Oxfordshire · England
Sand Mastic in Kencot
Window and door surrounds in Kencot need attention? We cut out the old, prepare the joints and apply the right sealant.
- Gaps round a timber door in stone or brick
- Gaps between timber frames and stone or brick
- Modern sealant on a period surround
When something else is needed
Before booking, it’s worth knowing the limits:
- Crumbling stone or brickwork round the window
- Timber that has rotted
- Sash cords, weights and draught-proofing of the sashes
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Surfaces we seal
- Period & listed homes
- Brick reveals
- Timber door frames
- Sash and case windows
- Stone surrounds
- Tenement windows
How we handle sand mastic in Kencot
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on sash and case windows, tenement windows and brick reveals, and people most often call us about a silicone bead on a sash window that spoils the look and crumbling sand mastic round a window.
Outdoor sealant needs dry, clean surfaces, so work on frames around Kencot is planned for dry weather. 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.
- Place
- Kencot (OX18)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic doesn’t seal it, and the new mastic is traditionally left unpainted. Around Kencot, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- Full insurance on every job
- Anti-fungal sanitary silicone in wet areas
- Every job guaranteed for a year
- Rated 4.9 stars on Google
Read how sealant jobs are priced or our reviews.
Common problems we fix in Kencot
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
People generally contact us after spotting something like this:
- Mastic that needs renewing before redecorating
- Gaps where the frame meets the masonry
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
If you look after a building such as St Peter's Church of England School, larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- How the joint is cleaned and prepared
- How much experience the applicator has
- Whether VAT is included
- What happens if the job turns out different
Also in Kencot
Questions from Kencot
Is Kencot within the area you cover?
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.
Is sand mastic in Kencot guaranteed?
All our work, in Kencot and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
Can you do several jobs on one visit?
Yes. More than one area can be quoted together.
Is sand mastic better than silicone for my windows?
It depends on the window. Period windows in stone or brick usually suit sand mastic, while modern frames normally get a flexible sealant.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
What sealant 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. We use products from Arbo and Everbuild.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours for a single window, longer for several. We will tell you when we quote.
Should I try it myself first?
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. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
What the job involves on each surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Kencot homes and the weather
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Kelmscott Manor (about 4 miles south) are a reminder that the area around Kencot 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’s traditional sand mastic.
Homes close to Church of St Peter include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Kencot is about 2 miles south-west of Carterton, in Oxfordshire. If you need sand mastic in Kencot, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We’re based in Crawley and cover Oxfordshire, Kencot included. Our Oxfordshire coverage runs to 443 places, Kencot among them. Oxford is on our list too, around 16 miles away.
Work in OX18 works the same way as everywhere else we cover. Neighbouring places we cover for sand mastic include Alvescot (1 mile south-east), Shilton (2 miles north) and Bradwell (3 miles north-west). Further out, we also cover Abingdon-on-Thames (15 miles east), Witney (6 miles north-east), Wantage (13 miles south-east), Grove (12 miles south-east), Faringdon (6 miles south) and Kidlington (15 miles east).
What’s near Kencot
In Kencot, that means homes and buildings near The Plough pub and Carterton Community College and the streets around them. A little further out are Swinford Museum (1.9 miles west) and Longworth Hospital (5.9 miles south).
Looking after it afterwards
So the new joints stay in good condition:
- Check with your local planning authority if your home is listed
- Clear gutters so water does not pour onto the windows
- Check the mastic when you check the paintwork
- Keep modern sealant off the mastic
Do not run silicone over the new mastic. If you see a crack, ask us to take a look before trying a quick fix.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
How it works
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes anything from a few hours to a full day, depending on how many windows. In a small place like Kencot, access is normally the main thing to plan. 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.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Clear items away from the joints we’re working on
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about parking restrictions
How to get a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand.