Greater London · England
Park Royal New Build Mastic
Specialist new build mastic for Park Royal: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Cracks appearing as a new home settles
- Sealant applied over dusty or wet surfaces
- Leaking shower tray seals in a new home
New build mastic for homes and businesses in Park Royal
Building dust is behind a lot of failed new-build sealant. We clean every joint thoroughly and prime where the surface and product need it, so the sealant actually sticks. We are often asked to deal with shower seals failing in the first year or two and gaps between new skirting and floors, on kitchens, show homes and windows & doors.
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.
Our work is backed for twelve months.
- Where
- Park Royal (NW10, W3, W5)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
How the job changes by surface
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Each joint is cleaned and primed where needed to keep callbacks down.
Kitchens
As a new house dries, worktops and walls shift a little, opening gaps behind the upstand. We reseal them with a flexible sealant.
Towns and villages near Park Royal
Other services in Park Royal
The process
All our tools and materials come with us in the van. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for most snagging lists, longer for a run of plots. In Park Royal, 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.
- First we work through your snagging list or plot schedule with you.
- Failed or untidy sealant is cut out completely.
- 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.
Before we arrive
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or send us an email.
Advice
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
We work for letting agents and landlords as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
New build mastic around Park Royal
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For new homes near Harlesden station, it’s worth checking the sealant early, while snags are still fresh.
Park Royal is about 1 mile south-west of Harlesden, in Greater London. Jobs in Park Royal get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 764 towns and villages across Greater London, from the larger towns to small villages. London is on our list too, about 8 miles from Park Royal.
Our applicators cover all of the NW10, W3 and W5 postcode area for new build mastic. If you need new build mastic at a property on Dukes Road, Abbey Road and Grieg Road or anywhere close by, our applicators can take on the job. We also cover West Twyford (1 mile north-west), Hanger Hill (1 mile south-west), Stonebridge (1 mile north), Stonebridge Park (1 mile north) and Old Oak Common (1 mile east). Within a short drive, we also cover London (8 miles east), City of Westminster (5 miles east), Marylebone (5 miles east), Kensington (4 miles south-east), St Pancras (7 miles east) and Shoreditch (8 miles east).
Near you in Park Royal
Locally, jobs take us to homes and businesses close to St. Raphael's Edible Garden, Grand Junction Arms and The Ellen Wilkinson School for Girls and the streets around them. Also close by are Library for Iranian Studies (1.5 miles south) and The Ellen Wilkinson School for Girls (1.1 miles south-west). Park Royal’s nearest station is Harlesden station, about 0.8 miles north-east of the centre. Well-known places in the area include London Designer Outlet (2 miles north) and London Transport Museum Depot (1.7 miles south). The countryside around Park Royal includes Castlebar Hill and Kew Gardens Lake.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Leaks from pipes, valves or wastes, which need a plumber
- Structural cracks in walls or ceilings
- A tray or bath that is not properly supported, until it’s fixed
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
Where we work in Park Royal
- Plot handovers
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Show homes
- Skirting & floors
Questions from Park Royal
Is parking an issue for new build mastic in Park Royal?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
I let a flat near Harlesden station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can you reseal over the builder’s sealant?
No. We always remove the existing bead, the joint cleaned and primed where needed, and a new bead applied.
Do you cover Park Royal?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, Park Royal included.
Do you work for developers?
Yes. Second-fix sealing in bathrooms, kitchens, frames and floors is part of what we do. We clean and prime joints properly to keep callbacks down.
When is the sealant fully cured?
Cure times vary by product. We tell you how long to leave it before we go.
Are you insured?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
What affects the cost of new build mastic
The quote reflects the job in front of us. We take into account:
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- Which sealant suits the joint
- Working hours on commercial sites
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- Photos by email, if that’s easy
- Any previous sealing or DIY work
Getting a quote is simple: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll come back to you with a quote.
Do you need new build mastic in Park Royal?
When the heating goes on in the first winter, the house dries fast. Gaps open along skirting, frames and worktops.
Most people get in touch after spotting something like this:
- Sealant work across a run of new homes
- Skirting joints opening in the first winter
- Beads laid onto grit and dust from the build
- Worktop and upstand sealant coming away
As a London address, Park Royal can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- What preparation is included
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
- Which sealant they’ll use, and why