Greater London · England
Window Mastic in Force Green
Window mastic for Force Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Draughts coming in around windows and doors
- Mastic that has split away from the wall
- Cracked internal joints between frame and plaster
Aftercare tips
A little care helps the new joints last. We recommend:
- Ventilate rooms so frames don’t stay wet inside
- Avoid harsh chemicals near the mastic
- Wash the frames with mild soapy water
- Check the mastic once a year
Keep the new mastic undisturbed while it cures, for as long as we advise. Don’t point a pressure washer at the joints.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Window mastic in Force Green, done properly
Over two decades of sealing frames has taught us which products suit which walls. We are ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. Common call-outs are for mastic that’s falling out in pieces and rain getting in at the frame or under the sill, across timber windows & doors, window sills and composite doors.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
All of our work is guaranteed for twelve months, in Force Green and everywhere else we cover.
- Where
- Force Green (TN16)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
How we quote for window mastic
The quote reflects the job in front of us. We look at:
- How easy the joints are to reach
- The type of sealant required
- When we can work, for business premises
- Mould in or behind the old joints
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- The type of property
- The address or postcode of the job
- Any access issues, like height or stairs
- Photos by email, if that’s easy
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved.
Windows and doors in Force Green
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. With historic houses such as Quebec House (about 0.8 miles south) nearby, there’s older building stock in the area around Force Green as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Force Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For landlords with property near Oxted station, renewing tired window mastic between tenants heads off draught and damp complaints. If you live in an older home near Church of St Mary the Virgin, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Force Green is about 5 miles west of Sevenoaks, in Greater London. We provide window mastic to homeowners, landlords and businesses in Force Green. Force Green is one of 764 towns and villages in Greater London where we work for window mastic. There’s also a page for Crawley, about 16 miles away.
Here we cover the TN16 postcode area for window mastic. We also cover the places around Force Green: Westerham (1 mile south), South Street (2 miles north-west), Moorhouse Bank (2 miles south-west), Tatsfield (2 miles north-west) and Titsey (2 miles west). Within a short drive, we also cover Orpington (7 miles north), New Cross (14 miles north), Thornton Heath (12 miles north-west), Croydon (10 miles north-west), East Dulwich (14 miles north-west) and Plumstead (14 miles north).
Around Force Green
We work in homes and buildings around The Olde House At Home Public House. For rail, the closest station is Oxted station, about 3.8 miles south-west of the centre. Nearby you will also find Tandridge Priory (2.7 miles south-west). Not far away are Dryhill Nature Reserve and Betsom's Hill.
Common questions in Force Green
Can parking be tricky for a visit in Force Green?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you cover Force Green for window mastic?
Yes, Force Green is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
Can I add another job to the visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Where are you based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Can new sealant go over the old?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Surface by surface
uPVC windows
uPVC expands and contracts noticeably with temperature, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Timber windows & doors
Older timber windows in stone or brick can suit sand mastic rather than modern sealant. We can talk through the options.
Why it’s worth doing now in Force Green
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. In a flat in Force Green, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
What you get with us
- Colour picked to suit the job
- Arbo and Everbuild products
- A 12-month guarantee on all work
- White, clear, grey or coloured to suit, where the product allows
See what affects the cost or our reviews.
Places near Force Green
More services for Force Green
Honest limits
We will not take on work that will not last, so these are the limits:
- A door that needs adjusting, rehanging or new seals
- A failed sealed unit that has misted up
- Damp problems in the wall away from the window
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- uPVC windows
- Composite doors
- Window sills
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a morning for a couple of windows and a door, depending on how much there is to do. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Force Green. It helps if you can point us to a visitor permit or a bay close to the door.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
How to prepare
- Mention if the joints have been sealed before
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
Ask for a quote
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before any work starts.