Oxfordshire · England
Window & door mastic in Sandford St Martin, Oxfordshire
Problem with your window and door frames in Sandford St Martin? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Mastic that’s falling out in pieces
- Water coming in at the bottom corners of a door
- Cold air getting in at the frame edge
What we’re called out for in Sandford St Martin
Mastic ages in the weather. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
Look out for any of the following:
- Gaps left after new windows were fitted
- Draughty joints inside around the window
- Whistling draughts around closed windows
- Hard, cracked sealant around windows
For an older house near a landmark such as Church of St Martin, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- Whether you can choose the colour
- What the quote includes, VAT included or not
- Is the old sealant removed completely?
- What guarantee comes with the work
Window mastic in Sandford St Martin
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that cannot flex, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. We work on window sills, uPVC windows and patio & French doors, and common reasons people get in touch are water coming in at the bottom corners of a door and cold air getting in at the frame edge.
Around Sandford St Martin, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Each job carries a 12-month guarantee.
- Place
- Sandford St Martin (OX7)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Sandford St Martin
Other services in Sandford St Martin
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before work begins. The work normally takes a few hours for a handful of frames, longer for a whole house. Somewhere as small as Sandford St Martin, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
How to prepare
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
Get a quote
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job.
Advice
What affects the quote in Sandford St Martin
The price is agreed before any work begins. It’s based on:
- How easy the joints are to reach
- The product the joint needs
- When we can work, for business premises
- The number and length of the joints
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Helping us quote
You don’t need to know the technical terms. Just tell us:
- The address or postcode of the job
- Any access issues, like height or stairs
- Any previous sealing or DIY work
- Roughly how big the job is
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
When something else is needed
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Draughts through the window seals rather than the frame
- Damp problems in the wall away from the window
- A sash or casement that will not close properly
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Joints and surfaces we work on
- Window sills
- Composite doors
- uPVC windows
- Timber windows & doors
- Patio & French doors
- Aluminium frames
Aftercare tips
A little care helps the new joints last. Our advice:
- Clean frames with a soft cloth and soapy water
- Keep jet washers away from the mastic
- Avoid harsh chemicals near the mastic
- Clear any debris from frame drain holes
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
Surface by surface
Window sills
Stone and concrete sills have their own joints, and the joint under the frame can let rain run behind. We seal those with a sealant suited to masonry.
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
Sandford St Martin: your questions answered
Can you do window mastic in Sandford St Martin?
Yes. We work across London and the South East, and Sandford St Martin is part of that. You can call 0345 464 0079 or email us and let us know what needs doing.
Do you work for landlords with property near Heyford station?
Yes. We work for landlords and letting agents as well as homeowners. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Do you work on first-floor windows?
Yes, if safe access is possible. For high or awkward windows, we will tell you what access is needed.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
How many windows can you do in a day?
The work takes a few hours for a handful of frames, longer for a whole house. Access and the amount of old mastic make the biggest difference.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Is it OK to seal over old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can I paint over the new sealant?
Most silicone can’t be painted. Let us know beforehand, and we will use a paintable product where it suits.
Frames and glazing around Sandford St Martin
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Heyford station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Sandford St Martin is about 9 miles south of Banbury, in Oxfordshire. Sandford St Martin 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, and Sandford St Martin is one of them. There’s also a page for Oxford, roughly 14 miles from Sandford St Martin.
Here we cover the OX7 postcode area for window mastic. We cover properties on Mill Lane, Manor Road and Ledwell Road and the roads around them. Nearby, we also carry out window mastic in Westcott Barton (1 mile south-east), Middle Barton (1 mile east), Nether Worton (2 miles north), Steeple Barton (2 miles south-east) and Duns Tew (3 miles north-east). We also work in nearby towns such as Oxford (14 miles south-east), Banbury (9 miles north), Bicester (10 miles east), Witney (11 miles south-west), Carterton (15 miles south-west) and Kidlington (9 miles south-east).
Local landmarks in Sandford St Martin
Around Sandford St Martin, our work takes us to homes and buildings near The Fox Public House and the streets around them. Sandford St Martin’s nearest station is Heyford station, roughly 4.1 miles east of the centre. Well-known places in the area include Deddington Castle (4.5 miles north-east) and Old Forge Museum (Great Tew) (2.3 miles north-west).
Landlords, agents and businesses in Sandford St Martin
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We work for letting agents and landlords as well as householders. Sealant work between tenants keeps a property looking cared for.