Oxfordshire · England
Window Mastic in Dean Court
Window mastic for Dean Court and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Draughts coming in around windows and doors
- Damp patches on the reveal after heavy rain
- Cracked or shrunken mastic around the frame
Window mastic for homes and businesses in Dean Court
Frames and walls do not move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on window sills, aluminium frames and composite doors, and the jobs we see most are a bead that doesn’t match the frame and untidy mastic left by window fitters.
In smaller places like Dean Court, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Place
- Dean Court (OX2)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
On the day, we look over the joints with you first. Surfaces next to the work are protected before any work begins. The work usually takes most of a day for a typical house, less for a few frames. For a job in Dean Court, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- Tell us if parking is tricky
- Clear the area around the work
- Let us know about earlier repairs to the joints
How to get a quote
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before we start.
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What else we do in Dean Court
What happens if it’s left?
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It peels before long, and water still gets in behind. The old mastic has to come out. In an older home around Dean Court, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
Combining jobs into one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What you get with us
- Rated 4.9 stars on Google
- Colour picked to suit the job
- Every job guaranteed for a year
- Over 20 years’ experience
Honest limits
We’ll always be straight with you, so here’s what sealant can’t fix:
- Damp problems in the wall away from the window
- A frame that has rotted at the joint
- A failed sealed unit that has misted up
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Window sills
- Composite doors
- Patio & French doors
- Timber windows & doors
- uPVC windows
- Aluminium frames
Window mastic in Dean Court: local notes
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. With historic houses such as Holywell Manor (about 2.7 miles east) nearby, there’s older building stock in the area around Dean Court as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Schools such as Matthew Arnold School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Oxford station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Dean Court is about 3 miles west of Oxford, in Oxfordshire. If you need window mastic in Dean Court, please phone 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Oxfordshire. Dean Court is one of 443 places in Oxfordshire we cover.
Work in OX2 works the same way as everywhere else we cover. You will find streets such as Green Lane, Hazel Road and Poplar Road, and we cover them all. Other places close to Dean Court include Botley (1 mile east), Chawley (1 mile south-west), Filchampstead (1 mile west), Cumnor (2 miles south-west) and Farmoor (2 miles north-west). Larger places within reach include Oxford (3 miles east), Didcot (10 miles south), Bicester (12 miles north-east), Abingdon-on-Thames (5 miles south), Witney (8 miles west) and Carterton (12 miles west).
What’s near Dean Court
Locally, jobs take us to homes and businesses close to The Seacourt Bridge pub, Raleigh Park and Botley School and the streets around them. For rail, the closest station is Oxford station, roughly 1.7 miles east of the centre. Other landmarks nearby include Radcliffe Infirmary (2.2 miles east) and Oxford University Press Museum (2 miles east). Green spaces nearby include Harcourt Hill and Hook Meadow and The Trap Grounds.
Dean Court questions
Will you come out to Dean Court?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you cover Dean Court for window mastic?
Yes. Our work covers London and the South East, and Dean Court is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Can you match the sealant to my frames?
Yes. We can use white, brown, anthracite grey, black or clear.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Where is Mr Mastic based?
We’re based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you do several jobs on one visit?
Yes, we can. More than one area can be quoted together.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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.
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Walk round the house once a year and look at the joints
- Do not use solvent cleaners on the joint
- Do not paint over the silicone
- Keep paint and stain on wooden frames in good order
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
Do you need window mastic in Dean Court?
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, and it lets go sooner than it should.
Signs it’s time to call us include:
- Damp patches on the reveal after heavy rain
- Mastic that is falling out in pieces
- Untidy mastic left by window fitters
- Sealant in the wrong colour for the frame
Homes close to St Andrew's include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before you book anyone
- What product goes in the joint
- How the joint is cleaned and prepared
- Whether you can choose the colour
- Whether VAT is included
Landlords, agents and businesses in Dean Court
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.