Greater London · England

Mastic man in Islington

Careful resealing and window mastic for Islington’s period squares, converted flats and council blocks, from Clerkenwell and Angel up to Archway and Highgate.

  • Fully insured
  • Arbo and Everbuild sealants
  • Clear quote before we start

Resealing in Islington? Call for a quick quote

Your local mastic man for Islington

Islington packs more homes into each square mile than any other local authority in England and Wales, and that density shapes almost every sealant job here. Bathrooms sit above other people’s ceilings, kitchens are squeezed into narrow rear rooms, and windows face straight onto busy streets. Mr Mastic travels up from our base in Crawley to cover the whole borough, from Clerkenwell, Finsbury and Angel to Highbury, Holloway, Tufnell Park and Archway.

The work itself is simple to describe and fussy to do well. We cut out tired or mouldy silicone, clean and dry the joint properly, and run a new bead that suits the surface and the movement it has to cope with. Baths, showers, basins, kitchen worktops, window frames and door thresholds all get the same care. We never lay fresh sealant over old, because it simply peels away within months, and we tell you exactly what we found before any work starts.

Early 19th-century squares, Victorian streets and large estates

Much of Islington was built as a suburb of the City in the early 1800s. Canonbury was laid out from 1803, and Canonbury Square went up between 1805 and 1830; Barnsbury’s squares and terraces followed as the fields filled in. Further north, Holloway and the streets around St Mary Magdalen are lined with Victorian terraces. These houses have tall timber sash windows, solid brick walls and bathrooms that were added long after they were built, often on timber floors that flex with every step.

Old sash boxes usually need a mastic that can take the timber’s seasonal swelling, and in some cases traditional sand mastic is the right choice; our guide to sand mastic on sash and case windows explains when. Inside, a bath on a springy floor will tear a rigid bead, so we fill the bath before sealing and use a flexible sanitary silicone.

The borough also has a large stock of council and housing association homes. The Marquess Estate in Canonbury, finished in 1976 with around 1,200 dwellings in dark red brick, is one example among many blocks across the borough. Here the jobs tend to be repeat ones: shower trays, bath panels and window reveals where condensation has turned old sealant black.

Mr Mastic applicator sealing the top of a white uPVC door frame on a red-brick house
Mr Mastic applicator sealing the top of a white uPVC door frame on a red-brick house
Map of Islington © OpenStreetMap contributors

Working in conversions, conservation areas and blocks

Islington has 42 conservation areas, including Barnsbury, Canonbury and Clerkenwell, so many front elevations are protected. We match the colour and finish of external mastic to the frame and keep the bead neat, so the work sits quietly on a period front rather than standing out. Inside a converted house, the main worry is the flat below: a failed seal at the end of a bath can drip through a ceiling for weeks before anyone notices. We look for signs of past leaks, check the tray or bath is solid, and point out anything that needs a plumber before we seal.

Parking is controlled on many streets and the southern part sits in the congestion charge zone, so tell us about permits, loading bays and building access when you book. In blocks, a note from the managing agent about entry codes or lift use saves time on the day.

Universities, healthcare and offices near the City

The south of the borough borders the City of London, and Clerkenwell, Farringdon and Old Street are full of offices, studios and restaurants with busy washrooms and kitchens. Higher education is here too: City St George’s, University of London, at Northampton Square and London Metropolitan University’s campus on Holloway Road. Moorfields Eye Hospital and the Whittington Hospital at Archway bring surgeries, clinics and care settings nearby, where hygienic, anti-bacterial joints matter; see our healthcare sealant page.

Islington also has a big private rented sector. We reseal for landlords and letting agents between tenancies; our landlord sealant service explains how we handle keys, access and several properties at once.

How a job runs

  1. Call or email. Tell us what needs doing, where it is and anything about access. Photos by email help.
  2. Quote and booking. We quote clearly before anything starts and fix a day that works for you.
  3. Cut out and prepare. All the old sealant comes out, and the joints are cleaned, treated and dried.
  4. Lay the new bead. We apply the right product for each joint and tool it to a clean, even line.
  5. Cure and guarantee. We tell you when it can be used, and every job has our one-year guarantee.

Jobs we take on in Islington

  • Bathroom & kitchen resealing: Mouldy or split sealant around baths, shower trays, basins and sinks removed completely and replaced with a neat, hygienic bead.
  • Window & door mastic: Cracked or shrunken mastic around window and door frames, sills and patio doors replaced with a weatherproof sealant.
  • Commercial & hotel sealant: Hotels, offices, washrooms and welfare areas resealed room by room, with out-of-hours working possible to arrange.
  • Remedial sealant & repairs: Leaks and lifting beads from earlier sealant jobs put right, starting with finding out why they failed.
  • Fire-rated sealant: Fire-rated sealant for service penetrations and frame gaps where it has been specified, applied to the tested details.
  • External & façade joints: Split or perished joints in walls and cladding replaced with exterior sealant designed to stretch with the building.
  • New-build mastic & snagging: Snagging sealant for new homes and plot-by-plot mastic for builders and developers.
  • Floor & skirting joints: Gaps under skirting boards, tile movement joints and concrete floor joints sealed with a product that suits the traffic.
  • Regrouting: Cracked, stained or crumbling grout raked out and replaced, with corners resealed in silicone.
  • Glazing & conservatory sealant: Leaking conservatory and rooflight joints, glass panels and shower screens resealed with silicone made for glass.
  • Gutter, fascia & soffit sealing: Leaking gutter joints, end caps, fascia and soffit joints resealed with exterior sealant.
  • Sand mastic for sash & case windows: Sash and case window surrounds in stone and brick re-pointed with traditional sand mastic.

Choosing a mastic man in Islington

Old houses and tight flats leave little room for a rushed job, which is why experience counts here. Mr Mastic has over 20 years in the trade, more than 2,847 completed projects and ARBOMaster approved applicator status, and we work with Arbo and Everbuild sealants chosen for each joint. We are fully insured, which matters when you share walls and ceilings with neighbours. Our 4.9-star Google rating comes from 180+ five-star reviews. Before we begin you get a clear quote, and once we finish, a one-year guarantee.

Around Islington

The nearest station to the town centre is Essex Road station. Places most people will know nearby are Brunswick Centre (1.3 miles south-west), Queer Britain (0.8 miles west) and Montfichet's Tower (1.7 miles south). Closer in, we work on homes, rented flats and businesses near St Mary's CofE Primary School, Islington Proprietary School, Islington Green School and St Mary's Church. Green spaces within reach include Barnsbury Wood and Ludgate Hill.

What customers say

Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.

★★★★★
“New build in Forge Wood — shower seal had failed after 16 months. Mr Mastic came out quickly, removed everything and did it properly. Perfect finish and no more leaks.”
Anna P., Forge Wood, Crawley
★★★★★
“Harper Drive in Maidenbower — kitchen worktop had been leaking behind for a while. Came out the next day, sorted it properly. Really tidy job.”
Sarah K., Harper Drive, Maidenbower
★★★★★
“Called for a bathroom reseal and the mastic man showed up on time with all the right equipment. Brilliant attention to detail. The sealant looks perfect and they kept everything tidy.”
Sarah Elizabeth, Essex
20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job

Islington: common questions

Do you cover all of Islington?

Yes. We work right across the borough, including Clerkenwell, Finsbury, Angel, Barnsbury, Canonbury, Highbury, Holloway, Tufnell Park, Archway and the Islington side of Highgate and Finsbury Park.

Can you seal around sash windows in a conservation area?

Yes. We remove the failed mastic and use a flexible sealant, or sand mastic where it suits the frame, in a colour that matches the existing paintwork.

My bath leaks into the flat below. Can resealing fix it?

Often, if the leak is at the seal. We check the joint and the bath first, and if the problem is a pipe or waste we’ll tell you so a plumber can fix it before we reseal.

Why does the sealant in my converted flat keep cracking?

Many conversions have baths and showers on timber floors that move. We fill the bath before sealing and use a flexible sanitary silicone so the bead can move without splitting.

Do you work in council and housing association blocks?

Yes. We reseal bathrooms and kitchens in blocks across the borough and can work with managing agents on access.

Is parking a problem for an Islington visit?

Most streets have controlled parking, so please let us know about permits, bays or a driveway when you book.

Can you work in offices or restaurants out of hours?

Out-of-hours working can be arranged for commercial jobs so washrooms and kitchens are back in use quickly.

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