Oxfordshire · England
Sand mastic for sash & case windows in New Yatt, Oxfordshire
We cover New Yatt for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Patchy fillers round a sash window
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Sand mastic in New Yatt, done properly
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. We are often asked to deal with gaps round a timber door in stone or brick and tired mastic found when preparing windows for paint, on brick reveals, stone surrounds and tenement windows.
Outdoor sealant needs dry, clean surfaces, so work on frames around New Yatt is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
You’re covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Where
- New Yatt (OX29)
- Region
- Oxfordshire
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
Some jobs are best left to a professional: 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 getting the depth right matters as much as the look.
How to look after the new joints
To keep the joints looking good and working properly:
- Check with your local planning authority if your home is listed
- Ask us before painting near the mastic
- Look over the window mastic once a year
- Keep modern sealant off the mastic
Avoid painting over the new mastic, which is the traditional advice. If you’re redecorating, ask us first.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Frames and glazing around New Yatt
With historic houses such as Minster Lovell Hall (about 3.4 miles west) nearby, there’s older building stock in the area around New Yatt as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Managing a site like North Leigh Church of England (Controlled) School? Then larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as St Mary's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Finstock station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
New Yatt is about 2 miles north-east of Witney, in Oxfordshire. Anywhere in OX29, we cover sand mastic for homes and businesses. We cover 443 towns and villages across Oxfordshire, large and small. Our Oxford page covers work nearby (11 miles or so).
Here we cover the OX29 postcode area for sand mastic. Whether your property is on New Yatt Road and New Yatt Lane or a nearby road, our applicators can take on the job. If you are just outside New Yatt, we cover North Leigh (1 mile east), Poffley End (1 mile west), Delly End (1 mile west), Hailey (2 miles west) and East End (2 miles north-east). Further out, we also cover Oxford (11 miles south-east), Bicester (14 miles north-east), Abingdon-on-Thames (12 miles south-east), Carterton (7 miles south-west), Wantage (15 miles south) and Grove (14 miles south).
Near you in New Yatt
Typical jobs here are in homes near The King's School, Wood Green School and The Saddlers Arms and the streets around them. The nearest railway station is Finstock station, about 2.7 miles north. Other landmarks nearby include Cogges Manor Farm Museum (2.3 miles south-west). Not far away are Blenheim Farm.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to a full day, depending on how many windows from start to finish. Somewhere as small as New Yatt, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
- Clear the area around the work
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.
Read more
Also near New Yatt
Other services in New Yatt
Different surfaces, different methods
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It gives a traditional finish.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
New Yatt questions
Is New Yatt in your area for sand mastic?
Yes, New Yatt is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Is New Yatt within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Can I choose the sealant colour?
We will suggest a colour to suit the surroundings. The choice depends on the product the joint needs.
How long will you be here?
As a guide, most jobs take a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer, and we will tell you how long to expect.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic normally suits period timber windows best. On modern frames, we’d normally use a flexible sealant.
Do you guarantee sand mastic work?
Our 12-month guarantee applies to all our work.
Are you insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Quotes for sand mastic in New Yatt
We don’t publish a price list. What we look at:
- Any working-time requirements on site
- How easy the joints are to reach
- The number and length of the joints
- How many areas need sealing
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- Whether it has been sealed before
- Roughly how big the job is
- Access, such as stairs, a lift or height
- Whether it’s a home or a business
For sand mastic in New Yatt, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before we start.
When it isn’t the sealant
We will always be straight with you, so here’s what new sealant will not do:
- Whether work needs listed building consent
- Sash cords, weights and draught-proofing of the sashes
- Putty and glazing repairs
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Tenement windows
- Period & listed homes
- Timber door frames
- Sash and case windows
- Brick reveals
- Stone surrounds