Oxfordshire · England
Stonor Window Mastic
Window mastic across Stonor and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Draughts coming in around windows and doors
- Black, perished sealant on frames
- Hard, cracked sealant around windows
Window mastic in Stonor
Around Stonor we seal all kinds of frames: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on uPVC windows, composite doors and aluminium frames, and the jobs we see most are old mastic that has gone black or come away and gaps left after new windows were fitted.
Somewhere as small as Stonor, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
Your job is guaranteed for a year, as with all our work.
- Place
- Stonor (RG9)
- Wider area
- Oxfordshire
- Guarantee
- A year, on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for a handful of frames, longer for a whole house. For a village or hamlet like Stonor, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Getting ready for the visit
- Mention any parking rules near the property
- Keep children and pets away from the work area
- Move anything stored near the joints
Get a quote
Every job is quoted individually. Simply call 0345 464 0079 or email us and describe the job, and pictures are welcome.
Related advice
Window mastic in Stonor: local notes
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 Stonor Park (about 0.5 miles south-east) are a reminder that the area around Stonor 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.
In the older streets around Pishill Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Stonor is about 5 miles north of Henley-on-Thames, in Oxfordshire. Anywhere in RG9, we can carry out window mastic at your property. Our area takes in 443 places across Oxfordshire, large and small. Reading is on our list too, about 11 miles from Stonor.
Our applicators cover all of the RG9 postcode area for window mastic. Other places close to Stonor include Turville Heath (1 mile north-east), Northend (2 miles north), Christmas Common (2 miles north-west), Cookley Green (3 miles west) and Howe Hill (3 miles north-west). Larger places within reach include Didcot (13 miles west), Thame (10 miles north), Henley-on-Thames (5 miles south), Benson (7 miles west), Chinnor (7 miles north) and Tilehurst (11 miles south-west).
Near you in Stonor
We work in homes and buildings around The Crown Inn Public House. The countryside around Stonor includes Warburg Nature Reserve and Bald Hill.
What the job involves on each surface
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. We’ll point out any rot we find, as that’s a job for a joiner.
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
Common questions in Stonor
What guarantee comes with window mastic in Stonor?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Will you come out to Stonor?
Yes. Stonor is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We will tell you what we’re using and why.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can you get sealant to suit coloured frames?
Yes, in most cases. Mention the frame colour when you ask for a quote and we’ll use the nearest match.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that usually means someone at home.
Signs you need window mastic in Stonor
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, and it lets go sooner than it should.
These are the problems we’re asked about most:
- Cracked sealant at the sill ends
- Cold air getting in at the frame edge
- Draughty joints inside around the window
- Black, perished sealant on frames
In and around Stonor, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Before you book anyone
- Whether all the old sealant comes out first
- Who does the work, and how experienced they are
- The length of the guarantee
- What preparation is included
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Do not paint over the silicone
- Wash the frames with mild soapy water
- Air rooms to keep condensation down around windows
- Don’t use solvent cleaners on the joint
Most silicone sealants will not take paint, so mention any painting plans before work begins. There are paintable sealants for joints that need it.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. Resealing closes it.
What sealant work can’t fix
We will not take on work that won’t last, so here’s what sealant cannot put right:
- Condensation trapped between the panes
- Draughts through the window seals rather than the frame
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Stonor
- Window sills
- Patio & French doors
- Aluminium frames
- Composite doors
- uPVC windows
- Timber windows & doors
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Places near Stonor
Other services in Stonor
Leave it or put it right?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. Around Stonor, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why us?
- 20+ years of sealant experience
- ARBOMaster approved applicator
- Colour picked to suit the job
- 180+ five-star Google reviews
Read our cost guide or our reviews.