Greater London · England
Riddlesdown Window Mastic
Window mastic in Riddlesdown from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- White mastic on grey or black frames
- Water coming in at the bottom corners of a door
- Whistling draughts around closed windows
Window mastic for homes and businesses in Riddlesdown
Around Riddlesdown we seal all kinds of frames: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. If you have untidy mastic left by window fitters and rain getting in at the frame or under the sill, we can put it right.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Riddlesdown as anywhere.
Our work is backed for twelve months.
- Location
- Riddlesdown (CR8, CR2)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Do you need window mastic in Riddlesdown?
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
Common reasons people contact us include:
- Mastic that’s falling out in pieces
- Cracked internal joints between frame and plaster
- Damp patches on the reveal after heavy rain
- White mastic on grey or black frames
Schools such as Harris Primary Academy Kenley are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- How the colour is chosen
- What the quote includes, VAT included or not
- Who does the work, and how experienced they are
- Are they insured?
How it works
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of frames, longer for a whole house, and the area is left clean. For a job in Riddlesdown, 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.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
How to prepare
- Clear items away from the joints we’re working on
- Let us know about earlier repairs to the joints
- Plan for the work area to be out of bounds to pets and children
Get a quote
There’s no standard price list. Instead, we give you a clear quote for your job. To arrange one, ring 0345 464 0079 or send us an email.
Advice
Quotes for window mastic in Riddlesdown
Jobs vary more than people expect. The main factors:
- Any working-time requirements on site
- The type of sealant required
- How many areas need sealing
- Whether old sealant or filler has to be cut out
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
What we need to know
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- How we’d reach the joints
- If someone has resealed it before
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Aftercare tips
A little care helps the new joints last. We recommend:
- Keep paint and stain on wooden frames in good order
- Paint up to the joint, not over it
- Clean frames with a soft cloth and soapy water
- Clear any debris from frame drain holes
Most silicone sealants will not take paint, so mention any painting plans before we start. We can use a paintable sealant where that matters.
Wet, windy weather is when failed mastic shows itself, 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.
Also near Riddlesdown
What else we do in Riddlesdown
Riddlesdown: your questions answered
Is Riddlesdown in your area for window mastic?
Yes, Riddlesdown is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you work for landlords with property near Riddlesdown station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint before we leave.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or drop us an email.
Where are you based?
We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Landlords and agents in Riddlesdown can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Window mastic in Riddlesdown: local notes
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as St Edmund's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Riddlesdown can be tricky for parking: let us know about parking bays, permits or a driveway.
Riddlesdown is about 1 mile east of Purley, in Greater London. Whether you are in the middle of Riddlesdown or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Riddlesdown is one of 764 towns and villages in Greater London we cover for window mastic. For nearby work, see our London page, about 12 miles away.
Jobs for window mastic in CR8 and CR2 is quoted and booked the same way as anywhere else. If you need window mastic at a property on Hyde Road, Lower Road and Famet Avenue or anywhere close by, we can help. Riddlesdown sits on or near the A22, so getting to you is simple. Neighbouring places we cover for window mastic include Kenley (1 mile south), Sanderstead (1 mile north-east), South Croydon (2 miles north), Hamsey Green (2 miles south-east) and Whyteleafe (2 miles south). Larger places within reach include London (12 miles north), City of Westminster (13 miles north), Marylebone (13 miles north), Kensington (13 miles north), St Pancras (14 miles north) and Shoreditch (13 miles north).
Near you in Riddlesdown
Around Riddlesdown, our work takes us to homes and buildings near Riddlesdown Collegiate and Dollypers Hill and the streets around them. There’s a railway station in Riddlesdown itself: Riddlesdown station. Well-known places in the area include Croydon Airport Visitor Centre (2 miles north-west) and Purley War Memorial Hospital (1 mile north-west). Green spaces nearby include Duppas Hill and Foxley Wood.
What sealant work cannot fix
We will not take on work that won’t last, so here’s what sealant can’t put right:
- Rotten timber, which needs a joiner first
- Damp coming through the wall itself rather than the frame joint
- Misting between the panes of a double-glazed unit (that needs a new unit)
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before you book.
Where we work in Riddlesdown
- Aluminium frames
- Window sills
- Composite doors
- Timber windows & doors
- Patio & French doors
- uPVC windows
Leave it or put it right?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or drop us an email.
Why us?
- Every job guaranteed for a year
- We never seal over old sealant
- Anti-fungal silicone where joints get wet
- Neat joints and a tidy finish
Take a look at what affects the cost or what customers say.