Greater London · England
Window & door mastic in The Wrythe, Greater London
Specialist window mastic for The Wrythe: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Hard, cracked sealant around windows
- Black, perished sealant on frames
- Cold air getting in at the frame edge
Window mastic in The Wrythe
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. If you have rain getting in at the frame or under the sill and sealant in the wrong colour for the frame, we can help, on timber windows & doors, aluminium frames and uPVC windows alike.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in The Wrythe.
Every job comes with our 12-month guarantee.
- Place
- The Wrythe (SM5, SM6, SM1)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we cannot put right
In fairness, there are a few things sealant will not fix:
- A door that needs adjusting, rehanging or new seals
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Rotten timber, which needs a joiner first
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Timber windows & doors
- Window sills
- uPVC windows
- Composite doors
- Aluminium frames
- Patio & French doors
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll give you a quote.
The Wrythe questions
Do you work for landlords with property near Carshalton station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Is parking an issue for window mastic in The Wrythe?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you have insurance?
Yes. We are fully insured for domestic and commercial work.
Can new sealant go over the old?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you will get one quote.
Where are you based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Can new window sealant be painted?
Not if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Do you seal inside as well as outside?
Yes. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Different surfaces, different methods
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
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.
The process
At the end, we look at the finished work together. The work normally takes a few hours for a handful of frames, longer for a whole house, depending on the size of the job. For a job in The Wrythe, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
Getting a quote
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Read more
Places near The Wrythe
Other services in The Wrythe
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Keep paint off silicone joints
- Check the mastic once a year
- Keep timber frames painted
- Keep drainage slots and sill grooves clear
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
Leaks generally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Window mastic in The Wrythe: local notes
Historic houses like Nonsuch Mansion (about 2.9 miles west) are a reminder that the area around The Wrythe has older buildings as well as new. 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Carshalton station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. For an older house near a landmark such as Bishop Andrewes Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. The Wrythe is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
The Wrythe is about 7 miles south of Stockwell, in Greater London. Jobs in The Wrythe 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, The Wrythe among them. Our London page covers work nearby, about 9 miles away.
Here we cover the SM5, SM6 and SM1 postcode area for window mastic. Whether your property is on Elm Road, Byne Road and Mill Lane or a nearby road, we can help. We also cover the places around The Wrythe: Carshalton (1 mile south), Wallington (1 mile south-east), Rosehill (1 mile north-west), St Helier (1 mile north-west) and Benhilton (1 mile west). Further out, we also cover London (9 miles north), City of Westminster (10 miles north), Marylebone (10 miles north), Kensington (9 miles north), St Pancras (11 miles north) and Shoreditch (11 miles north).
Local landmarks in The Wrythe
Locally, jobs take us to homes and businesses close to Carshalton Park, The Railway Tavern and Carshalton High School for Girls. There’s a railway station in The Wrythe itself: Carshalton station. Well-known places in the area include Centrale Croydon (2.7 miles east) and Honeywood Museum (0.6 miles south). For a walk, there’s The Spinney Local Nature Reserve and Duppas Hill.
Quotes for window mastic in The Wrythe
Your quote is based on your job. We take into account:
- Which sealant suits the joint
- Whether the work is at height
- Mould in or behind the old joints
- How many areas need sealing
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, phone 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What we need to know
When you call or email, these details help:
- Access, such as stairs, a lift or height
- Whether it has been sealed before
- Pictures of the joints, sent by email
- Roughly how big the job is
Want a quote for window mastic? Please call 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before we start.