Hampshire · England
Sand mastic for sash & case windows in Carter's Clay, Hampshire
Problem with your window and door surrounds in Carter's Clay? We cut out the old, prepare the joints and apply the right sealant.
- Weathered mastic on the most exposed windows
- Old cement repairs round a window that have failed
- Mastic round period door frames that has failed
What affects the quote in Carter's Clay
You’ll get a clear quote before we start. It takes into account:
- Working hours on commercial sites
- Which sealant suits the joint
- How much there is to do
- The old material and how stubborn it is
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
- The address or postcode of the job
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
How we handle sand mastic in Carter's Clay
Silicone on a period window often looks wrong and isn’t always the right material. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on timber door frames, tenement windows and brick reveals, and common reasons people get in touch are failed mastic on an exposed elevation and gaps between timber frames and stone or brick.
Mastic can only go onto a dry, clean joint, so window work in Carter's Clay is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Carter's Clay (SO51)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours per window, depending on the condition of the joints. Somewhere as small as Carter's Clay, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
- Clear items away from the joints we are working on
How to get a quote
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
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Common questions in Carter's Clay
Do you work for landlords with property near Mottisfont & Dunbridge station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Will you come out to Carter's Clay?
Yes, Carter's Clay is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will advise.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we are done.
Do I need permission for sand mastic on a listed building?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
What should I tell you?
Tell us what needs doing and where. If we need more, we will ask.
Places near Carter's Clay
What else we do in Carter's Clay
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
What we can’t put right
We won’t take on work that will not last, so these are the limits:
- Decayed frames that need repair
- Sashes that need overhauling
- Whether work needs listed building consent
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Stone surrounds
- Brick reveals
- Timber door frames
- Tenement windows
- Sash and case windows
- Period & listed homes
Keeping the joints in good condition
So the new joints stay in good condition:
- Renew mastic before redecorating the windows
- Have rotten timber repaired before new mastic goes in
- Keep sills and gutters clear so water drains away
- Look over the window mastic once a year
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
What sand mastic looks like in Carter's Clay
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Mottisfont Abbey (about 1.9 miles north-east) nearby, there’s older building stock in the area around Carter's Clay 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’s traditional sand mastic.
If you let a flat or house near Mottisfont & Dunbridge station, any sash windows need sound mastic to keep draughts and rain out. Historic houses such as Mottisfont Abbey, about 1.9 miles north-east, show how far back building around Carter's Clay goes, and older homes nearby need a sealant that suits their walls. If you look after a building such as Awbridge Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Carter's Clay is about 4 miles north-west of Romsey, in Hampshire. Jobs in Carter's Clay get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Hampshire coverage runs to 683 places, Carter's Clay among them. You can also see our page for Southampton, roughly 10 miles from Carter's Clay.
Every address in SO51 is within our area for sand mastic. If you need sand mastic at a property on The Banks and Carter's Clay Road or anywhere close by, our applicators can take on the job. Close by, we work in Lockerley (1 mile north-west), Awbridge (1 mile south-east), Dunbridge (1 mile north-east), Kimbridge (2 miles north-east) and Sherfield English (2 miles south-west). Within a short drive, we also cover Winchester (11 miles east), Eastleigh (10 miles east), Andover (14 miles north), Totton (7 miles south), Chandler's Ford (8 miles east) and Hedge End (13 miles south-east).
What’s near Carter's Clay
We work in homes and buildings around Kings Arms Public House, among other places. For rail, the closest station is Mottisfont & Dunbridge station, about 1.2 miles north-east of the centre. Other landmarks nearby include Romsey Community Hospital (4 miles south-east) and King Johns House (3.4 miles south-east).
Surface by surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is generally favoured.
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.