Kent · England
Window & door mastic in Folkestone, Kent
Mastic around window and door frames, sills and patio doors for Folkestone, backed by a one-year guarantee. Call for a quick quote.
- Rain getting in at the frame or under the sill
- Gaps left after new windows were fitted
- Hard, cracked sealant around windows
About our window mastic in Folkestone
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We are often asked to deal with whistling draughts around closed windows and gaps where the sill meets the wall, across uPVC windows, composite doors and patio & French doors.
Walls in Folkestone that face the prevailing wind take the most weather, and that is normally where the sealant gives up first. It’s worth looking at every frame, not just the one that leaks.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Where
- Folkestone (CT20, CT19, CT21)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Folkestone homes and the weather
Folkestone is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around window and door frames, especially on the side facing the sea. 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.
In the older streets around United Reformed Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Folkestone Central station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Folkestone is in Kent. Across the CT20 area, our applicators can take on window mastic. Our area takes in 922 places across Kent. There’s also a page for Chelmsford, about 54 miles away.
We cover every part of CT20, CT19 and CT21 for window mastic and the streets around it. Whether your property is on Christ Church Road, Middelburg Square and Station Road or anywhere close by, we can help. Folkestone sits on or near the A259 and A260. Nearby, we also carry out window mastic in Cheriton (1 mile west), Sandgate (1 mile south-west), Hawkinge (2 miles north), Arpinge (2 miles north-west) and Seabrook (2 miles west). Within a short drive, we also cover Ashford (14 miles west), Canterbury (14 miles north), Dover (7 miles north-east), Deal (13 miles north-east), Hythe (4 miles west) and Tower Hamlets (7 miles north-east). As one of the bigger places in Kent, Folkestone has every kind of property, from flats to offices.
What’s near Folkestone
In Folkestone, that means homes and buildings near The Park Inn Hotel, Lower Leas Coastal Park and The Harvey Grammar School, among other places. Folkestone has its own railway station: Folkestone Central station. Nearby you will also find Folkestone Museum (0.7 miles south-east) and Folkestone Castle (1 mile north). Green spaces nearby include Sugar Loaf Hill.
Why act early in Folkestone
A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. Resealing now is a small job by comparison. In a family home in Folkestone, a failed seal around a bath or a frame lets water into places you cannot see, like the floor under a bath, the back of a panel or the inside of a wall. Left alone, that means rot, damp and a bigger repair.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Why us?
- White, clear, grey or another colour, product permitting
- Full insurance on every job
- Over 20 years’ experience
- Domestic, commercial and hotel work
Take a look at our cost guide or our reviews.
When it is not the sealant
Before booking, it’s worth knowing the limits:
- Draughts through the window seals rather than the frame
- Damp problems in the wall away from the window
- Soft or decayed wood in the frame
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Patio & French doors
- uPVC windows
- Aluminium frames
- Composite doors
- Timber windows & doors
- Window sills
Signs you need window mastic in Folkestone
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, and it lets go sooner than it should.
Keep an eye out for any of the following:
- Black, perished sealant on frames
- Gaps between the frame and the inside reveal
- Hard, cracked sealant around windows
- Untidy mastic left by window fitters
If you look after a building such as Stella Maris Catholic Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- Whether all the old sealant comes out first
- What insurance they hold
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
What happens on the day
We keep the work tidy and contained to the joints we’re treating. The job generally takes a few hours for a few frames, or a day or more for a whole house. For a job in Folkestone, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Move anything stored near the joints
- Try not to wet indoor joints just before the visit
How to get a quote
Every job is quoted individually. Simply ring 0345 464 0079 or drop us an email and describe the job.
Advice
Folkestone questions
Do you work for landlords with property near Folkestone Central station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Is window mastic in a coastal place like Folkestone any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you come to Folkestone?
Yes. We cover Folkestone, as part of our work across South East England, London and Scotland. For a quote, call 0345 464 0079 or email us.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you have sealant for grey or black windows?
Usually, yes. Mention the frame colour when you ask for a quote and we’ll use the nearest match.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
How much does window mastic cost in Folkestone?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we’ll talk you through it.
Landlords, agents and businesses in Folkestone
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Other services in Folkestone
Different surfaces, different methods
Aluminium frames
Aluminium moves with heat, and the frames are often slimmer than uPVC. A tidy bead in anthracite grey, black or a matching colour suits the frame.
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We look for the cause first.