Oxfordshire · England
Charlton-on-Otmoor Window Mastic
Problem with your window and door frames in Charlton-on-Otmoor? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Sealant in the wrong colour for the frame
- Draughts coming in around windows and doors
- Rushed sealant from a window installation
How we handle window mastic in Charlton-on-Otmoor
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. Common call-outs are for whistling draughts around closed windows and hard, cracked sealant around windows, across patio & French doors, composite doors and timber windows & doors.
Around Charlton-on-Otmoor, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
You’re covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or drop us an email.
- Place
- Charlton-on-Otmoor (OX5)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need window mastic in Charlton-on-Otmoor
Sun, frost and rain wear sealant out. Sunlight dries the surface out, until it loses its stretch and starts to crack.
Any of these means the joints need attention:
- Cracked internal joints between frame and plaster
- Whistling draughts around closed windows
- Black, perished sealant on frames
- Gaps where the sill meets the wall
Letting a property close to Islip station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- Who does the work, and how experienced they are
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
- What the cure time is
What we cannot put right
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A sash or casement that won’t close properly
- A frame that has rotted at the joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Where we work in Charlton-on-Otmoor
- Composite doors
- Window sills
- uPVC windows
- Aluminium frames
- Timber windows & doors
- Patio & French doors
Towns and villages near Charlton-on-Otmoor
Other services in Charlton-on-Otmoor
DIY versus a professional finish
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Frames and glazing around Charlton-on-Otmoor
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. With historic houses such as Boarstall Tower (about 4 miles east) nearby, there’s older building stock in the area around Charlton-on-Otmoor 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 is traditional sand mastic.
If you live in an older home near Church of St Mary the Virgin, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Charlton-on-Otmoor Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Charlton-on-Otmoor is about 5 miles south of Bicester, in Oxfordshire. For window mastic in and around Charlton-on-Otmoor, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We cover Oxfordshire from our Crawley base. We cover 443 towns and villages across Oxfordshire, from the larger towns to small villages. Oxford is on our list too, around 6 miles away.
Postcode districts we cover here for window mastic: OX5. You’ll find streets such as High Street, Blacksmiths Lane and Church Lane, and we cover them all. We also cover Fencott (1 mile east), Murcott (1 mile east), Merton (1 mile north-east), Wendlebury (2 miles north) and Horton-cum-Studley (3 miles south-east). We also work in nearby towns such as Oxford (6 miles south), Bicester (5 miles north), Abingdon-on-Thames (12 miles south), Witney (13 miles west), Thame (11 miles south-east) and Kidlington (4 miles west).
Around Charlton-on-Otmoor
We work in homes and buildings around The Crown pub and the streets around them. The closest station to Charlton-on-Otmoor is Islip station, about 2.3 miles west. Other landmarks nearby include Bicester Community Hospital (4.2 miles north) and Bicester Avenue (3.6 miles north). Green spaces nearby include Graven Hill and Otmoor RSPB reserve.
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Keep jet washers away from the mastic
- Walk round the house once a year and look at the joints
- Air rooms to keep condensation down around windows
- Make sure the drainage slots are not blocked
A yearly look round the frames is enough. Small splits are simple to catch before they leak.
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. If you notice one, it’s time to get the joint looked at.
What the job involves on each surface
Composite doors
Draughts round the door leaf normally come from worn seals or adjustment, not the mastic. We will tell you if that is what we find.
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that.
How we quote for window mastic
The quote reflects the job in front of us. We look at:
- Mould in or behind the old joints
- The amount of work
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- A few pictures by email, if you can
- What’s wrong with the joints now
- Any access issues, like height or stairs
- Roughly how big the job is
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
How it works
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take a morning for a couple of windows and a door. For a village or hamlet like Charlton-on-Otmoor, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
How to prepare
- Let us know about stairs, lifts or work at height
- Where the joints are inside, avoid wetting them before we arrive
- Keep pets and children clear of the area while we work
Ask for a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand.
Advice
Questions from Charlton-on-Otmoor
I let a flat near Islip station. Can you help?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Is Charlton-on-Otmoor in your area for window mastic?
Yes. Our work covers London and the South East, and Charlton-on-Otmoor is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
How long does it take to reseal the windows on a house?
The work takes most of a day for a typical house, less for a few frames. Access and how stubborn the old mastic is affect the time most.
What information do you need?
A short description and the location, with photos by email if possible. We will ask anything else we need to know.
Can you do upstairs windows?
Yes, if safe access is possible. Higher or awkward frames may need extra access, and we will confirm what’s needed.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What does window mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.