Kent · England
Window & door mastic in Wilmington, Kent
We cover Wilmington for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Cold air getting in at the frame edge
- Gaps where the sill meets the wall
- Cracked internal joints between frame and plaster
About our window mastic in Wilmington
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that can’t flex, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. We work on patio & French doors, uPVC windows and aluminium frames, and common reasons people get in touch are hard, cracked sealant around windows and cold air getting in at the frame edge.
Around Wilmington, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Big or small, it’s backed by our 12-month guarantee in Wilmington and across Kent.
- Location
- Wilmington (DA2, DA5, DA1)
- Wider area
- Kent
- Cover
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Common questions in Wilmington
Do you cover Wilmington for window mastic?
Yes, Wilmington is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Can you help a landlord with a rental near Crayford station?
Yes. We work for landlords and letting agents as well as householders. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you do the inside joint as well?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll explain our choice.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Do you need window mastic in Wilmington?
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar didn’t grip properly, and it lets go sooner than it should.
Signs it’s time to call us include:
- Black, perished sealant on frames
- Whistling draughts around closed windows
- Rain getting in at the frame or under the sill
- Untidy mastic left by window fitters
Letting a property close to Crayford station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Comparing quotes
- What product goes in the joint
- How long the guarantee is
- Who does the work, and how experienced they are
- Whether all the old sealant comes out first
How it works
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours for a few frames, or a day or more for a whole house from start to finish. Somewhere like Wilmington needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we are working on
- On commercial sites, let us know about site rules
Getting a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
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What affects the quote in Wilmington
Every job gets its own quote. These are the things that affect it:
- Whether there’s mould to deal with
- The type of sealant required
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
Combining jobs into one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Helping us quote
To help us quote quickly, please include:
- The address or postcode of the job
- A few photos by email, if you can
- How many joints, rooms or windows are involved
- The type of property
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Frames and glazing around Wilmington
With historic houses such as Hall Place and Gardens (about 1.7 miles north-west) nearby, there’s older building stock in the area around Wilmington as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
If you look after a building such as Wilmington Grammar School for Girls, the mastic around its windows and doors needs looking after like any other building’s. Homes close to St Barnabas include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Wilmington is about 2 miles south-west of Dartford, in Kent. For window mastic in and around Wilmington, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We’re based in Crawley and cover Kent, Wilmington included. Our Kent coverage runs to 922 places, and Wilmington is one of them. We also work in London, about 13 miles from Wilmington.
Work in DA2, DA5 and DA1 is quoted and booked the same way as anywhere else. Streets in the area include Common Lane, Parsons Lane and Oakfield Lane, and we cover them all. Wilmington is on the A2, which makes it straightforward to reach with everything needed for window mastic. We also cover the places around Wilmington: Bowmans (1 mile north), Joyden's Wood (1 mile west), Puddledock (1 mile south-west), Coldblow (1 mile north-west) and Crayford (1 mile north). Larger places within reach include Sevenoaks (10 miles south), Gravesend (8 miles east), Northfleet (7 miles east), Kings Hill (14 miles south-east), Swanscombe (5 miles east) and Windmill Hill (8 miles east).
Landmarks near Wilmington
We work in homes and buildings around Dartford Heath, The Plough pub and Wilmington Primary School, among other places. For rail, the closest station is Crayford station, roughly 1.3 miles north of the centre. A little further out are Stone Castle (4 miles east) and West Hill Hospital (1.4 miles north-east). For a walk, there’s Wansunt Pit.
What the job involves on each surface
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. We seal those with a sealant suited to masonry.
Nearby places to Wilmington
More services for Wilmington
Honest limits
Before booking, it’s worth knowing the limits too:
- Worn gaskets, brush seals or a door that has dropped
- A frame that has rotted at the joint
- Condensation trapped between the panes
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Surfaces we seal
- Window sills
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- Composite doors
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Check the mastic once a year
- Use gentle cleaners on frames and sealant
- Paint up to the joint, not over it
- Wipe condensation off the frames
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. A new joint closes it up.