Oxfordshire · England
Sand mastic for sash & case windows in Upper Heyford, Oxfordshire
We cover Upper Heyford for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Wind and rain getting in round a sash window
- Patchy fillers round a sash window
- Mastic that needs renewing before redecorating
How we handle sand mastic in Upper Heyford
We work across Upper Heyford renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand for a neat, traditional finish. Typical jobs include old cement repairs round a window that have failed and failed mastic on an exposed elevation, on tenement windows, period & listed homes and brick reveals.
Around Upper Heyford, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows.
We stand behind the work with a 12-month guarantee.
- Location
- Upper Heyford (OX25)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for sand mastic
Your quote is based on your job. We take into account:
- When we can work, for business premises
- The amount of work
- Which sealant suits the joint
- Any mould that needs treating
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Helping us quote
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- How we’d reach the joints
- What’s wrong with the joints now
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.
The process
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours per window, depending on the condition of the joints, including the tidy-up. Parking around Upper Heyford is normally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
Get a quote
For sand mastic in Upper Heyford, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Read more
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Leave the new mastic unpainted
- Ask a joiner to look at soft timber first
- Look over the window mastic once a year
- Find out about consent before window work on a listed home
Leave the new mastic alone while it firms up. It skins over quickly, but takes longer to harden fully.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger as more mastic falls out.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Places near Upper Heyford
Other services in Upper Heyford
Common problems we fix in Upper Heyford
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
These are the problems we’re asked about most:
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
- Failed mastic on an exposed elevation
- Cracked mastic round a front door frame
Letting a property close to Heyford station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- Who turns up on the day
- When the joint can take water or movement
- What insurance they hold
- What the quote includes, VAT included or not
Frames and glazing around Upper Heyford
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Heyford Park Chapel, the joint between an old wall and a newer frame is normally the first place rain gets in.
Upper Heyford is about 5 miles west of Bicester, in Oxfordshire. Every kind of property in Upper Heyford is covered for sand mastic. The work is guaranteed for a year. Our area takes in 443 places across Oxfordshire, large and small. Our Oxford page covers work nearby, about 12 miles away.
Every address in OX25 is within our area for sand mastic, from the main roads to the quietest streets. Streets in the area include Hampden Square, High Street and Gordon Road, all of which we cover. Other places close to Upper Heyford include Caulcott (1 mile south), Lower Heyford (1 mile south-west), Middleton Stoney (2 miles south-east), Somerton (2 miles north) and Ardley (2 miles north-east). Further out, we also cover Oxford (12 miles south), Banbury (10 miles north), Bicester (5 miles east), Witney (14 miles south-west), Kidlington (7 miles south) and Headington Quarry (12 miles south).
Near you in Upper Heyford
In Upper Heyford, that means homes and buildings near Barley Mow pub and the streets around them. For rail, the closest station is Heyford station, roughly 1.8 miles west. Nearby you’ll also find Bicester Community Hospital (4.8 miles south-east) and Ardley Castle (2 miles north-east).
How the job changes by surface
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Upper Heyford questions
Do you cover Upper Heyford for sand mastic?
Yes. We work across London and the South East, and Upper Heyford is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Can you help a landlord with a rental near Heyford station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected.
Will there be a smell?
There can be a smell while the sealant cures. Opening a window helps.
How long does sand mastic take?
That depends on how much there is to do, but most jobs take a few hours for a single window, longer for several. We’ll tell you when we quote.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint before the sand mastic goes in.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.