Greater London · England
East Finchley New Build Mastic
We cover East Finchley for plot mastic for developers and snagging failed sealant in new homes. Old material cut out, joints cleaned and sealed neatly.
- Internal frame sealant that has split
- Gaps behind new kitchen upstands
- Plot mastic for developers ahead of handover
How we handle new build mastic in East Finchley
Some new-home owners let the house settle before resealing. For small cosmetic gaps, that is reasonable, but a failed shower or bath seal shouldn’t wait. We work on skirting & floors, windows & doors and plot handovers, and common reasons people get in touch are shower seals failing in the first year or two and skirting joints opening in the first winter.
Much of London’s new housing is flats in larger developments. Snagging there often goes through the developer or managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Where
- East Finchley (N2, N3, NW11)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for most snagging lists, longer for a run of plots. In East Finchley, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We go through the snagging list or plot schedule and agree the joints to do.
- The old bead comes out in full, with no layer left behind.
- We clean off dust from the build and prime the surfaces where the product needs it.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
How to prepare
- Try not to wet indoor joints just before the visit
- Tell us about any water getting in
- Tell us if parking is tricky
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or email us.
Advice
East Finchley: your questions answered
Do you cover East Finchley for new build mastic?
Yes. Our work covers London and the South East, and East Finchley is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Do you work for landlords with property near New Southgate station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
How long should I leave it?
Cure times vary by product and the conditions. We tell you how long to leave it before we go.
Will you just run a new bead over the existing one?
No. Fresh silicone does not stick to the old layer, so sealing over the top fails quickly. We cut the old bead out completely.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams in East Finchley and across Greater London. We can quote a run of properties together, and we’re fully insured for the work.
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Wait for the cure time before using a resealed shower
- Do not wait for the house to settle if water is getting through
- Record problems with dated pictures
- Ventilate bathrooms well, especially in the first year
Ventilation matters in a new home, which is still drying out. Run the fan or open a window after bathing so moisture does not sit on the sealant.
Don’t let the snagging period run out with sealant problems unreported. After that, putting it right may fall to you so report it promptly.
Common problems we fix in East Finchley
Sealant applied onto damp surfaces does not bond well. Site programmes do not always leave time for joints to dry.
The problems people usually mention when they call are:
- Gaps between new skirting and floors
- Messy sealant that spoils new finishes
- Sealant applied over dusty or wet surfaces
- Plot mastic for developers ahead of handover
As a London address, East Finchley can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- Is the old sealant removed completely?
- Which colour the sealant will be
- Whether they’re fully insured
- How the surfaces are prepared before sealing
How the job changes by surface
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.
Show homes
We seal show-home bathrooms, kitchens and frames to a tidy standard. Tell us when the home is open so we can plan around it.
Can I do it myself?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Honest limits
Before you book, it’s worth knowing the limits too:
- Leaking fittings rather than failed sealant
- A tray or bath that isn’t properly supported, until it’s fixed
- Cracked trays, tiles or worktops
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
What we seal
- Show homes
- Kitchens
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Windows & doors
Places near East Finchley
More services for East Finchley
Joints and finishes in East Finchley homes
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For new homes near New Southgate station, it’s worth checking the sealant early, while snags are still fresh.
East Finchley is about 5 miles north of Marylebone, in Greater London. If you need new build mastic in East Finchley, please ring 0345 464 0079 or drop us an email for a quick quote. We cover Greater London from our Crawley base, East Finchley included. Across Greater London, we cover 764 places, East Finchley among them. London is on our list too, about 7 miles from East Finchley.
Postcode districts we cover here for new build mastic: N2, N3 and NW11. Whether your property is on Oak Lane, Maya Road and High Road or anywhere close by, we can help. East Finchley is on the A1, so it’s easy for us to get to. We also cover Hampstead Garden Suburb (1 mile south-west), Fortis Green (1 mile east), Temple Fortune (1 mile south-west), Muswell Hill (1 mile east) and Golders Green (2 miles south-west). We also work in nearby towns such as London (7 miles south-east), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (6 miles south), St Pancras (5 miles south-east) and Shoreditch (6 miles south-east).
What’s near East Finchley
We work in homes and buildings around Tollington School, Francis Skaryna Belarusian Library and Museum and Bishop Douglass School Finchley, among other places. Also close by are Lyttelton Playing Fields (0.5 miles south) and The Bald Faced Stag pub (0.5 miles east). For rail, the closest station is New Southgate station, about 2.2 miles north-east. Other landmarks nearby include Grand Arcade (1.6 miles north) and Jewish Museum - Finchley (0.7 miles north-west). The countryside around East Finchley includes Highgate Hill and Long Lane Pasture.