Greater London · England
New-build mastic & snagging in Kensal Rise, Greater London
Plot mastic for developers and snagging failed sealant in new homes for Kensal Rise, backed by a one-year guarantee. Ask us for a quote.
- Worktop and upstand sealant coming away
- Cracked sealant around new window and door frames
- Plot mastic for developers ahead of handover
How we handle new build mastic in Kensal Rise
In a new home, every joint should have a clean, even bead. Smeared, patchy or cracked sealant is worth sorting early, before water reaches anything behind it. If you’re dealing with gaps opening as the house dries out and settles and kitchen sealant that has pulled off the wall, we can put it right.
Much of London’s new housing is flats in larger developments. Snagging there often goes through the developer or managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
A 12-month guarantee comes as standard, so you’re covered after we have gone.
- Place
- Kensal Rise (W10, NW10, NW6)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for new build mastic
Your quote is based on your job. We look at:
- Access and height
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
If you’re in Kensal Rise and need new build mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Joints and finishes in Kensal Rise homes
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
If you’ve bought a new home near Kensal Rise station, the sealant around baths, showers and frames is worth checking in the first year or two.
Kensal Rise is about 1 mile south-west of Kilburn, in Greater London. Wherever you are in the W10 postcode area, our applicators can take on new build mastic. Across Greater London, we cover 764 places, Kensal Rise among them. You can also see our page for London, about 6 miles away.
All of W10, NW10 and NW6 is covered for new build mastic, from the main roads to the quietest streets. If you need new build mastic at a property on Hazel Road, Hiley Road and Kempe Road or anywhere close by, our applicators can take on the job. We also cover the places around Kensal Rise: Kensal Green (1 mile west), Kilburn (1 mile north-east), Queen's Park (1 mile east), North Kensington (1 mile south) and Kensal Town (1 mile south-east). We also work in nearby towns such as London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles east), St Pancras (4 miles east), Shoreditch (6 miles east) and Walthamstow (9 miles north-east).
What’s near Kensal Rise
Locally, jobs take us to homes and businesses close to Paradise by Way of Kensal Green pub, Queens Park Community School and Brondesbury College and the streets around them. Kensal Rise has its own railway station: Kensal Rise station. Nearby you will also find Brent Museum and Archives (1.1 miles north-west) and Westfield London (1.8 miles south). Not far away are The Long Water and Campden Hill.
How the visit works
We keep the work tidy and contained to the area we are working on, so you can get on with your day. The job generally takes a few hours in a single home. In Kensal Rise, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or send us an email.
Related advice
Signs you need new build mastic in Kensal Rise
If plaster or screed was still damp when it was sealed, the bond suffers. Site programmes do not always leave time for joints to dry first.
Look out for any of the following:
- Joints pulling apart as timber shrinks
- Cracked sealant around new window and door frames
- Worktop and upstand sealant coming away
- Sealant applied over dusty or wet surfaces
Kensal Rise is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What to look for in a quote
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- Which colour the sealant will be
- What happens if the job turns out different
Also near Kensal Rise
What else we do in Kensal Rise
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
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 fails, we can still redo it.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Ventilate bathrooms well, especially in the first year
- Avoid running a DIY bead over the old one
- Do not wait for the house to settle if water is getting through
- Wait for the cure time before using a resealed shower
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries.
Early snagging is easier snagging. Small faults turn into leaks if left in a busy bathroom.
Why it’s worth doing now in Kensal Rise
Resealing everything on a snagging list in one visit is usually simpler than chasing joints one at a time. It’s one visit, one quote and one set of cure times to plan around. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
What you get with us
- We leave the area clean and tidy
- A 12-month guarantee on all work
- Old sealant always removed completely
- Full insurance on every job
See how sealant jobs are priced and our reviews.
Surface by surface
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. We reseal it with a weatherproof, flexible sealant.
Skirting and floors
Floors and skirting move as the house dries and the heating runs. We use a flexible product rather than caulk.
Questions from Kensal Rise
Is Kensal Rise in your area for new build mastic?
Yes. We work across London and the South East, and Kensal Rise is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Is parking a problem for a job in Kensal Rise?
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.
Can you do plot mastic on a new development?
Yes. We carry out plot mastic and second-fix sealing for builders and developers. Send the schedule and any specification and we’ll give you a quote.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Can you work from my snagging list?
Yes. Send it with photos and we will quote for the sealant items. Items that need a plumber, tiler or the builder are flagged.
Why has my new-build shower seal failed already?
It’s common, and there are generally two reasons: the house moving as it dries, and sealant that never bonded properly. Cutting it out and resealing properly fixes both.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.