Greater London · England
New-build mastic & snagging in Chiswick, Greater London
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Chiswick. Fully insured, ARBOMaster approved and guaranteed for a year.
- Shower seals failing in the first year or two
- Skirting joints opening in the first winter
- Gaps opening as the house dries out and settles
New build mastic for homes and businesses in Chiswick
We work in new homes and on new-build sites across Chiswick. One shower or a whole phase of plots, the method does not change: cut out, clean, prime where needed and reseal neatly. We work on show homes, kitchens and bathrooms & en suites, and the jobs we see most are gaps between new skirting and floors and second-fix sealing on new plots.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Every joint between floor, skirting and threshold has to cope with some movement, in Chiswick as anywhere.
Our work is backed for twelve months.
- Where
- Chiswick (W4, SW14)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What happens if it’s left?
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it can’t bond to what’s underneath. A lasting seal starts with removing the old one completely. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
What you get with us
- Anti-fungal silicone where joints get wet
- 4.9 on Google from 180+ five-star reviews
- Full insurance on every job
- A sealant colour to suit the surroundings
See our cost guide and our reviews.
What we’re called out for in Chiswick
A new house holds a lot of water from the build, which takes a year or two to dry out. Drying timber shrinks and pulls joints apart, and sealant that can’t keep up splits.
People usually contact us when they notice something like this:
- Messy sealant that spoils new finishes
- Shower seals failing in the first year or two
- Cracked sealant around new window and door frames
- Kitchen sealant that has pulled off the wall
For new homes near Chiswick station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- Which colour the sealant will be
- What insurance they hold
- What preparation is included
- What product goes in the joint
Towns and villages near Chiswick
Also in Chiswick
New build mastic in Chiswick: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
Chiswick is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Chiswick is about 1 mile south of Acton, in Greater London. From the centre of Chiswick to the outskirts, we cover new build mastic for every kind of property, from flats and houses to offices and hotels. We cover 764 towns and villages across Greater London, large and small. London is on our list too, around 7 miles away.
Here we cover the W4 and SW14 postcode area for new build mastic. New build mastic is available to properties on Pumping Station Road, Dale Street and Devonshire Road and the roads around them. Close by, we work in Turnham Green (1 mile south), Old Chiswick (1 mile south-east), Grove Park (1 mile south-west), Gunnersbury (1 mile west) and Strand-on-the-Green (1 mile west). We also work in nearby towns such as London (7 miles east), City of Westminster (5 miles east), Marylebone (5 miles east), St Pancras (6 miles north-east), Shoreditch (8 miles east) and Walthamstow (12 miles north-east).
Landmarks near Chiswick
Locally, jobs take us to homes and businesses close to Polish Library POSK in London, Mawson Arms and Chiswick School. You’ll also find Turnham Green (0.5 miles west) and The Swedish School (0.6 miles south-east). The nearest railway station is Chiswick station, about 0.8 miles south-west. Well-known places in the area include West London Hospital (1.5 miles east) and Kurdish Museum Library and Archive (0.8 miles east). The countryside around Chiswick includes Campden Hill and Duke's Hollow.
What happens on the day
You do not need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes anything from a few hours to several days, depending on the number of plots for a typical job. In Chiswick, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Preparing for the visit
- Clear items away from the joints we are working on
- Tell us about any water getting in
- Tell us if parking is tricky
Get a quote
We don’t publish a price list. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or send us an email.
Read more
DIY sealant or a professional job?
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. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Avoid running a DIY bead over the old one
- Ventilate bathrooms well, especially in the first year
- Act quickly if a seal starts to leak
- Clean sealant with mild detergent, not abrasives
Do not stand on the bath edge or the lip of the tray in the first few weeks. Report any movement in a bath or tray.
If a shower tray or bath seal splits in the first year, look for movement. Getting it resealed properly, and any movement checked, stops it recurring.
Chiswick: your questions answered
Can you do new build mastic in Chiswick?
Yes. We work across London and the South East, and Chiswick is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Can you help a landlord with a rental near Chiswick station?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
How long will you be here?
As a guide, most jobs take a few hours for most snagging lists, longer for a run of plots. Bigger jobs take longer, and we will tell you how long to expect.
How much does new build mastic cost in Chiswick?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before work begins.
Can you work from my snagging list?
Yes. Snagging lists are a common starting point for us. We agree the sealant items with you before any work starts.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses and we’re fully insured.
Is it normal for sealant to crack in a new home?
New homes dry out and move in their first couple of years, and sealant is often applied quickly onto dusty surfaces. Both lead to early failure.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all.
Surface by surface
Windows and doors
A draught at a new window can be a missed or failed joint. We look at the joints and reseal where needed.
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We take it out and reseal neatly, colour-matched where it shows.
Work for landlords, hotels and businesses
Letting agents and landlords in Chiswick can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.