Greater London · England
Window Mastic in Canonbury
Specialist window mastic for Canonbury: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Gaps left after new windows were fitted
- Leaking joints at the ends of sills
- Cracked or shrunken mastic around the frame
Why it’s worth doing now in Canonbury
Draughts and leaks don’t always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why us?
- Homes, businesses and hotels
- Tidy, careful work
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
Read our cost guide or customer reviews.
Window mastic in Canonbury
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty. Where the air is getting in through the window itself, we’ll say so. If you have hard, cracked sealant around windows and rain getting in at the frame or under the sill, we can put it right.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Canonbury as anywhere.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Location
- Canonbury (N1, N1P, E8)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Canonbury
I let a flat near Canonbury station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Is parking a problem for a job in Canonbury?
Parking in Canonbury, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before resealing.
Are you insured?
Yes. We are fully insured.
Can you seal over the 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.
Can you reach windows above the ground floor?
Generally, yes. Access is planned before we start, so mention the height and anything in the way.
How much does window mastic cost in Canonbury?
Size, access and the old material all affect the cost. Ask us for a quote.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Signs you need window mastic in Canonbury
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:
- Gaps where the sill meets the wall
- Water coming in at the bottom corners of a door
- White mastic on grey or black frames
- Hard, cracked sealant around windows
Homes close to St Paul's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- Who does the work, and how experienced they are
- How the joint is cleaned and prepared
- How the colour is chosen
- Whether all the old sealant comes out first
Landlord and commercial work in Canonbury
Businesses can book us for washrooms, kitchens, offices and more. 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’re fully insured.
Windows and doors in Canonbury
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Canonbury is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Letting a property close to Canonbury station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Canonbury is about 2 miles north-east of St Pancras, in Greater London. Anywhere in N1, we can carry out window mastic at your property. We cover 764 towns and villages across Greater London.
All of N1, N1P and E8 is covered for window mastic, from the main roads to the quietest streets. Window mastic is available to properties on Dove Road, Essex Road and Clare Lane and the roads around them. Canonbury sits on or near the A1199 and A1200, so getting to you is simple. We also cover the places around Canonbury: De Beauvoir Town (1 mile east), Mildmay (1 mile north-east), Kingsland (1 mile east), Newington Green (1 mile north) and Highbury (1 mile north-west). Within a short drive, we also cover London (3 miles south), City of Westminster (3 miles south-west), Marylebone (3 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Hampstead (4 miles west).
Local landmarks in Canonbury
We work in homes and buildings around Bishopsgate Institute Special Collections and Archives, City of London Academy Highbury Grove and Islington Green School. Nearby too are New Crown pub (under half a mile north-west) and Shoreditch Park (0.6 miles south). Canonbury has its own railway station: Canonbury station. Well-known places in the area include Montfichet's Tower (2.2 miles south) and Clowns Gallery-Museum (0.7 miles east). For a walk, there’s St. James's Park Lake and Ludgate Hill.
DIY versus a professional finish
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.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Aftercare tips
To keep the joints looking good and working properly:
- Repaint timber before it’s bare
- Keep solvents and bleach off the sealant
- Keep jet washers away from the mastic
- Keep drainage slots and sill grooves clear
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
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.
Places near Canonbury
What else we do in Canonbury
What we cannot put right
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Damp problems in the wall away from the window
- Worn gaskets, brush seals or a door that has dropped
- Condensation trapped between the panes
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Joints and surfaces we work on
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Composite doors
- Window sills
- uPVC windows
The process
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours for a few frames, or a day or more for a whole house. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Canonbury. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
Getting 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 email pictures if that’s easy.