Greater London · England
Window Mastic in Single Street
Mastic around window and door frames, sills and patio doors for Single Street, backed by a one-year guarantee. Ask us for a quote.
- Mastic that has split away from the wall
- Mastic that is falling out in pieces
- Cracked internal joints between frame and plaster
Window mastic in Single Street, done properly
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you have cracked sealant at the sill ends and sealant in the wrong colour for the frame, we can put it right.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
All our work comes with our 12-month guarantee.
- Place
- Single Street (TN16)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work cannot fix
New sealant can’t fix everything, and we’ll tell you before any work starts. Sealant won’t put right:
- A sash or casement that will not close properly
- Penetrating damp from a failed cavity tray or render
- Soft or decayed wood in the frame
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Composite doors
- Window sills
- Aluminium frames
- Patio & French doors
- Timber windows & doors
- uPVC windows
What affects the cost of window mastic
We quote each job individually. This is what makes a difference:
- The old material and how stubborn it is
- The number of rooms or windows
- How much there is to do
- Whether there’s mould to deal with
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Helping us quote
What to tell us when you ask for a quote:
- What’s wrong with the joints now
- Whether it’s a home or a business
- Where the job is, and your postcode
- Roughly how big the job is
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Don’t aim a pressure washer at the joints
- Look round the frames every year or so
- Air rooms to keep condensation down around windows
- Keep solvents and bleach off the sealant
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Window mastic in Single Street: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Down House (about 1 mile north-west) are a reminder that the area around Single Street has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Single Street is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near Chelsfield station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Schools such as Cudham Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Single Street is about 5 miles south of Orpington, in Greater London. Jobs in Single Street get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Greater London, we cover 764 places, Single Street among them. London is on our list too, about 14 miles from Single Street.
We cover every part of TN16 for window mastic and the streets around it. Window mastic is available to properties on Berry's Hill and Single Street and the roads around them. Close by, we work in Berry's Green (1 mile south), Luxted (1 mile north-west), Cudham (1 mile east), Aperfield (1 mile south-west) and Horns Green (1 mile south-east). Further out, we also cover London (14 miles north-west), Whitechapel (15 miles north-west), Stockwell (13 miles north-west), Orpington (5 miles north), Wimbledon (14 miles north-west) and Plaistow (14 miles north).
Near you in Single Street
Around Single Street, our work takes us to homes and buildings near Charles Darwin School and The Old Jail Public House. The nearest railway station is Chelsfield station, about 3.3 miles north-east. Well-known places in the area include Princess Royal University Hospital (3.3 miles north) and Crofton Roman Villa (3.9 miles north). The countryside around Single Street includes Betsom's Hill and Downe Bank.
What happens on the day
We bring everything the job needs with us. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes most of a day for a typical house, less for a few frames. For a job in Single Street, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- 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.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
How to get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Advice
Nearby places to Single Street
More services for Single Street
Should I try it myself first?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
How the job changes by surface
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We’ll point out any rot we find, as a joiner will need to deal with it.
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Common questions in Single Street
Is parking a problem for a job in Single Street?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you do window mastic in Single Street?
Yes, Single Street is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Do you work for landlords and businesses?
Yes, we do. We work in homes, commercial premises and hotels, and we’re fully insured.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
Can I paint over the new sealant?
Not usually, if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Is the work guaranteed?
Yes. Our 12-month guarantee covers every job, inside or out.
Can you do several jobs on one visit?
Of course. Doing several areas at once is generally more efficient.
Are you fully insured?
Yes. We’re fully insured.