Kent · England
Sand Mastic in Underling Green
Sand mastic for Underling Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
Sand mastic for homes and businesses in Underling Green
We work across Underling Green renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. If you have mastic round period door frames that has failed and draughts and rain around sash boxes, we can help.
Outdoor sealant needs dry, clean surfaces, so work on frames around Underling Green is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Underling Green (TN12)
- Region
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Do not paint over the new mastic
- Don’t run silicone over sand mastic
- Have rotten timber repaired before new mastic goes in
- Look over the window mastic once a year
Leave the new mastic alone while it firms up. It skins over quickly, but takes longer to harden fully.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for property managers and facilities teams in Underling Green and across Kent. We can quote a run of properties together, and we’re fully insured for the work.
Your questions about sand mastic in Underling Green
Do you work for landlords with property near Marden station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Do you cover Underling Green for sand mastic?
Yes, Underling Green is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
When will the new mastic be hard?
A skin forms quite soon, but full hardening takes longer. We will explain what to expect before we leave.
Can you replace silicone on a period window with sand mastic?
Generally, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
How long will you be here?
Most jobs take a few hours for a single window, longer for several, including the preparation. Your quote will say how long we expect yours to take.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
Is the work guaranteed?
You get our 12-month guarantee on every job.
Different surfaces, different methods
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Underling Green homes and the weather
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. With historic houses such as Stoneacre (about 5 miles north-east) nearby, there’s older building stock in the area around Underling Green as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Historic houses such as Stoneacre, about 5 miles north-east, show how far back building around Underling Green goes.
Underling Green is about 5 miles south of Maidstone, in Kent. Jobs in Underling Green get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 922 places across Kent. We also work in Crawley, around 31 miles away.
Every address in TN12 is within our area for sand mastic. We also cover the places around Underling Green: Milebush (1 mile south-west), St Ann's Green (1 mile south), Wanshurst Green (1 mile south), Cross-at-Hand (1 mile east) and Rabbit's Cross (2 miles east). We also work in nearby towns such as Maidstone (5 miles north), Sittingbourne (14 miles north-east), Sevenoaks (15 miles north-west), Royal Tunbridge Wells (11 miles west), Tonbridge (10 miles west) and Kings Hill (7 miles north-west).
Around Underling Green
The nearest railway station is Marden station, roughly 1.5 miles south-west of the centre. A little further out are Oakwood Hospital (5.5 miles north) and South East Romany Museum (1.3 miles south).
Nearby places to Underling Green
Other services in Underling Green
Why deal with it now?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. In a small place like Underling Green, 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, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Why book with us
- More than 20 years in sealant work
- Trusted Arbo and Everbuild sealants
- An ARBOMaster approved applicator
- We never seal over old sealant
Take a look at how sealant jobs are priced or customer reviews.
Honest limits
A few problems are outside what sealant work can do:
- Masonry that needs repairing
- Sashes that rattle, stick or will not open
- Cracked or broken glass
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
What we seal
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows
What happens on the day
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours per window, depending on the condition of the joints. Somewhere as small as Underling Green, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Mention any parking rules near the property
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
Getting a quote
Need a quote? Please phone 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear quote before any work starts.
Read more
When to call us in Underling Green
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
These are the problems we’re asked about most:
- Weathered mastic on the most exposed windows
- Open joints round the window box
- A silicone bead on a sash window that spoils the look
- Old sand mastic that has cracked, crumbled or fallen out
For landlords with property near Marden station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Before booking anyone
- What the cure time is
- How long the guarantee is
- Who does the work, and how experienced they are
- How the surfaces are prepared before sealing