Kent · England
Window Mastic in The Platt
Window mastic across The Platt and nearby, with old sealant always removed completely and a one-year guarantee.
- Cold air getting in at the frame edge
- Cracked sealant at the sill ends
- Mastic that has split away from the wall
DIY versus a professional finish
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: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
How we handle window mastic in The Platt
A cold draught around a closed window often comes from the frame edge. 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’ll say so. We work on composite doors, timber windows & doors and window sills, and people most often call us about draughty joints inside around the window and cracked sealant at the sill ends.
Somewhere as small as The Platt, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or send us an email.
- Where
- The Platt (TN3)
- Region
- Kent
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
To keep the joints looking good and working properly:
- Walk round the house once a year and look at the joints
- Avoid blasting the frames with a pressure washer
- Make sure the drainage slots are not blocked
- Use gentle cleaners on frames and sealant
A yearly look round the frames is enough. Small splits are simple to catch before they leak.
Leaks generally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
The process
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours for a few frames, or a day or more for a whole house. For a village or hamlet like The Platt, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or send us an email.
Read more
Why act early in The Platt
Failed mastic is not a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we’ll tell you. In a small place like The Platt, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first.
Why choose Mr Mastic in The Platt
- A choice of colours where the product allows
- Over 20 years’ experience
- Anti-fungal sanitary silicone in wet areas
- We’re fully insured
Window mastic in The Platt: local notes
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. Historic houses like Wadhurst Castle (about 3 miles south-east) are a reminder that the area around The Platt 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.
In the older streets around The Parish Church of St Alban, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as Frant Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Frant station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
The Platt is about 4 miles south of Royal Tunbridge Wells, in Kent. Whether you are in the middle of The Platt or further out, we cover window mastic for every kind of property. The Platt is one of 922 towns and villages in Kent we cover. You can also see our page for Crawley, about 20 miles away.
Postcode districts we cover here for window mastic: TN3. We also cover the places around The Platt: Frant (1 mile north), Mark Cross (2 miles south), Eridge Green (2 miles north-west), Town Row (3 miles south-west) and Tidebrook (3 miles south). Within a short drive, we also cover Sevenoaks (14 miles north), Royal Tunbridge Wells (4 miles north), Tonbridge (8 miles north), Kings Hill (14 miles north-east), Paddock Wood (8 miles north-east) and Southborough (5 miles north).
What’s near The Platt
In The Platt, that means homes and buildings near The George Public House and Eridge Park. The nearest railway station is Frant station, about 1.7 miles north-east. Nearby you’ll also find Tunbridge Wells Homeopathic Hospital (3.4 miles north) and The Corn Exchange (2.9 miles north). For a walk, there’s Broadwater Warren RSPB Reserve.
Nearby places to The Platt
What else we do in The Platt
When something else is needed
It helps to know what we cannot do:
- A sash or casement that will not close properly
- Worn gaskets, brush seals or a door that has dropped
- Rotten timber, which needs a joiner first
If you are not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Patio & French doors
- Aluminium frames
- Composite doors
- Window sills
- Timber windows & doors
- uPVC windows
Quotes for window mastic in The Platt
Call for a quick quote. What matters most is:
- Mould in or behind the old joints
- How many areas need sealing
- The old material and how stubborn it is
- How easy the joints are to reach
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What we need to know
To make quoting easier, please include:
- What’s wrong with the joints now
- Photos by email, if that’s easy
- The type of property
- Any previous sealing or DIY work
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
What the job involves on each surface
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so they get particular care.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones are not used, as they can attack some metals. Neutral-cure sealant is the safe choice.
The Platt: your questions answered
I let a flat near Frant station. Can you help?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is The Platt within the area you cover?
Yes, The Platt is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you guarantee window mastic?
Yes. Each job is covered for 12 months, inside or out.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
When is the sealant fully cured?
It depends on the product. Before we leave, we’ll tell you the cure time.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.