Oxfordshire · England
Kencot Window Mastic
Specialist window mastic for Kencot: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Whistling draughts around closed windows
- Leaking joints at the ends of sills
- Untidy mastic left by window fitters
Window mastic for homes and businesses in Kencot
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that cannot move properly, so deep gaps get backing rod first. The sealant then grips the two sides it should. If you’re dealing with untidy mastic left by window fitters and cracked internal joints between frame and plaster, we can put it right, whatever the surface.
In a village or hamlet like Kencot, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
The work is covered for a year after we finish. If anything is not right with it, phone 0345 464 0079 or email us.
- Where
- Kencot (OX18)
- Wider area
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
A careful DIYer can reseal a simple joint, 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.
Landlords, agents and businesses in Kencot
We work for landlords and letting agents as well as householders. Resealing between tenancies keeps a property looking cared for.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Honest limits
To be straight with you, there are a few things sealant won’t fix:
- Draughts through the window seals rather than the frame
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Penetrating damp from a failed cavity tray or render
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Joints and surfaces we work on
- uPVC windows
- Window sills
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- Composite doors
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- The number and length of the joints
- The old material and how stubborn it is
- The number of rooms or windows
- Which sealant suits the joint
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What we need to know
To make quoting easier, please include:
- If someone has resealed it before
- The type of property
- Roughly how big the job is
- What’s wrong with the joints now
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Common questions in Kencot
Is Kencot in your area for window mastic?
Yes, Kencot is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear price.
Is there a guarantee on window mastic in Kencot?
All our work, in Kencot and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint before we leave.
Can you reach windows above the ground floor?
Yes, where it’s safe. For high or awkward windows, we’ll tell you what access is needed.
Do you have sealant for grey or black windows?
Yes, in most cases. Tell us the frame colour when you get in touch and we will use the nearest match.
Kencot homes and the weather
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Kelmscott Manor (about 4 miles south) nearby, there’s older building stock in the area around Kencot as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
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. If you look after a building such as St Peter's Church of England School, its window and door frames need their mastic kept sound, just like a home’s.
Kencot is about 2 miles south-west of Carterton, in Oxfordshire. We provide window mastic to homeowners, landlords and businesses in Kencot and nearby. We cover 443 towns and villages across Oxfordshire, from the larger towns to small villages. Oxford is on our list too, about 16 miles from Kencot.
All of OX18 is within our area for window mastic. Nearby, we also carry out window mastic in Alvescot (1 mile south-east), Shilton (2 miles north) and Bradwell (3 miles north-west). Within a short drive, 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).
Near you in Kencot
We work in homes and buildings around The Plough pub and Carterton Community College, among other places. Other landmarks nearby include Swinford Museum (1.9 miles west) and Longworth Hospital (5.9 miles south).
Other services in Kencot
Why deal with it now?
Failed mastic isn’t a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that is needed. If we find failed glass units or worn seals, we’ll tell you. Where a wall is exposed, as many are in small places like Kencot, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Doing several joints on one visit is usually more efficient than separate visits. You will get one clear quote for the whole job.
What you get with us
- Sanitary silicone with an anti-fungal additive in wet areas
- We never seal over old sealant
- ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
Read our cost guide or customer reviews.
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. Typically it takes anything from an hour or two to a full day, depending on how many frames there are, and the area is left clean. Somewhere like Kencot needs a little journey planning: 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 confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
- Keep pets and children clear of the area while we work
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or drop us an email.
Related advice
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Repaint timber before it’s bare
- Clean frames with a soft cloth and soapy water
- Look round the frames every year or so
- Air rooms to keep condensation down around windows
Wipe the frames with soapy water when you clean the windows, and avoid solvent cleaners on the sealant.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.