Greater London · England
Window & door mastic in South Street, Greater London
Mastic around window and door frames, sills and patio doors for South Street, backed by a 12-month guarantee. Call for a quick quote.
- Sealant in the wrong colour for the frame
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
What window mastic looks like in South Street
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of St Mary the Virgin, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you look after a building such as Charles Darwin School, its window and door frames need their mastic kept sound, just like a home’s.
South Street is about 4 miles north-east of Oxted, in Greater London. Homes, rented property, offices and hotels in South Street can book us for window mastic, old or new, large or small. Every job comes with our one-year guarantee. Our Greater London coverage runs to 764 places, and South Street is one of them. We also work in London, about 15 miles from South Street.
Every address in TN16 is within our area for window mastic. We also cover the places around South Street: Tatsfield (1 mile west), Force Green (2 miles south-east), Titsey (2 miles south-west), Westerham (2 miles south-east) and Moorhouse Bank (3 miles south). Within a short drive, we also cover London (15 miles north-west), Stockwell (14 miles north-west), Orpington (6 miles north), Wimbledon (14 miles north-west), Kennington (15 miles north-west) and New Cross (13 miles north).
What’s near South Street
The nearest railway station is Oxted station, roughly 3.7 miles south-west of the centre. Other landmarks nearby include Tandridge Priory (3.2 miles south). Open spaces near South Street include West Kent Golf Course nature reserve and Betsom's Hill.
How we handle window mastic in South Street
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that cannot move properly, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. We work on composite doors, patio & French doors and window sills, and common reasons people get in touch are draughty joints inside around the window and sealant in the wrong colour for the frame.
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.
Every job is covered by our one-year guarantee, wherever you are in Greater London.
- Where
- South Street (TN16)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
If you manage several properties in or around South Street, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
The process
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours for a handful of frames, longer for a whole house. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in South Street. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Move anything stored near the joints
- Mention any tricky access
- Let us know about parking restrictions
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work and give you a clear quote.
Related advice
When something else is needed
Before you book, it’s worth knowing the limits:
- Condensation trapped between the panes
- A door that needs adjusting, rehanging or new seals
- A sash or casement that won’t close properly
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Window sills
- Timber windows & doors
- uPVC windows
- Composite doors
- Patio & French doors
- Aluminium frames
Towns and villages near South Street
Other services in South Street
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, 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.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Common problems we fix in South Street
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
It’s worth asking for a quote if you see:
- Whistling draughts around closed windows
- Sealant in the wrong colour for the frame
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
As a London address, South Street can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- Whether you can choose the colour
- What product goes in the joint
- Who turns up on the day
- What preparation is included
Your questions about window mastic in South Street
I let a flat near Oxted station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Is parking a problem for a job in South Street?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Is the new sealant paintable?
Silicone generally will not take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Are you ARBOMaster approved?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do you seal inside as well as outside?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Will resealing my frames help with draughts?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we’ll tell you.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.
How to look after the new joints
A little care helps the new joints last. Our advice:
- Repaint timber before it’s bare
- Clean frames with a soft cloth and soapy water
- Ventilate rooms so frames don’t stay wet inside
- Look round the frames every year or so
Silicone cannot usually be painted, so mention any painting plans before any work starts. There are paintable sealants for joints that need it.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.
Why deal with it now?
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or email us.
Why book with us
- Quality sealants from Arbo and Everbuild
- We leave the area clean and tidy
- Over 20 years’ experience
- Homes, businesses and hotels
Take a look at what affects the cost and what customers say.