Greater London · England
Canonbury Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Canonbury, backed by a 12-month guarantee. Ask us for a quote.
- Old sand mastic that has cracked, crumbled or fallen out
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
Sand mastic in Canonbury
Sand mastic doesn’t last for ever and gaps open up round the frame. Renewing it closes the gap and tidies the surround. Common call-outs are for mastic round period door frames that has failed and wind and rain getting in round a sash window, on sash and case windows, period & listed homes and timber door frames.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or send us an email.
- Place
- Canonbury (N1, N1P, E8)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. Expect the work to take a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Canonbury. It helps if you can point us to a visitor permit or a bay close to the door.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Clear items away from the joints we are working on
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
Ask for a quote
For a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before we start.
Read more
Windows and doors in Canonbury
Compared with the north and west, the South East gets less rain, 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 check that before you book.
As a London address, Canonbury can be tricky for parking: let us know about parking bays, permits or a driveway. In the older streets around St Paul's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Canonbury is about 2 miles north-east of St Pancras, in Greater London. Our applicators cover sand mastic for homes and businesses in Canonbury and the surrounding area, as part of our work across Greater London. Canonbury is one of 764 places in Greater London where we work.
We work across N1, N1P and E8 for sand mastic. That includes homes and businesses on Dove Road, Essex Road and Clare Lane. You will find Canonbury on the A1199 and A1200, so it’s easy for us to get to. Close by, we work in 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). Larger places within reach include 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).
Landmarks near Canonbury
In Canonbury, that means homes and buildings near Bishopsgate Institute Special Collections and Archives, City of London Academy Highbury Grove and Islington Green School and the streets around them. You will also find New Crown pub (within half a mile north-west) and Shoreditch Park (0.6 miles south). There’s a railway station in Canonbury itself: Canonbury station. A little further out are 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.
Questions from Canonbury
Do you cover Canonbury for sand mastic?
Yes, Canonbury is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
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 bay close to the door helps a lot, so mention what’s available when you book.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Is consent needed for window work on a listed home?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like but the decision is theirs.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected.
How do I get a quote for sand mastic in Canonbury?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Is sand mastic better than silicone for my windows?
We will talk it through with you. Sand mastic suits many period homes and newer frames suit modern sealant.
Can I paint the new mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Why it’s worth doing now in Canonbury
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why book with us
- Full insurance on every job
- Sanitary silicone with an anti-fungal additive in wet areas
- Rated 4.9 stars on Google
- Every job guaranteed for a year
Read our cost guide or customer reviews.
Also near Canonbury
What else we do in Canonbury
When to call us in Canonbury
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Common reasons people contact us include:
- Cracked mastic round a front door frame
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Open joints round the window box
If you let a flat or house near Canonbury station, any sash windows need sound mastic to keep draughts and rain out.
Questions to ask before booking
- Is the old sealant removed completely?
- Whether they’re fully insured
- Whether you can choose the colour
- What happens if the job turns out different
What the job involves on each surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
What affects the quote in Canonbury
Every job gets its own quote. These are the things that affect it:
- Which sealant suits the joint
- The number and length of the joints
- Access and height
- Whether old sealant or filler has to be cut out
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
To make quoting easier, please include:
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
For sand mastic in Canonbury, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Aftercare tips
Looking after new joints is easy:
- Take care around the mastic when scraping paint
- Keep modern sealant off the mastic
- Ask us before painting near the mastic
- Have rotten timber repaired before new mastic goes in
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Can I do it myself?
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 doesn’t work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.