Greater London · England
Window & door mastic in Croydon, Greater London
Mastic around window and door frames, sills and patio doors for Croydon, backed by a 12-month guarantee. Ask us for a quote.
- Old mastic that has gone black or come away
- Cold air getting in at the frame edge
- Hard, cracked sealant around windows
How we handle window mastic in Croydon
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on composite doors, timber windows & doors and uPVC windows, and the jobs we see most are cracked sealant at the sill ends and hard, cracked sealant around windows.
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.
We stand behind the work with a 12-month guarantee.
- Where
- Croydon (CR0, CR2, CR9, CR8)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When it isn’t the sealant
A few problems are outside what sealant work can do:
- Soft or decayed wood in the frame
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before you book.
Where we work in Croydon
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Window sills
- Composite doors
Surface by surface
Aluminium frames
Coated aluminium needs a compatible sealant and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We will point out any rot we find, as a joiner will need to deal with it.
FAQs for Croydon
Is parking a problem for a job in Croydon?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you work for landlords with property near South Croydon station?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Do you work on first-floor windows?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Is it messy?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Does the work come with a guarantee?
Yes. All our work carries a 12-month guarantee, and we are fully insured.
Can you match the sealant to my frames?
Yes. We can use white, brown, anthracite grey, black or clear.
How long does it take to reseal the windows on a house?
A few frames take a few hours, while a whole house takes longer. You’ll get a timescale with the quote.
Signs you need window mastic in Croydon
Some failures date back to when the windows were fitted. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, so it comes away long before its time.
Look out for these signs:
- Draughts coming in around windows and doors
- Old mastic that has gone black or come away
- Leaking joints at the ends of sills
- A bead that does not match the frame
In the older streets around St Andrew's, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- How the colour is chosen
- Who does the work, and how experienced they are
- Whether VAT is included
- Which sealant they’ll use, and why
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Places near Croydon
What else we do in Croydon
Why it’s worth doing now in Croydon
Failed mastic is not a reason to replace sound windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we’ll say so. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Croydon, the repair is bigger than a sealant job.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and give you a clear quote before any work starts.
What you get with us
- Neat joints and a tidy finish
- More than 20 years in sealant work
- Approved under the ARBOMaster scheme
- Quality sealants from Arbo and Everbuild
Take a look at how sealant jobs are priced and customer reviews.
What affects the quote in Croydon
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The product the joint needs
- Whether there’s mould to deal with
- When we can work, for business premises
- Access and height
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or send us an email and we’ll talk you through it.
What we need to know
To make quoting easier, let us know:
- A few pictures by email, if you can
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
Want a quote for window mastic? Please call 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
The process
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours for a few frames, or a day or more for a whole house from start to finish. In a London area like Croydon, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Getting ready for the visit
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
- Plan for the work area to be out of bounds to pets and children
Getting a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Read more
Window mastic in Croydon: local notes
Historic houses like Addington Palace (about 2.5 miles east) are a reminder that the area around Croydon has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
For site and facilities teams at buildings such as Heathfield Academy, its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to South Croydon station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Croydon is about 9 miles south of London, in Greater London. Whether you’re in the middle of Croydon or further out, window mastic is available for homes and businesses alike. Croydon is one of 764 towns and villages in Greater London where we work for window mastic. For nearby work, see our London page.
Jobs for window mastic in CR0, CR2, CR9 and CR8 is quoted and booked the same way as anywhere else. Whether your property is on High Street, Church Road and Ruskin Square or anywhere close by, our applicators can take on the job. Croydon is on the A235 and B243, which makes it straightforward to reach. Nearby, we also carry out window mastic in South Croydon (1 mile south), Coombe (1 mile east), Addiscombe (2 miles north-east), Ashburton (2 miles north-east) and Woodside (2 miles north-east). Further out, we also cover London (9 miles north), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (10 miles north-west), St Pancras (11 miles north) and Shoreditch (11 miles north).
Landmarks near Croydon
We work in homes and buildings around Cambridge Tutors College, Rutherford School and Keg & Grill pub. Croydon has its own railway station: South Croydon station. Other landmarks nearby include Croydon Airport Visitor Centre (1.2 miles south-west) and Croydon University Hospital (1.7 miles north). For a walk, there’s Roundshaw Downs and Duppas Hill.