Greater London · England
Pentonville New Build Mastic
New build mastic for Pentonville, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracks appearing as a new home settles
- New-build shower sealant that has already split
- Gaps between new skirting and floors
How we quote for new build mastic
The price is agreed before any work begins. It takes into account:
- Access and height
- The type of sealant required
- Any mould that needs treating
- When we can work, for business premises
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- Roughly how big the job is
- The problem you’ve noticed
- A few pictures by email, if you can
- Where the property is
We quote each job on its own. Just ring 0345 464 0079 or email us with the details and send photos if you have them.
New build mastic in Pentonville
Snagging sealant properly means taking the failed bead out completely. Fresh silicone can’t bond to the old layer, so it all comes out before we clean, dry and reseal. Common call-outs are for smeared, uneven beads picked up at snagging and joints pulling apart as timber shrinks, on kitchens, windows & doors and show homes.
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.
We stand behind the work with a 12-month guarantee, so you are covered after we have gone.
- Location
- Pentonville (N1, N1P, EC1V)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Do you need new build mastic in Pentonville?
Later trades and the final clean can damage fresh sealant. A bead disturbed before it has cured may never seal properly and it shows once the home is in use.
Signs it’s time to call us include:
- Sealant applied over dusty or wet surfaces
- Shower seals failing in the first year or two
- Second-fix sealing on new plots
- Skirting joints opening in the first winter
As a London address, Pentonville can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- How the surfaces are prepared before sealing
- When the joint can take water or movement
- How much experience the applicator has
- What happens if they find a problem under the old sealant
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes anything from a few hours to several days, depending on the number of plots. In Pentonville, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Clear items away from the joints we are working on
- For business premises, tell us about site rules or sign-in
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, ring 0345 464 0079 or send us an email.
Advice
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Settlement cracks that need a surveyor
- Movement caused by a poorly fitted tray or bath
- Damaged fittings that need replacing
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
Where we work in Pentonville
- Windows & doors
- Show homes
- Plot handovers
- Bathrooms & en suites
- Skirting & floors
- Kitchens
Different surfaces, different methods
Kitchens
Beside the sink, the joint takes water every day. We use a sealant suited to kitchens, food-safe where it’s needed.
Plot handovers
Developers can send the plot schedule and specification. We seal bathrooms, kitchens, frames and floors.
New homes and floors in Pentonville
Many of London’s new homes are flats in bigger 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
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.
Pentonville is about 1 mile north-east of St Pancras, in Greater London. Wherever you are in the N1 postcode area, we cover new build mastic for homes and businesses. Our area takes in 764 places across Greater London, from the larger towns to small villages.
Our applicators cover all of N1, N1P and EC1V for new build mastic. If you need new build mastic at a property on City Road, Noel Road and Dewey Road or anywhere close by, our applicators can take on the job. Pentonville is on the A1200, which makes it straightforward to reach. If you are just outside Pentonville, we cover Angel (1 mile south-west), Islington (1 mile north), Clerkenwell (1 mile south), Barnsbury (1 mile north-west) and St Pancras (1 mile south-west). Further out, we also cover City of Westminster (3 miles south-west), Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (4 miles west), Ruislip (13 miles west) and Brompton (4 miles south-west).
Landmarks near Pentonville
Typical jobs here are in homes near Islington Green School, The Camden Head Public House and Pilsudski Institute of London, among other places. Nearby too are City of London Academy Islington (within half a mile east) and Barnard Park (within half a mile west). The nearest railway station is Essex Road station, roughly 0.5 miles north-east of the centre. A little further out are Museum of Funeral History (0.7 miles south-west) and Brunswick Centre (1.2 miles south-west). Open spaces near Pentonville include Ludgate Hill and St. James's Park Lake.
Also near Pentonville
More services for Pentonville
Pentonville questions
I let a flat near Essex Road station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Do you cover Pentonville for new build mastic?
Yes. We work across London and the South East, and Pentonville is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Will the old sealant be removed?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Do you work for developers?
Yes. We take on second-fix sealant work across new plots. We clean and prime joints properly to keep callbacks down.
Can I send you my snagging list?
Yes. Snagging lists are a common starting point for us. We agree the sealant items with you before work begins.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Is it worth resealing while the house is still settling?
Where water is getting through, do not wait. Hairline cosmetic gaps can wait until the house has settled.
Is it normal for sealant to crack in a new home?
Cracking in the first couple of years is common. Poor preparation at handover adds to it.
Landlord and commercial work in Pentonville
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We work for landlords and agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.