Kent · England
Window & door mastic in River, Kent
Problem with your window and door frames in River? We cut out the old, prepare the joints and apply the right sealant.
- Cold air getting in at the frame edge
- Damp patches on the reveal after heavy rain
- Cracked sealant at the sill ends
Signs you need window mastic in River
Sun, frost and rain wear sealant out. Sunlight dries the surface out, until it loses its stretch and starts to crack.
Signs it’s time to call us include:
- Mastic that is falling out in pieces
- Cracked internal joints between frame and plaster
- Mastic that has split away from the wall
- White mastic on grey or black frames
Schools such as River Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- What preparation is included
- What the cure time is
- What happens if they find a problem under the old sealant
- What insurance they hold
Window mastic in River, done properly
Over two decades of sealing frames has taught us which products suit which walls. We are ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. Common call-outs are for cracked sealant at the sill ends and cracked or shrunken mastic around the frame, across uPVC windows, composite doors and timber windows & doors.
Many houses in smaller places like River have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
You get a one-year guarantee, the same in River as everywhere else we work.
- Place
- River (CT17, CT16)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Keep solvents and bleach off the sealant
- Keep drainage slots and sill grooves clear
- Don’t paint over the silicone
- Keep timber frames painted
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just ring 0345 464 0079 or email us.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
What else we do in River
Honest limits
Before booking, it’s worth knowing the limits:
- A door that needs adjusting, rehanging or new seals
- Soft or decayed wood in the frame
- Damp problems in the wall away from the window
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Surfaces we seal
- Patio & French doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
- Timber windows & doors
How we quote for window mastic
Your quote is based on your job. We look at:
- The old material and how stubborn it is
- Any working-time requirements on site
- Whether the work is at height
- The product the joint needs
Combining jobs into one visit is generally more efficient than separate visits. You’ll get one clear quote for the whole job.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- The type of property
- Roughly how big the job is
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
We quote each job on its own. Just call 0345 464 0079 or email us with the details, and pictures are welcome.
Questions from River
Is River within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Kearsney station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you remove the old sealant?
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 River?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
How many windows can you do in a day?
It depends on access, the old mastic and the size of the frames. We’ll tell you how long your job needs when we quote.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint.
Different surfaces, different methods
Patio & French doors
Door frames take knocks and movement every time the doors are used. A flexible sealant copes with that, where a rigid one would crack.
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. Most jobs take most of a day for a typical house, less for a few frames. Parking around River 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 check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
- Plan for the work area to be out of bounds to pets and children
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Advice
Frames and glazing around River
River is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Kearsney station? Then renewing tired window mastic between tenants heads off draught and damp complaints. If you live in an older home near Church of St Peter, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
River is about 1 mile north-west of Dover, in Kent. Anywhere in CT17, our applicators can take on window mastic. Our area takes in 922 places across Kent, large and small. You can also see our page for Chelmsford, roughly 53 miles from River.
Every address in CT17 and CT16 is covered for window mastic, from the main roads to the quietest streets. You’ll find streets such as Lower Road, Minnis Lane and London Road, all of which we cover. Neighbouring places we cover for window mastic include Kearsney (1 mile north-west), Temple Ewell (1 mile north-west), Dover (1 mile south-east), Whitfield (1 mile north-east) and Maxton (2 miles south). Within a short drive, we also cover Canterbury (13 miles north-west), Folkestone (6 miles south-west), Ramsgate (15 miles north-east), Deal (7 miles north-east), Hythe (10 miles south-west) and Walmer (7 miles north-east).
Local landmarks in River
In River, that means homes and buildings near St Edmund's Catholic School, Old Park Hill and Royal Oak Cottage The Royal Oak Public House. For rail, the closest station is Kearsney station, about 0.5 miles north-west. Well-known places in the area include Crabble Corn Mill (under half a mile south-east) and Dover Castle (2.2 miles south-east). Open spaces near River include Dover Western Heights.