Greater London · England
New-build mastic & snagging in West Hampstead, Greater London
New build mastic in West Hampstead from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Second-fix sealing on new plots
- Kitchen sealant that has pulled off the wall
- Skirting joints opening in the first winter
Joints and finishes in West Hampstead homes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
As a London address, West Hampstead can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
West Hampstead is about 3 miles north-west of City of Westminster, in Greater London. Jobs in West Hampstead get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. 764 places in Greater London are on our list, large and small. Our London page covers work nearby, about 6 miles away.
Jobs for new build mastic in NW3, NW6 and NW2 is quoted and booked the same way as anywhere else. Whether your property is on Mill Lane, Acol Road and Ajax Road or anywhere close by, we can help. Main roads around West Hampstead include the A502. Other places close to West Hampstead include Fortune Green (1 mile west), Hampstead (1 mile east), Greenhill (1 mile east), Childs Hill (1 mile north-west) and Vale of Health (1 mile north-east). Within a short drive, we also cover London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles east).
Local landmarks in West Hampstead
Typical jobs here are in homes near South Hampstead High School, Holly Bush pub and Kilburn Grange Park, among other places. West Hampstead has its own railway station: Finchley Road & Frognal station. Other landmarks nearby include Isokon Gallery (1.2 miles east) and New End Hospital (0.5 miles north-east). Not far away are Parliament Hill and Westbere Copse.
New build mastic in West Hampstead
Some new-home owners let the house settle before resealing. For small cosmetic gaps, that is reasonable, but a seal that’s letting water through needs doing now. If you’re dealing with gaps behind new kitchen upstands and sealant that never bonded to the surface, we can help, on windows & doors, show homes and kitchens alike.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, while new homes need a neat, sound finish around frames, baths and kitchens before handover.
All of our work is guaranteed for twelve months.
- Location
- West Hampstead (NW3, NW6, NW2)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in West Hampstead
Sealant is often one of the last jobs before handover. Dusty, unprimed joints are common, so the bead never bonds properly.
Keep an eye out for any of the following:
- Messy sealant that spoils new finishes
- New-build shower sealant that has already split
- Beads laid onto grit and dust from the build
- Cracked sealant around new window and door frames
For new homes near Finchley Road & Frognal station, it’s worth checking the sealant early, while snags are still fresh.
Before you book anyone
- Who turns up on the day
- What insurance they hold
- Whether they seal over old material or remove it
- How hidden problems are handled
Landlord and commercial work in West Hampstead
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured.
For anyone letting property in or around West Hampstead, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
What affects the cost of new build mastic
You’ll get a clear quote before work begins. It takes into account:
- How easy the joints are to reach
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
- The product the joint needs
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Common questions in West Hampstead
Can parking be tricky for a visit in West Hampstead?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Is West Hampstead in your area for new build mastic?
Yes. We work across London and the South East, and West Hampstead is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
My new home is still under warranty. Should I contact you?
Your builder, if you are still in their snagging or warranty period. If that doesn’t work out, we’re happy to quote.
Do you use white or clear sealant?
That depends on what the joint meets: white or clear in most bathrooms, and a colour to suit worktops, frames and floors elsewhere. We agree the colour before we start.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Why does sealant fail so quickly in new builds?
There are normally 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 landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
How long will you be here?
Typically it takes anything from a few hours to several days, depending on the number of plots. Larger jobs naturally take longer, and we will say how long yours will take.
What happens if it’s left?
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it keeps failing or is not dealt with, we can reseal it properly. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in West Hampstead, the repair is bigger than a sealant job.
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What you get with us
- One-year guarantee on every job
- White, clear, grey or coloured to suit, where the product allows
- Anti-fungal sanitary silicone in wet areas
- ARBOMaster approved applicator
Take a look at how sealant jobs are priced or customer reviews.
Also near West Hampstead
Also in West Hampstead
How the visit works
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the job takes anything from a few hours to several days, depending on the number of plots for a typical job. In a London area like West Hampstead, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, phone 0345 464 0079 or drop us an email.
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Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Wait for the cure time before using a resealed shower
- Look at the sealant regularly in the first couple of years
- Act quickly if a seal starts to leak
- Raise failed sealant with the developer while you’re covered
Wipe the sealant with warm soapy water. Keep scourers and harsh chemicals off it as they wear the bead.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak in a busy bathroom.