West Berkshire · England
Sand mastic for sash & case windows in Clapton, West Berkshire
Our applicators work in Clapton on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Gaps round a timber door in stone or brick
- Gaps between timber frames and stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic for homes and businesses in Clapton
Traditional burnt sand mastic blends with stone and brick surrounds. It suits period and listed homes, where modern sealant can look out of place. Typical jobs include draughts and rain around sash boxes and open joints round the window box, across timber door frames, tenement windows and sash and case windows.
In a village or hamlet like Clapton, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Each job carries a 12-month guarantee.
- Where
- Clapton (RG17)
- Region
- West Berkshire
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes a few hours for a single window, longer for several. Somewhere as small as Clapton, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Mention any tricky access
- Tell us if parking is tricky
- Keep children and pets away from the work area
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Related advice
What affects the quote in Clapton
Every job gets its own quote. This is what makes a difference:
- How many areas need sealing
- Access and height
- When we can work, for business premises
- Any mould that needs treating
Combining jobs into one visit is usually more efficient than separate visits. We’ll give you a clear quote for the lot.
Asking for a quote
To make quoting easier, let us know:
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- The type of property
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
Looking after it afterwards
To keep the joints looking good and working properly:
- Do not run silicone over sand mastic
- Don’t paint over the new mastic
- Ask a joiner to look at soft timber first
- Inspect the joints round the windows every year or so
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Towns and villages near Clapton
More services for Clapton
What we’re called out for in Clapton
Sand mastic slowly weathers. It dries out, cracks and loses its grip from the frame or the masonry.
These are the problems we’re asked about most:
- Wind and rain getting in round a sash window
- Gaps where the frame meets the masonry
- Tired mastic found when preparing windows for paint
- Old cement repairs round a window that have failed
Letting a property close to Kintbury station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
What to look for in a quote
- How the colour is chosen
- How long to leave it before use
- Whether they’re fully insured
- What preparation is included
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Frames and glazing around Clapton
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Benham Park (about 3.9 miles south-east) are a reminder that the area around Clapton has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Homes close to Church of St Swithin include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Clapton is about 6 miles west of Newbury, in West Berkshire. From the centre of Clapton to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Clapton is one of 155 places in West Berkshire we cover for sand mastic. Our Reading page covers work nearby (20 miles or so).
All of RG17 is within our area for sand mastic, from the main roads to the quietest streets. If you are just outside Clapton, we cover Wickham (1 mile north-east), Upper Denford (1 mile west), Halfway (2 miles south-east), Lower Denford (2 miles south-west) and Shefford Woodlands (2 miles north-west). Larger places within reach include Newbury (6 miles east), Thatcham (9 miles east), Speenhamland (6 miles east), Hungerford (3 miles west), Lambourn (6 miles north-west) and Shaw (6 miles east).
Landmarks near Clapton
The nearest railway station is Kintbury station, about 1.8 miles south. Other landmarks nearby include Hamstead Marshall 3 (3.1 miles south-east). The countryside around Clapton includes Sole Common Pond.
How the job changes by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Sash and case windows
The mastic round a sash window is on show so we finish it carefully.
What we can’t put right
We will always be straight with you, so here’s what sealant can’t fix:
- Sashes that rattle, stick or won’t open
- Broken panes
- Decayed frames that need repair
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Clapton
- Period & listed homes
- Brick reveals
- Sash and case windows
- Timber door frames
- Tenement windows
- Stone surrounds
Common questions in Clapton
Do you cover smaller places like Clapton?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you work for landlords with property near Kintbury station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Can you replace silicone on a period window with sand mastic?
Usually, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Are you fully insured?
Yes, we’re fully insured for every job we do.