Oxfordshire · England
Window Mastic in Steventon
Window and door frames in Steventon need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Gaps left after new windows were fitted
- Cold air getting in at the frame edge
- Hard, cracked sealant around windows
Window mastic in Steventon
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. Common call-outs are for mastic that has split away from the wall and cracked sealant at the sill ends, across window sills, timber windows & doors and composite doors.
Somewhere as small as Steventon, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Big or small, it’s backed by our one-year guarantee in Steventon and across Oxfordshire.
- Place
- Steventon (OX13)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. Older cottages and farmhouses around Steventon can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Steventon
- Experience in homes, commercial sites and hotels
- 20+ years of sealant experience
- Quality sealants from Arbo and Everbuild
- We agree the colour with you first
Read how sealant jobs are priced and our reviews.
Also near Steventon
More services for Steventon
What we do, step by step
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes a morning for a couple of windows and a door for a typical job. In a small place like Steventon, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
- Mention if the joints have been sealed before
Getting a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job.
Related advice
What the job involves on each surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones are not used, as they can attack some metals. We use a neutral-cure product.
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
FAQs for Steventon
Can you do window mastic in Steventon?
Yes. We work across London and the South East, and Steventon is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Can you help a landlord with a rental near Didcot Parkway station?
Yes. We work for landlords and agents as well as householders. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Which products do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
How long will my window job take?
It depends on access, the old mastic and the size of the frames. We’ll tell you how long your job needs when we quote.
Can I paint over the new sealant?
Not if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
When to call us in Steventon
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
The most common problems we see are:
- Cracked or shrunken mastic around the frame
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
- Leaking joints at the ends of sills
For landlords with property near Didcot Parkway station, renewing tired window mastic between tenants heads off draught and damp complaints.
Questions to ask before you book
- What happens if the job turns out different
- Who turns up on the day
- What product goes in the joint
- Whether they’re fully insured
Landlords, agents and businesses in Steventon
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
How to look after the new joints
Looking after new joints is easy:
- Walk round the house once a year and look at the joints
- Ventilate rooms so frames do not stay wet inside
- Clean frames with a soft cloth and soapy water
- Keep paint and stain on wooden frames in good order
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Leaks generally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
When something else is needed
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Damp problems in the wall away from the window
- A door that needs adjusting, rehanging or new seals
- A frame that has rotted at the joint
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
Surfaces we seal
- Timber windows & doors
- Aluminium frames
- uPVC windows
- Window sills
- Patio & French doors
- Composite doors
Frames and glazing around Steventon
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like St Michael's Church of England Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Homes close to Church of St Michael and All Angels include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Steventon is about 3 miles west of Didcot, in Oxfordshire. Whether you are in the middle of Steventon or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Steventon is one of 443 towns and villages in Oxfordshire where we work. For nearby work, see our Oxford page.
Postcode districts we cover here for window mastic: OX13. If you need window mastic at a property on High Street, St Michael's Way and Hanney Road or anywhere close by, our applicators can take on the job. Other places close to Steventon include Milton Heights (1 mile south-east), Milton Hill (1 mile south-east), Drayton (2 miles north), Sutton Wick (2 miles north-east) and Marcham (3 miles north). We also work in nearby towns such as Oxford (10 miles north-east), Didcot (3 miles east), Abingdon-on-Thames (4 miles north-east), Witney (13 miles north-west), Carterton (15 miles north-west) and Wantage (5 miles south-west).
Landmarks near Steventon
We work in homes and buildings around The North Star Public House. The closest station to Steventon is Didcot Parkway station, roughly 3.6 miles east. Nearby you will also find FitzHarris Castle (3.9 miles north-east) and Atlas Computer Laboratory (3.5 miles south). The countryside around Steventon includes Chain Hill and Mowbray Fields.