Greater London · England
Canary Wharf Window Mastic
Mastic around window and door frames, sills and patio doors in Canary Wharf, with a 12-month guarantee on every job. Ask us for a quote.
- Cracked sealant at the sill ends
- Old mastic that has gone black or come away
- Draughty joints inside around the window
How we handle window mastic in Canary Wharf
Whether it’s one leaking patio door or every frame on the house, the work is priced before anything is done. To get one, call 0345 464 0079 or drop us an email with the number of frames and any access details. We are often asked to deal with rushed sealant from a window installation and cracked internal joints between frame and plaster, on uPVC windows, patio & French doors and window sills.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- Canary Wharf (E14, SE16, E22)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Canary Wharf
Water runs down the glass onto the sill, and the ends of the sill, where it meets the wall, are where it gets in. When that sealant fails, water gets into the wall or under the frame.
Most people get in touch after spotting something like this:
- Mastic that has split away from the wall
- Old mastic that has gone black or come away
- Sealant in the wrong colour for the frame
- Rushed sealant from a window installation
Rented homes near Canary Wharf station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Comparing quotes
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
- Whether all the old sealant comes out first
- What guarantee comes with the work
Also near Canary Wharf
More services for Canary Wharf
How the job changes by surface
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the threshold joint takes a lot of water. We prepare and reseal every joint, backing the deep ones.
How it works
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes most of a day for a typical house, less for a few frames. In a London area like Canary Wharf, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry.
- 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
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
How to get a quote
Need a quote? Please phone 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear price before any work starts.
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Canary Wharf questions
Is parking an issue for window mastic in Canary Wharf?
Parking in Canary Wharf, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you help a landlord with a rental near Canary Wharf station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Is it messy?
We keep the work tidy. We protect what’s around the joints, and we clear up when we’re done.
Do the sealants smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
What information do you need?
Let us know what needs doing and where. If we need more, we will ask.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Canary Wharf, along with the rest of our area.
Can I paint over the new sealant?
It depends on the sealant. Silicone isn’t paintable, but some hybrid sealants are. Mention any painting plans before we start.
Are you fully insured?
Yes. Full insurance covers our work.
Should I try it myself first?
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.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Do not paint over the silicone
- Look round the frames every year or so
- Don’t use solvent cleaners on the joint
- Keep timber frames painted
Silicone cannot usually be painted, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
What affects the quote in Canary Wharf
Some jobs are bigger than they look, and some smaller. The main factors:
- Whether old sealant or filler has to be cut out
- Access and height
- The number of rooms or windows
- Which sealant suits the joint
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- If someone has resealed it before
- Whether it’s a home or a business
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
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 email pictures if that is easy.
Canary Wharf homes and the weather
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Canary Wharf is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Homes close to St Peter's Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Canary Wharf is about 2 miles north-west of Greenwich, in Greater London. For window mastic in and around Canary Wharf, please call 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base, Canary Wharf included. 764 places in Greater London are on our list.
We work across E14, SE16 and E22 for window mastic. Window mastic is available to properties on Castor Lane, Cassilis Road and Dockyard Lane and the roads around them. Being close to the A1261, Canary Wharf is simple for us to get to for window mastic. We also cover the places around Canary Wharf: London Docklands (1 mile east), Poplar (1 mile north-east), Heron Quays (1 mile south-west), Coldharbour (1 mile east) and Blackwall (1 mile east). We also work in nearby towns such as London (3 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (4 miles west) and Shoreditch (3 miles north-west).
Near you in Canary Wharf
Locally, jobs take us to homes and businesses close to Tower Hamlets College, Sir John McDougall Gardens and The Ledger Building pub and the streets around them. There’s a railway station in Canary Wharf itself: Canary Wharf station. A little further out are The Pumphouse Educational Museum (0.8 miles west) and Surrey Quays Shopping Centre (1.4 miles south-west). The countryside around Canary Wharf includes St. James's Park Lake and Tower Hill.
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.