Kent · England
New Street Window Mastic
Professional window mastic in and around New Street, with every bit of old sealant taken out first.
- Cracked internal joints between frame and plaster
- Cracked or shrunken mastic around the frame
- White mastic on grey or black frames
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Use gentle cleaners on frames and sealant
- Repaint timber before it’s bare
- Make sure the drainage slots aren’t blocked
- Check the mastic once a year
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
Window mastic for homes and businesses in New Street
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the line suits the frame instead of standing out. Typical jobs include gaps left after new windows were fitted and gaps between the frame and the inside reveal, across aluminium frames, uPVC windows and timber windows & doors.
Homes in small places like New Street often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
All our work comes with a 12-month guarantee.
- Location
- New Street (TN15)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
Draughts and leaks do not always mean new windows. If the frames and glass are in good order, resealing the joints is often all that is needed. If we find failed glass units or worn seals, we will tell you. Around New Street, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Doing several joints on one visit is usually more efficient than separate visits. We’ll send you a clear quote for the lot.
Why New Street customers choose us
- You choose the colour before work begins
- More than 20 years in sealant work
- Sanitary silicone with an anti-fungal additive in wet areas
- We never seal over old sealant
See what affects the cost and customer reviews.
How we quote for window mastic
The quote reflects the job in front of us. We take into account:
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- When we can work, for business premises
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
To make quoting easier, please include:
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- Whether it has been sealed before
Want a quote for window mastic? Please phone 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and send you a clear quote before any work starts.
What we are called out for in New Street
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar never bonded as it should, so it comes away long before its time.
Keep an eye out for any of the following:
- Hard, cracked sealant around windows
- Damp patches on the reveal after heavy rain
- Sealant in the wrong colour for the frame
- Black, perished sealant on frames
Letting a property close to Meopham station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Questions to ask before booking
- When the joint can take water or movement
- Whether you can choose the colour
- Whether they’re fully insured
- Is the old sealant removed completely?
Questions from New Street
Will you come out to New Street?
Yes. New Street is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Meopham station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.
Is there any odour?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few photos.
Should I try DIY first?
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.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Can new window sealant be painted?
Not usually, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Work for landlords, hotels and businesses
For anyone letting property in or around New Street, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Towns and villages near New Street
What else we do in New Street
Window mastic in New Street: local notes
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Cobham College (about 3.6 miles north-east) nearby, there’s older building stock in the area around New Street as well as newer homes. 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.
If you live in an older home near Church of Saint Peter, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as Culverstone Green Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
New Street is about 6 miles south of Northfleet, in Kent. Homes, rented property, offices and hotels in New Street can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 922 places across Kent, from the larger towns to small villages. You can also see our page for London, roughly 21 miles from New Street.
Postcode districts we cover here for window mastic: TN15. If you are just outside New Street, we cover Ridley (1 mile west), South Street (1 mile east), Hodsoll Street (1 mile south-west), Culverstone Green (1 mile south-east) and Priestwood Green (1 mile east). We also work in nearby towns such as Maidstone (10 miles south-east), Dartford (8 miles north-west), Sevenoaks (8 miles south-west), Royal Tunbridge Wells (15 miles south), Gravesend (6 miles north) and Tonbridge (11 miles south).
Near you in New Street
Around New Street, our work takes us to homes and buildings near Meopham School and Trosley Country Park, among other places. New Street’s nearest station is Meopham station, about 2.4 miles north. Well-known places in the area include Ightham Court (4.6 miles south-west) and Coldrum Long Barrow (2.7 miles south-east).
The process
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a morning for a couple of windows and a door. Somewhere like New Street 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.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Mention any tricky access
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or drop us an email.