Kent · England
Window Mastic in Kemsing
Our applicators work in Kemsing on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Draughty joints inside around the window
- Rain getting in at the frame or under the sill
- Draughts coming in around windows and doors
Windows and doors in Kemsing
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Knole House (about 2.8 miles south) nearby, there’s older building stock in the area around Kemsing as well as newer homes. 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 look after a building such as Kemsing Primary School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Otford station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Kemsing is about 2 miles north-east of Sevenoaks, in Kent. Kemsing gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 922 places across Kent. There’s also a page for London, about 19 miles away.
Postcode districts we cover here for window mastic: TN15. Window mastic is available to properties on High Street, Copperfields Walk and Childsbridge Lane. Neighbouring places we cover for window mastic include Cotman's Ash (1 mile north-east), Heaverham (2 miles east), Woodlands (2 miles north-east), Romney Street (2 miles north) and Knatts Valley (2 miles north-east). Further out, we also cover Maidstone (14 miles east), Dartford (9 miles north), Royal Tunbridge Wells (12 miles south), Gravesend (11 miles north-east), Tonbridge (8 miles south) and Northfleet (10 miles north-east).
What’s near Kemsing
In Kemsing, that means homes and buildings near St Michael's Preparatory School, Knole Academy and Kemsing Down. The closest station to Kemsing is Otford station, roughly 1 mile north-west. Other landmarks nearby include Kemsing Castle Bank (0.5 miles east) and Otford Heritage Centre (1 mile west). Not far away are Dryhill Nature Reserve.
How we handle window mastic in Kemsing
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. We work on window sills, patio & French doors and aluminium frames, and common reasons people get in touch are old mastic that has gone black or come away and hard, cracked sealant around windows.
Around Kemsing, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows.
There’s a 12-month guarantee on every job, large or small.
- Where
- Kemsing (TN15)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Kemsing
What else we do in Kemsing
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Avoid blasting the frames with a pressure washer
- Wash the frames with mild soapy water
- Keep drainage slots and sill grooves clear
- Walk round the house once a year and look at the joints
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Kemsing questions
I let a flat near Otford station. Can you help?
Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or email us with the details for a clear quote.
Do you cover Kemsing for window mastic?
Yes, Kemsing is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Do you guarantee window mastic?
Yes, with our one-year guarantee. A yearly look at the joints helps them last.
Is the new sealant paintable?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is usually more efficient, so mention them when you ask for a quote.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll tell you what we’re using.
Can you do upstairs windows?
Yes, where they can be reached safely. Tell us about access when you get in touch and we will plan for it.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
What we can’t put right
We’ll always be straight with you, so here’s what sealant cannot fix:
- Broken hinges, locks or handles
- A door that needs adjusting, rehanging or new seals
- Damp problems in the wall away from the window
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Window sills
- uPVC windows
- Aluminium frames
- Composite doors
- Timber windows & doors
- Patio & French doors
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Landlords, agents and businesses in Kemsing
Letting agents and landlords in Kemsing can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured.
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a morning for a couple of windows and a door. A visit to Kemsing is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Mention if the joints have been sealed before
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we’re working on
Getting a quote
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
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What the job involves on each surface
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. If we find rot, we’ll tell you before going ahead, as a joiner will need to deal with it.
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so we pay close attention there.
Signs you need window mastic in Kemsing
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, while a joint packed solid can’t stretch. That is what backing rod is for.
The most common problems we see are:
- Mastic that’s falling out in pieces
- Draughts coming in around windows and doors
- Leaking joints at the ends of sills
- Gaps left after new windows were fitted
Homes close to Church of St Mary include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before you book anyone
- What guarantee comes with the work
- Whether the sealant suits the joint
- What preparation is included
- Whether all the old sealant comes out first