Oxfordshire · England
Charlton-on-Otmoor Sand Mastic
Specialist sand mastic for Charlton-on-Otmoor: careful preparation, the right product and tidy work. Call for a quick quote.
- Patchy fillers round a sash window
- Mastic round period door frames that has failed
- Mastic that needs renewing before redecorating
How we handle sand mastic in Charlton-on-Otmoor
We work across Charlton-on-Otmoor renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. We work on tenement windows, sash and case windows and stone surrounds, and people most often call us about mastic that needs renewing before redecorating and weathered mastic on the most exposed windows.
Around Charlton-on-Otmoor, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Charlton-on-Otmoor (OX5)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
So the new joints stay in good condition:
- Take care around the mastic when scraping paint
- Keep modern sealant off the mastic
- Get any rot dealt with first
- Ask us before painting near the mastic
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
Questions from Charlton-on-Otmoor
Do you work for landlords with property near Islip station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or email us with the details for a clear quote.
Is Charlton-on-Otmoor within the area you cover?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How long does sand mastic take?
It depends on the size of the job, but most jobs take a few hours per window, depending on the condition of the joints. We’ll tell you when we quote.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or drop us an email.
Will there be a smell?
Some sealants have a smell while they cure. Opening a window helps.
Is it possible to take out silicone and use sand mastic instead?
Yes, we do this often. All the old silicone is removed first so the mastic beds in well.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
What we do, step by step
You don’t need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes anything from a few hours to a full day, depending on how many windows for a typical job. 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.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Clear the area around the work
- Tell us about any water getting in
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Advice
Also near Charlton-on-Otmoor
What else we do in Charlton-on-Otmoor
Leave it or put it right?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in and new mastic seals them. Where a wall is exposed, as many are in small places like Charlton-on-Otmoor, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why Charlton-on-Otmoor customers choose us
- ARBOMaster approved applicator
- Full insurance on every job
- Quality sealants from Arbo and Everbuild
- Every job guaranteed for a year
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How we quote for sand mastic
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- How much there is to do
- Working hours on commercial sites
- The type of sealant required
- How many areas need sealing
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
Before you ask for a quote, have a think about:
- The problem you’ve noticed
- Any previous sealing or DIY work
- Where the job is, and your postcode
- A few photos by email, if you can
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work and send you a clear quote.
What we are called out for in Charlton-on-Otmoor
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint and we normally remove them.
It’s worth asking for a quote if you see:
- Tired mastic found when preparing windows for paint
- A silicone bead on a sash window that spoils the look
- Mastic round period door frames that has failed
- Wind and rain getting in round a sash window
Letting a property close to Islip station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Before booking anyone
- Whether all the old sealant comes out first
- Which sealant they’ll use, and why
- Are they insured?
- How the colour is chosen
What sealant work can’t fix
New sealant can’t fix everything, and we will tell you before we start. It will not solve:
- Decisions on consent for listed homes
- Decayed frames that need repair
- Cracked or broken glass
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Where we work in Charlton-on-Otmoor
- Timber door frames
- Stone surrounds
- Brick reveals
- Sash and case windows
- Period & listed homes
- Tenement windows
Sand mastic in Charlton-on-Otmoor: local notes
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. Historic houses like Boarstall Tower (about 4 miles east) are a reminder that the area around Charlton-on-Otmoor has older buildings as well as new. 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.
If you live in an older home near Church of St Mary the Virgin, 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 Charlton-on-Otmoor Church of England Primary School, 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. We carry out sand mastic for homes and businesses in Charlton-on-Otmoor, as part of our work across Oxfordshire. Across Oxfordshire, we cover 443 places, Charlton-on-Otmoor among them. For nearby work, see our Oxford page.
We work across the OX5 postcode area for sand mastic. Local streets include High Street, Blacksmiths Lane and Church Lane. Nearby, we also carry out sand mastic in 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). Further out, we also cover 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
Locally, jobs take us to homes and businesses close to The Crown pub and the streets around them. Charlton-on-Otmoor’s nearest station is Islip station, roughly 2.3 miles west of the centre. Other landmarks nearby include Bicester Community Hospital (4.2 miles north) and Bicester Avenue (3.6 miles north). Open spaces near Charlton-on-Otmoor include Graven Hill and Otmoor RSPB reserve.