Mastic Sealing in Islington
We carry out mastic sealing for building owners, managing agents and housing associations in Islington and the surrounding area. Send details for a fixed quote.
- Communal area joints that look neglected
- Draughts at frames across a block
- Estate-wide sealant that is simply worn out
Mastic sealing in Islington
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Our process
When we get to site, we sign in, go through any site induction and check how permits are handled. Everything around the joints gets protected before anything is cut or cleaned, and the work usually takes anything from a day to a few weeks, depending on the number of buildings and joints. For a job in Islington, access comes first. Give us the hours we can be on site and we will schedule to suit.
- A building-by-building inspection lists the failed joints.
- You get a fixed quote, per block or for the whole programme.
- We agree the programme and dates with you.
- Failed sealant is removed and the faces prepared.
- New sealant goes in with backing rod and primer where needed.
- Each building is checked and signed off with the 12-month guarantee.
Preparing the site
- Send asbestos survey details if the building is pre-2000
- Tell us your opening times and when work is allowed
- Explain the parking and delivery arrangements
Ask for a quote
Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we will fill any gaps with a visit.
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Mastic sealing for commercial buildings in Islington
For blocks and buildings in Islington and across Greater London, the process is the same: send details, get a fixed quote, we seal, and the work is guaranteed. Addresses, photographs of typical joints and a rough idea of quantities let us give a quick quote or we can visit. We work on window and door perimeters on blocks, communal kitchens and washrooms and balcony and threshold joints, and what we’re called in for most is occupiers reporting cold air round windows and window mastic that has split and shrunk. Most enquiries from Islington start with one failed joint and grow into a wider look at the building: we look at the rest while we’re there and tell you what we find.
London’s ULEZ covers every borough, and parking and loading rules vary street by street. For a block or estate, it helps to know where we can park and stage materials.
Whoever the client is, the cover is the same: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Place
- Islington (N1, N7, NW1, EC1V)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Planned mastic for Islington portfolios
For a London block, the agent or landlord normally handles notices to residents and access to flats. We plan around the notices and access you arrange. The 2 miles around Islington include four care or nursing homes. Frame mastic on care buildings is best renewed elevation by elevation, with the manager deciding timings.
Student blocks close to universities like Paris Dauphine University - London Campus, 0.5 miles to the south of Islington, are easiest to work on between tenancies. For agents with blocks near Essex Road station, under half a mile to the east of Islington, a block-wide mastic programme deals with frames, balconies and entrances in one go.
Islington is about 3 miles north-east of City of Westminster, in Greater London. Looking for mastic sealing in Islington? We can help. Across Greater London, 764 places are covered, including Islington.
Business premises anywhere in N1, N7, NW1 and EC1V are within our area. Buildings on Gibson Square, Old Royal Free Square and Cloudesley Square are within our area. Being close to the B515 and A5203, Islington is straightforward for us to reach. If your building is just outside Islington, we cover Pentonville (1 mile south), Angel (1 mile south), Barnsbury (1 mile north-west), Clerkenwell (1 mile south) and Lower Holloway (1 mile north-west). Further afield, our area takes in London (3 miles south), City of Westminster (3 miles south-west), Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (3 miles west) and Ruislip (13 miles west).
Landmarks near Islington
Locally, jobs take us to sites close to Islington Green School, The King's Head Public House and Pilsudski Institute of London, among other places. Nearby too are Barnard Park (less than half a mile south-west) and St Mary's CofE Primary School (less than half a mile east). Islington has its own railway station: Essex Road station. A little further out are King's College Hospital Charity (0.7 miles north-west) and Montfichet's Tower (1.7 miles south). Not far away are Barnsbury Wood and Ludgate Hill.
Places near Islington
Also in Islington
What the job involves on each surface
Commercial and mixed-use buildings
Tenants in commercial buildings need to keep trading, so we plan around them.
External movement joints
Brickwork, blockwork and panel joints let a building move. Once that sealant goes, rain can reach the wall.
Should maintenance staff do it?
For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.
Commercial clients in Islington
For main contractors, we work as the sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first, and our applicators hold CSCS cards.
As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
Questions we are asked in Islington
Can you work in a care home near Islington with residents in?
Yes. We agree rooms and times with the manager and work a few areas at a time. Noise and disruption are kept to a minimum.
Will you take on a block within reach of Essex Road station?
Yes, and several blocks can go on one quote. Photos of each elevation help us quote accurately.
What about access for upper-floor joints?
Access is discussed and agreed before the quote is fixed. Tell us the building height and any access already in place and we’ll confirm the approach in the quote.
Do you check for asbestos in old sealant?
Some mastics in pre-2000 buildings contain asbestos. We check the asbestos register or survey before disturbing it and suspect material is tested first.
How long do sealant joints last?
There isn’t a single answer, since movement, weather, cleaning and use all affect it. Regular checks let you plan resealing before leaks or damage.
How long before the joints can be used?
Curing time varies by product, and we confirm it on the day, and flag anything to keep off until it has cured.
Does weather matter for sealant work?
Outside, yes. Sealant needs a dry joint and a temperature within the product’s range, so damp, frosty or very cold days can stop external work. Internal work is rarely affected.
Common problems we fix in Islington
Many failed joints were sealed without backing rod so the mastic is bonded on three sides. It can’t stretch properly and splits as the building moves.
If one of these sounds familiar, it’s time for a closer look:
- Repeated reactive repairs to the same buildings
- Communal area joints that look neglected
- Draughts at frames across a block
- Patchy repairs in mismatched sealant
Site managers at schools like Islington Proprietary School can fit frame mastic into the summer works.
Questions to ask before you book
- What site paperwork they can supply
- Will failed sealant be removed rather than covered?
- Will CSCS-carded applicators be on site?
- Can the work be phased to keep areas open?
Leave it or put it right?
Looking at mastic during planned maintenance costs little. Waiting until leaks appear means working under pressure with less control over timing. Repeat call-outs disrupt occupied London buildings, so a proper job first time, with the old sealant fully removed, is worth it.
Larger quantities, tricky access or phasing all shape the price. So do site requirements such as inductions and permits, along with the time of year for external work.
Why us?
- Our applicators hold CSCS cards
- Fully insured, including public liability cover
- RAL and finish matching where the product range allows
- One number for every site we cover
Read what affects the cost and our accreditations and insurance.