Kent · England
Window Mastic in Northdown
Window mastic for Northdown, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rushed sealant from a window installation
- Gaps where the sill meets the wall
- Mastic that’s falling out in pieces
Window mastic in Northdown
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. We work on window sills, timber windows & doors and patio & French doors, and people most often call us about draughty joints inside around the window and cracked sealant at the sill ends.
Around Northdown, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Place
- Northdown (CT9, CT10)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why it’s worth doing now in Northdown
Draughts and leaks do not always mean new windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we’ll say so. Around Northdown, water from a failed joint in an older home can soak into timber and plaster, and that’s a much bigger job than renewing the sealant.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- Every job guaranteed for a year
- Anti-fungal silicone where joints get wet
- Colour agreed with you before we start
Read what affects the cost and our reviews.
What affects the cost of window mastic
The quote reflects the job in front of us. We look at:
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- Any mould that needs treating
- Access and height
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll explain what it covers.
Helping us quote
What to tell us when you ask for a quote:
- Pictures of the joints, sent by email
- Roughly how big the job is
- What’s wrong with the joints now
- The address or postcode of the job
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Avoid blasting the frames with a pressure washer
- Check the mastic once a year
- Use gentle cleaners on frames and sealant
- Ventilate rooms so frames do not stay wet inside
Keep the new mastic undisturbed while it cures, following the cure time we give you. Do not point a pressure washer at the joints.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Also near Northdown
Other services in Northdown
Questions from Northdown
Does the coastal weather in Northdown affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Can you help a landlord with a rental near Broadstairs station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
How much does window mastic cost in Northdown?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
Does the work come with a guarantee?
Yes, with our one-year guarantee. Keeping drainage clear and checking the joints yearly helps them last.
Can new window sealant be painted?
That depends on the product. Silicone isn’t paintable, but some hybrid sealants are. Tell us if you’re decorating and we will choose accordingly.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Are you fully insured?
Yes. We are fully insured for domestic and commercial work.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
What we’re called out for in Northdown
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar never bonded as it should, so it comes away long before its time.
Any of these means the joints need attention:
- Draughty joints inside around the window
- Cold air getting in at the frame edge
- Cracked or shrunken mastic around the frame
- Mastic that’s falling out in pieces
If you live in an older home near St Philip, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before you book
- Whether the sealant suits the joint
- What preparation is included
- Is the old sealant removed completely?
- What the quote includes, VAT included or not
When something else is needed
We won’t take on work that will not last, so here’s what sealant cannot put right:
- A door that needs adjusting, rehanging or new seals
- Soft or decayed wood in the frame
- A failed sealed unit that has misted up
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Aluminium frames
- Window sills
- Composite doors
- Patio & French doors
- uPVC windows
- Timber windows & doors
How it works
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a morning for a couple of windows and a door. Parking around Northdown is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Before we arrive
- Let us know about parking restrictions
- Tell us about any water getting in
- Mention if the joints have been sealed before
Ask for a quote
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or send us an email and describe the job.
Related advice
Northdown homes and the weather
Northdown is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around window and door frames, especially on the side facing the sea. With historic houses such as Quex Park (about 4.5 miles west) nearby, there’s older building stock in the area around Northdown 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.
Letting a property close to Broadstairs station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. For site and facilities teams at buildings such as Palm Bay Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Northdown is about 2 miles east of Margate, in Kent. Every kind of property in Northdown is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 922 places across Kent. We also work in Chelmsford, around 47 miles away.
Every address in CT9 and CT10 is within our area for window mastic. That includes homes and businesses on Old Road, Holly Lane and Green Lane. Neighbouring places we cover for window mastic include Palm Bay (1 mile north-west), Cliftonville (1 mile west), Kingsgate (1 mile east), St Peter's (1 mile south) and Broadstairs (2 miles south). Further out, we also cover Ramsgate (3 miles south), Deal (12 miles south), Herne Bay (12 miles west), Walmer (13 miles south), St Lawrence (3 miles south) and Newington (3 miles south-west).
Near you in Northdown
Locally, jobs take us to homes and businesses close to Captain Digby Inn and Dane Court Grammar School. The nearest railway station is Broadstairs station, roughly 1.8 miles south. Other landmarks nearby include Westwood Cross (2.1 miles south-west) and Queen Elizabeth the Queen Mother Hospital (1.4 miles south-west).