Oxfordshire · England
Westcot Sand Mastic
Sand mastic for Westcot, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Gaps where the frame meets the masonry
Windows and doors in Westcot
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.
Homes close to Church of the Holy Rood include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Westcot is about 4 miles west of Wantage, in Oxfordshire. Westcot gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Oxfordshire coverage runs to 443 places, Westcot among them. We also work in Oxford, around 16 miles away.
We cover every part of OX12 for sand mastic and the streets around it. If you are just outside Westcot, we cover Sparsholt (1 mile east), Kingston Lisle (1 mile west), Woolstone (3 miles west), Upper Lambourn (5 miles south) and Sheepdrove (5 miles south). Larger places within reach include Didcot (11 miles east), Abingdon-on-Thames (12 miles north-east), Witney (14 miles north), Carterton (13 miles north), Wantage (4 miles east) and Grove (4 miles east).
Local landmarks in Westcot
Nearby you will also find Faringdon Day Hospital (5.8 miles north-west) and Uffington Museum (2.5 miles west). Green spaces nearby include Rams Hill and Letcombe Valley.
How we handle sand mastic in Westcot
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. We work on period & listed homes, sash and case windows and stone surrounds, and people most often call us about gaps where the frame meets the masonry and silicone on a period window that looks wrong.
Mastic can only go onto a dry, clean joint, so window work in Westcot is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Westcot (OX12)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Westcot
Other services in Westcot
FAQs for Westcot
Is Westcot in your area for sand mastic?
Yes. Our work covers London and the South East, and Westcot is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Is sand mastic in Westcot guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Are you fully insured?
Yes. Full insurance covers our work.
How do I get a quote for sand mastic in Westcot?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
How long does sand mastic take?
Typically it takes a few hours for a single window, longer for several. Bigger jobs take longer, and we’ll tell you how long to expect.
Is it OK to seal over old sealant?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant.
Landlord and commercial work in Westcot
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
Surface by surface
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. The method is the same as for windows.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
How the visit works
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a few hours per window, depending on the condition of the joints. For a village or hamlet like Westcot, the journey is planned in advance: 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 look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll explain what’s involved.
Read more
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- Timber that has rotted
- Broken panes
- Decisions on consent for listed homes
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Where we work in Westcot
- Period & listed homes
- Brick reveals
- Stone surrounds
- Timber door frames
- Sash and case windows
- Tenement windows
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
What we’re called out for in Westcot
Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber, and they normally need raking out.
Most people get in touch after spotting one of these:
- Tired mastic found when preparing windows for paint
- Silicone on a period window that looks wrong
- Wind and rain getting in round a sash window
- Gaps where the frame meets the masonry
Schools such as The Ridgeway Church of England (C) Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- How the surfaces are prepared before sealing
- What happens if the job turns out different
- Whether they seal over old material or remove it
- Is VAT in the price?
Quotes for sand mastic in Westcot
Every job gets its own quote. These are the things that affect it:
- Whether the work is at height
- The number of rooms or windows
- Any working-time requirements on site
- The amount of work
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll go through it with you.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- The problem you’ve noticed
- The address or postcode of the job
- Roughly how big the job is
- Any access issues, like height or stairs
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.