Kent · England
Window & door mastic in New Ash Green, Kent
Window and door frames in New Ash Green need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Hard, cracked sealant around windows
- Gaps left after new windows were fitted
- Cracked internal joints between frame and plaster
Window mastic in New Ash Green
Most frames have an outside joint and an inside one. The external joint is the weather seal; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. We work on aluminium frames, patio & French doors and uPVC windows, and common reasons people get in touch are draughty joints inside around the window and rain getting in at the frame or under the sill.
Mastic can only go onto a dry, clean joint, so window work in New Ash Green is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
There’s a 12-month guarantee on every job.
- Location
- New Ash Green (DA3, TN15)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in New Ash Green
Can you help a landlord with a rental near Longfield station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Do you cover smaller places like New Ash Green?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How do I get a quote for window mastic in New Ash Green?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before work begins.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Do you seal inside as well as outside?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly.
Can new window sealant be painted?
Silicone generally will not take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Can you do upstairs windows?
Generally, yes. We plan safe access before the job.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or drop us an email.
Towns and villages near New Ash Green
What else we do in New Ash Green
How the visit works
Before we leave, we go over the finished joints with you. The visit itself usually takes anything from an hour or two to a full day, depending on how many frames there are, depending on the size of the job. Somewhere like New Ash Green 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.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Mention any sign-in or site rules at work premises
- Tell us about any water getting in
- Mention any tricky access
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 photos by email if you can.
Advice
Leave it or put it right?
Resealing frames is a short job: it takes a few hours for a few frames, or a day or more for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. Around New Ash Green, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why book with us
- One-year guarantee on every job
- White, clear, grey or coloured to suit, where the product allows
- Neat joints and a tidy finish
- Arbo and Everbuild products
Read our cost guide and customer reviews.
Surface by surface
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
What sealant work cannot fix
To be straight with you, there are a few things sealant will not fix:
- Damp coming through the wall itself rather than the frame joint
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Broken hinges, locks or handles
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in New Ash Green
- Aluminium frames
- uPVC windows
- Timber windows & doors
- Composite doors
- Window sills
- Patio & French doors
What affects the cost of window mastic
Call for a quick quote. The main things that affect it are:
- Any mould that needs treating
- The size of the job
- Any working-time requirements on site
- Whether the work is at height
Doing several joints on one visit is generally more efficient than separate visits. We will send you a clear quote for the lot.
Asking for a quote
When you contact us, these details help:
- Whether it’s a home or a business
- If someone has resealed it before
- Access, such as stairs, a lift or height
- Roughly how big the job is
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Do you need window mastic in New Ash Green?
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
The problems people usually mention when they call include:
- Cold air getting in at the frame edge
- Hard, cracked sealant around windows
- Old mastic that has gone black or come away
- Sealant in the wrong colour for the frame
In the older streets around Parish Church of Saint Peter and Saint Paul, the joint between an old wall and a newer frame is generally the first place rain gets in.
What your quote should include
- How long the guarantee is
- How much experience the applicator has
- How the surfaces are prepared before sealing
- Whether you can choose the colour
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
New Ash Green homes and the weather
Historic houses like Cobham College (about 4.3 miles east) are a reminder that the area around New Ash Green 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. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Longfield station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Managing a site like New Ash Green Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
New Ash Green is about 5 miles south of Northfleet, in Kent. For window mastic in and around New Ash Green, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We’re based in Crawley and cover Kent. Across Kent, we cover 922 places, New Ash Green among them. There’s also a page for London, roughly 20 miles from New Ash Green.
Here we cover the DA3 and TN15 postcode area for window mastic. Whether your property is on Church Road, Upper Street North and Upper Street South or a nearby road, our applicators can take on the job. Neighbouring places we cover for window mastic include Ridley (1 mile south-east), Hartley (1 mile north), New Street (2 miles south-east), Hodsoll Street (2 miles south-east) and Longfield Hill (2 miles north-east). We also work in nearby towns such as Maidstone (12 miles south-east), Dartford (6 miles north-west), Sevenoaks (8 miles south-west), Gravesend (5 miles north-east), Tonbridge (12 miles south) and Northfleet (5 miles north).
Local landmarks in New Ash Green
In New Ash Green, that means homes and buildings near The White Swan Public House, Longfield Academy and Rectory Meadow. The closest station to New Ash Green is Longfield station, roughly 2.1 miles north. A little further out are Eynsford Castle (4 miles west) and Darent Valley Hospital (5.2 miles north-west).