Oxfordshire · England
Window & door mastic in Wantage, Oxfordshire
Problem with your window and door frames in Wantage? We cut out the old, prepare the joints and apply the right sealant.
- Mastic that’s falling out in pieces
- A bead that doesn’t match the frame
- Gaps left after new windows were fitted
How we handle window mastic in Wantage
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. If you have cracked internal joints between frame and plaster and cold air getting in at the frame edge, we can put it right, whatever the surface.
Wantage mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. All of them depend on a sound bead of mastic between frame and wall.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Place
- Wantage (OX12)
- Wider area
- Oxfordshire
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need window mastic in Wantage
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, so it comes away long before its time.
People generally contact us when they notice something like this:
- Gaps left after new windows were fitted
- A bead that does not match the frame
- Water coming in at the bottom corners of a door
- Leaking joints at the ends of sills
For an older house near a landmark such as Church of St Peter and St Paul, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- What insurance they hold
- Who turns up on the day
- What the cure time is
- How the joint is cleaned and prepared
How the job changes by surface
uPVC windows
The frame is cleaned with a product that won’t harm the plastic, then the new bead is laid against the frame and the wall.
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. If we find rot, we’ll tell you before going ahead, as that is a job for a joiner.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Repaint timber before it’s bare
- Avoid harsh chemicals near the mastic
- Ventilate rooms so frames don’t stay wet inside
- Keep paint off silicone joints
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
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.
Common questions in Wantage
Is window mastic in Wantage guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Do you cover Wantage for window mastic?
Yes. Our work covers London and the South East, and Wantage is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Wantage and the rest of Oxfordshire, along with the rest of our area.
How long will my window job take?
That depends on the number of frames, how they’re reached and the state of the old mastic. You’ll know the timing when we quote.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we have agreed the job, you don’t need to watch us work.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Honest limits
New sealant can’t fix everything, and we’d rather say so up front. It will not solve:
- Broken hinges, locks or handles
- A door that needs adjusting, rehanging or new seals
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before you book.
What we seal
- Window sills
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Composite doors
- Patio & French doors
Quotes for window mastic in Wantage
Jobs vary more than people expect. The main factors:
- Any mould that needs treating
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Helping us quote
When you call or email, it’s useful to know:
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- Any previous sealing or DIY work
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job.
What we do, step by step
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours for a handful of frames, longer for a whole house. For a job in Wantage, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
How to prepare
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Clear the area around the work
Getting a quote
For a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
Read more
Nearby places to Wantage
Other services in Wantage
Wantage homes and the weather
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.
For site and facilities teams at buildings such as St Mary's School, its window and door frames need their mastic kept sound, just like a home’s.
Wantage is about 8 miles west of Didcot, in Oxfordshire. Across the OX12 area, our applicators can take on window mastic. Wantage is one of 443 towns and villages in Oxfordshire we cover for window mastic. You can also see our page for Oxford, about 14 miles away.
Every address in OX12 is within our area for window mastic, from the main roads to the quietest streets. You’ll find streets such as Market Place, Limborough Road and Humber Close, and we cover them all. Being close to the A338 and A417, Wantage is simple for us to get to. We also cover the places around Wantage: Charlton (1 mile east), East Challow (1 mile west), Letcombe Regis (2 miles south-west), West Challow (2 miles west) and Childrey (2 miles west). Within a short drive, we also cover Oxford (14 miles north-east), Didcot (8 miles east), Abingdon-on-Thames (8 miles north-east), Witney (14 miles north), Carterton (14 miles north-west) and Faringdon (8 miles north-west). As one of the bigger places in Oxfordshire, Wantage has every kind of property, from flats to offices.
Local landmarks in Wantage
In Wantage, that means homes and buildings near King Alfred's, Betjeman Millennium Park and The Abingdon Arms, among other places. Other landmarks nearby include Williams F1 Grand Prix Collection (1.9 miles north). Open spaces near Wantage include Letcombe Valley and Chain Hill.