Greater London · England
New-build mastic & snagging in South Kenton, Greater London
New build mastic across South Kenton and nearby, with every bit of old sealant taken out first.
- Leaking shower tray seals in a new home
- Second-fix sealing on new plots
- Gaps behind new kitchen upstands
Your questions about new build mastic in South Kenton
Can parking be tricky for a visit in South Kenton?
Parking in South Kenton, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Is South Kenton in your area for new build mastic?
Yes, South Kenton is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Can new sealant go on top of the old bead?
No. New silicone will not bond to old silicone, so it soon lifts and traps water. We cut the old bead out completely.
When is the best time to reseal in a new build?
Any seal that is leaking should be redone straight away. For small cosmetic gaps, waiting until the house has settled can save doing them twice.
Where do you work from?
We work from Crawley. We cover South Kenton and the rest of Greater London.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator.
Why does sealant fail so quickly in new builds?
There are generally two causes: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area.
New build mastic in South Kenton
A new build should have a neat, sound bead at every joint. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water gets into the floor or walls. Typical jobs include gaps opening as the house dries out and settles and shower seals failing in the first year or two, on kitchens, bathrooms & en suites and plot handovers.
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.
Big or small, it’s backed by our 12-month guarantee.
- Place
- South Kenton (HA9, HA0, HA3)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What new build mastic looks like in South Kenton
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. Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent.
South Kenton is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
South Kenton is about 1 mile north-west of Wembley, in Greater London. If you need new build mastic in South Kenton, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London, South Kenton included. We cover 764 towns and villages across Greater London. Our London page covers work nearby, about 10 miles away.
Here we cover the HA9, HA0 and HA3 postcode area for new build mastic. We cover properties on Peel Road, Holt Road and Byron Road. Other places close to South Kenton include Northwick Park (1 mile west), Kenton (1 mile north), North Wembley (1 mile south), Brondesbury Park (1 mile south) and Harrow on the Hill (1 mile west). Larger places within reach include London (10 miles south-east), City of Westminster (8 miles south-east), Marylebone (8 miles south-east), Kensington (7 miles south-east), St Pancras (9 miles east) and Shoreditch (10 miles east).
Around South Kenton
In South Kenton, that means homes and buildings near Windermere pub, Preston Park and Wembley High Technology College, among other places. There’s a railway station in South Kenton itself: South Kenton station. Nearby you will also find St. Mark's Hospital (0.6 miles north-west) and Kodak Museum (2.2 miles north-west). For a walk, there’s Castlebar Hill and Masons Field.
Nearby places to South Kenton
Other services in South Kenton
How it works
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. It normally takes anything from a few hours to several days, depending on the number of plots. In South Kenton, 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 agreeing which joints are on the list, from the snagging sheet or plot schedule.
- The old bead comes out in full, with no layer left behind.
- Each joint is cleaned of dust and grit, then primed if required.
- A sealant chosen for each area goes in and is tooled smooth.
- Finally, each room is checked and you are given the cure time.
How to prepare
- Try not to wet indoor joints just before the visit
- Move anything stored near the joints
- On commercial sites, let us know about site rules
How to get a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few photos by email make the job easier to understand, and we will take it from there.
Related advice
Why it’s worth doing now in South Kenton
A quick bead over the top of the old sealant can look fine at first, but it cannot bond to what’s underneath. A lasting seal starts with removing the old one completely. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
Why choose Mr Mastic in South Kenton
- Any old sealant cut out fully, not covered over
- Experience in homes, commercial sites and hotels
- 12-month guarantee on every job
- Anti-fungal silicone where joints get wet
Honest limits
We will not take on work that won’t last, so here’s what sealant can’t put right:
- Plumbing faults behind the sealant
- Disputes or warranty claims with your builder
- Broken tiles or a split tray
If in doubt, ring 0345 464 0079 or email us and we will say what we think before booking.
Surfaces we seal
- Skirting & floors
- Windows & doors
- Plot handovers
- Bathrooms & en suites
- Show homes
- Kitchens
What affects the cost of new build mastic
We quote each job individually. This is what makes a difference:
- Access and height
- The old material and how stubborn it is
- Mould in or behind the old joints
- Any working-time requirements on site
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
Asking for a quote
When you call or email, these details help:
- How we’d reach the joints
- Whether it has been sealed before
- Where the property is
- Photos by email, if that’s easy
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
DIY versus a professional finish
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.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
How the job changes by surface
Kitchens
Beside the sink, the joint takes water every day. A kitchen sealant goes in there suited to the job.
Plot handovers
Good preparation at handover saves snagging later. We clean out building dust before sealing and primer used where needed.
Do you need new build mastic in South Kenton?
Baths and trays settle under load once the home is lived in. A bath sealed empty drops slightly when filled, straining the joint and the sealant may split.
Keep an eye out for any of the following:
- Untidy sealant flagged on a snagging list
- Gaps behind new kitchen upstands
- Skirting joints opening in the first winter
- Leaking shower tray seals in a new home
For new homes near South Kenton station, it’s worth checking the sealant early, while snags are still fresh.
Questions to ask before you book
- What guarantee comes with the work
- Who turns up on the day
- How the surfaces are prepared before sealing
- What the cure time is