Kent · England
Window Mastic in Greatness
Window and door frames in Greatness need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Water coming in at the bottom corners of a door
- Leaking joints at the ends of sills
- Whistling draughts around closed windows
Different surfaces, different methods
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We’ll tell you if that is what we find.
Window mastic for homes and businesses in Greatness
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. If you’re dealing with cracked internal joints between frame and plaster and cracked or shrunken mastic around the frame, we can help.
In a smaller place like Greatness, some walls face open ground and catch the full force of the weather. That is hard on the mastic around frames and sills.
Whatever the size of the job, it’s backed by our one-year guarantee in Greatness and across Kent.
- Place
- Greatness (TN13, TN14, TN15)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Quotes for window mastic in Greatness
For a quick quote, just ask. The main things that affect it are:
- Any mould that needs treating
- Working hours on commercial sites
- How many rooms, windows or areas are involved
- How easy the joints are to reach
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
Helping us quote
There’s no need for technical detail. Just tell us:
- The address or postcode of the job
- The problem you’ve noticed
- The type of property
- Pictures of the joints, sent by email
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
What we do, step by step
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a handful of frames, longer for a whole house from start to finish. Parking around Greatness is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Finally we tidy up and check each joint.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Tell us about any water getting in
- Clear items away from the joints we’re working on
Getting a quote
There’s no standard price list. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.
Advice
When it is not the sealant
We’ll always be straight with you, so here’s what sealant can’t fix:
- A sash or casement that won’t close properly
- Draughts through the window seals rather than the frame
- Condensation trapped between the panes
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Surfaces we seal
- Window sills
- uPVC windows
- Composite doors
- Aluminium frames
- Timber windows & doors
- Patio & French doors
Places near Greatness
Other services in Greatness
Greatness: your questions answered
Do you work for landlords with property near Bat & Ball station?
Yes, we work for landlords and agents. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Can you do window mastic in Greatness?
Yes, Greatness is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear price.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
How do I get a quote for window mastic in Greatness?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or drop us an email with a short description of the job.
Can you match the sealant to my frames?
Yes. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Are you fully insured?
Yes, we’re fully insured for every job we do.
Why deal with it now?
The work is quick compared with the damage it prevents: it takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. Homes in smaller places like Greatness can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
What you pay reflects the work, not a rough estimate. That is why we ask about the job first and give you a clear price before we start.
Why Greatness customers choose us
- 180+ five-star Google reviews
- We agree the colour with you first
- Tidy, careful work
- ARBOMaster approved applicator
DIY versus a professional finish
If you are 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 fails, we can still redo it.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Frames and glazing around Greatness
Historic houses like Knole House (about 1.7 miles south) are a reminder that the area around Greatness has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around St John the Baptist, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like St John's Church of England Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Bat & Ball station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Greatness is about 1 mile north-east of Sevenoaks, in Kent. Homes, rented property, offices and hotels in Greatness is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Our Kent coverage runs to 922 places, and Greatness is one of them. Our London page covers work nearby (19 miles or so).
Jobs for window mastic in TN13, TN14 and TN15 works the same way as everywhere else we cover. Streets in the area include Seal Road, Mill Lane and Sandy Lane, and we cover them all. Neighbouring places we cover for window mastic include Seal (1 mile east), Godden Green (2 miles south-east), Styants Bottom (3 miles east), Bitchet Green (3 miles south-east) and Stone Street (3 miles south-east). We also work in nearby towns such as Maidstone (14 miles east), Dartford (11 miles north), Royal Tunbridge Wells (11 miles south), Gravesend (12 miles north-east), Tonbridge (7 miles south-east) and Northfleet (12 miles north-east).
Near you in Greatness
In Greatness, that means homes and buildings near The Old Bat and Ball pub, Wildernesse School and Knole Academy and the streets around them. There’s a railway station in Greatness itself: Bat & Ball station. Nearby you’ll also find Sevenoaks Museum (1.3 miles south) and Kemsing Castle Bank (1.7 miles north-east). For a walk, there’s Dryhill Nature Reserve.
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Avoid blasting the frames with a pressure washer
- Walk round the house once a year and look at the joints
- Use gentle cleaners on frames and sealant
- Avoid harsh chemicals near the mastic
Most silicone sealants will not take paint, so if you’re planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.