Kent · England
Window & door mastic in Cold Harbour, Kent
We cover Cold Harbour for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Cold air getting in at the frame edge
- Black, perished sealant on frames
- Cracked or shrunken mastic around the frame
Window mastic in Cold Harbour, done properly
Around Cold Harbour we seal all kinds of frames: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Typical jobs include cracked internal joints between frame and plaster and rushed sealant from a window installation, on window sills, timber windows & doors and uPVC windows.
Around Cold Harbour, 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.
All our work comes with our 12-month guarantee.
- Where
- Cold Harbour (ME17)
- Region
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why act early in Cold Harbour
Choosing the product is half the job. Decorators’ caulk and bathroom silicone are not designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. Around Cold Harbour, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why choose Mr Mastic in Cold Harbour
- Anti-fungal sanitary silicone in wet areas
- Colour picked to suit the job
- Trusted Arbo and Everbuild sealants
- One-year guarantee on every job
Read our cost guide or customer reviews.
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Do not use solvent cleaners on the joint
- Ventilate rooms so frames don’t stay wet inside
- Clear any debris from frame drain holes
- Wash the frames with mild soapy water
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.
When it is not the sealant
A few problems are outside what sealant work can do:
- Broken hinges, locks or handles
- Soft or decayed wood in the frame
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before you book.
Surfaces we seal
- Timber windows & doors
- uPVC windows
- Window sills
- Aluminium frames
- Patio & French doors
- Composite doors
Also near Cold Harbour
More services for Cold Harbour
FAQs for Cold Harbour
I let a flat near Charing station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Can you do window mastic in Cold Harbour?
Yes, Cold Harbour is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all.
Can you match the sealant to my frames?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
Does the work come with a guarantee?
Yes. Our one-year guarantee covers every job.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
How do I get a quote for window mastic in Cold Harbour?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
How it works
The work is kept neat and contained to the area we are working on, so you can get on with your day. The job generally takes a morning for a couple of windows and a door, and we explain the cure time before we leave. Somewhere as small as Cold Harbour, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Clear items away from the joints we are working on
- For business premises, tell us about site rules or sign-in
- Try not to wet indoor joints just before the visit
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and give you a clear price.
Related advice
Do you need window mastic in Cold Harbour?
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Keep an eye out for any of the following:
- Rain getting in at the frame or under the sill
- Old mastic that has gone black or come away
- Cold air getting in at the frame edge
- Hard, cracked sealant around windows
For landlords with property near Charing station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Comparing quotes
- How hidden problems are handled
- The length of the guarantee
- Which colour the sealant will be
- Whether all the old sealant comes out first
How we quote for window mastic
For a quick quote, just ask. The main things that affect it are:
- Access and height
- How many areas need sealing
- The amount of work
- Whether old sealant or filler has to be cut out
What it costs depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Asking for a quote
When you contact us, these details help:
- Whether it has been sealed before
- A few photos by email, if you can
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll come back to you with a quote.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
What window mastic looks like in Cold Harbour
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. Historic houses like Belmont House and Gardens (about 3.8 miles north-east) are a reminder that the area around Cold Harbour has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Church of St Lawrence, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Cold Harbour is about 7 miles south-west of Faversham, in Kent. From the centre of Cold Harbour to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 922 places across Kent, large and small. Chelmsford is on our list too, around 37 miles away.
Here we cover the ME17 postcode area for window mastic. If you’re just outside Cold Harbour, we cover Warren Street (1 mile north-west), Payden Street (1 mile north-west), Lenham Heath (2 miles south-west), Charing Heath (2 miles south) and Lenham Forstal (2 miles south-west). Larger places within reach include Maidstone (11 miles west), Ashford (8 miles south-east), Canterbury (14 miles east), Sittingbourne (7 miles north), Whitstable (14 miles north-east) and Faversham (7 miles north-east).
What’s near Cold Harbour
We work in homes and buildings around The Harrow pub and Spuckles and Kennelling Woods. The nearest railway station is Charing station, about 2.3 miles south. A little further out are Newnham Castle (3.4 miles north).