Greater London · England
Islington New Build Mastic
Professional new build mastic in and around Islington, with every bit of old sealant taken out first and a 12-month guarantee.
- Messy sealant that spoils new finishes
- Cracked caulk along new skirting
- Internal frame sealant that has split
For landlords and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
New build mastic in Islington, done properly
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, so sealant that was laid quickly before handover often cracks. If you have frame joints opening as the plaster dries and leaking shower tray seals in a new home, we can help.
New flats are going up across London, many of them in larger developments. Snagging there often goes through the developer or managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Where
- Islington (N1, N7, NW1, EC1V)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
New homes and floors in Islington
Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, Islington can be tricky for parking: let us know about parking bays, permits or a driveway.
Islington is about 3 miles north-east of City of Westminster, in Greater London. Every kind of property in Islington can book us for new build mastic, old or new, large or small. The work is guaranteed for a year. Islington is one of 764 places in Greater London we cover.
Every address in N1, N7, NW1 and EC1V is covered for new build mastic. We cover properties on Gibson Square, Old Royal Free Square and Cloudesley Square and the roads around them. Being close to the B515 and A5203, Islington is easy for our applicators to reach. Neighbouring places we cover for new build mastic include 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 out, we also cover 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).
Near you in Islington
Around Islington, our work takes us to homes and buildings near Islington Green School, The King's Head Public House and Pilsudski Institute of London, among other places. Nearby too are Barnard Park (under half a mile south-west) and St Mary's CofE Primary School (within half a mile east). Islington has its own railway station: Essex Road station. Nearby you will also find King's College Hospital Charity (0.7 miles north-west) and Montfichet's Tower (1.7 miles south). The countryside around Islington includes Barnsbury Wood and Ludgate Hill.
Common problems we fix in Islington
If plaster or screed was still damp when it was sealed, the bond suffers. On a busy site, joints aren’t always given time to dry before the sealant goes on.
It’s worth asking for a quote if you see:
- Skirting joints opening in the first winter
- Gaps opening as the house dries out and settles
- Beads laid onto grit and dust from the build
- Kitchen sealant that has pulled off the wall
If you’ve bought a new home near Essex Road station, the sealant around baths, showers and frames is worth checking in the first year or two.
What your quote should include
- Whether they seal over old material or remove it
- What product goes in the joint
- Are they insured?
- Who turns up on the day
What happens on the day
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the number of plots. In a London area like Islington, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely down to clean surfaces.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we’re working on
- Tell us if parking is tricky
How to get a quote
Asking for a quote is easy: let us know the job and the location and its rough size. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Advice
Common questions in Islington
Can you help a landlord with a rental near Essex Road station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Can parking be tricky for a visit in Islington?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Should I try DIY first?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
What does new build mastic cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Is it messy?
We keep the work tidy. We protect what’s around the joints.
How long will you be here?
Typically it takes a few hours for most snagging lists, longer for a run of plots. Bigger jobs take longer, and we will tell you how long to expect.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Do you take on second-fix sealing for builders?
Yes. Plot mastic and second-fix sealing for developers is part of our work. Send the schedule and any specification and we will give you a quote.
When it is not the sealant
A few problems are outside what sealant work can do:
- Settlement cracks that need a surveyor
- Baths and trays that move too much for sealant to cope with
- Damaged fittings that need replacing
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- Skirting & floors
- Bathrooms & en suites
- Show homes
- Kitchens
- Plot handovers
- Windows & doors
How the job changes by surface
Windows and doors
A draught at a new window can be a missed or failed joint. We look at the joints and reseal where needed.
Bathrooms and en suites
Shower trays in new homes often move slightly in the first year. The joint is stripped back before the new bead goes in with baths filled first.
Nearby places to Islington
Also in Islington
DIY versus a professional finish
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Resist patching a failed seal with a tube from the DIY shop
- Wait for the cure time before using a resealed shower
- Avoid scourers and strong chemicals on sealant
- Put sealant faults on your snagging list early
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents.
Report failed sealant to the builder while you are in the snagging period. Once it ends, the repair may be down to you so report it promptly.