Greater London · England
Brondesbury New Build Mastic
New-build sealant joints in Brondesbury need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Sealant that never bonded to the surface
- Kitchen sealant that has pulled off the wall
- Plot mastic for developers ahead of handover
How we handle new build mastic in Brondesbury
Some owners wait for the first year’s movement before having joints redone. That makes sense for small gaps that are just cosmetic, but a seal that is letting water through needs doing now. If you are dealing with shower seals failing in the first year or two and gaps opening as the house dries out and settles, we can put it right, whatever the surface.
Much of London’s new housing is flats in larger developments. In a new development, snags are often reported through the developer or the managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Brondesbury (NW6, NW2, NW10)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
For anyone letting property in or around Brondesbury, several properties can go on one quote. Send us the addresses and the work at each.
Your questions about new build mastic in Brondesbury
Is parking an issue for new build mastic in Brondesbury?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near Brondesbury station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Do you come to Brondesbury?
Yes. We are based in Crawley and work across South East England, London and Scotland, Brondesbury included.
Who should fix failed sealant in a new build?
If you’re still within the builder’s snagging or warranty period, report it to them first. If it isn’t sorted, or keeps failing, get in touch with us.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Do you have insurance?
Yes. We’re fully insured, and we can confirm the details when we quote.
What new build mastic looks like in Brondesbury
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. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
If you’ve bought a new home near Brondesbury station, the sealant around baths, showers and frames is worth checking in the first year or two.
Brondesbury is about 1 mile north of Kilburn, in Greater London. We provide new build mastic to homes and businesses in Brondesbury. Brondesbury is one of 764 places in Greater London we cover. London is on our list too, about 6 miles from Brondesbury.
Jobs for new build mastic in NW6, NW2 and NW10 works the same way as everywhere else we cover. Local streets include Dyne Road, Mill Lane and The Avenue, all of which we cover. Main roads around Brondesbury include the A4003, so getting to you is simple. If you’re just outside Brondesbury, we cover Kilburn (1 mile south), Cricklewood (1 mile north-west), Queen's Park (1 mile south), Kensal Rise (1 mile south-west) and Willesden Green (1 mile west). Larger places within reach include London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (3 miles south), St Pancras (4 miles east) and Shoreditch (6 miles east).
Local landmarks in Brondesbury
We work in homes and buildings around Black Lion pub, Kilburn Grange Park and Brondesbury College and the streets around them. There’s a railway station in Brondesbury itself: Brondesbury station. Nearby you will also find New End Hospital (1.5 miles north-east) and Brent Museum and Archives (1 mile west). For a walk, there’s Primrose Hill and Westbere Copse.
How we quote for new build mastic
The quote reflects the job in front of us. We take into account:
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- Whether the work is at height
- The amount of work
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- Any access issues, like height or stairs
- Where the job is, and your postcode
- Roughly how big the job is
Need a quote? Please ring 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear price before any work starts.
Do you need new build mastic in Brondesbury?
Sealant applied onto damp surfaces does not bond well. Site programmes do not always leave time for joints to dry.
If you can see any of these, it’s time to have the joints looked at:
- New-build shower sealant that has already split
- Gaps between new skirting and floors
- Gaps opening as the house dries out and settles
- Gaps behind new kitchen upstands
As a London address, Brondesbury can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- Are they insured?
- How much experience the applicator has
- Is the old sealant removed completely?
- How hidden problems are handled
How the visit works
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself normally takes a few hours for most snagging lists, longer for a run of plots, depending on the size of the job. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out, 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.
- We tool every joint neatly and tell you when each area can be used.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Mention if the joints have been sealed before
- Tell us about any water getting in
Getting a quote
If you’re in Brondesbury and need new build mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Read more
Why act early in Brondesbury
Sealant done properly at handover means fewer callbacks. Snagging visits for failed sealant cost time on every plot, and they’re avoidable with good preparation. Converted houses in London often have a bathroom above someone else’s living room, 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 Brondesbury.
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why Brondesbury clients choose us
- We’re fully insured
- Homes, businesses and hotels
- Sanitary silicone with an anti-fungal additive in wet areas
- Trusted Arbo and Everbuild sealants
See what affects the cost and what customers say.
Looking after it afterwards
So the new joints stay in good condition:
- Keep water off fresh sealant until it has cured
- Ventilate bathrooms well, especially in the first year
- Raise failed sealant with the developer while you are covered
- Avoid scourers and strong chemicals on sealant
Keep the bathroom ventilated, especially in the first year. Run the fan or open a window after bathing to help keep mould away.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak over time.
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.