Greater London · England
New Build Mastic in Upper Holloway
Professional new build mastic in and around Upper Holloway, with old sealant always removed completely and a 12-month guarantee.
- Kitchen sealant that has pulled off the wall
- Beads laid onto grit and dust from the build
- Internal frame sealant that has split
About our new build mastic in Upper Holloway
A new build should have a neat, sound bead at every joint. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water gets into the floor or walls. We work on show homes, windows & doors and skirting & floors, and the jobs we see most are sealant that never bonded to the surface and cracks appearing as a new home settles.
New flats are going up across London, many of them in larger developments. In a new development, snags are often reported through the developer or the managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
Your job is guaranteed for a year, as with all our work.
- Where
- Upper Holloway (N19, N7, N6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Upper Holloway
When the heating goes on in the first winter, the house dries fast. Gaps open along skirting, frames and worktops.
Most people get in touch when they notice something like this:
- Skirting joints opening in the first winter
- Cracks appearing as a new home settles
- Beads laid onto grit and dust from the build
- Kitchen sealant that has pulled off the wall
Upper Holloway 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
- The length of the guarantee
- Are they insured?
- Whether all the old sealant comes out first
- Whether VAT is included
Nearby places to Upper Holloway
More services for Upper Holloway
Your questions about new build mastic in Upper Holloway
Do you cover Upper Holloway for new build mastic?
Yes. We work across London and the South East, and Upper Holloway is part of that. Just phone 0345 464 0079 or email us with a few details of the job.
Can you help a landlord with a rental near Upper Holloway station?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Do you guarantee your work?
Yes, always. There’s a 12-month guarantee on every job, wherever you are.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
When is the best time to reseal in a new build?
For failed seals that let water through, the best time is now. For small cosmetic gaps, waiting until the house has settled can save doing them twice.
Why has my new-build shower seal failed already?
It’s common, and there are usually two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. A proper reseal deals with both.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Who should fix failed sealant in a new build?
Report it to the builder first while you are covered. Once that is done, or if they will not put it right, we’ll cut it out and reseal it.
What sealant work can’t fix
It helps to know what we cannot do too:
- Deciding who is responsible under a builder’s warranty
- Plumbing faults behind the sealant
- A tray or bath that isn’t properly supported, until it’s fixed
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
What we seal
- Show homes
- Kitchens
- Plot handovers
- Windows & doors
- Bathrooms & en suites
- Skirting & floors
Surface by surface
Windows and doors
The gap between a new frame and its plaster reveal often opens up. We remove cracked sealant and apply a flexible one.
Plot handovers
Taking time over preparation reduces return visits. Dust from the build is removed first and primer used where needed.
How the visit works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and tidy away. It generally takes a few hours in a single home. In a London area like Upper Holloway, 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 look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- 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.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we are working on
- Tell us if parking is tricky
How to get 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 photos by email if you can.
Related advice
Looking after it afterwards
After the cure time, these simple habits help:
- Follow the cure time we give you
- Look at the sealant regularly in the first couple of years
- Avoid scourers and strong chemicals on sealant
- Do not seal over failed sealant yourself
Follow the cure time we give you before the area gets wet. Most silicones need around a day to cure enough for use.
Lifting sealant traps moisture and mould behind it. Resealing before mould gets in saves a harder job later.
Leave it or put it right?
A hairline gap at a skirting can wait, but a leaking seal cannot. Not sure whether yours can wait? You can phone 0345 464 0079 or send us an email with a few pictures and we will give you a straight answer. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Upper Holloway, the repair is bigger than a sealant job.
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Why us?
- A sealant colour to suit the surroundings
- We leave the area clean and tidy
- We never seal over old sealant
- Anti-fungal silicone where joints get wet
Read our cost guide or what customers say.
Joints and finishes in Upper Holloway homes
Much of London’s new housing is flats in larger 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.
If you’ve bought a new home near Upper Holloway station, the sealant around baths, showers and frames is worth checking in the first year or two.
Upper Holloway is about 2 miles east of Hampstead, in Greater London. If you need new build mastic in Upper Holloway, please call 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Greater London. Upper Holloway is one of 764 towns and villages in Greater London we cover.
Every address in N19, N7 and N6 is covered for new build mastic. That includes homes and businesses on Ward Road, Kiver Road and Foxham Road and the roads around them. Being close to the A103, Upper Holloway is easy for our applicators to reach for new build mastic. Close by, we work in Tufnell Park (1 mile south), Dartmouth Park (1 mile south-west), Highgate (1 mile north-west), Nag's Head (1 mile south-east) and Holloway (1 mile south-east). Further out, we also cover London (5 miles south), City of Westminster (4 miles south), Marylebone (3 miles south), Kensington (5 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south-east).
Landmarks near Upper Holloway
Locally, jobs take us to homes and businesses close to City of London Academy, Whittington Park and The Mother Red Cap pub, among other places. Also close by are Asanté Academy of Chinese Medicine (1.2 miles north-west) and Vaughan Williams Memorial Library (2 miles south). Upper Holloway has its own railway station: Upper Holloway station. Well-known places in the area include The Mall Wood Green (2.3 miles north-east) and Royal Northern Hospital (0.5 miles south-east). Open spaces near Upper Holloway include Dartmouth Park Hill and Parkland Walk.
For landlords and businesses
Letting agents and landlords in Upper Holloway can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.