Oxfordshire · England
Sand mastic for sash & case windows in Poundon, Oxfordshire
Window and door surrounds in Poundon need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Wind and rain getting in round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic round period door frames that has failed
How we handle sand mastic in Poundon
A silicone bead around a sash window can look out of place and isn’t always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. Common call-outs are for gaps round a timber door in stone or brick and draughts and rain around sash boxes, on brick reveals, timber door frames and sash and case windows.
Mastic can only go onto a dry, clean joint, so window work in Poundon is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Poundon (OX27)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
The work is kept neat and contained to the joints we are treating, so you can carry on as normal. Expect the work to take a few hours for a single window, longer for several, and we explain the cure time before we leave. Somewhere like Poundon needs a little journey planning: 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 agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, phone 0345 464 0079 or email us.
Advice
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Why it’s worth doing now in Poundon
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. Older cottages and farmhouses around Poundon can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
Why choose Mr Mastic in Poundon
- An ARBOMaster approved applicator
- 20+ years of sealant experience
- Trusted Arbo and Everbuild sealants
- Full insurance on every job
Read what affects the cost or our reviews.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Renew mastic before redecorating the windows
- Inspect the joints round the windows every year or so
- Take care around the mastic when scraping paint
- Leave the new mastic unpainted
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
Also near Poundon
Other services in Poundon
FAQs for Poundon
Can you help a landlord with a rental near Bicester North station?
Yes. We work for landlords and agents as well as householders. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Do you cover Poundon for sand mastic?
Yes, Poundon is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s applied by hand and finished to sit neatly against the masonry.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
What guarantee comes with the work?
There’s a 12-month guarantee on every job, sand mastic included.
How do I get a quote for sand mastic in Poundon?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
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.
Do you have insurance?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
When something else is needed
A few problems are outside what sealant work can do:
- Crumbling stone or brickwork round the window
- Timber that has rotted
- Sashes that need overhauling
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Stone surrounds
- Sash and case windows
- Brick reveals
- Tenement windows
- Period & listed homes
- Timber door frames
Common problems we fix in Poundon
Water gets into small cracks in the mastic and pushes it out. Exposed elevations normally fail first.
People usually contact us after spotting one of these:
- Modern sealant on a period surround
- Open joints round the window box
- Cracked mastic round a front door frame
- Cement or filler used on old window joints that has cracked
Historic houses such as Claydon House, about 4.5 miles east, show how far back building around Poundon goes.
What to look for in a quote
- Is the old sealant removed completely?
- What the quote includes, VAT included or not
- How long to leave it before use
- The length of the guarantee
Sand mastic in Poundon: local notes
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Claydon House (about 4.5 miles east) nearby, there’s older building stock in the area around Poundon 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.
If you let a flat or house near Bicester North station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Poundon is about 4 miles east of Bicester, in Oxfordshire. From the centre of Poundon to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. 443 places in Oxfordshire are on our list. You can also see our page for Oxford, about 14 miles away.
Postcode districts we cover here for sand mastic: OX27. Close by, we work in Twyford (1 mile north-east), Marsh Gibbon (2 miles south), Charndon (2 miles south-east), Calvert (3 miles east) and Preston Bissett (3 miles north). Further out, we also cover Oxford (14 miles south-west), Bicester (4 miles west), Thame (13 miles south), Kidlington (12 miles south-west), Headington Quarry (13 miles south-west) and Bure Park (4 miles west).
Near you in Poundon
We work in homes and buildings around The Sow and Pigs pub, among other places. The nearest railway station is Bicester North station, roughly 4.1 miles west of the centre. Well-known places in the area include Bicester Community Hospital (4.6 miles south-west). The countryside around Poundon includes Graven Hill and Calvert Jubilee.
Landlords, agents and businesses in Poundon
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
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.