Oxfordshire · England
Sand mastic for sash & case windows in Delly End, Oxfordshire
Sand mastic in Delly End from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic worn away on windows facing the weather
- Mastic round period door frames that has failed
- Old cement repairs round a window that have failed
Different surfaces, different methods
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Stone surrounds
The stone is treated with care when the old mastic comes out.
Sand mastic in Delly End
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. We work on brick reveals, stone surrounds and sash and case windows, and people most often call us about gaps where the frame meets the masonry and patchy fillers round a sash window.
Mastic can only go onto a dry, clean joint, so window work in Delly End is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
You’re covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Where
- Delly End (OX29)
- Wider area
- Oxfordshire
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Landlord and commercial work in Delly End
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Landlords and agents in Delly End can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Take care around the mastic when scraping paint
- Renew mastic before redecorating the windows
- Check with your local planning authority if your home is listed
- Look over the window mastic once a year
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Your questions about sand mastic in Delly End
Is Delly End in your area for sand mastic?
Yes. We work across London and the South East, and Delly End is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Is Delly End within the area you cover?
Yes. Delly End is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Is it OK to seal over old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can landlords and businesses book you?
Yes. As well as householders, we work for landlords, agents, businesses and hotels across Oxfordshire.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
How much does sand mastic cost in Delly End?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They’ll tell you if consent is needed.
Also near Delly End
More services for Delly End
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Signs you need sand mastic in Delly End
Timber swells and shrinks with the weather. The movement cracks the mastic over time.
These are the problems we are asked about most:
- Crumbling sand mastic round a window
- Modern sealant on a period surround
- Draughts and rain around sash boxes
- Gaps between timber frames and stone or brick
Schools such as Hailey Church of England Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
- Whether VAT is included
- What guarantee comes with the work
The process
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours for a single window, longer for several. For a village or hamlet like Delly End, 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 look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Mention any sign-in or site rules at work premises
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
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 photos by email if you can.
Advice
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Timber that has rotted
- Broken panes
- Damaged stone surrounds
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Surfaces we seal
- Brick reveals
- Tenement windows
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Timber door frames
Sand mastic in Delly End: local notes
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. With historic houses such as Minster Lovell Hall (about 2.2 miles south-west) nearby, there’s older building stock in the area around Delly End 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 live in an older home near Church of St John the Evangelist, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Finstock station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Delly End is about 2 miles north of Witney, in Oxfordshire. If you need sand mastic in Delly End, please ring 0345 464 0079 or email us for a quick quote. We cover Oxfordshire from our Crawley base. Our Oxfordshire coverage runs to 443 places, Delly End among them. You can also see our page for Oxford, roughly 12 miles from Delly End.
Every address in OX29 is within our area for sand mastic, from the main roads to the quietest streets. That includes homes and businesses on Delly Close, Whitings Lane and Wood Lane and the roads around them. Nearby, we also carry out sand mastic in Hailey (1 mile south-west), Poffley End (1 mile south-east), Ramsden (1 mile north), New Yatt (1 mile east) and Finstock (2 miles north). Further out, we also cover Oxford (12 miles south-east), Bicester (15 miles east), Abingdon-on-Thames (13 miles south-east), Carterton (6 miles south-west), Grove (15 miles south) and Faringdon (12 miles south).
Local landmarks in Delly End
Locally, jobs take us to homes and businesses close to The King's School, The Lamb And Flag Public House and Wood Green School, among other places. The nearest railway station is Finstock station, about 2.6 miles north. Well-known places in the area include Cogges Manor Farm Museum (2.3 miles south). Green spaces nearby include Blenheim Farm.