Greater London · England
New-build mastic & snagging in Arnos Grove, Greater London
Plot mastic for developers and snagging failed sealant in new homes for homes and businesses in Arnos Grove and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps behind new kitchen upstands
- Smeared, uneven beads picked up at snagging
- Joints pulling apart as timber shrinks
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
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.
New build mastic in Arnos Grove
We never seal over a failed new-build bead. Fresh silicone can’t bond to the old layer, so it all comes out before we clean, dry and reseal. If you have kitchen sealant that has pulled off the wall and second-fix sealing on new plots, we can help.
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.
A 12-month guarantee comes as standard, so you are covered after we’ve gone.
- Where
- Arnos Grove (N11, N14, N13)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each 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.
Show homes
We seal show-home bathrooms, kitchens and frames ready for viewings. We will plan around viewing times.
Looking after it afterwards
Aftercare is simple:
- Put sealant faults on your snagging list early
- Avoid scourers and strong chemicals on sealant
- Avoid running a DIY bead over the old one
- Open a window or run the fan after bathing
Follow the cure time we give you before the area gets wet. Silicone is usually left for about a day before water reaches them.
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.
Arnos Grove: your questions answered
Can you do new build mastic in Arnos Grove?
Yes. We work across London and the South East, and Arnos Grove is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Is parking a problem for a job in Arnos Grove?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
Are you fully insured?
Yes. We’re fully insured.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
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.
Can you do several jobs on one visit?
Yes. More than one area can be quoted together.
What affects the cost of new build mastic
The quote reflects the job in front of us. We look at:
- The product the joint needs
- Whether the work is at height
- When we can work, for business premises
- Any mould that needs treating
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Helping us quote
When you call or email, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
What happens if it’s left?
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it won’t bond to the old layer. A lasting seal starts with removing the old one completely. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why us?
- A 12-month guarantee on all work
- Neat joints and a tidy finish
- Rated 4.9 stars on Google
- Over 20 years’ experience
Take a look at what affects the cost and our reviews.
How it works
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours for most snagging lists, longer for a run of plots. In Arnos Grove, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at why each joint failed, including any movement.
- Old sealant is cut out and the joints cleaned.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
How to prepare
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
- Try not to wet indoor joints just before the visit
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Advice
New build mastic around Arnos Grove
The South East is one of 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 snagging may go through the developer or managing agent.
If you’ve bought a new home near New Southgate station, the sealant around baths, showers and frames is worth checking in the first year or two. As a London address, Arnos Grove can be tricky for parking: let us know about parking bays, permits or a driveway.
Arnos Grove is about 3 miles north-east of Finchley, in Greater London. If you need new build mastic in Arnos Grove, it’s easy to get a quote: please ring 0345 464 0079 or email us. We’re based in Crawley and cover Greater London. Our area takes in 764 places across Greater London, from the larger towns to small villages. London is on our list too, around 8 miles away.
We work across N11, N14 and N13 for new build mastic and the streets around it. That includes homes and businesses on Oak Lane, High Road and York Road and the roads around them. Arnos Grove is on the A109 and A1004, so it’s easy for us to get to with everything needed for new build mastic. We also cover the places around Arnos Grove: New Southgate (1 mile west), Bounds Green (1 mile south), Southgate (1 mile north), Palmers Green (1 mile east) and Oakthorpe Park (1 mile east). We also work in nearby towns such as London (8 miles south), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (9 miles south), St Pancras (6 miles south) and Shoreditch (7 miles south).
What’s near Arnos Grove
In Arnos Grove, that means homes and buildings near The Ranelagh pub, Broomfield School and Broomfield Park. Arnos Grove’s nearest station is New Southgate station, roughly 0.6 miles west. Well-known places in the area include Broomfield House Museum (0.5 miles east) and The Mall Wood Green (1.7 miles south-east). The countryside around Arnos Grove includes Highgate Hill and Darland's Lake.
Also near Arnos Grove
Other services in Arnos Grove
What sealant work can’t fix
To be straight with you, some problems need a different trade:
- Structural cracks in walls or ceilings
- Your warranty claim itself, which is between you and the builder
- Baths and trays that move too much for sealant to cope with
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before booking.
Where we work in Arnos Grove
- Show homes
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
- Plot handovers