Oxfordshire · England
Window Mastic in Long Wittenham
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Long Wittenham. Fully insured, ARBOMaster approved and guaranteed for a year.
- White mastic on grey or black frames
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
Window mastic in Long Wittenham, done properly
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. If you’re dealing with cracked internal joints between frame and plaster and draughts coming in around windows and doors, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around Long Wittenham is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Long Wittenham (OX14)
- Wider area
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- A frame that has rotted at the joint
- A door that needs adjusting, rehanging or new seals
- Damp coming through the wall itself rather than the frame joint
If in doubt, call 0345 464 0079 or send us an email and we will say what we think before you book.
Where we work in Long Wittenham
- Aluminium frames
- Composite doors
- uPVC windows
- Patio & French doors
- Window sills
- Timber windows & doors
How the job changes by surface
Composite doors
Draughts round the door leaf generally come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. We cut it out, back any deep gaps and reseal properly.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Do not aim a pressure washer at the joints
- Don’t paint over the silicone
- Wipe condensation off the frames
- Clear any debris from frame drain holes
Try not to touch the new joint while it cures, for as long as we advise. Don’t point a pressure washer at the joints.
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 it pays to reseal before that happens.
Leave it or put it right?
If you’re painting or rendering, reseal at the same time. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. Older cottages and farmhouses around Long Wittenham can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts.
Why Long Wittenham customers choose us
- A sealant colour to suit the surroundings
- Arbo and Everbuild products
- 180+ five-star Google reviews
- Every job guaranteed for a year
See what affects the cost and what customers say.
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes most of a day for a typical house, less for a few frames. Somewhere like Long Wittenham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- 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.
Before we arrive
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
How to get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
Read more
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
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FAQs for Long Wittenham
Can you do window mastic in Long Wittenham?
Yes, Long Wittenham is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Can you help a landlord with a rental near Appleford station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
What information do you need?
Tell us what needs doing and where. We’ll ask anything else we need to know.
Are you insured?
Yes. We’re fully insured for domestic and commercial work.
Will new mastic stop draughts?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
Is the new sealant paintable?
Not if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
What does window mastic cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or email us with a short description of the job.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done.
Long Wittenham homes and the weather
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Clifton Hampden Manor (about 1.2 miles north) are a reminder that the area around Long Wittenham has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Rented homes near Appleford station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. In the older streets around Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Long Wittenham is about 3 miles north-east of Didcot, in Oxfordshire. For window mastic in and around Long Wittenham, please ring 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Oxfordshire. We cover 443 towns and villages across Oxfordshire. There’s also a page for Oxford, roughly 8 miles from Long Wittenham.
We cover every part of OX14 for window mastic. Streets in the area include High Street, Didcot Road and Wessex Way, and we cover them all. We also cover the places around Long Wittenham: Clifton Hampden (1 mile north), Appleford-on-Thames (1 mile west), Culham (2 miles north-west), Didcot (3 miles south-west) and Sutton Courtenay (3 miles west). We also work in nearby towns such as Oxford (8 miles north), Abingdon-on-Thames (4 miles north-west), Thame (13 miles north-east), Wantage (10 miles west), Henley-on-Thames (15 miles south-east) and Grove (9 miles west).
What’s near Long Wittenham
In Long Wittenham, that means homes and buildings near The Plough Public House. For rail, the closest station is Appleford station, about 1.3 miles west of the centre. A little further out are Brightwell Castle (2.6 miles south-east) and Pendon Museum (within half a mile west). The countryside around Long Wittenham includes Wittenham Clumps and Mowbray Fields.
Common problems we fix in Long Wittenham
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
Signs it’s time to call us include:
- A bead that does not match the frame
- Hard, cracked sealant around windows
- Mastic that is falling out in pieces
- Water coming in at the bottom corners of a door
If you look after a building such as Long Wittenham (Church of England) Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- The length of the guarantee
- Who does the work, and how experienced they are
- Whether VAT is included
- What happens if the job turns out different