Oxfordshire · England
Sand Mastic in Fencott
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Fencott and across Oxfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Crumbling sand mastic round a window
- Cracked mastic round a front door frame
- Gaps between timber frames and stone or brick
How we quote for sand mastic
Every job gets its own quote. This is what makes a difference:
- When we can work, for business premises
- The size of the job
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
What you pay reflects the work, not guesswork. That’s why we ask about the job first and give you a clear price before any work starts.
Helping us quote
When you call or email, it’s useful to know:
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- Pictures of the joints, sent by email
- What’s wrong with the joints now
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
About our sand mastic in Fencott
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. We are often asked to deal with silicone on a period window that looks wrong and cement or filler used on old window joints that has cracked, on brick reveals, sash and case windows and stone surrounds.
Around Fencott, 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.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Location
- Fencott (OX5)
- Wider area
- Oxfordshire
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What else we do in Fencott
What we do, step by step
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a single window, longer for several. Somewhere as small as Fencott, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Related advice
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Don’t run silicone over sand mastic
- Renew mastic before redecorating the windows
- Avoid heavy scraping on the mastic joint
- Ask us before painting near the mastic
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.
DIY sealant or a professional job?
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 doesn’t move well, and the joint depth matters as much as the finish.
Do you need sand mastic in Fencott?
Over the years, sand mastic weathers. It hardens, cracks and starts to come away on the stone or timber.
It’s worth asking for a quote if you see:
- Failed mastic on an exposed elevation
- Modern sealant on a period surround
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
Boarstall Tower, about 3.2 miles south-east, is one of the historic houses in the wider area around Fencott.
What your quote should include
- Which colour the sealant will be
- Who turns up on the day
- Whether all the old sealant comes out first
- What happens if the job turns out different
Questions from Fencott
Will you come out to Fencott?
Yes. Fencott 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.
Can you do sand mastic in Fencott?
Yes, Fencott is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
How long does sand mastic take to go off?
It forms a skin fairly soon and it hardens fully over a longer time. Timing depends on the weather and the joint.
How do I get a quote for sand mastic in Fencott?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where is Mr Mastic based?
We’re based in Crawley, and we cover South East England, London and all of Scotland.
Is the work guaranteed?
There’s a 12-month guarantee on every job, sand mastic included.
Frames and glazing around Fencott
With historic houses such as Boarstall Tower (about 3.2 miles south-east) nearby, there’s older building stock in the area around Fencott 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. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
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. Letting a property close to Islip station? Then any sash windows need sound mastic to keep draughts and rain out.
Fencott is about 4 miles south of Bicester, in Oxfordshire. For sand mastic in and around Fencott, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Oxfordshire from our Crawley base, Fencott included. Fencott is one of 443 towns and villages in Oxfordshire where we work. We also work in Oxford, around 7 miles away.
We cover every part of the OX5 postcode area for sand mastic and the streets around it. If you’re just outside Fencott, we cover Murcott (1 mile south-east), Charlton-on-Otmoor (1 mile west), Merton (1 mile north), Upper Arncott (2 miles east) and Wendlebury (2 miles north-west). Larger places within reach include Oxford (7 miles south-west), Bicester (4 miles north), Abingdon-on-Thames (12 miles south-west), Witney (14 miles west), Thame (11 miles south-east) and Kidlington (5 miles west).
Landmarks near Fencott
Around Fencott, our work takes us to homes and buildings near The Crown pub. Fencott’s nearest station is Islip station, roughly 3.2 miles west. Well-known places in the area include Bicester Avenue (3.2 miles north) and Bicester Community Hospital (3.8 miles north). Not far away are Otmoor RSPB reserve and Graven Hill.
How the job changes by surface
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Landlord and commercial work in Fencott
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
If you manage several properties in or around Fencott, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.