Greater London · England
Finchley New Build Mastic
New-build sealant joints in Finchley need attention? We remove the old material, prepare the joints and seal them properly.
- Leaking shower tray seals in a new home
- Beads laid onto grit and dust from the build
- Sealant work across a run of new homes
About our new build mastic in Finchley
In a new home, every joint should have a clean, even bead. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water reaches anything behind it. Typical jobs include worktop and upstand sealant coming away and new-build shower sealant that has already split, on kitchens, skirting & floors and show homes.
New flats are going up across London, many of them in larger developments. Snagging there often goes through the developer or managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Finchley (N3, N2, N12, NW11)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Questions from Finchley
Is parking an issue for new build mastic in Finchley?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near New Southgate station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Is it normal for sealant to crack in a new home?
A new house dries and settles for a year or two, and sealant is often rushed onto dusty, unprimed surfaces. Both lead to early failure.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
My new home is still under warranty. Should I contact you?
Start with the builder if you’re in the snagging or warranty period. If it isn’t resolved, we’ll cut it out and reseal it.
Do you come to Finchley?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages.
Is it worth resealing while the house is still settling?
Any seal that is leaking should be redone straight away. Cosmetic gaps can wait until the first year or two of movement has passed.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Avoid running a DIY bead over the old one
- Watch for new gaps as the house dries out
- Open a window or run the fan after bathing
- Keep photos and emails about snagging items
Don’t stand on the bath edge or the lip of the tray while the sealant cures. If a bath or tray moves when you stand in it, get it looked at.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
New build mastic around Finchley
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. Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent.
For new homes near New Southgate station, it’s worth checking the sealant early, while snags are still fresh.
Finchley is about 6 miles north of City of Westminster, in Greater London. Homes, rented property, offices and hotels in Finchley is covered for new build mastic. Every job comes with our one-year guarantee. Our Greater London coverage runs to 764 places, Finchley among them. London is on our list too, about 8 miles from Finchley.
Jobs for new build mastic in N3, N2, N12 and NW11 works the same way as everywhere else we cover. Whether your property is on Station Road, Chaplin Square and Market Place or a nearby road, we can help. You will find Finchley on the B1462, which makes it straightforward to reach. We also cover the places around Finchley: Church End (1 mile west), Woodside Park (1 mile north), North Finchley (1 mile north), Friern Barnet (2 miles north-east) and Oakleigh Park (2 miles north). Within a short drive, we also cover London (8 miles south-east), City of Westminster (6 miles south), Marylebone (6 miles south), Kensington (7 miles south), St Pancras (6 miles south-east) and Shoreditch (7 miles south-east).
Local landmarks in Finchley
In Finchley, that means homes and buildings near The Elephant Inn, Bishop Douglass School and Francis Skaryna Belarusian Library and Museum and the streets around them. Also close by are Victoria Park (within half a mile north) and Woodhouse College (1 mile north-east). The nearest railway station is New Southgate station, about 1.9 miles north-east of the centre. A little further out are Finchley Memorial Hospital (within half a mile north-east) and Grand Arcade (1 mile north). Not far away are Highgate Hill and Lakeside Nature Reserve.
How we quote for new build mastic
For a quick quote, just ask. The main things that affect it are:
- The amount of work
- The type of sealant required
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Ask us for a quote and we’ll explain what it covers.
What we need to know
What to tell us when you ask for a quote:
- Where the property is
- What’s wrong with the joints now
- A few pictures by email, if you can
- If someone has resealed it before
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and give you a clear quote.
What the job involves on each surface
Plot handovers
Plot mastic is carried out to the developer’s schedule. Each joint is cleaned and primed where needed to keep callbacks down.
Windows and doors
Internal joints between frames and plaster often crack as a new house dries. We cut out the cracked bead and reseal with a flexible sealant that suits the frame.
For landlords and businesses
We work for landlords and letting agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
What we cannot put right
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Cracked trays, tiles or worktops
- Settlement cracks that need a surveyor
- Baths and trays that move too much for sealant to cope with
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Where we work in Finchley
- Show homes
- Plot handovers
- Kitchens
- Windows & doors
- Bathrooms & en suites
- Skirting & floors
Nearby places to Finchley
More services for Finchley
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for most snagging lists, longer for a run of plots, and the area is left clean. In a London area like Finchley, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- Failed or untidy sealant is cut out completely.
- We clean off dust from the build and prime the surfaces where the product needs it.
- New sealant suited to each joint is applied and tooled neatly.
- Each area is checked and left with its cure time.
Before we arrive
- Let us know about parking restrictions
- Clear the area around the work
- For business premises, tell us about site rules or sign-in
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Read more
When to call us in Finchley
Baths and trays settle under load once the home is lived in. A bath sealed empty drops slightly when filled, straining the joint.
The problems people normally mention when they call are:
- Joints pulling apart as timber shrinks
- Untidy sealant flagged on a snagging list
- Kitchen sealant that has pulled off the wall
- Skirting joints opening in the first winter
Finchley is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- Who turns up on the day
- Which colour the sealant will be
- Is VAT in the price?
- What happens if the job turns out different