Greater London · England
New-build mastic & snagging in Kentish Town, Greater London
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Kentish Town. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cracked sealant around new window and door frames
- New-build shower sealant that has already split
- Second-fix sealing on new plots
Your questions about new build mastic in Kentish Town
Is parking a problem for a job in Kentish Town?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you help a landlord with a rental near Kentish Town West station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Do you work for developers?
Yes. We take on second-fix sealant work across new plots. Good preparation keeps snagging to a minimum.
Is it normal for sealant to crack in a new home?
New homes dry out and move in their first couple of years, and sealant is often applied quickly onto dusty surfaces. Either can make it fail early.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Will you just run a new bead over the existing one?
No. New silicone won’t bond to old silicone, so it soon lifts and traps water. The old sealant always comes out first.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
What do you need from me for a quote?
Let us know what needs doing and where, plus photos if you have them. We will ask anything else we need to know.
About our new build mastic in Kentish Town
Developers send us the plot schedule and we work through it. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover with a sealant suited to each area. We work on windows & doors, bathrooms & en suites and plot handovers, and people most often call us about worktop and upstand sealant coming away and gaps opening as the house dries out and settles.
New flats are going up across London, many of them in larger developments. Snagging there often goes through the developer or managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Where
- Kentish Town (NW5, NW1, NW3)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
To keep the joints looking good and working properly:
- Do not wait for the house to settle if water is getting through
- Avoid running a DIY bead over the old one
- Put sealant faults on your snagging list early
- Record problems with dated pictures
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries and can be resealed later.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small.
How we quote for new build mastic
We do not publish a price list. What we look at:
- Whether the work is at height
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- Any working-time requirements on site
Leaving a failed joint usually makes the job bigger, not smaller. If you are not sure whether it needs doing, phone 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- Where the job is, and your postcode
- Any previous sealing or DIY work
- What’s wrong with the joints now
- Pictures of the joints, sent by email
Getting a quote is simple: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Landlords and agents in Kentish Town can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
How the job changes by surface
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Joints are prepared properly before sealing so the sealant lasts.
Kitchens
Beside the sink, the joint takes water every day. We use a sealant suited to kitchens, food-safe where it’s needed.
Towns and villages near Kentish Town
What else we do in Kentish Town
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours in a single home from start to finish. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Kentish Town. It helps if you can point us to a visitor permit or a bay close to the door.
- Each joint is checked for movement before any work starts.
- 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.
- We check every joint and leave you with the cure times.
Getting ready for the visit
- Let us know about parking restrictions
- Tell us about any water getting in
- Mention if the joints have been sealed before
Getting a quote
For new build mastic in Kentish Town, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
DIY sealant or a professional job?
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.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Honest limits
It helps to know what we cannot do too:
- Deciding who is responsible under a builder’s warranty
- Leaks from pipes, valves or wastes, which need a plumber
- Settlement cracks that need a surveyor
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Bathrooms & en suites
- Windows & doors
- Plot handovers
- Skirting & floors
- Show homes
- Kitchens
What new build mastic looks like in Kentish Town
Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, Kentish Town can be tricky for parking: let us know about parking bays, permits or a driveway. For new homes near Kentish Town West station, it’s worth checking the sealant early, while snags are still fresh.
Kentish Town is about 2 miles east of Hampstead, in Greater London. Every kind of property in Kentish Town is covered for new build mastic, old or new, large or small. The work is guaranteed for a year. Kentish Town is one of 764 towns and villages in Greater London we cover.
All of NW5, NW1 and NW3 is within our area for new build mastic, from the main roads to the quietest streets. That includes homes and businesses on Eton Road, Oval Road and Regal Lane. We also cover the places around Kentish Town: Chalk Farm (1 mile west), Camden Town (1 mile south-east), Gospel Oak (1 mile north), Primrose Hill (1 mile south-west) and Agar Town (1 mile south-east). We also work in nearby towns such as London (4 miles south-east), Kensington (4 miles south-west), Shoreditch (3 miles south-east), Walthamstow (6 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
Local landmarks in Kentish Town
Locally, jobs take us to homes and businesses close to Primrose Hill, Haverstock School and North Bridge House School and the streets around them. Nearby too are The Hawley Arms (less than half a mile south) and Vaughan Williams Memorial Library (0.5 miles south). There’s a railway station in Kentish Town itself: Kentish Town West station. A little further out are O2 Centre (1.6 miles west) and Montfichet's Tower (2.9 miles south-east). Not far away are The Long Water and Primrose Hill.