Kent · England
Window & door mastic in Sittingbourne, Kent
Mastic around window and door frames, sills and patio doors for homes and businesses in Sittingbourne and across Kent. Fully insured, ARBOMaster approved and guaranteed for a year.
- Whistling draughts around closed windows
- Hard, cracked sealant around windows
- Gaps left after new windows were fitted
Sittingbourne homes and the weather
Sittingbourne is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Sittingbourne station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you live in an older home near Church of the Holy Trinity, the joint between an old wall and a newer frame is generally the first place rain gets in.
Sittingbourne is about 37 miles east of London, in Kent. If you need window mastic in Sittingbourne, please phone 0345 464 0079 or drop us an email for a quick quote. We cover Kent from our Crawley base. Our area takes in 922 places across Kent. There’s also a page for Chelmsford, roughly 29 miles from Sittingbourne.
Here we cover the ME10 and ME9 postcode area for window mastic. Streets in the area include High Street, Roman Square and Moonstone Square, all of which we cover. Sittingbourne sits on or near the A2 and A249, so getting to you is simple. Nearby, we also carry out window mastic in Murston (1 mile east), Milton Regis (1 mile north-east), Kemsley (1 mile north), Howt Green (1 mile north-west) and Heart's Delight (1 mile south-west). Further out, we also cover Maidstone (10 miles south-west), Ashford (15 miles south), Whitstable (13 miles east), Faversham (7 miles east), Minster (6 miles north-east) and Kings Hill (15 miles west). As one of the bigger places in Kent, Sittingbourne has homes, rented property and businesses of every kind.
Around Sittingbourne
We work in homes and buildings around Milton Court Primary Academy, The Golden Hope pub and Milton Creek Country Park, among other places. Sittingbourne has its own railway station: Sittingbourne station. A little further out are Bayford Court (less than half a mile east) and Court Hall Museum (within half a mile north).
Window mastic in Sittingbourne, done properly
Whether it’s one leaking patio door or every frame on the house, the work is priced before anything is done. To get one, call 0345 464 0079 or send us an email with the number of frames and any access details for window mastic in Sittingbourne. If you have damp patches on the reveal after heavy rain and cracked sealant at the sill ends, we can help, whatever the surface.
Plenty of homes in a town like Sittingbourne have had conservatories, patio doors or new windows added over the years. Each one adds more joints to look after, and those joints age at different rates. Sills, frame heads and glazing joints are where leaks generally start.
All our work comes with our 12-month guarantee.
- Place
- Sittingbourne (ME10, ME9)
- Region
- Kent
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Sittingbourne
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
Signs it’s time to call us include:
- Leaking joints at the ends of sills
- Cracked internal joints between frame and plaster
- Cold air getting in at the frame edge
- Mastic that is falling out in pieces
If you look after a building such as Borden Grammar School, larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- What the cure time is
- Whether you can choose the colour
- How hidden problems are handled
- Whether VAT is included
How the job changes by surface
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We’ll point out any rot we find, as a joiner will need to deal with it.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
What we do, step by step
When we arrive, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before we start. The work usually takes anything from an hour or two to a full day, depending on how many frames there are. In Sittingbourne, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Mention any parking rules near the property
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
How to get a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Read more
What affects the quote in Sittingbourne
You’ll get a clear quote before we start. It takes into account:
- The type of sealant required
- Access and height
- Working hours on commercial sites
- The old material and how stubborn it is
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
You do not need to know the technical terms. Just tell us:
- Any access issues, like height or stairs
- The problem you’ve noticed
- Roughly how big the job is
- If someone has resealed it before
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or send us an email.
Also near Sittingbourne
Other services in Sittingbourne
Aftercare tips
So the new joints stay in good condition:
- Avoid harsh chemicals near the mastic
- Repaint timber before it’s bare
- Keep drainage slots and sill grooves clear
- Air rooms to keep condensation down around windows
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and a cold room gets colder. A new joint closes it up.
For landlords and businesses
If you manage several properties in or around Sittingbourne, several properties can be quoted together. Send us the addresses and the work at each, and pictures by email help.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Why it’s worth doing now in Sittingbourne
The work is quick compared with the damage it prevents: the visit takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. Gaps in sealant and mould in the bead never get better on their own, and in a busy household in Sittingbourne they spread with every shower and every downpour. Now is the easy time to put it right.
A failed joint rarely gets cheaper to fix by waiting. If you are unsure, phone 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Sittingbourne
- Over 20 years’ experience
- White, clear, grey or another colour, product permitting
- A 12-month guarantee on all work
- Quality sealants from Arbo and Everbuild
See what affects the cost and customer reviews.
Sittingbourne: your questions answered
Does living near the coast affect window mastic in Sittingbourne?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you cover Sittingbourne for window mastic?
Yes, Sittingbourne is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Are you ARBOMaster approved?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Can I paint over the new sealant?
Not if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or drop us an email.
Are you fully insured?
Yes. We’re fully insured.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.