Kent · England
Window & door mastic in Key's Green, Kent
Window mastic for Key's Green, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
- White mastic on grey or black frames
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Window mastic for homes and businesses in Key's Green
Around Key's Green we seal all kinds of frames: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Typical jobs include cracked internal joints between frame and plaster and mastic that’s falling out in pieces, on patio & French doors, window sills and composite doors.
Homes in small places like Key's Green often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
All our work is covered by a 12-month guarantee.
- Where
- Key's Green (TN12)
- Region
- Kent
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need window mastic in Key's Green
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
Look out for these signs:
- Rain getting in at the frame or under the sill
- Black, perished sealant on frames
- Draughts coming in around windows and doors
- Cracked internal joints between frame and plaster
Rented homes near Frant station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Questions to ask before booking
- Is the old sealant removed completely?
- What happens if they find a problem under the old sealant
- What insurance they hold
- How the surfaces are prepared before sealing
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Keep drainage slots and sill grooves clear
- Air rooms to keep condensation down around windows
- Keep solvents and bleach off the sealant
- Don’t aim a pressure washer at the joints
Most silicone sealants won’t 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.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and a cold room gets colder. A new joint closes it up.
Key's Green: your questions answered
Is Key's Green within the area you cover?
Yes, Key's Green is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Frant station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can new window sealant be painted?
Not generally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Do you have sealant for grey or black windows?
Normally, yes. Mention the frame colour when you ask for a quote and we will use the nearest match.
Will resealing my frames help with draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Will the old sealant be removed?
Yes, every time. New silicone does not stick to old silicone, so the joint is cleaned back first.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Surface by surface
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We’ll point out any rot we find, as that’s a job for a joiner.
Composite doors
A composite door normally sits in a plastic outer frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.
What happens on the day
You do not need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the work takes most of a day for a typical house, less for a few frames for a typical job. Somewhere like Key's Green needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- 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.
- Finally we tidy up and check each joint.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.
Advice
Also near Key's Green
Other services in Key's Green
Why it’s worth doing now in Key's Green
Working on frames from a ladder with a sealant gun isn’t easy, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Around Key's Green, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- More than 20 years in sealant work
- Full insurance on every job
- We never seal over old sealant
Take a look at how sealant jobs are priced and customer reviews.
Frames and glazing around Key's Green
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Scotney Castle (about 3.6 miles south-east) are a reminder that the area around Key's Green has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you live in an older home near Chapel Of Ease Of St Luke, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Key's Green is about 4 miles east of Royal Tunbridge Wells, in Kent. Across the TN12 area, our applicators can take on window mastic. Our Kent coverage runs to 922 places, Key's Green among them. You can also see our page for Crawley, about 24 miles away.
We work across TN12 for window mastic and the streets around it. That includes homes and businesses on Cryals Road and Beech Lane and the roads around them. We also cover the places around Key's Green: Lamberhurst Quarter (1 mile south), Petteridge (1 mile north-east), Pembury (2 miles north-west), Matfield (2 miles north-east) and Brenchley (2 miles north-east). Further out, we also cover Maidstone (12 miles north-east), Sevenoaks (13 miles north-west), Royal Tunbridge Wells (4 miles west), Tonbridge (6 miles north-west), Kings Hill (10 miles north) and Foley Park (13 miles north-east).
Local landmarks in Key's Green
In Key's Green, that means homes and buildings near Brenchley Wood and The Blue Boys Inn. Key's Green’s nearest station is Frant station, about 3.5 miles south-west. Nearby you’ll also find Pembury Hospital (2.4 miles north-west) and Old Scotney Castle (3.7 miles south-east). The countryside around Key's Green includes Bewl Water and Tudeley Woods RSPB reserve.