Windsor and Maidenhead · England
Window & door mastic in Cold Harbour, Windsor and Maidenhead
Window and door frames in Cold Harbour need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Draughty joints inside around the window
- Cold air getting in at the frame edge
- Rain getting in at the frame or under the sill
When something else is needed
A few problems are outside what sealant work can do:
- Worn gaskets, brush seals or a door that has dropped
- A sash or casement that will not close properly
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Joints and surfaces we work on
- Window sills
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- Composite doors
- uPVC windows
Window mastic for homes and businesses in Cold Harbour
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on aluminium frames, timber windows & doors and patio & French doors, and the jobs we see most are draughts coming in around windows and doors and rain getting in at the frame or under the sill.
Mastic can only go onto a dry, clean joint, so window work in Cold Harbour is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
We stand behind the work with a one-year guarantee.
- Where
- Cold Harbour (SL6)
- Wider area
- Windsor and Maidenhead
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why act early in Cold Harbour
Getting a straight, even bead on an outside frame takes practice, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. Around Cold Harbour, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Cold Harbour
- Colour picked to suit the job
- An ARBOMaster approved applicator
- 180+ five-star Google reviews
- Homes, businesses and hotels
Take a look at what affects the cost or what customers say.
Common questions in Cold Harbour
Can you do window mastic in Cold Harbour?
Yes. We work across London and the South East, and Cold Harbour is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Is Cold Harbour within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures.
Will the old sealant be removed?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
How the visit works
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes most of a day for a typical house, less for a few frames. Somewhere like Cold Harbour needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
Get a quote
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or send us an email with the details, and photos are welcome.
Related advice
How the job changes by surface
Aluminium frames
Aluminium moves with heat, and the frames are often slimmer than uPVC. A neat, narrow bead in a colour to match keeps the clean look.
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Landlords, agents and businesses in Cold Harbour
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
We also work for property managers and facilities teams in Cold Harbour and across Windsor and Maidenhead. Several sites can be quoted together, and we’re fully insured.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Also near Cold Harbour
More services for Cold Harbour
What affects the cost of window mastic
Your quote is based on your job. We look at:
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
- Whether there’s mould to deal with
- Working hours on commercial sites
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Helping us quote
You don’t need to know the technical terms. It helps if you can tell us:
- Roughly how big the job is
- How we’d reach the joints
- Any previous sealing or DIY work
- Where the job is, and your postcode
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, ring 0345 464 0079 or drop us an email.
Windows and doors in Cold Harbour
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Harleyford Manor (about 3.3 miles north) are a reminder that the area around Cold Harbour has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
In the older streets around Saint Peter, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as Knowl Hill Church of England Primary Academy are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Wargrave station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Cold Harbour is about 3 miles west of Maidenhead, in Windsor and Maidenhead. Jobs in Cold Harbour get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Windsor and Maidenhead coverage runs to 57 places, and Cold Harbour is one of them. We also work in Reading, about 9 miles from Cold Harbour.
Here we cover the SL6 postcode area for window mastic. We also cover the places around Cold Harbour: Knowl Hill (1 mile north-west), Warren Row (1 mile north-west), Bowsey Hill (2 miles west), Cockpole Green (3 miles north-west) and Wargrave (3 miles west). We also work in nearby towns such as Maidenhead (3 miles east), Windsor (8 miles east), Boyn Hill (3 miles east), North Ascot (8 miles south-east), Cookham (5 miles north-east) and Furze Platt (3 miles north-east).
Around Cold Harbour
In Cold Harbour, that means homes and buildings near Cox Green School and The Royal Oak pub, among other places. The nearest railway station is Wargrave station, roughly 3.3 miles west of the centre. Other landmarks nearby include St Mark's Hospital (2.8 miles north-east). The countryside around Cold Harbour includes Hurley Chalk Pit and Taplow Lake.