Windsor and Maidenhead · England
Dorney Window Mastic
Mastic around window and door frames, sills and patio doors in Dorney, with a 12-month guarantee on every job. Call for a quick quote.
- Gaps where the sill meets the wall
- Sealant in the wrong colour for the frame
- Mastic that is falling out in pieces
Why it’s worth doing now in Dorney
Draughts and leaks do not always mean new windows. Where the frames are sound, new mastic usually deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. Older cottages and farmhouses around Dorney can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Why Dorney clients choose us
- Neat joints and a tidy finish
- You choose the colour before work begins
- Colour picked to suit the job
- Homes, businesses and hotels
See our cost guide or our reviews.
Window mastic in Dorney, done properly
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. If you are dealing with gaps between the frame and the inside reveal and whistling draughts around closed windows, we can put it right, whatever the surface.
Around Dorney, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Dorney (SL4)
- Wider area
- Windsor and Maidenhead
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Dorney
Other services in Dorney
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Avoid harsh chemicals near the mastic
- Paint up to the joint, not over it
- Repaint timber before it’s bare
- Clean frames with a soft cloth and soapy water
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.
How the job changes by surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
Dorney questions
Is Dorney within the area you cover?
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.
Is Dorney in your area for window mastic?
Yes. Our work covers London and the South East, and Dorney is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do you have sealant for grey or black windows?
Yes, we choose a colour to suit the frame. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
How do I get a quote for window mastic in Dorney?
It depends on the job, so we quote each one individually. To get one, ring 0345 464 0079 or email us and let us know what needs doing and where.
Can you do the inside joint as well?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
When is the sealant fully cured?
Cure times vary by product and the temperature. Before we leave, we will tell you the cure time.
When to call us in Dorney
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, and it lets go sooner than it should.
It’s worth asking for a quote if you see:
- Whistling draughts around closed windows
- Leaking joints at the ends of sills
- Draughty joints inside around the window
- Rain getting in at the frame or under the sill
If you let a flat or house near Burnham station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Questions to ask before you book
- How much experience the applicator has
- When the joint can take water or movement
- Whether they seal over old material or remove it
- Whether they’re fully insured
How it works
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from an hour or two to a full day, depending on how many frames there are. Somewhere as small as Dorney, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
How to get a quote
For window mastic in Dorney, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Advice
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Window mastic in Dorney: local notes
Historic houses like Dorney Court (about 0.5 miles west) are a reminder that the area around Dorney has older buildings as well as new. In older buildings, 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St James, the joint between an old wall and a newer frame is generally the first place rain gets in. If you look after a building such as Western House Academy, the mastic around its windows and doors needs looking after like any other building’s.
Dorney is about 2 miles north-west of Windsor, in Windsor and Maidenhead. Jobs in Dorney get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 57 places in Windsor and Maidenhead are on our list, from the larger towns to small villages. We also work in Reading, about 14 miles from Dorney.
Work in SL4 works the same way as everywhere else we cover. Whether your property is on Common Road, Village Road and Boveney Road or a nearby road, we can help. We also cover the places around Dorney: Lake End (1 mile north-west), Dorney Reach (1 mile west), Cippenham (1 mile north-east), Huntercombe (1 mile north) and Bray (2 miles west). We also work in nearby towns such as Maidenhead (4 miles west), Boyn Hill (4 miles west), North Ascot (6 miles south), Cookham (5 miles north-west), Furze Platt (4 miles north-west) and Broomhall (8 miles south).
Local landmarks in Dorney
In Dorney, that means homes and buildings near The Westgate School, Sutherland Grange and Westgate School and the streets around them. Dorney’s nearest station is Burnham station, about 1.4 miles north of the centre. Nearby you’ll also find Upton Hospital (2.7 miles east) and The History On Wheels Museum (1.2 miles east). Not far away are Bray Pit and Taplow Lake.
What we can’t put right
We won’t take on work that won’t last, so these are the limits:
- Draughts through the window seals rather than the frame
- Faulty window hardware
- Condensation trapped between the panes
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Composite doors
- Window sills
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- uPVC windows