Oxfordshire · England
Sand mastic for sash & case windows in Eynsham, Oxfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Eynsham, backed by a 12-month guarantee. Call for a quick quote.
- Mastic dropping out of the joint
- Silicone on a period window that looks wrong
- Wind and rain getting in round a sash window
When to call us in Eynsham
Previous repairs in cement or silicone often trap water or crack away. They don’t suit the joint and we normally remove them.
Keep an eye out for these signs:
- Old sand mastic that has cracked, crumbled or fallen out
- Modern sealant on a period surround
- Draughty sash windows at the surround
- Gaps round a timber door in stone or brick
Schools such as Bartholomew School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Before booking anyone
- How the colour is chosen
- What the cure time is
- How much experience the applicator has
- How the joint is cleaned and prepared
Sand mastic for homes and businesses in Eynsham
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. Typical jobs include modern sealant on a period surround and weathered mastic on the most exposed windows, on stone surrounds, tenement windows and brick reveals.
Many houses in smaller places like Eynsham have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Location
- Eynsham (OX29)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Windows and doors in Eynsham
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Blenheim Palace (about 4.1 miles north) are a reminder that the area around Eynsham has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Hanborough station, cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to Church of St Leonard include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Eynsham is about 5 miles east of Witney, in Oxfordshire. If you need sand mastic in Eynsham, it’s easy to get a quote: please phone 0345 464 0079 or email us. We cover Oxfordshire from our Crawley base, Eynsham included. Across Oxfordshire, we cover 443 places, and Eynsham is one of them. There’s also a page for Oxford, about 7 miles away.
Jobs for sand mastic in OX29 works the same way as everywhere else we cover. If you need sand mastic at a property on High Street, Station Road and Back Lane or anywhere close by, our applicators can take on the job. Other places close to Eynsham include Swinford (1 mile south-east), Cassington (2 miles north-east), Farmoor (2 miles south-east), Sutton (2 miles south-west) and Filchampstead (3 miles south-east). We also work in nearby towns such as Oxford (7 miles east), Didcot (13 miles south-east), Bicester (13 miles north-east), Abingdon-on-Thames (8 miles south-east), Witney (5 miles west) and Carterton (9 miles west).
Landmarks near Eynsham
Around Eynsham, our work takes us to homes and buildings near The Jolly Sportsman Public House And Attached Outbuildings and Eynsham Community Primary School. Eynsham’s nearest station is Hanborough station, roughly 2.9 miles north of the centre. Other landmarks nearby include Radcliffe Infirmary (5.1 miles east) and Oxford Bus Museum (3 miles north). For a walk, there’s Cumnor Hill and Hook Meadow and The Trap Grounds.
What the job involves on each surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Keep modern sealant off the mastic
- Look over the window mastic once a year
- Have rotten timber repaired before new mastic goes in
- Clear gutters so water does not pour onto the windows
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
What happens if it’s left?
Not every filler suits an old window surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. Around Eynsham, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why Eynsham customers choose us
- More than 20 years in sealant work
- Every job guaranteed for a year
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
Take a look at how sealant jobs are priced or what customers say.
Towns and villages near Eynsham
More services for Eynsham
Questions from Eynsham
I let a flat near Hanborough station. Can you help?
Yes. We work for landlords and agents as well as householders. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can you do sand mastic in Eynsham?
Yes. We work across London and the South East, and Eynsham is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
Is consent needed for window work on a listed home?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.
Do you guarantee sand mastic work?
You get our 12-month guarantee to all our work.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few photos.
Are you fully insured?
Yes. Mr Mastic is fully insured.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then 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 does not work out, we can still put it right.
Landlord and commercial work in Eynsham
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to a full day, depending on how many windows, and the area is left clean. For a job in Eynsham, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
Get a quote
Need a quote? Please ring 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before we start.