Kent · England
Lashenden Sand Mastic
Professional sand mastic in and around Lashenden, with old sealant always removed completely and a 12-month guarantee.
- Mastic worn away on windows facing the weather
- Mastic that needs renewing before redecorating
- Old cement repairs round a window that have failed
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours per window, depending on the condition of the joints. Somewhere like Lashenden needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
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About our sand mastic in Lashenden
Sand mastic has long been used to fill the joint between timber frames and masonry. 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 are dealing with mastic worn away on windows facing the weather and window mastic to renew ahead of painting, we can put it right.
Mastic can only go onto a dry, clean joint, so window work in Lashenden is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Big or small, you get the same 12-month guarantee.
- Location
- Lashenden (TN27)
- Wider area
- Kent
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Common questions in Lashenden
Do you cover Lashenden for sand mastic?
Yes. Our work covers London and the South East, and Lashenden is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
I let a flat near Headcorn station. Can you help?
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. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
Are you fully insured?
Yes. We are fully insured.
How long does sand mastic take?
It depends on the size of the job, but as a guide it takes a few hours for a single window, longer for several. We will tell you when we quote.
How much does sand mastic cost in Lashenden?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or drop us an email with a short description of the job.
What affects the cost of sand mastic
The price is agreed before any work begins. It’s based on:
- The number of rooms or windows
- Which sealant suits the joint
- When we can work, for business premises
- How easy the joints are to reach
What you pay reflects the work, not guesswork. That is why we ask about the job first.
Asking for a quote
There’s no need for technical detail. Just tell us:
- The rough size of the job
- Access, such as stairs, a lift or height
- The address or postcode of the job
- If someone has resealed it before
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 photos by email if you can.
Places near Lashenden
Other services in Lashenden
Lashenden homes and the weather
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Headcorn station, older sash windows in a rental need their mastic kept sound to keep the weather out. In and around Lashenden, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Lashenden is about 10 miles west of Ashford, in Kent. Every kind of property in Lashenden is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. Lashenden is one of 922 places in Kent where we work. You can also see our page for Crawley, about 36 miles away.
Work in TN27 is quoted and booked the same way as anywhere else. Whether your property is on Bell Lane and Frittenden Road or anywhere close by, we can help. We also cover the places around Lashenden: Standen (1 mile south-east), Curteis' Corner (1 mile south), Monk's Hill (1 mile east), Hareplain (2 miles south-west) and Smarden Bell (2 miles north-east). Larger places within reach include Maidstone (10 miles north-west), Ashford (10 miles east), Sittingbourne (15 miles north), Kings Hill (14 miles north-west), Foley Park (11 miles north-west) and Paddock Wood (11 miles west).
Around Lashenden
The closest station to Lashenden is Headcorn station, roughly 1.8 miles north. A little further out are Kent Firefighting Museum (1.2 miles west) and Romden Castle (2.9 miles east).
Why act early in Lashenden
Not every filler suits an old window surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. In a small place like Lashenden, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
The cost depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Lashenden
- Full insurance on every job
- Tidy, careful work
- Old sealant always removed completely
- More than 20 years in sealant work
Take a look at what affects the cost or our reviews.
Different surfaces, different methods
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is usually favoured.
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Do not run silicone over sand mastic
- Check with your local planning authority if your home is listed
- Sort the mastic before the decorators arrive
- Look over the window mastic once a year
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.