Greater London · England
New-build mastic & snagging in Willesden, Greater London
Professional new build mastic in and around Willesden, with every bit of old sealant taken out first and a one-year guarantee.
- Cracked sealant around new window and door frames
- Messy sealant that spoils new finishes
- Gaps between new skirting and floors
New build mastic in Willesden, done properly
Developers send us the plot schedule and we work through it. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover. If you have beads laid onto grit and dust from the build and second-fix sealing on new plots, we can put it right.
New flats are going up across London, many of them 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.
All our work comes with a one-year guarantee.
- Where
- Willesden (NW10, NW2)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Joints and finishes in Willesden homes
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Willesden is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Willesden is about 2 miles west of Hampstead, in Greater London. Every kind of property in Willesden is covered for new build mastic. Every job comes with our 12-month guarantee. Our area takes in 764 places across Greater London. For nearby work, see our London page.
We cover every part of NW10 and NW2 for new build mastic and the streets around it. If you need new build mastic at a property on Tudor Mews, Chaplin Road and Belton Road or a nearby road, we can help. Being close to the B453, Willesden is simple for us to get to for new build mastic. Close by, we work in Willesden Green (1 mile south), Neasden (1 mile north-west), Church End (1 mile west), Cricklewood (1 mile north-east) and Harlesden (1 mile south-west). Within a short drive, we also cover London (7 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (4 miles south-east), St Pancras (5 miles east) and Shoreditch (7 miles east).
Around Willesden
Locally, jobs take us to homes and businesses close to Brondesbury College, Royal Oak Inn and Capital City Academy. For rail, the closest station is Kensal Rise station, about 1.1 miles south-east of the centre. A little further out are Brent Cross Shopping Centre (2 miles north) and Brent Museum and Archives (less than half a mile east). Open spaces near Willesden include The Long Water and Primrose Hill.
What we can’t put right
It helps to know what we cannot do too:
- Settlement cracks that need a surveyor
- Your warranty claim itself, which is between you and the builder
- A tray or bath that isn’t properly supported, until it’s fixed
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
Where we work in Willesden
- Bathrooms & en suites
- Skirting & floors
- Show homes
- Windows & doors
- Kitchens
- Plot handovers
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
When to call us in Willesden
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.
People normally contact us after spotting something like this:
- Frame joints opening as the plaster dries
- Leaking shower tray seals in a new home
- Gaps opening as the house dries out and settles
- Worktop and upstand sealant coming away
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.
What your quote should include
- The length of the guarantee
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
- Which colour the sealant will be
Common questions in Willesden
Can parking be tricky for a visit in Willesden?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you help a landlord with a rental near Kensal Rise station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Are you insured?
Yes, we’re fully insured for domestic and commercial work.
Do you take on second-fix sealing for builders?
Yes. Plot mastic and second-fix sealing for developers is part of our work. Send us the plot schedule and we’ll quote.
Which products 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.
Can you reseal over the builder’s sealant?
No. New silicone won’t bond to old silicone, so it soon lifts and traps water. We cut the old bead out completely.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Is it worth resealing while the house is still settling?
For failed seals that let water through, the best time is now. Cosmetic gaps can wait until the first year or two of movement has passed.
Leave it or put it right?
It often makes sense to do all the sealant items on a snagging list together. It’s one visit, one quote and one set of cure times to plan around. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first.
Why us?
- Anti-fungal silicone where joints get wet
- Old sealant always removed completely
- Arbo and Everbuild products
- Rated 4.9 stars on Google
Take a look at how sealant jobs are priced and our reviews.
What affects the quote in Willesden
Jobs vary more than people expect. The main factors:
- Any working-time requirements on site
- The size of the job
- The old material and how stubborn it is
- How easy the joints are to reach
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How many joints, rooms or windows are involved
- The type of property
- What’s wrong with the joints now
- Whether it has been sealed before
For a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours in a single home, including the tidy-up. For a job in Willesden, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First we work through your snagging list or plot schedule with you.
- We cut out every bit of the failed or messy sealant.
- Each joint is cleaned of dust and grit, then primed if required.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Each area is checked and left with its cure time.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we are working on
Get a quote
If you’re in Willesden and need new build mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
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How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Avoid scourers and strong chemicals on sealant
- Resist patching a failed seal with a tube from the DIY shop
- Get a leaking seal dealt with right away
- Photograph failed sealant before it’s redone
Avoid standing on the rim of the bath or the edge of the tray while the sealant cures. Report any movement in a bath or tray.
Early snagging is easier snagging. Small faults turn into leaks if left over time.