Oxfordshire · England
Window Mastic in Upper Arncott
Problem with your window and door frames in Upper Arncott? We cut out the old, prepare the joints and apply the right sealant.
- Black, perished sealant on frames
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
Window mastic in Upper Arncott
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through. If the draught is through the window seals instead, we will tell you. We work on patio & French doors, window sills and aluminium frames, and common reasons people get in touch are untidy mastic left by window fitters and sealant in the wrong colour for the frame.
Outdoor sealant needs dry, clean surfaces, so work on frames around Upper Arncott is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Big or small, you get the same one-year guarantee in Upper Arncott and across Oxfordshire.
- Where
- Upper Arncott (OX25)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Window mastic in Upper Arncott: local notes
Historic houses like Boarstall Tower (about 2 miles south-east) are a reminder that the area around Upper Arncott has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Bicester Village station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Boarstall Tower, about 2 miles south-east, is one of the historic houses in the wider area around Upper Arncott, and older homes nearby need a sealant that suits their walls.
Upper Arncott is about 4 miles south-east of Bicester, in Oxfordshire. Upper Arncott gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Upper Arncott is one of 443 towns and villages in Oxfordshire where we work. We also work in Oxford, about 8 miles from Upper Arncott.
All of OX25 is within our area for window mastic. We cover properties on Hopcraft Close, Murcott Road and Teale Close and the roads around them. Other places close to Upper Arncott include Lower Arncott (1 mile north), Ambrosden (1 mile north), Murcott (2 miles south-west), Merton (2 miles west) and Fencott (2 miles west). We also work in nearby towns such as Oxford (8 miles south-west), Bicester (4 miles north-west), Abingdon-on-Thames (14 miles south-west), Thame (9 miles south-east), Kidlington (8 miles west) and Chinnor (14 miles south-east).
Near you in Upper Arncott
Around Upper Arncott, our work takes us to homes and buildings near The Plough pub. Upper Arncott’s nearest station is Bicester Village station, about 3.3 miles north-west. A little further out are Bicester Community Hospital (3.7 miles north-west) and Bicester Village (3.4 miles north-west). Green spaces nearby include Otmoor RSPB reserve and Graven Hill.
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Rotten timber, which needs a joiner first
- Damp coming through the wall itself rather than the frame joint
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Composite doors
- Patio & French doors
- Aluminium frames
- uPVC windows
- Window sills
- Timber windows & doors
Landlord and commercial work in Upper Arncott
For anyone letting property in or around Upper Arncott, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Places near Upper Arncott
What else we do in Upper Arncott
How it works
The work is kept neat and contained to the joints we’re treating. Expect the work to take a few hours for a few frames, or a day or more for a whole house, and we tell you how long to leave it before we go. Somewhere as small as Upper Arncott, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
- Let us know about earlier repairs to the joints
Get a quote
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
Related advice
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Your questions about window mastic in Upper Arncott
Can you do window mastic in Upper Arncott?
Yes. Our work covers London and the South East, and Upper Arncott is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Will you come out to Upper Arncott?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Are you insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Does the work come with a guarantee?
Yes. All our work carries a 12-month guarantee, and we are ARBOMaster approved applicators.
Looking after it afterwards
Looking after new joints is easy:
- Keep timber frames painted
- Do not use solvent cleaners on the joint
- Ventilate rooms so frames do not stay wet inside
- Paint up to the joint, not over it
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
What happens if it’s left?
Running fresh sealant over the old joint is tempting, but new sealant cannot bond to old, crumbling mastic. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. Around Upper Arncott, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Why choose Mr Mastic in Upper Arncott
- We leave the area clean and tidy
- We never seal over old sealant
- Colour agreed with you before work begins
- Domestic, commercial and hotel work
Surface by surface
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so they get particular care.
Aluminium frames
Coated aluminium needs a compatible sealant, and acetoxy silicones aren’t used, as they can attack some metals. Neutral-cure sealant is the safe choice.