Oxfordshire · England
Sand mastic for sash & case windows in Somerton, Oxfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Somerton and across Oxfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cement or filler used on old window joints that has cracked
- Window mastic to renew ahead of painting
- Mastic round period door frames that has failed
About our sand mastic in Somerton
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 and built up by hand. On older homes, it suits the building far better than silicone. If you have gaps where the frame meets the masonry and gaps round a timber door in stone or brick, we can help.
Homes in small places like Somerton often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Big or small, it’s backed by our 12-month guarantee in Somerton and across Oxfordshire.
- Location
- Somerton (OX25)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Frames and glazing around Somerton
The South East is one of the drier parts 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 St James include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Somerton is about 6 miles north-west of Bicester, in Oxfordshire. Wherever you are in the OX25 postcode area, our applicators can take on sand mastic. Our Oxfordshire coverage runs to 443 places, and Somerton is one of them. Our Oxford page covers work nearby, about 14 miles away.
Our applicators cover all of OX25 for sand mastic. You’ll find streets such as Water Street, Wharf Lane and Ardley Road, and we cover them all. Nearby, we also carry out sand mastic in Fritwell (2 miles east), Clifton (2 miles north), Upper Heyford (2 miles south), Souldern (2 miles north-east) and Lower Heyford (3 miles south). Larger places within reach include Oxford (14 miles south), Banbury (8 miles north), Bicester (6 miles south-east), Witney (15 miles south-west), Kidlington (9 miles south) and Headington Quarry (14 miles south).
Around Somerton
The nearest railway station is Heyford station, about 2.7 miles south. A little further out are Deddington Castle (2.4 miles north-west).
How we quote for sand mastic
Every job gets its own quote. This is what makes a difference:
- How easy the joints are to reach
- Whether there’s mould to deal with
- The size of the job
- Working hours on commercial sites
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- What’s wrong with the joints now
- Roughly how big the job is
- How we’d reach the joints
- Where the job is, and your postcode
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Somerton: your questions answered
Do you work for landlords with property near Heyford station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Will you come out to Somerton?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Where are you based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They decide whether consent is needed for work to your windows.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Do you need sand mastic in Somerton?
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows.
Keep an eye out for these signs:
- Crumbling sand mastic round a window
- Modern sealant on a period surround
- Failed mastic on an exposed elevation
- Gaps round a timber door in stone or brick
Rented homes near Heyford station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Comparing quotes
- Which colour the sealant will be
- Whether all the old sealant comes out first
- How long the guarantee is
- How the joint is cleaned and prepared
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
How it works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a single window, longer for several. For a village or hamlet like Somerton, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided 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.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Try not to wet indoor joints just before the visit
How to get a quote
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job.
Advice
What happens if it’s left?
New sash windows are a major, costly change and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. Where a wall is exposed, as many are in small places like Somerton, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why us?
- 180+ five-star Google reviews
- Domestic, commercial and hotel work
- Tidy, careful work
- We never seal over old sealant
What we can’t put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Putty and glazing repairs
- Sashes that need overhauling
- Crumbling stone or brickwork round the window
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Tenement windows
- Sash and case windows
- Brick reveals
- Timber door frames
- Stone surrounds
- Period & listed homes
Keeping the joints in good condition
After the cure time, these simple habits help:
- Inspect the joints round the windows every year or so
- Make sure water runs off the sill
- Find out about consent before window work on a listed home
- Get any rot dealt with first
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.