Oxfordshire · England
Sand mastic for sash & case windows in Shirburn, Oxfordshire
Professional sand mastic in and around Shirburn, with every bit of old sealant taken out first and a 12-month guarantee.
- Patchy fillers round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
How we handle sand mastic in Shirburn
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. We work on sash and case windows, brick reveals and tenement windows, and the jobs we see most are gaps where the frame meets the masonry and failed mastic on an exposed elevation.
Somewhere as small as Shirburn, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job.
- Place
- Shirburn (OX49)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Leave it or put it right?
Filling over old, loose mastic does not last. Raking out and preparing the joint gives it a sound base so the new mastic stays put. In a small place like Shirburn, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
What you pay reflects the work, not guesswork. That’s why we ask about the job first and agree the price before starting.
Why us?
- Arbo and Everbuild products
- Anti-fungal silicone where joints get wet
- Rated 4.9 stars on Google
- Homes, businesses and hotels
Take a look at what affects the cost or customer reviews.
Sand mastic in Shirburn: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Adwell House (about 2.4 miles north) are a reminder that the area around Shirburn 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.
In the older streets around All Saints Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Shirburn is about 6 miles south of Thame, in Oxfordshire. Anywhere in OX49, we cover sand mastic for homes and businesses. Our Oxfordshire coverage runs to 443 places, Shirburn among them. Our Oxford page covers work nearby, about 12 miles away.
Jobs for sand mastic in OX49 works the same way as everywhere else we cover. Streets in the area include Watlington Road, Castle Road and Blenheim Road, and we cover them all. Other places close to Shirburn include Lewknor (1 mile north-east), South Weston (2 miles north), Christmas Common (2 miles south-east), Postcombe (2 miles north) and Howe Hill (3 miles south). We also work in nearby towns such as Oxford (12 miles north-west), Didcot (11 miles west), Abingdon-on-Thames (13 miles west), Thame (6 miles north), Henley-on-Thames (9 miles south-east) and Benson (5 miles south-west).
Local landmarks in Shirburn
Typical jobs here are in homes near Watlington Primary School, St Mary's Church and The Chequers pub and the streets around them. Not far away are Aston Rowant NNR and Bald Hill.
What the job involves on each surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
What we do, step by step
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the job takes a few hours for a single window, longer for several in most cases. Somewhere like Shirburn 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.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
How to get a quote
If you’re in Shirburn and need sand mastic, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Advice
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Go gently near the mastic when preparing windows
- Find out about consent before window work on a listed home
- Don’t run silicone over sand mastic
- Look over the window mastic once a year
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Honest limits
Sealant is not the answer to every problem, and we will tell you before work begins. Sealant won’t put right:
- Cracked or broken glass
- Planning or listed building consent (your local planning authority decides)
- Sashes that rattle, stick or won’t open
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
Where we work in Shirburn
- Stone surrounds
- Sash and case windows
- Tenement windows
- Period & listed homes
- Brick reveals
- Timber door frames
DIY sealant or a professional job?
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, then guaranteed for a year.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Places near Shirburn
What else we do in Shirburn
When to call us in Shirburn
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
The most common problems we see are:
- Gaps round a timber door in stone or brick
- Mastic dropping out of the joint
- Gaps between timber frames and stone or brick
- Tired mastic found when preparing windows for paint
Schools such as Icknield Community College are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- Whether the sealant suits the joint
- What guarantee comes with the work
- What happens if they find a problem under the old sealant
- What insurance they hold
Common questions in Shirburn
Do you cover smaller places like Shirburn?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Shirburn for sand mastic?
Yes. Our work covers London and the South East, and Shirburn is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Where is Mr Mastic based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.