Kent · England
Window & door mastic in Knockholt Pound, Kent
Our applicators work in Knockholt Pound on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Hard, cracked sealant around windows
- Cold air getting in at the frame edge
- Water coming in at the bottom corners of a door
Knockholt Pound questions
Do you cover smaller places like Knockholt Pound?
Yes, Knockholt Pound is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you do window mastic in Knockholt Pound?
Yes. Our work covers London and the South East, and Knockholt Pound is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
How much does window mastic cost in Knockholt Pound?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or email us.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
Window mastic for homes and businesses in Knockholt Pound
If you can feel air around a shut window, the gap is often at the frame. A new joint stops the air getting through and quietens the whistle on windy days. If the draught is through the window seals instead, we’ll tell you. We’re often asked to deal with cracked sealant at the sill ends and gaps between the frame and the inside reveal, across window sills, patio & French doors and timber windows & doors.
Mastic can only go onto a dry, clean joint, so window work in Knockholt Pound is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
All of our work is guaranteed for twelve months, in Knockholt Pound and everywhere else we cover.
- Location
- Knockholt Pound (TN14)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Wipe condensation off the frames
- Keep paint off silicone joints
- Avoid harsh chemicals near the mastic
- Use gentle cleaners on frames and sealant
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
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.
Leave it or put it right?
If you are painting or rendering, reseal at the same time. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. Around Knockholt Pound, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Knockholt Pound customers choose us
- You choose the colour before work begins
- Any old sealant cut out fully, not covered over
- White, clear, grey or another colour, product permitting
- 4.9 on Google from 180+ five-star reviews
Read what affects the cost or customer reviews.
What we are called out for in Knockholt Pound
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Most people get in touch after spotting something like this:
- Sealant in the wrong colour for the frame
- Old mastic that has gone black or come away
- Cracked or shrunken mastic around the frame
- Damp patches on the reveal after heavy rain
If you look after a building such as Halstead Community Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- Is VAT in the price?
- What guarantee comes with the work
- Whether you can choose the colour
- Who turns up on the day
What affects the quote in Knockholt Pound
Call for a quick quote. The main things that affect it are:
- The number and length of the joints
- Which sealant suits the joint
- The number of rooms or windows
- How easy the joints are to reach
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What we need to know
Photos by email are helpful but not essential. Please mention:
- If it’s domestic, commercial or a hotel
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before work begins.
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Worn gaskets, brush seals or a door that has dropped
- A sash or casement that won’t close properly
- Damp coming through the wall itself rather than the frame joint
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Timber windows & doors
- uPVC windows
- Aluminium frames
- Patio & French doors
- Composite doors
- Window sills
How the visit works
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it generally takes a few hours for a handful of frames, longer for a whole house. In a small place like Knockholt Pound, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry, 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.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
Getting a quote
If you’re in Knockholt Pound and need window mastic, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
Places near Knockholt Pound
What else we do in Knockholt Pound
Windows and doors in Knockholt Pound
London and the South East are among 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 Down House (about 3.2 miles west) are a reminder that the area around Knockholt Pound has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as St Katharine's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Knockholt station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Knockholt Pound is about 4 miles north-west of Sevenoaks, in Kent. Homes, rented property, offices and hotels in Knockholt Pound can book us for window mastic, old or new, large or small. Every job comes with our one-year guarantee. Our area takes in 922 places across Kent. For nearby work, see our London page.
We cover every part of the TN14 postcode area for window mastic. Whether your property is on Old London Road, Bond Close and Main Road or a nearby road, we can help. Close by, we work in Knockholt (1 mile south-west), Halstead (1 mile north-east), Sepham Heath (1 mile north-east), Pratt's Bottom (2 miles north) and Badgers Mount (2 miles north-east). We also work in nearby towns such as Dartford (10 miles north-east), Sevenoaks (4 miles south-east), Royal Tunbridge Wells (14 miles south-east), Gravesend (14 miles north-east), Tonbridge (11 miles south-east) and Northfleet (13 miles north-east).
What’s near Knockholt Pound
Typical jobs here are in homes near Polhill Bank and The Three Horseshoes pub. The closest station to Knockholt Pound is Knockholt station, roughly 2 miles north. A little further out are Orpington Hospital (3.4 miles north) and Lullingstone Castle (4.3 miles north-east). Open spaces near Knockholt Pound include Downe Bank and Betsom's Hill.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.