Greater London · England
Mastic man in Hackney
Shower, bath and window resealing for Hackney’s terraces, canal-side flats and new blocks, from Shoreditch and Dalston to Clapton and Stamford Hill.
- Fully insured
- Arbo and Everbuild sealants
- Clear quote before we start
Your local mastic man for Hackney
Few London boroughs mix building types quite like Hackney. A single street can hold a Georgian terrace, a 1930s council block, a converted warehouse and a glass-fronted new build, and each needs its sealant handled a little differently. We cover the whole borough from our base in Crawley, resealing bathrooms and kitchens, renewing window and door mastic and sealing the joints that keep weather out.
Every job starts the same way: the old silicone comes out completely, the joint is cleaned and dried, and only then does the new bead go on. If the shower has been leaking for a while, we check for soft grout, loose tiles or a moving tray first, because sealing over a problem only hides it. If you’ve had a shower resealed before and it failed quickly, that’s usually why.
Terraces, council estates, warehouses and regeneration
Large parts of Hackney are Georgian and Victorian terraces, many protected by the borough’s 35 conservation areas, which include De Beauvoir, Clapton Square, Stoke Newington, Victoria Park and Broadway Market. De Beauvoir Town was laid out in the 1820s and 1840s around De Beauvoir Square, while South Hackney near Victoria Park has Georgian, Victorian and Edwardian terraces. Most have sash or bay windows and bathrooms that have been rebuilt several times.
Hackney also has a long history of council housing, from interwar estates such as Kingsmead and Morningside to post-war blocks and the De Beauvoir Estate of the late 1960s. In these flats, condensation and small, poorly ventilated bathrooms are the usual cause of black mould creeping along the bath and window seals.
Then there are the newest homes. Woodberry Down, beside the reservoirs near Manor House, is being rebuilt with more than 5,500 new homes, and warehouses in Hackney Wick and Shoreditch have become flats. New buildings dry out and settle in their first year or two, and developer sealant often cracks; our new build sealant snagging guide covers what to look for.

Flats above flats, canals and controlled streets
So many Hackney homes are flats that a failed seal is rarely just your problem. Water escaping at the end of a bath or under a shower screen soaks into the floor and shows up on a neighbour’s ceiling, so we take extra care with the corners and the tap end, where most leaks start. In new blocks, we often seal around large aluminium-framed windows and balcony doors, where a deep gap needs backing rod and a weatherproof sealant that can move with the frame.
Homes along the Regent’s Canal and the River Lea tend to sit in more exposed, damp air, which is hard on external mastic and on bathrooms with poor ventilation. Most of the borough has controlled parking, so let us know about permits, building access and any concierge desk when you book.
Shoreditch offices, Hackney Wick workspaces and restaurants
The Hackney side of Shoreditch, around Old Street, is full of offices in converted industrial buildings and newer towers on the edge of the City, each with washrooms, showers and tea points that see heavy daily use. Hackney Wick still has light industry alongside studios and workspaces. Our commercial sealant work covers washrooms, kitchens, glazing and movement joints.
The borough’s bars, cafés and restaurants, from Broadway Market to Dalston, need hygienic seals around sinks, worktops and food prep areas; see sealant for restaurants. Homerton University Hospital is also here, and we work for landlords and letting agents across the borough.
How a job runs
- Tell us about the job. A quick call or email with what needs sealing and where. Photos help us quote accurately.
- Get a clear quote. We give you a clear price before any work starts, and agree a date with you.
- Cut out and prepare. All the old sealant comes out, and the joints are cleaned, treated and dried.
- Lay the new bead. We apply the right product for each joint and tool it to a clean, even line.
- Leave it to cure. We tell you how long to leave it before use, and the work carries our one-year guarantee.
What we do in Hackney
- Bathroom & kitchen resealing: Every joint in the bathroom and kitchen, from the bath edge to the worktop, stripped back and resealed with anti-fungal silicone.
- Window & door mastic: Frame perimeters inside and out resealed with flexible, colour-matched sealant, with backing rod where the gap is deep.
- Commercial & hotel sealant: Sealant programmes for offices, hotels, care settings and schools, with early or late working where it helps.
- Remedial sealant & repairs: Failed, botched or over-sealed joints stripped out, the cause found and the joint resealed properly.
- Fire-rated sealant: Fire-rated and intumescent sealant around gaps, frames and service penetrations, to the product’s tested details.
- External & façade joints: Outside movement joints given new backing rod and a flexible, weatherproof sealant in a colour to match the wall.
- New-build mastic & snagging: Early-failing sealant in new homes fixed properly, plus mastic packages and snagging for developers.
- Floor & skirting joints: Floor and skirting joints in homes, shops and warehouses sealed neatly and to the right depth.
- Regrouting: Shower and splashback grout replaced where it has cracked or stained, with silicone in the movement joints.
- Glazing & conservatory sealant: Leaking conservatory and rooflight joints, glass panels and shower screens resealed with silicone made for glass.
- Gutter, fascia & soffit sealing: Exterior joints at gutters, fascias and soffits resealed to stop drips and staining down the wall.
- Sand mastic for sash & case windows: Old sand mastic around sash windows and doors raked out and renewed with traditional burnt sand mastic.
Why Mr Mastic in Hackney
Hackney homes range from 1820s squares to buildings finished last year, so the right sealant varies from job to job. That’s where our 20+ years come in. As an ARBOMaster approved applicator using Arbo and Everbuild products, we pick the sealant for the joint rather than reaching for one tube for everything. We’re fully insured, we’ve completed more than 2,847 projects, and 180+ customers have left five-star reviews for a 4.9-star Google rating. Expect a clear quote first and a one-year guarantee afterwards.
Landmarks near Hackney
From the centre, the nearest railway station is Homerton station. Places most people will know nearby are Hackney Walk (less than half a mile north-west), Cell Project Space (0.9 miles south-west) and Tower of London (2.8 miles south-west). Around the centre, our work takes us to homes, rentals and businesses close to Berger Primary School, Cardinal Pole Catholic School, The Urswick School and Church of St Luke. Green spaces within reach include Old Ford Island and Tower Hill.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“Harper Drive in Maidenbower — kitchen worktop had been leaking behind for a while. Came out the next day, sorted it properly. Really tidy job.”
“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.”
“We had old mastic that needed replacing throughout our kitchen and bathrooms. The mastic man professional was knowledgeable, quoted fairly, and delivered excellent quality work. Highly recommend!”
Areas of Hackney we cover
Find your area below, or call 07833 053749 or email us with your postcode and a few details.
- Bethnal Green
- Bow
- Bromley-by-Bow
- Cambridge Heath
- Canonbury
- Clapton
- Dalston
- De Beauvoir Town
- Donnybrook Quarter
- East Village
- Fish Island
- Hackney Central
- Hackney Marshes
- Hackney Wick
- Haggerston
- Homerton
- Hoxton
- Kingsland
- Lea Bridge
- Leyton Grange
- London Fields
- Lower Clapton
- Maryland
- Mildmay
- Mile End
- Newington Green
- Old Ford
- Shacklewell
- Shoreditch
- Stepney
- Stratford
- Temple Mills
- Upper Clapton
- West Hackney
Also near Hackney
Questions we’re asked in Hackney
Do you cover all of Hackney?
Yes. We cover Shoreditch, Hoxton, Haggerston, De Beauvoir Town, Dalston, Hackney Central, Homerton, Hackney Wick, Clapton, Stoke Newington, Stamford Hill and Woodberry Down.
The sealant in my new Woodberry Down flat is already cracking. Is that normal?
It’s common in new buildings as they dry out and settle. We remove the developer sealant, prime where needed and reseal with a flexible product.
Can you reseal in a warehouse conversion?
Yes. We often seal around large windows, metal frames and shower enclosures in converted buildings, using a sealant suited to each surface.
Why does mould keep coming back on my bath seal?
Usually because of condensation and poor ventilation. We use anti-fungal silicone, and better airflow after a bath helps it stay clean much longer.
Do you work for Hackney landlords?
Yes. We reseal between tenancies and when tenants report leaks or mould, and can quote for several flats at once.
Can you work in a restaurant kitchen out of hours?
Out-of-hours working can be arranged so sinks and prep areas are resealed and cured before service.
How should I tell you about access?
Let us know about parking permits, entry codes, lifts and concierge desks when you book, so the visit runs smoothly.
