Windsor and Maidenhead · England
Old Windsor Window Mastic
Our applicators work in Old Windsor on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Rain getting in at the frame or under the sill
- A bead that does not match the frame
- Gaps left after new windows were fitted
Window mastic in Old Windsor, done properly
If you can feel air around a shut window, the gap is often at the frame. A new joint stops the air getting through and quietens the whistle on windy days. If the draught is through the window seals instead, we’ll tell you. If you have rain getting in at the frame or under the sill and whistling draughts around closed windows, we can put it right, on patio & French doors, uPVC windows and composite doors alike.
Houses in smaller places like Old Windsor can stand more in the open than those in a built-up town. That is hard on the mastic around frames and sills.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Location
- Old Windsor (SL4)
- Region
- Windsor and Maidenhead
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Different surfaces, different methods
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We look for the cause first.
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall and tooled smooth.
Towns and villages near Old Windsor
What else we do in Old Windsor
Common questions in Old Windsor
Is Old Windsor in your area for window mastic?
Yes. We work across London and the South East, and Old Windsor is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
I let a flat near Sunnymeads station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Is it messy?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Can new window sealant be painted?
Not generally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Can you do several jobs on one visit?
Yes. Just list everything you need.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses and we are fully insured.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
When something else is needed
Before booking, it’s worth knowing the limits too:
- A failed sealed unit that has misted up
- A sash or casement that won’t close properly
- A frame that has rotted at the joint
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Surfaces we seal
- Composite doors
- Patio & French doors
- uPVC windows
- Window sills
- Aluminium frames
- Timber windows & doors
Quotes for window mastic in Old Windsor
Every job gets its own quote. This is what makes a difference:
- When we can work, for business premises
- How easy the joints are to reach
- The number of rooms or windows
- Any mould that needs treating
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Asking for a quote
What to tell us when you ask for a quote:
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- How we’d reach the joints
- Whether it has been sealed before
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
How it works
We keep the work tidy and contained to the area we are working on, so you can get on with your day. The job normally takes a morning for a couple of windows and a door, and we tell you how long to leave it before we go. Parking around Old Windsor is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Related advice
What window mastic looks like in Old Windsor
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Frogmore House (about 1.3 miles north-west) are a reminder that the area around Old Windsor 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.
For an older house near a landmark such as St Luke, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like King's Court First School? Then its window and door frames need their mastic kept sound, just like a home’s.
Old Windsor is about 2 miles north-west of Egham, in Windsor and Maidenhead. From the centre of Old Windsor to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Old Windsor is one of 57 towns and villages in Windsor and Maidenhead we cover for window mastic. There’s also a page for Reading, about 17 miles away.
Jobs for window mastic in SL4 is quoted and booked the same way as anywhere else. Whether your property is on Church Road, Parker Gardens and Gregory Drive or a nearby road, our applicators can take on the job. Old Windsor sits on or near the B3021, so getting to you is simple. Neighbouring places we cover for window mastic include Wraysbury (1 mile east), Sunnymeads (1 mile north-east), Bishopsgate (1 mile south), Datchet (2 miles north) and Englefield Green (2 miles south). Larger places within reach include Maidenhead (8 miles north-west), Windsor (3 miles north-west), Boyn Hill (8 miles north-west), North Ascot (6 miles south-west), Cookham (9 miles north-west) and Furze Platt (9 miles north-west).
Landmarks near Old Windsor
We work in homes and buildings around St John's Beaumont School, Windsor Great Park and The Fox And Castle Public House, among other places. Old Windsor’s nearest station is Sunnymeads station, roughly 1.3 miles north-east of the centre. Other landmarks nearby include Windsor Castle (2.1 miles north-west) and Berkshire Yeomanry Museum (1.6 miles north-west). The countryside around Old Windsor includes St Ann's Hill and Virginia Water Lake.
When to call us in Old Windsor
Mastic ages in the weather. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
Most people get in touch when they notice something like this:
- Draughty joints inside around the window
- Sealant in the wrong colour for the frame
- Hard, cracked sealant around windows
- Black, perished sealant on frames
Rented homes near Sunnymeads station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Before booking anyone
- Who does the work, and how experienced they are
- What guarantee comes with the work
- Is the old sealant removed completely?
- Are they insured?
What happens if it’s left?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Homes in smaller places like Old Windsor can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- Arbo and Everbuild products
- White, clear, grey or another colour, product permitting
- Colour picked to suit the job
- We are fully insured
Take a look at what affects the cost or what customers say.