Hornsey construction mastic
We carry out mastic packages for new-build and refurbishment projects in Hornsey and the surrounding area. Send photos or drawings for a fixed quote.
- Snag items on joints that need redoing before handover
- Failed sealant in an existing building being refurbished
- Perimeter gaps outside the sealant’s range
Construction mastic in Hornsey
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Construction mastic for commercial buildings in Hornsey
A typical mastic package covers more than window perimeters: external door and window perimeters, internal decorators’ caulk where specified, sanitary joints in bathrooms and washrooms, kitchen worktops and splashbacks, and snagging before handover. One contractor for all of it keeps the responsibility in one place, and one applicator team gives a consistent finish. If you have failed sealant in an existing building being refurbished and missed perimeter joints on a new elevation, we can put it right, whatever the surface. Looking for mastic applicators who cover Hornsey? We’ve been sealing commercial buildings since 2005, with CSCS-carded applicators.
The ULEZ covers the whole of Greater London, so contractors’ vehicles on a job in Hornsey must meet its standards or pay the daily charge. Add booked delivery slots and limited storage, and a London mastic package needs planning before the first bead.
We sign every job off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.
- Where
- Hornsey (N8, N22)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Quote
- Quoted before any work starts
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Contractors’ notes for Hornsey
Hornsey has plenty of hotels close by, all within 2 miles. Hotel extensions and refits typically have to fit around bookings, so mastic dates are tight. As part of Greater London, Hornsey is inside the ULEZ, which applies to every van on site. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.
For contractors on a campus like American University in London, 1.9 miles south of Hornsey, facade and perimeter sealing has to fit around students and term dates. Projects at colleges like St. Giles College (to the south-west of Hornsey) tend to run to term dates, so the mastic is planned tightly.
Hornsey is about 3 miles east of Finchley, in Greater London. Across the N8 postcode area, the process is the same: send details, get a fixed quote, we seal, and the work is guaranteed. We work across 764 places in Greater London, large and small. Our London page has more on work in that area, about 6 miles away.
Anyone looking for construction mastic in N8 and N22 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. We cover commercial and managed buildings on High Street, Brandon Place and Cross Lane and the roads nearby. Nearby places we also cover include Turnpike Lane (1 mile east), Crouch End (1 mile south-west), Stroud Green (1 mile south-east), Wood Green (1 mile north-east) and Noel Park (1 mile north-east) for mastic packages. A short drive away, we cover London (6 miles south), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (7 miles south-west), St Pancras (4 miles south) and Shoreditch (5 miles south).
Near you in Hornsey
We work on buildings around Great Northern Railway pub, Priory Park and Greek Secondary School of London, among other places. Hornsey has its own railway station: Hornsey station. Well-known places in the area include Hornsey Central Hospital (0.7 miles west) and Broomfield House Museum (2 miles north). Open spaces near Hornsey include Darland's Lake and Highgate Hill.
More services for Hornsey
Do you need construction mastic in Hornsey?
Frames installed with uneven gaps make perimeter sealing harder. Sealant has a range of joint widths it can cope with, so gaps outside that range need sorting by the installer first. Better to raise it at the start than seal a joint that’s bound to fail.
Most enquiries start with one or more of the following:
- Frame gaps too wide for sealant alone
- Sealant knocked or painted over by other trades
- Different trades sealing to different standards
- Window and door perimeters that won’t pass inspection
Units on estates such as Arena Shopping Park (to the south-east of Hornsey) tend to be reclad and refitted as tenants change, and each job leaves cladding and perimeter joints to seal.
What to look for in a quote
- Are they CHAS accredited or on Constructionline?
- The terms of the workmanship guarantee
- Whether primer will be used where the manufacturer specifies it
- The named product and why it was chosen
What sets the cost
Before we quote, we look at:
- Backing rod, priming and other preparation
- The product specified
- How much existing material needs removing
- Working within restricted access windows
Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well, along with the time of year for external work.
Before you send an enquiry
There’s no need for a formal survey. These details are enough to start:
- How the joints are reached, and at what height
- Whether the building will be occupied during the work
- The postcode of the building
- Clear photos of the problem areas
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To start the process, call 01277 525 020 or email drawings and photos.
Questions we are asked in Hornsey
Can you cope with the access rules in a London building?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Send the building rules and access times with your enquiry. The ULEZ covers the whole of Greater London, which we allow for
Does your area include sites such as Arena Shopping Park, near Hornsey?
Yes. We cover Hornsey and the area around it, including industrial estates, business parks and retail parks such as Arena Shopping Park. Send details of the unit and the work through our quote form for a quick quote.
Will you come and look before quoting?
That depends on the size and complexity of the job. Straightforward work can often be priced from photos and measurements, and bigger or more complex jobs normally get a visit.
Does weather matter for sealant work?
It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so external work may be moved if conditions aren’t right. Internal work is far less affected.
What happens if old sealant might contain asbestos?
The duty to manage asbestos sits with the building’s dutyholder, so for older buildings we ask for the asbestos register first. If anything suspect turns up, we stop until it’s tested.
Do you cover Hornsey?
Yes. We take on work across Hornsey, with one number for every area we cover.
Can you work to our specification?
The specification decides the product. Product standards such as BS EN 15651 are often named in specifications.
What sealant work can’t fix
Honesty saves time and money. Fresh joints won’t solve:
- Defective windows, doors or glazing units (the supplier or installer’s job)
- Deciding which fire-stopping product a penetration needs
- Joints damaged after sign-off by following trades
Not sure which it is? You can give us a call on 01277 525 020 or email a schedule or drawings and we’ll tell you honestly before you book.
What we seal
- Brick and block movement joints
- Sanitary and kitchen joints
- Floor and skirting junctions
- Internal decorators’ caulk
- Window and door perimeters
- Cladding and panel joints
Our process
The first thing on site is a walk round with your contact, to confirm the scope, the order of work and any areas we must keep clear. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. For a job in Hornsey, access comes first. Give us the hours we can be on site and we will schedule to suit.
- We price from the drawings, specification and programme you send.
- We return a fixed quote that ties the mastic package to your programme.
- You tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we confirm it with the quote.
- We seal each plot or floor as it’s released to us.
- Joints are cleaned, primed where the maker requires it, backed and sealed to the specification.
- Before handover, snags are dealt with and the package is signed off under our 12-month guarantee.
What we need from you
- For older buildings, check the asbestos register before work
- Make sure the joints can be reached
- Flag any permit to work we’ll need
Request a quote
The quickest route to a quote is a few photographs and the site postcode. Upload them with the quote form, or phone 01277 525 020 or email a schedule or drawings to discuss it first.
Related advice
Aftercare for building managers
Regular inspection catches problems early. In particular:
- Use the product the specification names
- Allow flexibility for external sealing in damp or cold weather
- Ask installers to correct oversized gaps first
- Keep scrapers and abrasive pads off new beads
Our 12-month guarantee covers the workmanship from sign-off. The guarantee covers how we sealed, not later damage by other trades.
One unsealed frame can let water into finished internal areas. That normally means redoing finishes in a completed area and possibly a delayed handover. A check of every frame before decorators start is worth the time.
How the job changes by surface
Window and door perimeters
Gaps around frames have to be within the sealant’s range. We check them during the first walk-round and flag any that need packing or adjusting before sealing starts.
Bathrooms, en suites and washrooms
Across a block of flats or a hotel, sanitary sealing is repeated in every room. A single team keeps the standard consistent.