Greater London · England
Bandonhill Window Mastic
Mastic around window and door frames, sills and patio doors in Bandonhill, with a one-year guarantee on every job. Ask us for a quote.
- Hard, cracked sealant around windows
- Gaps between the frame and the inside reveal
- Gaps left after new windows were fitted
How we quote for window mastic
Jobs vary more than people expect. The main factors:
- The number and length of the joints
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- The product the joint needs
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
What we need to know
To help us quote quickly, let us know:
- How many joints, rooms or windows are involved
- Photos by email, if that’s easy
- Where the job is, and your postcode
- The problem you’ve noticed
Want a quote for window mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and send you a clear quote before we start.
Window mastic in Bandonhill
Frames and walls do not move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on window sills, patio & French doors and composite doors, and people most often call us about sealant in the wrong colour for the frame and draughts coming in around windows and doors.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Bandonhill (SM6, CR0, CR9)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Bandonhill
What else we do in Bandonhill
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Questions from Bandonhill
Do you cover Bandonhill for window mastic?
Yes, Bandonhill is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Waddon station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
When is the sealant fully cured?
It depends on the product and the temperature. Before we leave, we’ll tell you the cure time.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Does the work come with a guarantee?
Yes. Every job comes with our 12-month guarantee, and we are fully insured.
Can new sealant go over the old?
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.
Can new window sealant be painted?
Most silicone can’t be painted. Let us know beforehand, and we will use a paintable product where it suits.
What window mastic looks like in Bandonhill
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
Addington Palace, about 4 miles east, is one of the historic houses in the wider area around Bandonhill, and older homes nearby need a sealant that suits their walls. For site and facilities teams at buildings such as High View Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Bandonhill is about 2 miles west of Croydon, in Greater London. We provide window mastic to homes and businesses in Bandonhill and the surrounding area, as part of our work across Greater London. 764 places in Greater London are on our list, large and small. There’s also a page for London, about 10 miles away.
Jobs for window mastic in SM6, CR0 and CR9 works the same way as everywhere else we cover. We cover properties on Guy Road, Ross Road and Link Lane. Close by, we work in Beddington (1 mile north), Roundshaw (1 mile south), Wallington (1 mile west), Russell Hill (1 mile south) and Waddon (1 mile east). We also work in nearby towns such as London (10 miles north), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (10 miles north), St Pancras (11 miles north) and Shoreditch (11 miles north).
Landmarks near Bandonhill
Typical jobs here are in homes near Wilson's School, Beddington Park and The John Fisher School, among other places. The closest station to Bandonhill is Waddon station, roughly 0.7 miles east. A little further out are Purley War Memorial Hospital (1.8 miles south-east) and Croydon Airport Visitor Centre (0.8 miles south-east). Not far away are Duppas Hill and Roundshaw Downs.
Why act early in Bandonhill
If you are painting or rendering, reseal at the same time. Fresh joints finish the job neatly, 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 by the time it shows on a wall or ceiling in Bandonhill, the repair is bigger than the sealant job would have been.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- 12-month guarantee on every job
- ARBOMaster approved applicator
- A choice of colours where the product allows
- Over 20 years’ experience
Take a look at our cost guide and our reviews.
What we cannot put right
We’ll always be straight with you, so here’s what sealant cannot fix:
- Worn gaskets, brush seals or a door that has dropped
- Faulty window hardware
- Rotten timber, which needs a joiner first
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Surfaces we seal
- Timber windows & doors
- Patio & French doors
- Window sills
- Composite doors
- uPVC windows
- Aluminium frames
Signs you need window mastic in Bandonhill
Mastic ages in the weather. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
It’s worth asking for a quote if you see:
- White mastic on grey or black frames
- Rain getting in at the frame or under the sill
- Mastic that is falling out in pieces
- Cracked internal joints between frame and plaster
Bandonhill is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Questions to ask before booking
- How hidden problems are handled
- What insurance they hold
- The length of the guarantee
- When the joint can take water or movement
How it works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours for a handful of frames, longer for a whole house. In Bandonhill, as in most of London, parking needs a little planning. 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.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
- Let us know about earlier repairs to the joints
Getting a quote
We quote each job on its own, so the first step is telling us about yours. Just phone 0345 464 0079 or send us an email with the details and send pictures if you have them.
Related advice
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured for the work.