Mastic sealant contractors in Hackney
Mastic sealing for building owners, managing agents and housing associations across Hackney, by CSCS-carded applicators. CHAS accredited and fully insured.
- Repeated reactive repairs to the same buildings
- Damaged joints in communal entrances and corridors
- Draughts at frames across a block
Need mastic sealing in Hackney?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Common problems we fix in Hackney
Previous repairs often sealed new mastic over old. New sealant won’t grip failed sealant, so these repairs rarely last.
Look out for the following:
- Draughts at frames across a block
- Damaged joints in communal entrances and corridors
- Window mastic that has split and shrunk
- Open joints in brickwork or panels
Landlords with units on estates such as Bayford Street Industrial Centre, 0.5 miles to the south-west of Hackney, can bring frame, door and external mastic across several units into one programme.
What to look for in a quote
- The terms of the workmanship guarantee
- The named product and why it was chosen
- Health and safety accreditation such as CHAS
- Will RAMS and insurance details be available?
Mastic sealing in Hackney, done properly
Our clients include managing agents, property factors in Scotland, housing associations and landlords with block or commercial portfolios. Many prefer a planned programme to one-off visits and we quote and schedule each building in turn. We work on window and door perimeters on blocks, communal entrances and stairwells and balcony and threshold joints, and what we are called in for most is water getting in round frames after rain and worn sealant at communal door frames. A specialist sealant contractor works differently from a general builder: on jobs in Hackney, preparation and product choice get the time they need.
In a London area such as Hackney, many buildings are blocks of flats or mixed-use buildings run by managing agents, landlords or housing associations. Mastic around windows, doors and balconies tends to fail across a whole block at a similar time.
Every job is signed off with a 12-month guarantee. It’s a plain promise: if our work fails within that year, we put it right.
- Place
- Hackney (E9, E8, E3, E5)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Different surfaces, different methods
Tenement and older buildings
Older mastic can contain asbestos and the register is checked before anything is disturbed. Suspect material is tested before work continues.
Communal areas
Entrance doors, screens and corridor junctions in communal areas all have sealant joints. Tidy, sound joints keep them looking cared for.
What happens if it’s left?
Looking at mastic during planned maintenance costs little. Leaving it until there’s a leak turns it into reactive work and less choice about when. Access in London is hard enough to arrange once, so it makes sense to deal with every failing joint while access is in place.
Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. A fixed quote follows once we understand the job.
Why appoint us
- Joints cleaned back to sound surfaces
- Standard and matched colours in many product ranges
- Constructionline member for supplier checks
- Work carried out by CSCS-carded applicators
Take a look at what affects the cost and our accreditations.
Towns and villages near Hackney
Other services in Hackney
Mastic sealing around Hackney: how the place shapes the job
There are 16 care or nursing homes within about 2 miles of Hackney. Care home owners need frame and external mastic kept sound without unsettling residents. In London, mastic work on a block goes through the managing agent or landlord, with notice to residents. We work to your notice and access plan.
If you look after a block within reach of Homerton station, under half a mile to the north-east of Hackney, frame and balcony mastic can be renewed on one programme. Student blocks close to universities like Loughborough University London, 1 mile east of Hackney, are easiest to work on between tenancies.
Hackney is about 4 miles north-east of London, in Greater London. We cover commercial sites throughout Hackney, whether it’s a single job or part of a planned programme. Hackney is one of 764 places we cover in Greater London.
Postcode districts covered here: E9, E8, E3 and E5. Buildings on Homerton High Street, Primrose Square and St John's Church Road are within our area. Hackney sits on or close to the A107 and B113, useful when we plan access and materials. Sites close to Hackney are covered too, including Homerton (1 mile north), Lower Clapton (1 mile north), Hackney Central (1 mile west), London Fields (1 mile south-west) and Cambridge Heath (1 mile south-west). Nearby towns on our patch include London (4 miles south-west), City of Westminster (5 miles south-west), Marylebone (5 miles south-west), Kensington (7 miles south-west), St Pancras (3 miles west) and Walthamstow (3 miles north).
Near you in Hackney
In Hackney, that means premises near The Urswick School, Clapton Park and Chesham Arms and the streets around them. There’s a railway station in Hackney itself: Homerton station. Well-known places in the area include Hackney Walk (under half a mile north-west) and Cell Project Space (0.9 miles south-west). Open spaces near Hackney include Tower Hill and Old Ford Island.
Our process
We begin with a short walk round with whoever looks after the building, 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. In Hackney, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- First we look at the mastic on each building and note what needs replacing.
- You get a fixed quote, priced per building where that helps your budgeting.
- The sequence and the dates are fixed with you, giving you what you need to notify occupiers.
- We remove the old mastic completely and clean the joint faces back.
- Backing rod and primer go in as the joint requires, then the new bead is placed and tooled.
- Each building is checked on completion and the work carries our 12-month guarantee.
Getting the site ready
- Share your working hours and any access restrictions
- Send any specification or drawings in advance
- Agree which areas must stay open
Quotes
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price against exactly what is specified. For smaller jobs, photos and a description will do.
Advice
General trades versus a specialist
Certain joints really need a specialist: for instance fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.
Redoing a failed joint typically costs more than getting it right at the outset, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.
When it isn’t the sealant
Some faults sit outside our scope, and we point that out rather than sealing over them:
- Leaks through the frame itself rather than the perimeter
- Old mastic suspected of containing asbestos, which must be tested and dealt with by a specialist first
- Roof leaks, gutters or failed flashings that aren’t sealant joints
Not sure which it is? You can call the office on 01277 525 020 or use the quote form and we will tell you honestly before you book.
What we seal
- Communal entrances and stairwells
- Window and door perimeters on blocks
- Communal kitchens and washrooms
- External wall and movement joints
- Balcony and threshold joints
- Shopfronts below residential blocks
Questions we’re asked in Hackney
Do you cover business parks and estates near Hackney, such as Bayford Street Industrial Centre?
Yes. We cover Hackney and the area around it, including industrial estates, business parks and retail parks such as Bayford Street Industrial Centre. Photos and a short description are enough for a first look.
Do you work in London buildings with loading restrictions?
Yes. Inductions, permits and timed loading are routine for us in London. The building manager’s rules go straight into our method. All of Greater London is inside the ULEZ, and our planning allows for it
Can you follow the specification on our project?
Yes. Send it with your enquiry, and we’ll price the work to it, flagging anything that needs clarifying.
How long do sealant joints last?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
What paperwork can you provide?
Let us know your requirements: tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote. We hold CHAS accreditation and Constructionline membership.
Do you seal on top of existing sealant?
No. Overlaying old sealant is a frequent cause of early failure, so it all comes out first.
What if the old mastic contains asbestos?
Some mastics in pre-2000 buildings contain asbestos. We ask for the asbestos register or survey before work starts, and if it’s suspected, work stops until it’s tested.