we cover the CT14 postcode area for sand mastic. Whether your property is on Lawn Road, York Road and Grams Road or a nearby road, our applicators can take on the job. Walmer sits on or near the A258, so getting to you is simple. Other places close to Walmer include Deal (1 mile north), Mill Hill (1 mile north-west), Great Mongeham (2 miles north-west), Sholden (2 miles north-west) and Ripple (2 miles west). Larger places within reach include Canterbury (15 miles west), Margate (12 miles north), Dover (6 miles south-west), Folkestone (13 miles south-west), Ramsgate (9 miles north) and Broadstairs (11 miles north).
What’s near Walmer
In Walmer, that means homes and buildings near Goodwin Academy and The Telegraph pub and the streets around them. The nearest railway station is Walmer station, about 0.7 miles west. Well-known places in the area include Kent Museum of the Moving Image (1.4 miles north) and Walmer Castle (within half a mile south-east).
What affects the quote in Walmer
You will get a clear quote before we start. It takes into account:
- The number of rooms or windows
- How easy the joints are to reach
- When we can work, for business premises
- How much there is to do
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Helping us quote
When you call or email, these details help:
- The address or postcode of the job
- A few pictures by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Places near Walmer
What else we do in Walmer
What we cannot put right
It helps to know what we cannot do:
- Putty and glazing repairs
- Whether work needs listed building consent
- Rotten sashes, sills or window boxes (a joiner’s job)
If you’re not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Stone surrounds
- Tenement windows
- Brick reveals
- Timber door frames
- Sash and case windows
- Period & listed homes
How the job changes by surface
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we’ll confirm access.
Stone surrounds
We take care not to mark the stone while raking out the old mastic.
What happens if it’s left?
New sash windows are a major, costly change and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. Homes in smaller places like Walmer can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why Walmer clients choose us
- Trusted Arbo and Everbuild sealants
- 4.9 on Google from 180+ five-star reviews
- We never seal over old sealant
- Homes, businesses and hotels
See our cost guide and customer reviews.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Avoid heavy scraping on the mastic joint
- Inspect the joints round the windows every year or so
- Avoid patching sand mastic with silicone
- Leave the new mastic unpainted
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
What happens on the day
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to a full day, depending on how many windows. Parking around Walmer is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- 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.
Getting ready for the visit
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
- Tell us about any previous sealing or DIY attempts
Ask for a quote
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 add pictures by email if you can.