Greater London · England
New-build mastic & snagging in North Finchley, Greater London
Problem with your new-build sealant joints in North Finchley? We cut out the old, prepare the joints and apply the right sealant.
- Plot mastic for developers ahead of handover
- New-build shower sealant that has already split
- Worktop and upstand sealant coming away
New build mastic in North Finchley, done properly
Snagging sealant properly means taking the failed bead out completely. Fresh silicone can’t bond to the old layer, so it all comes out before we clean, dry and reseal. We are often asked to deal with cracks appearing as a new home settles and cracked caulk along new skirting, on plot handovers, windows & doors and skirting & floors.
Across London, commercial floors have movement joints that break down under heavy foot traffic, while new homes need a neat, sound finish around frames, baths and kitchens before handover.
There’s a 12-month guarantee on every job, large or small.
- Location
- North Finchley (N12, N20, N11)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Joints and finishes in North Finchley homes
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. Much of London’s new housing is flats in larger 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.
North Finchley is about 1 mile north of Finchley, in Greater London. Wherever you are in the N12 postcode area, we cover new build mastic for homes and businesses. Across Greater London, we cover 764 places, North Finchley among them. We also work in London, about 9 miles from North Finchley.
All of N12, N20 and N11 is covered for new build mastic. Whether your property is on High Road, Lodge Lane and Percy Road or a nearby road, our applicators can take on the job. With the A1000 close by, North Finchley is simple for us to get to for new build mastic. Nearby, we also carry out new build mastic in Woodside Park (1 mile west), Oakleigh Park (1 mile north), Whetstone (1 mile north), Friern Barnet (1 mile east) and Finchley (1 mile south). Further out, we also cover London (9 miles south-east), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (8 miles south), St Pancras (7 miles south) and Shoreditch (8 miles south-east).
Near you in North Finchley
Typical jobs here are in homes near Friary Park, Woodhouse College and The Bohemia pub and the streets around them. Also close by are Francis Skaryna Belarusian Library and Museum (0.5 miles west) and St Michael's Catholic Grammar School (less than half a mile south-west). The nearest railway station is New Southgate station, about 1.4 miles east of the centre. Well-known places in the area include Finchley Memorial Hospital (0.8 miles south) and Francis Skaryna Belarusian Library and Museum (0.5 miles west). Open spaces near North Finchley include Darland's Lake and Glebelands Local Nature Reserve.
Landlords, agents and businesses in North Finchley
Landlords and agents in North Finchley can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
Leave it or put it right?
A hairline gap at a skirting can wait, but a leaking seal can’t. Not sure whether yours can wait? You can call 0345 464 0079 or drop 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. Dealing with it early is far simpler.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why us?
- Neat joints and a tidy finish
- A 12-month guarantee on all work
- An ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
Towns and villages near North Finchley
Other services in North Finchley
Do you need new build mastic in North Finchley?
Sealant is often one of the last jobs before handover. Joints aren’t always cleaned of dust or primed, so the bead never bonds properly.
These are the problems we are asked about most:
- Shower seals failing in the first year or two
- Second-fix sealing on new plots
- Kitchen sealant that has pulled off the wall
- Smeared, uneven beads picked up at snagging
As a London address, North Finchley can be tricky for parking: let us know about parking bays, permits or a driveway.
Questions to ask before booking
- When the joint can take water or movement
- How hidden problems are handled
- Which colour the sealant will be
- How much experience the applicator has
Keeping the joints in good condition
Looking after new joints is easy:
- Do not wait for the house to settle if water is getting through
- Keep water off fresh sealant until it has cured
- Look at the sealant regularly in the first couple of years
- Record problems with dated pictures
Watch the joints as the house settles. Hairline gaps can open as timber and plaster dry.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small and protects the rest of the house.
When it is not the sealant
We will not take on work that won’t last, so here’s what sealant cannot put right:
- Baths and trays that move too much for sealant to cope with
- Damaged fittings that need replacing
- Settlement cracks that need a surveyor
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Where we work in North Finchley
- Windows & doors
- Bathrooms & en suites
- Show homes
- Skirting & floors
- Plot handovers
- Kitchens
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take 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 Finchley. 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.
- Baths are filled with water, then the new sealant is applied.
- We check every joint and leave you with the cure times.
Before we arrive
- On commercial sites, let us know about site rules
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
Get a quote
Want a quote for new build mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
FAQs for North Finchley
I let a flat near New Southgate station. Can you help?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Can parking be tricky for a visit in North Finchley?
Parking in North Finchley, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Why does sealant fail so quickly in new builds?
Cracking in the first couple of years is common, because the house is drying and settling. Rushed application on dusty surfaces makes it worse.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
Do I need to be at home?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that normally means someone at home.
Do you work in North Finchley?
Yes. We are based in Crawley and work across South East England, London and Scotland, and that includes North Finchley.
Can I do it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, the joint cleaned and primed where needed, before resealing.
What the job involves on each surface
Show homes
We seal show-home bathrooms, kitchens and frames. We will plan around viewing times.
Skirting and floors
Wet-area floor joints need a flexible seal. We seal them with a sealant suited to wet areas.