Hampshire · England
Sand mastic for sash & case windows in Kentsboro, Hampshire
We cover Kentsboro for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Patchy fillers round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
- Draughty sash windows at the surround
What affects the cost of sand mastic
The price is agreed before any work begins. It takes into account:
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- The size of the job
- Whether there’s mould to deal with
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
When you call or email, these details help:
- Whether it’s a home or a business
- Whether it has been sealed before
- The address or postcode of the job
- What’s wrong with the joints now
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
Sand mastic in Kentsboro
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. Typical jobs include mastic round period door frames that has failed and wind and rain getting in round a sash window, across timber door frames, period & listed homes and sash and case windows.
Around Kentsboro, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Location
- Kentsboro (SO20)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Kentsboro homes and the weather
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Grateley station? Then any sash windows need sound mastic to keep draughts and rain out.
Kentsboro is about 5 miles south-west of Andover, in Hampshire. For sand mastic in and around Kentsboro, please phone 0345 464 0079 or email us for a quick quote. We cover Hampshire from our Crawley base, Kentsboro included. Kentsboro is one of 683 places in Hampshire we cover. We also work in Southampton, around 18 miles away.
Jobs for sand mastic in SO20 works the same way as everywhere else we cover. We cover properties on Mead Park Square, Upper Mead and Lower Mead. We also cover the places around Kentsboro: Over Wallop (2 miles south-west), Middle Wallop (2 miles south-west), Nether Wallop (2 miles south), Fox (2 miles north) and Red Rice (2 miles north-east). We also work in nearby towns such as Winchester (13 miles south-east), Andover (5 miles north-east), Chandler's Ford (14 miles south-east), Romsey (12 miles south), Hyde (12 miles south-east) and Tidworth (7 miles north-west).
What’s near Kentsboro
The closest station to Kentsboro is Grateley station, roughly 2.6 miles west of the centre. Well-known places in the area include Andover War Memorial Hospital (5 miles north-east). Open spaces near Kentsboro include Quarley Hill and Mill Lake.
What happens on the day
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work starts. The work normally takes a few hours for a single window, longer for several. For a village or hamlet like Kentsboro, the journey is planned in advance: let us know about lanes, gates and parking. 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.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Tell us if parking is tricky
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we’re working on
Getting a quote
If you are in Kentsboro and need sand mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before work begins.
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What we cannot put right
We will always be straight with you, so here’s what sealant can’t fix:
- Planning or listed building consent (your local planning authority decides)
- Rotten sashes, sills or window boxes (a joiner’s job)
- Masonry that needs repairing
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before booking.
Joints and surfaces we work on
- Tenement windows
- Brick reveals
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Timber door frames
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Renew mastic before redecorating the windows
- Check with your local planning authority if your home is listed
- Look over the window mastic once a year
- Have rotten timber repaired before new mastic goes in
Don’t touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
How the job changes by surface
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Places near Kentsboro
What else we do in Kentsboro
Questions from Kentsboro
Is Kentsboro within the area you cover?
Yes, Kentsboro is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
I let a flat near Grateley station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
Which is right for my windows, sand mastic or modern sealant?
We will help you decide. Sand mastic suits many period homes, and modern sealants suit newer frames.
How long does sand mastic take?
A typical job takes anything from a few hours to a full day, depending on how many windows. Your quote will say how long we expect yours to take.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint before the sand mastic goes in.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Do you offer different sealant colours?
Yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.
Do you need sand mastic in Kentsboro?
Shallow joints are a common cause. A thin layer does not hold well, which is why we pack deep voids first and get the depth right.
Signs it’s time to call us include:
- A silicone bead on a sash window that spoils the look
- Mastic worn away on windows facing the weather
- Draughty sash windows at the surround
- Mastic that needs renewing before redecorating
In and around Kentsboro, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
What your quote should include
- Which sealant they’ll use, and why
- How the surfaces are prepared before sealing
- How much experience the applicator has
- Whether you can choose the colour