Oxfordshire · England
Window Mastic in Great Coxwell
Our applicators work in Great Coxwell on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- Black, perished sealant on frames
- Cracked or shrunken mastic around the frame
- Draughts coming in around windows and doors
Do you need window mastic in Great Coxwell?
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
If you can see any of these, it’s time to have the joints looked at:
- Draughty joints inside around the window
- Mastic that has split away from the wall
- Untidy mastic left by window fitters
- Mastic that is falling out in pieces
Schools such as Faringdon Community College are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- Which colour the sealant will be
- What happens if they find a problem under the old sealant
- Whether all the old sealant comes out first
- What product goes in the joint
Window mastic in Great Coxwell, done properly
Around Great Coxwell we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Common call-outs are for gaps left after new windows were fitted and damp patches on the reveal after heavy rain, across patio & French doors, composite doors and window sills.
Outdoor sealant needs dry, clean surfaces, so work on frames around Great Coxwell is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
You get a one-year guarantee, the same in Great Coxwell as everywhere else we work.
- Place
- Great Coxwell (SN7)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Also near Great Coxwell
Also in Great Coxwell
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
If you manage several properties in or around Great Coxwell, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
How we quote for window mastic
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- The type of sealant required
- The size of the job
- Mould in or behind the old joints
- Whether the work is at height
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What we need to know
When you contact us, these details help:
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- Photos by email, if that is easy
- If someone has resealed it before
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for a few frames, or a day or more for a whole house. Somewhere like Great Coxwell needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
Getting a quote
For window mastic in Great Coxwell, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
What the job involves on each surface
uPVC windows
The frame is cleaned with a product that will not harm the plastic, then the sealant goes in between frame and wall.
Composite doors
A composite door usually sits in a plastic outer frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Paint up to the joint, not over it
- Wipe condensation off the frames
- Keep paint and stain on wooden frames in good order
- Do not aim a pressure washer at the joints
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Early resealing stops it reaching that point.
Windows and doors in Great Coxwell
With historic houses such as Buscot Park (about 2.6 miles north-west) nearby, there’s older building stock in the area around Great Coxwell as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near Church of St Giles, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Great Coxwell is in Oxfordshire. For window mastic in and around Great Coxwell, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We are based in Crawley and cover Oxfordshire. 443 places in Oxfordshire are on our list, from the larger towns to small villages. For nearby work, see our Oxford page.
All of SN7 is within our area for window mastic, from the main roads to the quietest streets. Streets in the area include Dark Lane, The Hollow Road and The Holloway Road, all of which we cover. Other places close to Great Coxwell include Little Coxwell (1 mile east), Faringdon (1 mile north-east), Longcot (2 miles south) and Fernham (2 miles south-east). Larger places within reach include Abingdon-on-Thames (14 miles east), Witney (11 miles north-east), Carterton (9 miles north), Wantage (9 miles south-east), Grove (8 miles east) and Charlton (9 miles east).
Around Great Coxwell
Around Great Coxwell, our work takes us to homes and buildings near Eagle Tavern, among other places. A little further out are Faringdon Castle (2.1 miles north-east) and Faringdon Museum (1.7 miles north-east). Not far away are Badbury Hill.
FAQs for Great Coxwell
Do you cover smaller places like Great Coxwell?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do window mastic in Great Coxwell?
Yes. Our work covers London and the South East, and Great Coxwell is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Can new sealant go over the old?
No. The old sealant always comes out first, so the new sealant bonds properly.
Can you reach windows above the ground floor?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
Can you match the sealant to my frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Is the new sealant paintable?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Are you insured?
Yes. We’re fully insured.
Why act early in Great Coxwell
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Where a wall is exposed, as many are in small places like Great Coxwell, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in Great Coxwell
- Colour agreed with you before any work starts
- Quality sealants from Arbo and Everbuild
- Anti-fungal silicone where joints get wet
- We never seal over old sealant
Read our cost guide or what customers say.