Kent · England
Window Mastic in Greatstone-on-Sea
Specialist window mastic for Greatstone-on-Sea: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Gaps where the sill meets the wall
- Damp patches on the reveal after heavy rain
- A bead that doesn’t match the frame
Window mastic for homes and businesses in Greatstone-on-Sea
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that can’t move properly, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. We work on composite doors, window sills and uPVC windows, and people most often call us about water coming in at the bottom corners of a door and whistling draughts around closed windows.
Mastic can only go onto a dry, clean joint, so window work in Greatstone-on-Sea is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Big or small, it’s backed by our 12-month guarantee in Greatstone-on-Sea and across Kent.
- Where
- Greatstone-on-Sea (TN28)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for window mastic
You will get a clear quote before any work starts. It’s based on:
- Any working-time requirements on site
- Mould in or behind the old joints
- How easy the joints are to reach
- The number of rooms or windows
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
You don’t need to know the technical terms. Just tell us:
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
- Where the property is
- The type of property
Getting a quote is simple: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Why it’s worth doing now in Greatstone-on-Sea
Running fresh sealant over the old joint is tempting, but new sealant cannot bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. Where a wall is exposed, as many are in small places like Greatstone-on-Sea, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or email us and we will give you an honest view and a quote.
Why choose Mr Mastic in Greatstone-on-Sea
- We never seal over old sealant
- Fully insured
- An ARBOMaster approved applicator
- 4.9 on Google from 180+ five-star reviews
Take a look at what affects the cost or our reviews.
Places near Greatstone-on-Sea
Also in Greatstone-on-Sea
Honest limits
New sealant cannot fix everything, and we’d rather say so up front. Sealant won’t put right:
- Draughts through the window seals rather than the frame
- Damp coming through the wall itself rather than the frame joint
- Faulty window hardware
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Aluminium frames
- Composite doors
- Window sills
- uPVC windows
- Timber windows & doors
- Patio & French doors
For landlords and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Greatstone-on-Sea: your questions answered
Can you do window mastic in Greatstone-on-Sea?
Yes, Greatstone-on-Sea is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you cover smaller places like Greatstone-on-Sea?
Yes. Greatstone-on-Sea is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Can you seal the gap between the frame and the plaster indoors?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We do one or both.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
What does window mastic cost?
It depends on the job, so we quote each one individually. To get one, phone 0345 464 0079 or drop us an email and tell us what needs doing and where.
How the visit works
We work through the job in order: protect, prepare, seal, tidy. Typically it takes most of a day for a typical house, less for a few frames and we leave things clean and tidy. Somewhere as small as Greatstone-on-Sea, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing, 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.
Preparing for the visit
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you’re ready, call 0345 464 0079 or drop us an email.
Read more
Greatstone-on-Sea homes and the weather
Greatstone-on-Sea 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as Greatstone Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Greatstone-on-Sea is about 9 miles south-west of Hythe, in Kent. We carry out window mastic for householders, landlords and businesses in Greatstone-on-Sea and nearby, as part of our work across Kent. Greatstone-on-Sea is one of 922 towns and villages in Kent where we work for window mastic. Our Brighton page covers work nearby (49 miles or so).
Postcode districts we cover here for window mastic: TN28. That includes homes and businesses on Alfred Road, Meehan Road South and Hardy Road and the roads around them. We also cover the places around Greatstone-on-Sea: Littlestone-on-Sea (1 mile north), New Romney (1 mile north-west), Lydd-on-Sea (2 miles south), Lydd (3 miles south-west) and St Mary's Bay (3 miles north). Larger places within reach include Ashford (12 miles north), Folkestone (12 miles north-east), Hythe (9 miles north-east), Hawkinge (13 miles north-east), Tenterden (14 miles north-west) and Cheriton (11 miles north-east).
Around Greatstone-on-Sea
We work in homes and buildings around Romney Warren Country Park, The Marsh Academy and The Jolly Fisherman pub. Other landmarks nearby include Romney 'castle' (3.2 miles north-west) and Lydd Town Museum (2.8 miles south-west). Open spaces near Greatstone-on-Sea include Dungeness National and Burnthouse Pen.
What we’re called out for in Greatstone-on-Sea
Older frames were often sealed with products that set hard. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
Look out for any of the following:
- Old mastic that has gone black or come away
- Cold air getting in at the frame edge
- Damp patches on the reveal after heavy rain
- Cracked internal joints between frame and plaster
Homes close to St Peter's include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before booking anyone
- What the cure time is
- Whether all the old sealant comes out first
- Whether the sealant suits the joint
- How long the guarantee is
How the job changes by surface
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.