Kent · England
Sand mastic for sash & case windows in Newtown, Kent
Specialist sand mastic for Newtown: careful preparation, the right product and tidy work. Call for a quick quote.
- Mastic round period door frames that has failed
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
Frames and glazing around Newtown
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. Historic houses like Godinton House (about 2.9 miles north-west) are a reminder that the area around Newtown has older buildings as well as new. In older buildings, 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 Christ Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Ashford International station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. Managing a site like East Stour Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Newtown is about 1 mile south-east of Ashford, in Kent. We carry out sand mastic for homes and businesses in Newtown and the surrounding area, as part of our work across Kent. Our area takes in 922 places across Kent. For nearby work, see our Chelmsford page (45 miles or so).
Our applicators cover all of the TN24 and TN23 postcode area for sand mastic and the streets around it. Local streets include Bath Road, Mead Road and Royds Road, all of which we cover. If you are just outside Newtown, we cover South Willesborough (1 mile north-east), Park Farm (1 mile south-west), Willesborough (1 mile north-east), Ashford (1 mile north-west) and Finberry (1 mile south-east). Further out, we also cover Canterbury (14 miles north-east), Folkestone (13 miles east), Faversham (13 miles north), Hythe (10 miles south-east), Davington (13 miles north) and Preston (12 miles north).
Landmarks near Newtown
We work in homes and buildings around The North School, The Albion Inn and Ashford Green Corridors. The closest station to Newtown is Ashford International station, about 0.9 miles north of the centre. A little further out are Ashford Designer Outlet (0.5 miles north) and William Harvey Hospital (1.7 miles north-east). Open spaces near Newtown include Hatch Park.
Sand mastic in Newtown, done properly
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. We work on timber door frames, tenement windows and stone surrounds, and the jobs we see most are wind and rain getting in round a sash window and open joints round the window box.
Many houses in smaller places like Newtown have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
All our work comes with our one-year guarantee.
- Place
- Newtown (TN24, TN23)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the quote in Newtown
You will get a clear quote before any work starts. It takes into account:
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email and we’ll talk you through it.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- The rough size of the job
- The type of property
- How we’d reach the joints
- Where the property is
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work.
What happens if it’s left?
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new mastic stays put. Around Newtown, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
What it costs depends on the amount of work, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Why book with us
- More than 20 years in sealant work
- Sanitary silicone with an anti-fungal additive in wet areas
- Full insurance on every job
- An ARBOMaster approved applicator
Places near Newtown
Other services in Newtown
Newtown questions
Do you cover smaller places like Newtown?
Yes. Newtown is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Ashford International station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can phone 0345 464 0079 or email us with the details for a clear quote.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can you replace silicone on a period window with sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
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.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Newtown.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
How long does the job 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’ll give you a better idea when we quote.
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- Crumbling stone or brickwork round the window
- Timber that has rotted
- Broken panes
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Newtown
- Tenement windows
- Timber door frames
- Sash and case windows
- Brick reveals
- Stone surrounds
- Period & listed homes
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Look over the window mastic once a year
- Go gently near the mastic when preparing windows
- Make sure water runs off the sill
- Leave the new mastic unpainted
Avoid painting over the new mastic, as traditional guidance advises. Ask us before any decorating around it.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber, which can lead to rot.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Landlords, agents and businesses in Newtown
Landlords and agents in Newtown can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
How the visit works
When we arrive, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before work begins. The work normally takes a few hours for a single window, longer for several. Parking around Newtown 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.
- 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.
Preparing for the visit
- Tell us about any water getting in
- Mention if the joints have been sealed before
- Clear items away from the joints we are working on
How to get a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.