Greater London · England
Highbury Window Mastic
Window mastic across Highbury and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Rain getting in at the frame or under the sill
- Gaps left after new windows were fitted
- Draughts coming in around windows and doors
About our window mastic in Highbury
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We work on patio & French doors, aluminium frames and uPVC windows, and the jobs we see most are rain getting in at the frame or under the sill and gaps left after new windows were fitted.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Highbury as anywhere.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Highbury (N1, N16, N5)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
When it is not the sealant
New sealant cannot fix everything, and we’d rather say so up front. Sealant will not put right:
- A frame that has rotted at the joint
- Damp coming through the wall itself rather than the frame joint
- A failed sealed unit that has misted up
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Surfaces we seal
- Composite doors
- Window sills
- Patio & French doors
- uPVC windows
- Aluminium frames
- Timber windows & doors
The process
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a few frames, or a day or more for a whole house. In Highbury, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Let us know if you’ve seen damp or leaks
- Let us know about stairs, lifts or work at height
- Plan for the work area to be out of bounds to pets and children
Getting a quote
For a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Read more
What affects the quote in Highbury
Call for a quick quote. What matters most is:
- The product the joint needs
- How easy the joints are to reach
- The number and length of the joints
- Whether old sealant or filler has to be cut out
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
To help us quote quickly, please include:
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- How we’d reach the joints
- Any previous sealing or DIY work
For window mastic in Highbury, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured.
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Do you need window mastic in Highbury?
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Any of these means the joints need attention:
- White mastic on grey or black frames
- Rushed sealant from a window installation
- Draughty joints inside around the window
- Draughts coming in around windows and doors
If you let a flat or house near Canonbury station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Questions to ask before you book
- What product goes in the joint
- What the quote includes, VAT included or not
- How hidden problems are handled
- How long the guarantee is
What window mastic looks like in Highbury
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Sutton House (about 2 miles east) are a reminder that the area around Highbury has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as Christ Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Highbury Quadrant Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Highbury is about 4 miles north-east of City of Westminster, in Greater London. Our applicators cover window mastic for homeowners, landlords and businesses in Highbury and the surrounding area, as part of our work across Greater London. Highbury is one of 764 places in Greater London we cover for window mastic.
Our applicators cover all of the N1, N16 and N5 postcode area for window mastic. Whether your property is on Prah Road, Dove Road and Lough Road or a nearby road, we can help. You’ll find Highbury on the A1199, which makes it straightforward to reach. Neighbouring places we cover for window mastic include Newington Green (1 mile east), Mildmay (1 mile east), Canonbury (1 mile south-east), De Beauvoir Town (1 mile south-east) and Stoke Newington (1 mile north-east). Further out, we also cover London (4 miles south), City of Westminster (4 miles south-west), Marylebone (3 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Whitechapel (3 miles south-east).
Near you in Highbury
In Highbury, that means homes and buildings near Highbury Fields, Musical Theatre Academy and The Snooty Fox pub and the streets around them. Highbury has its own railway station: Canonbury station. A little further out are Arsenal Football Club Museum (0.6 miles north-west) and Montfichet's Tower (2.7 miles south). Open spaces near Highbury include Gillespie Park and Dartmouth Park Hill.
Surface by surface
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
Patio & French doors
Door frames take knocks and movement every time the doors are used. The sealant must cope with it without cracking.
Highbury: your questions answered
Is parking an issue for window mastic in Highbury?
In much of London, parking needs 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 Canonbury station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Will new mastic stop draughts?
Yes, where the draught is at the frame edge. We check where the draught is before work begins.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
What does window mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, ring 0345 464 0079 or email us with a short description of the job.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
Towns and villages near Highbury
What else we do in Highbury
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.