Greater London · England
Window & door mastic in Norbury, Greater London
Window and door frames in Norbury need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Mastic that is falling out in pieces
- Sealant in the wrong colour for the frame
- Whistling draughts around closed windows
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
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, then guaranteed for a year.
How we handle window mastic in Norbury
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. Typical jobs include water coming in at the bottom corners of a door and a bead that doesn’t match the frame, on composite doors, patio & French doors and uPVC windows.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking, and access in Norbury is something to talk through when you book.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Norbury (CR7, SW16, SE19)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why act early in Norbury
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Norbury, the repair is bigger than a sealant job.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why book with us
- Rated 4.9 stars on Google
- We’re fully insured
- Approved under the ARBOMaster scheme
- Over 20 years’ experience
Take a look at what affects the cost or customer reviews.
Landlords, agents and businesses in Norbury
If you manage several properties in or around Norbury, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
How it works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from an hour or two to a full day, depending on how many frames there are. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Before we arrive
- Let us know about earlier repairs to the joints
- Clear the area around the work
- For business premises, tell us about site rules or sign-in
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Related advice
Window mastic in Norbury: local notes
With historic houses such as Kingswood House (about 1.9 miles north-east) nearby, there’s older building stock in the area around Norbury as well as newer homes. 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. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
If you let a flat or house near Norbury station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you live in an older home near St Oswald, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Kensington Avenue Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Norbury is about 1 mile north of Thornton Heath, in Greater London. Across the CR7 area, our applicators can take on window mastic. Our Greater London coverage runs to 764 places, Norbury among them. We also work in London, around 6 miles away.
Work in CR7, SW16 and SE19 works the same way as everywhere else we cover. If you need window mastic at a property on Green Lane, Croft Road and Downs Road or a nearby road, our applicators can take on the job. Other places close to Norbury include Pollards Hill (1 mile north), Thornton Heath (1 mile south), Streatham (2 miles north-west), Streatham Park (2 miles north-west) and Mitcham (2 miles west). We also work in nearby towns such as London (6 miles north), City of Westminster (8 miles north), Marylebone (8 miles north), Kensington (7 miles north-west), St Pancras (8 miles north) and Shoreditch (8 miles north).
Around Norbury
We work in homes and buildings around Norbury Manor Business and Enterprise College for Girls, Grangewood Park and Silburn Reid and the streets around them. Norbury’s nearest station is Norbury station, about 0.6 miles west. Well-known places in the area include Crystal Palace Museum (1.5 miles north-east) and Croydon University Hospital (1.3 miles south). For a walk, there’s Knight's Hill and Biggin Wood.
Nearby places to Norbury
What else we do in Norbury
What the job involves on each surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so we use a flexible, low-modulus sealant. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Composite doors
Front doors take the weather head on. We pay most attention there.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Keep timber frames painted
- Keep jet washers away from the mastic
- Wipe condensation off the frames
- Clear any debris from frame drain holes
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just ring 0345 464 0079 or send us an email.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.
Your questions about window mastic in Norbury
Is parking a problem for a job in Norbury?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Can you do window mastic in Norbury?
Yes. We work across London and the South East, and Norbury is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Will resealing my frames help with draughts?
In many cases. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or email us.
When it isn’t the sealant
We’d rather tell you now than do work that will not last, so these are the limits:
- A failed sealed unit that has misted up
- Worn gaskets, brush seals or a door that has dropped
- Damp problems in the wall away from the window
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think before booking.
Where we work in Norbury
- uPVC windows
- Composite doors
- Patio & French doors
- Aluminium frames
- Window sills
- Timber windows & doors