Greater London · England
Hanwell New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for Hanwell, backed by a one-year guarantee. Ask us for a quote.
- Cracked caulk along new skirting
- Leaking shower tray seals in a new home
- Sealant work across a run of new homes
New build mastic in Hanwell, done properly
Some owners wait for the first year’s movement before having joints redone. For small cosmetic gaps, that is reasonable, but a seal that is letting water through needs doing now. Typical jobs include messy sealant that spoils new finishes and plot mastic for developers ahead of handover, on windows & doors, skirting & floors and show homes.
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.
Every job is covered by our one-year guarantee.
- Where
- Hanwell (W7, W13, UB2)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
New build mastic around Hanwell
Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, Hanwell can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Hanwell is about 1 mile west of Ealing, in Greater London. Homes, rented property, offices and hotels in Hanwell is covered for new build mastic, old or new, large or small. Every job comes with our one-year guarantee. Hanwell is one of 764 places in Greater London we cover. You can also see our page for London, about 10 miles away.
Work in W7, W13 and UB2 works the same way as everywhere else we cover. Local streets include Park Road, Green Lane and Felix Road, and we cover them all. Being close to the A4001, Hanwell is easy for our applicators to reach for new build mastic. Neighbouring places we cover for new build mastic include West Ealing (1 mile west), Ealing (1 mile east), Dormers Wells (1 mile north-west), South Ealing (1 mile south-east) and Pitshanger (2 miles north-east). Larger places within reach include London (10 miles east), City of Westminster (8 miles east), Marylebone (8 miles east), Kensington (6 miles east), St Pancras (10 miles east) and Shoreditch (11 miles east).
What’s near Hanwell
We work in homes and buildings around Drayton Manor High School, Cuckoo Schools and Drayton Green and the streets around them. There’s a railway station in Hanwell itself: Hanwell station. A little further out are Ealing Hospital (under half a mile west) and Gunnersbury Park House - Large Mansion (2.3 miles east). For a walk, there’s Middle Lake and Castlebar Hill.
Different surfaces, different methods
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. It’s resealed with an exterior sealant suited to the frame and wall.
Quotes for new build mastic in Hanwell
We do not publish a price list, because no two jobs are the same. The quote depends on:
- How much old sealant there is and how hard it is to remove
- How much there is to do
- Whether there’s mould to deal with
- The product the joint needs
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
When you call or email, it’s useful to know:
- Whether it’s a home or a business
- Where the job is, and your postcode
- The rough size of the job
- What’s wrong with the joints now
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or send us an email with the details.
Nearby places to Hanwell
Also in Hanwell
What happens if it’s left?
Water getting past a failed seal in a new build reaches walls and floors that are still settling. Dealing with it early keeps the damage away from ceilings, floors and finishes. 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. Putting it right early is much less trouble.
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What you get with us
- White, clear, grey or another colour, product permitting
- 4.9 on Google from 180+ five-star reviews
- Tidy, careful work
- A 12-month guarantee on all work
Take a look at what affects the cost or our reviews.
Honest limits
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Deciding who is responsible under a builder’s warranty
- Cracked trays, tiles or worktops
- Settlement cracks that need a surveyor
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Kitchens
- Skirting & floors
- Show homes
- Plot handovers
- Bathrooms & en suites
- Windows & doors
What we’re called out for in Hanwell
Once people move in, baths and trays take weight and bed down. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used.
Signs it’s time to call us include:
- Cracked caulk along new skirting
- Gaps opening as the house dries out and settles
- Sealant work across a run of new homes
- Frame joints opening as the plaster dries
If you’ve bought a new home near Hanwell station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- What insurance they hold
- Whether the sealant suits the joint
- Is VAT in the price?
- What happens if they find a problem under the old sealant
Should I try it myself first?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
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.
How it works
All our tools and materials come with us in the van. Once we have agreed what’s being done, we protect the area and start. Most jobs take a few hours for most snagging lists, longer for a run of plots. For a job in Hanwell, 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.
- Each joint is checked for movement before we start.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Need a quote? Please call 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
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Your questions about new build mastic in Hanwell
Can parking be tricky for a visit in Hanwell?
Parking in Hanwell, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you work for landlords with property near Hanwell station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Can you do plot mastic on a new development?
Yes. We work through plots to your schedule, room by room. Get in touch with the number of plots and the scope and we’ll quote.
Is it normal for sealant to crack in a new home?
Lots of new homes see sealant crack early. Rushed application on dusty surfaces makes it worse.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that generally means someone at home.
Is the work guaranteed?
Yes, always. Each job is guaranteed for twelve months.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Do you have insurance?
Yes. Mr Mastic is fully insured.