Greater London · England
North Sheen New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for North Sheen, backed by a 12-month guarantee. Call for a quick quote.
- Leaking shower tray seals in a new home
- Smeared, uneven beads picked up at snagging
- Gaps behind new kitchen upstands
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How we handle new build mastic in North Sheen
Across North Sheen, we work for both new-home owners and the builders handing those homes over. Whether it’s one en suite or a run of plots, the method is the same: remove, clean, prime where needed, then a neat new bead. If you have kitchen sealant that has pulled off the wall and cracked sealant around new window and door frames, we can help, whatever the surface.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement.
Whatever the size of the job, it’s backed by our one-year guarantee in North Sheen and across Greater London.
- Location
- North Sheen (TW9, SW14, W4)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to North Sheen
What else we do in North Sheen
Aftercare tips
A little care helps the new joints last. We recommend:
- Do not seal over failed sealant yourself
- Check bath and shower seals every few months as the house settles
- Ventilate bathrooms well, especially in the first year
- Wipe joints with warm soapy water
Ventilation matters in a new home, which is still drying out. Run the fan or open a window after bathing.
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.
The process
On the day, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before work begins. The work usually takes a few hours in a single home. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in North Sheen. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at why each joint failed, including any movement.
- Old sealant is cut out and the joints cleaned.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
- Try not to wet indoor joints just before the visit
Getting a quote
We don’t publish a price list, because every job is different. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or send us an email.
Related advice
Why deal with it now?
A hairline gap at a skirting can wait, but water getting through can’t. Not sure whether yours can wait? You can call 0345 464 0079 or send us an email with a few photos and we’ll give you a straight answer. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in North Sheen.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- An ARBOMaster approved applicator
- You choose the colour before work begins
- A 12-month guarantee on all work
- Full insurance on every job
Take a look at our cost guide and customer reviews.
Do you need new build mastic in North Sheen?
The wrong product is sometimes used in the wrong place: decorators’ caulk in a wet area, or a stiff sealant where there’s movement. Neither lasts long.
If you can see any of these, it’s time to have the joints looked at:
- Joints pulling apart as timber shrinks
- Frame joints opening as the plaster dries
- Kitchen sealant that has pulled off the wall
- Second-fix sealing on new plots
If you’ve bought a new home near Kew Gardens station, the sealant around baths, showers and frames is worth checking in the first year or two.
Before you book anyone
- What insurance they hold
- Whether they seal over old material or remove it
- How hidden problems are handled
- When the joint can take water or movement
Different surfaces, different methods
Skirting and floors
Gaps under skirting are one of the most common new-build snags. A flexible sealant closes it without cracking like caulk.
Show homes
In a show home, the sealant is on display. We lay neat, even beads in colours to suit the finishes.
Joints and finishes in North Sheen homes
Much of London’s new housing is flats in larger 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, North Sheen can be tricky for parking: let us know about parking bays, permits or a driveway.
North Sheen is about 3 miles south of Acton, in Greater London. We provide new build mastic to homes and businesses in North Sheen and the surrounding area, as part of our work across Greater London. North Sheen is one of 764 towns and villages in Greater London we cover for new build mastic. We also work in London, around 8 miles away.
Jobs for new build mastic in TW9, SW14 and W4 is quoted and booked the same way as anywhere else. That includes homes and businesses on Kent Road, Ibis Lane and The Avenue. Close by, we work in Kew (1 mile north), Grove Park (1 mile north-east), Strand-on-the-Green (1 mile north), East Sheen (1 mile south-east) and Mortlake (1 mile south-east). Further out, we also cover London (8 miles east), City of Westminster (6 miles north-east), Marylebone (6 miles north-east), Kensington (4 miles north-east), St Pancras (8 miles north-east) and Shoreditch (9 miles east).
Landmarks near North Sheen
Locally, jobs take us to homes and businesses close to Kew College Prep, Dukes Meadows and Chiswick School. North Sheen has its own railway station: Kew Gardens station. A little further out are Barnes Hospital (1.1 miles south-east) and Livat Hammersmith (2.5 miles north-east). Green spaces nearby include Kew Gardens Lake and Duke's Hollow.
Common questions in North Sheen
I let a flat near Kew Gardens station. Can you help?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
Is North Sheen in your area for new build mastic?
Yes. Our work covers London and the South East, and North Sheen is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
When is the best time to reseal in a new build?
Where water is getting through, don’t wait. Small gaps that are just cosmetic can be resealed once movement has slowed.
How much does new build mastic cost in North Sheen?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or send us an email and let us know what needs doing and where.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Are you fully insured?
Yes. We are fully insured.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours for most snagging lists, longer for a run of plots. We’ll give you a better idea when we quote.
Can you reseal over the builder’s sealant?
No. We always remove the existing bead, the joint cleaned and primed where needed, before resealing.
Honest limits
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Cracked trays, tiles or worktops
- Baths and trays that move too much for sealant to cope with
- Structural cracks in walls or ceilings
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Bathrooms & en suites
- Kitchens
- Skirting & floors
- Windows & doors
- Plot handovers
- Show homes