Kent · England
Northfleet Green Window Mastic
We cover Northfleet Green for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Hard, cracked sealant around windows
- White mastic on grey or black frames
- Cracked sealant at the sill ends
How we handle window mastic in Northfleet Green
The new joint does not have to be white. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. If you’re dealing with mastic that has split away from the wall and cracked sealant at the sill ends, we can help, on aluminium frames, uPVC windows and timber windows & doors alike.
In a village or hamlet like Northfleet Green, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Northfleet Green (DA13, DA11)
- Wider area
- Kent
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
So the new joints stay in good condition:
- Walk round the house once a year and look at the joints
- Keep timber frames painted
- Avoid blasting the frames with a pressure washer
- Air rooms to keep condensation down around windows
Silicone cannot generally be painted, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a morning for a couple of windows and a door. In a small place like Northfleet Green, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- We fit backing rod in deep gaps so the sealant is the right depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Mention any tricky access
- Where the joints are inside, avoid wetting them before we arrive
- For business premises, tell us about site rules or sign-in
How to get a quote
If you are in Northfleet Green and need window mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Advice
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
What window mastic looks like in Northfleet Green
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Cobham College (about 3.2 miles south-east) are a reminder that the area around Northfleet 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.
For landlords with property near Ebbsfleet International station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as Painters Ash Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Northfleet Green is about 1 mile south of Northfleet, in Kent. Across the DA13 area, our applicators can take on window mastic. Northfleet Green is one of 922 towns and villages in Kent where we work for window mastic. London is on our list too, around 19 miles away.
Work in DA13 and DA11 works the same way as everywhere else we cover. Whether your property is on Downs Road and New Barn Road or anywhere close by, we can help. Other places close to Northfleet Green include Southfleet (1 mile west), Painters Ash (1 mile north), Istead Rise (1 mile south-east), Hook Green (1 mile west) and Springhead (1 mile north). Larger places within reach include Maidstone (13 miles south-east), Dartford (5 miles west), Sevenoaks (11 miles south-west), Tonbridge (15 miles south), Swanley (7 miles west) and Kings Hill (10 miles south).
Around Northfleet Green
Locally, jobs take us to homes and businesses close to Black Lion pub, Northfleet School for Girls and Saint George's Church of England School, among other places. For rail, the closest station is Ebbsfleet International station, roughly 2 miles north. Other landmarks nearby include Gravesham Museum (2.3 miles north-east) and Bluewater (3.3 miles north-west). Not far away are Sawyers Lake.
When something else is needed
To be straight with you, there are a few things sealant will not fix:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Rotten timber, which needs a joiner first
- Broken hinges, locks or handles
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- uPVC windows
- Window sills
- Patio & French doors
- Aluminium frames
- Composite doors
- Timber windows & doors
Common problems we fix in Northfleet Green
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
These are the problems we’re asked about most:
- Damp patches on the reveal after heavy rain
- A bead that does not match the frame
- Draughts coming in around windows and doors
- Gaps left after new windows were fitted
For an older house near a landmark such as Church of St Nicholas, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- Is VAT in the price?
- How hidden problems are handled
- Are they insured?
- Is the old sealant removed completely?
FAQs for Northfleet Green
Do you cover smaller places like Northfleet Green?
Yes. Northfleet Green is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Ebbsfleet International station?
Yes. We work for landlords and agents as well as householders. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Can you do the inside joint as well?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
Can you match the sealant to my frames?
Normally, yes. Mention the frame colour when you ask for a quote and we will match it as closely as we can.
Do you guarantee window mastic?
Yes, for 12 months. Keeping drainage clear and checking the joints yearly helps them last.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
What should I tell you?
A short description and the location, plus photos if you have them. We’ll ask anything else we need to know.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Leave it or put it right?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. In a small place like Northfleet Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
What you get with us
- Neat joints and a tidy finish
- Full insurance on every job
- One-year guarantee on every job
- You choose the colour before work begins
See our cost guide or customer reviews.
What affects the quote in Northfleet Green
Jobs vary more than people expect. The main factors:
- How much old sealant there is and how hard it is to remove
- The amount of work
- Whether the work is at height
- How many areas need sealing
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
What to tell us for a quote
You do not need to know the technical terms. It helps if you can tell us:
- Pictures of the joints, sent by email
- Roughly how big the job is
- Whether it’s a home or a business
- What’s wrong with the joints now
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll take it from there.