Greater London · England
New Build Mastic in Finsbury
Our applicators work in Finsbury on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Untidy sealant flagged on a snagging list
- Cracked sealant around new window and door frames
- Kitchen sealant that has pulled off the wall
Your questions about new build mastic in Finsbury
Is Finsbury in your area for new build mastic?
Yes. Our work covers London and the South East, and Finsbury is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Can parking be tricky for a visit in Finsbury?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Is the work guaranteed?
Yes, for a year. If anything is not right with the work within the year, let us know and we’ll sort it.
What colour sealant will you use?
We use white, clear or a colour to suit the finishes. Tell us what you’d like when you get a quote.
Is it normal for sealant to crack in a new home?
Cracking in the first couple of years is common as timber and plaster dry out. Poor preparation at handover adds to it.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
New build mastic for homes and businesses in Finsbury
Our new-build work comes in two parts: plot mastic for developers, and putting right failed sealant for people who’ve bought a new home. In both, preparation makes the difference, because that’s what rushed new-build sealant normally lacks. We work on skirting & floors, kitchens and bathrooms & en suites, and common reasons people get in touch are smeared, uneven beads picked up at snagging and cracked caulk along new skirting.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, and new homes need their plot mastic finished properly before handover.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Place
- Finsbury (EC1V, N1, EC2A)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for new build mastic
You will get a clear quote before any work starts. It’s based on:
- The number and length of the joints
- The type of sealant required
- Working hours on commercial sites
- Mould in or behind the old joints
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- If someone has resealed it before
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
- Where the property is
Want a quote for new build mastic? Please call 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Why it’s worth doing now in Finsbury
A quick bead over the top of the old sealant can look fine at first, but it will not bond to the old layer. Taking it all out and starting again is the only way to get a lasting seal. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Finsbury.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What you get with us
- 20+ years of sealant experience
- Anti-fungal silicone where joints get wet
- We’re fully insured
- You choose the colour before work begins
Read how sealant jobs are priced and our reviews.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What sealant work can’t fix
Sealant is not the answer to every problem, and we will tell you before work begins. It will not solve:
- Damaged fittings that need replacing
- Structural cracks in walls or ceilings
- Baths and trays that move too much for sealant to cope with
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before you book.
What we seal
- Plot handovers
- Bathrooms & en suites
- Kitchens
- Windows & doors
- Skirting & floors
- Show homes
Joints and finishes in Finsbury homes
Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you’ve bought a new home near Old Street station, the sealant around baths, showers and frames is worth checking in the first year or two. As a London address, Finsbury can be tricky for parking: let us know about parking bays, permits or a driveway.
Finsbury is about 2 miles north of London, in Greater London. We carry out new build mastic for homes and businesses in Finsbury. We cover 764 towns and villages across Greater London, large and small.
Work in EC1V, N1 and EC2A works the same way as everywhere else we cover. You’ll find streets such as Oat Lane, Long Lane and Love Lane. Main roads around Finsbury include the A1 and A501. Other places close to Finsbury include St Luke's (1 mile north), Barbican Estate (1 mile south), City of London (1 mile south), Bishopsgate (1 mile south-east) and Shoreditch (1 mile east). Larger places within reach include City of Westminster (3 miles west), Kensington (5 miles west), Walthamstow (5 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west) and Brompton (4 miles south-west).
Landmarks near Finsbury
We work in homes and buildings around Artillery Ground, Barts Health Archives and Charterhouse Square School. You will also find The Jugged Hare pub (under half a mile south), St Mary-at-Hill (0.9 miles south-east) and Central Foundation Boys' School (under half a mile north-east). Finsbury has its own railway station: Old Street station. Nearby you will also find Honourable Artillery Company Museum (under half a mile east) and Gabriel's Wharf (1.2 miles south-west). Open spaces near Finsbury include Barnsbury Wood and Ludgate Hill.
Towns and villages near Finsbury
What else we do in Finsbury
How the job changes by surface
Show homes
In a show home, the sealant is on display. Every bead is neat and coloured to suit the room.
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.
How it works
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours in a single home, depending on how much there is to do. In a London area like Finsbury, 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 go through the snagging list or plot schedule and agree the joints to do.
- The old bead comes out in full, with no layer left behind.
- We clean off dust from the build and prime the surfaces where the product needs it.
- A sealant chosen for each area goes in and is tooled smooth.
- We check every joint and tell you how long each needs to cure.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
- Let us know about earlier repairs to the joints
Get a quote
Getting a quote is simple: 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’ll come back to you with a quote.
Advice
Landlords, agents and businesses in Finsbury
Housing providers, facilities teams and property managers book us too in Finsbury and across Greater London. We can quote a run of properties together, and we are fully insured.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.