Greater London · England
New Build Mastic in North Kensington
Plot mastic for developers and snagging failed sealant in new homes in North Kensington, with a one-year guarantee on every job. Ask us for a quote.
- Kitchen sealant that has pulled off the wall
- Sealant work across a run of new homes
- Leaking shower tray seals in a new home
What the job involves on each surface
Plot handovers
Plot mastic is carried out to the developer’s schedule. Joints are prepared properly before sealing to keep callbacks down.
Kitchens
As a new house dries, worktops and walls shift a little, opening gaps behind the upstand. A fresh flexible bead closes them.
New build mastic in North Kensington
New homes move as they dry out. Timber dries and shrinks, and baths and trays settle, so sealant that was laid quickly before handover often cracks. Common call-outs are for messy sealant that spoils new finishes and gaps between new skirting and floors, across bathrooms & en suites, show homes and kitchens.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Every joint between floor, skirting and threshold has to cope with some movement, in North Kensington as anywhere.
Big or small, it’s backed by our 12-month guarantee in North Kensington and across Greater London.
- Place
- North Kensington (W10, NW10, W11)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours in a single home. For a job in North Kensington, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are 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, with no layer left behind.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
How to prepare
- Let us know about earlier repairs to the joints
- For business premises, tell us about site rules or sign-in
- Keep pets and children clear of the area while we work
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.
Advice
When to call us in North Kensington
New homes are full of moisture from plaster, screed and concrete, and it dries out over the first couple of years. Drying timber shrinks and pulls joints apart, and sealant that cannot keep up splits.
If you can see any of these, it’s time to have the joints looked at:
- Untidy sealant flagged on a snagging list
- Sealant that never bonded to the surface
- Gaps opening as the house dries out and settles
- Leaking shower tray seals in a new home
As a London address, North Kensington can be tricky for parking: let us know about parking bays, permits or a driveway.
Questions to ask before you book
- Whether all the old sealant comes out first
- What happens if they find a problem under the old sealant
- Whether they’re fully insured
- How long to leave it before use
When it isn’t the sealant
It helps to know what we cannot do too:
- Cracking that points to a structural problem
- Baths and trays that move too much for sealant to cope with
- Cracked trays, tiles or worktops
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before booking.
What we seal
- Show homes
- Windows & doors
- Kitchens
- Skirting & floors
- Plot handovers
- Bathrooms & en suites
Places near North Kensington
Also in North Kensington
FAQs for North Kensington
Can you help a landlord with a rental near Kensal Green station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Do you cover North Kensington for new build mastic?
Yes. Our work covers London and the South East, and North Kensington is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing.
Do you use white or clear sealant?
We use white, clear or a colour to suit the finishes. Let us know your preference when you ask for a quote.
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.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, the joint cleaned and primed where needed, and a new bead applied.
How long will you be here?
A typical job takes anything from a few hours to several days, depending on the number of plots, including the preparation. We will confirm how long when we quote.
My new home is still under warranty. Should I contact you?
Start with the builder if you are in the snagging or warranty period. If it is not resolved, we can reseal it properly.
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 12-month guarantee.
For anyone letting property in or around North Kensington, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
New build mastic in North Kensington: local notes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
For new homes near Kensal Green station, it’s worth checking the sealant early, while snags are still fresh.
North Kensington is about 2 miles north-west of Kensington, in Greater London. Whether you’re in the middle of North Kensington or further out, new build mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and North Kensington is one of them. There’s also a page for London, roughly 6 miles from North Kensington.
Work in W10, NW10 and W11 is quoted and booked the same way as anywhere else. Local streets include Peach Road, Barlby Road and Eynham Road. Other places close to North Kensington include Kensal Town (1 mile east), Kensal Green (1 mile north-west), Kensal Rise (1 mile north), Notting Dale (1 mile south-east) and White City (1 mile south). Within a short drive, we also cover London (6 miles east), City of Westminster (3 miles east), Marylebone (3 miles east), St Pancras (4 miles east), Shoreditch (6 miles east) and Walthamstow (9 miles north-east).
Around North Kensington
We work in homes and buildings around Little Wormwood Scrubs, Maida Vale School and The Eagle pub. For rail, the closest station is Kensal Green station, about 0.5 miles north of the centre. Other landmarks nearby include Princess Louise Hospital (less than half a mile south-west) and Culture House (1.3 miles south). Not far away are Campden Hill and Greville Place nature reserve.
Leave it or put it right?
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it keeps failing or is not dealt with, we can reseal it properly. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in North Kensington, the repair is bigger than a sealant job.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why choose Mr Mastic in North Kensington
- One-year guarantee on every job
- More than 20 years in sealant work
- Domestic, commercial and hotel work
- Fully insured
Take a look at how sealant jobs are priced or our reviews.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.