Greater London · England
Gunnersbury New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for homeowners, landlords and businesses in Gunnersbury. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Messy sealant that spoils new finishes
- Joints pulling apart as timber shrinks
- New-build shower sealant that has already split
New homes and floors in Gunnersbury
London and the South East are among the drier parts 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.
Gunnersbury is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Gunnersbury is about 1 mile south of Acton, in Greater London. Jobs in Gunnersbury get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Greater London coverage runs to 764 places, and Gunnersbury is one of them. London is on our list too, about 8 miles from Gunnersbury.
We cover every part of W4, W3 and TW8 for new build mastic. You’ll find streets such as Kew Road, Kent Road and Power Road, all of which we cover. Gunnersbury sits on or near the A3000. We also cover the places around Gunnersbury: Strand-on-the-Green (1 mile south), Kew (1 mile south), Grove Park (1 mile south-east), Chiswick (1 mile east) and Turnham Green (1 mile south-east). Larger places within reach include London (8 miles east), City of Westminster (6 miles east), Marylebone (6 miles east), Kensington (3 miles east), St Pancras (7 miles east) and Shoreditch (9 miles east).
What’s near Gunnersbury
Around Gunnersbury, our work takes us to homes and buildings near Clayton Hotel Chiswick, Kew College Prep and Ark Acton Academy, among other places. You’ll also find Turnham Green (0.5 miles east) and Library for Iranian Studies (1 mile north). There’s a railway station in Gunnersbury itself: Gunnersbury station. A little further out are Barnes Hospital (2 miles south-east) and Livat Hammersmith (2.1 miles east). For a walk, there’s Kew Gardens Lake and Castlebar Hill.
How we handle new build mastic in Gunnersbury
Some new-home owners let the house settle before resealing. For small cosmetic gaps, that’s reasonable, but a seal that is letting water through needs doing now. We’re often asked to deal with beads laid onto grit and dust from the build and shower seals failing in the first year or two, on bathrooms & en suites, skirting & floors and show homes.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, while new homes need a neat, sound finish around frames, baths and kitchens before handover, in Gunnersbury and beyond.
Our work is backed for twelve months, in Gunnersbury and everywhere else we cover.
- Where
- Gunnersbury (W4, W3, TW8)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Gunnersbury
Also in Gunnersbury
Questions from Gunnersbury
Do you work for landlords with property near Gunnersbury station?
Yes. We work for landlords and letting agents as well as householders. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you cover Gunnersbury for new build mastic?
Yes. We work across London and the South East, and Gunnersbury is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Why has my new-build shower seal failed already?
New homes dry out and move in their first couple of years, and sealant is often rushed onto dusty, unprimed surfaces. Either can make it fail early.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
Can new sealant go on top of the old bead?
No. Over-sealing traps mould and water and soon fails. We remove every bit of the old bead before resealing.
Do you work for developers?
Yes. We work through plots to your schedule ready for handover. Tell us the plots and the joints involved for a clear quote.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
How the visit works
Good joint work is mostly preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours for most snagging lists, longer for a run of plots. In Gunnersbury, 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.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely down to clean surfaces.
- Joints are vacuumed and cleaned of building dust.
- 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.
Before we arrive
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we’re working on
How to get a quote
Want a quote for new build mastic? Please ring 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Landlord and commercial work in Gunnersbury
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
If you manage several properties in or around Gunnersbury, several properties can be quoted together. Send us the addresses and the work at each.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Act quickly if a seal starts to leak
- Record problems with dated pictures
- Avoid running a DIY bead over the old one
- Avoid scourers and strong chemicals on sealant
Photograph failed sealant before it’s redone and keep the builder’s replies. It’s useful if you need to raise other issues later.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small and the new finishes intact.
Surface by surface
Kitchens
Beside the sink, the joint takes water every day. A kitchen sealant goes in there, food-safe where it’s needed.
Skirting and floors
As timber and screed dry, skirting and floors shift. Caulk cracks; a flexible sealant moves with it painted or coloured to suit.
When to call us in Gunnersbury
A new house holds a lot of water from the build, and it dries out over the first couple of years. Drying timber shrinks and pulls joints apart.
The problems people usually mention when they call include:
- Smeared, uneven beads picked up at snagging
- Gaps behind new kitchen upstands
- Gaps between new skirting and floors
- Sealant applied over dusty or wet surfaces
If you’ve bought a new home near Gunnersbury station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- Who turns up on the day
- Which sealant they’ll use, and why
- How the surfaces are prepared before sealing
- How hidden problems are handled
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Broken tiles or a split tray
- Leaking fittings rather than failed sealant
- Deciding who is responsible under a builder’s warranty
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Kitchens
- Plot handovers
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
- Show homes