Oxfordshire · England
Window & door mastic in Cowley, Oxfordshire
Our applicators work in Cowley on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Old mastic that has gone black or come away
- Cracked or shrunken mastic around the frame
- Leaking joints at the ends of sills
What happens on the day
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself normally takes a few hours for a handful of frames, longer for a whole house, depending on how much there is to do. In a smaller place like Cowley, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
- Tell us about any water getting in
How to get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Read more
How we handle window mastic in Cowley
There are two joints on most windows. The external joint is the weather seal; inside, the joint between frame and plaster stops draughts and tidies the reveal. Either or both can be done. We work on composite doors, window sills and patio & French doors, and people most often call us about rushed sealant from a window installation and hard, cracked sealant around windows.
Around Cowley, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Where
- Cowley (OX4, OX3)
- Region
- Oxfordshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in Cowley
Mastic ages in the weather. Sunlight dries the surface out, until it loses its stretch and starts to crack.
Most people get in touch after spotting one of these:
- Hard, cracked sealant around windows
- Draughts coming in around windows and doors
- Draughty joints inside around the window
- Rain getting in at the frame or under the sill
For an older house near a landmark such as Church of St Luke, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- What insurance they hold
- What guarantee comes with the work
- How hidden problems are handled
- How the colour is chosen
When something else is needed
To be straight with you, there are a few things sealant will not fix:
- Faulty window hardware
- Damp coming through the wall itself rather than the frame joint
- Rotten timber, which needs a joiner first
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Window sills
- Composite doors
- Patio & French doors
- uPVC windows
- Aluminium frames
- Timber windows & doors
Windows and doors in Cowley
With historic houses such as Holywell Manor (about 2.1 miles north-west) nearby, there’s older building stock in the area around Cowley as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Oxford station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as Our Lady's Roman Catholic Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Cowley is about 1 mile south-east of Oxford, in Oxfordshire. Wherever you are in the OX4 postcode area, we cover window mastic for homes and businesses. Across Oxfordshire, we cover 443 places, and Cowley is one of them.
Our applicators cover all of the OX4 and OX3 postcode area for window mastic. We cover properties on Barns Road, Marsh Road and Clive Road and the roads around them. Close by, we work in Iffley (1 mile west), Blackbird Leys (1 mile south), Donnington (1 mile north-west), Littlemore (1 mile south-west) and Oxford (1 mile north-west). Larger places within reach include Didcot (9 miles south), Bicester (12 miles north), Abingdon-on-Thames (5 miles south-west), Witney (12 miles west), Thame (10 miles east) and Wantage (13 miles south-west).
Around Cowley
In Cowley, that means homes and buildings near The Nelson pub, South Park and Emmanuel Christian School and the streets around them. You’ll also find Greyfriars Catholic School (0.6 miles north-west) and Alexander Library of Ornithology (1.9 miles north-west). For rail, the closest station is Oxford station, about 2.7 miles north-west of the centre. Nearby you will also find Templars Square (under half a mile south-west) and British Tattoo History Museum (0.7 miles north-west). Green spaces nearby include Headington Hill and CS Lewis Nature Reserve.
Quotes for window mastic in Cowley
Call for a quick quote. The main things that affect it are:
- The number of rooms or windows
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- Working hours on commercial sites
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What we need to know
Before you ask for a quote, have a think about:
- The rough size of the job
- A few pictures by email, if you can
- The address or postcode of the job
- Any access issues, like height or stairs
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we’ll take it from there.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Check the mastic once a year
- Repaint timber before it’s bare
- Avoid blasting the frames with a pressure washer
- Air rooms to keep condensation down around windows
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just call 0345 464 0079 or send us an email.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
FAQs for Cowley
Do you cover Cowley for window mastic?
Yes. Our work covers London and the South East, and Cowley is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
I let a flat near Oxford station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
How many windows can you do in a day?
A handful of frames is a short visit. You’ll get a timescale with the quote.
Can I add another job to the visit?
Yes. Just list everything you need and you will get one quote.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Are you insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Why act early in Cowley
Running fresh sealant over the old joint is tempting, but new sealant cannot bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. In a smaller place like Cowley, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
Why us?
- An ARBOMaster approved applicator
- We are fully insured
- Rated 4.9 stars on Google
- Any old sealant cut out fully, not covered over
Read what affects the cost or what customers say.
Towns and villages near Cowley
Also in Cowley
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.