Greater London · England
New-build mastic & snagging in Cannon Hill, Greater London
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Cannon Hill. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Plot mastic for developers ahead of handover
- Leaking shower tray seals in a new home
- Beads laid onto grit and dust from the build
How we handle new build mastic in Cannon Hill
For builders and developers, we work through plots to the schedule you give us. We seal bathrooms, kitchens, windows, doors and skirting so plots are ready to hand over using the right product for each joint. If you have sealant work across a run of new homes and shower seals failing in the first year or two, we can put it right.
Across London, commercial floors have movement joints that break down under heavy foot traffic, and new homes need their plot mastic finished properly before handover.
A one-year guarantee comes as standard, so you’re covered after we have gone.
- Place
- Cannon Hill (SW20, SM4, KT3)
- Region
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Leaks from pipes, valves or wastes, which need a plumber
- Disputes or warranty claims with your builder
- Structural cracks in walls or ceilings
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Show homes
- Bathrooms & en suites
- Skirting & floors
- Kitchens
- Windows & doors
- Plot handovers
Towns and villages near Cannon Hill
What else we do in Cannon Hill
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 clear up. It usually takes a few hours for most snagging lists, longer for a run of plots. In Cannon Hill, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Before we arrive
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, ring 0345 464 0079 or send us an email.
Read more
How the job changes by surface
Plot handovers
Taking time over preparation reduces return visits. Dust from the build is removed first.
Bathrooms and en suites
Shower trays in new homes often move slightly in the first year. The joint is stripped back before the new bead goes in and baths are filled before sealing.
Cannon Hill questions
Can you do new build mastic in Cannon Hill?
Yes. We work across London and the South East, and Cannon Hill is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Can you help a landlord with a rental near South Merton station?
Yes. We work for landlords and agents as well as homeowners. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Where are you based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
How long does new build mastic take?
It depends on the size of the job, but as a guide it takes a few hours for most snagging lists, longer for a run of plots. We’ll tell you when we quote.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
How do I get a quote for new build mastic in Cannon Hill?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or drop us an email with a short description of the job.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
What colour sealant will you use?
We use white, clear or a colour to suit the finishes. Let us know your preference when you ask for a quote.
Why it’s worth doing now in Cannon Hill
DIY kits don’t solve the main problems with new-build sealant: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in Cannon Hill.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Cannon Hill customers choose us
- Domestic, commercial and hotel work
- Full insurance on every job
- 20+ years of sealant experience
- An ARBOMaster approved applicator
Read what affects the cost and customer reviews.
What affects the cost of new build mastic
We don’t publish a price list, because jobs vary so much. What we look at:
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- The number and length of the joints
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
Before you ask for a quote, have a think about:
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- The type of property
Need a quote? Please call 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
We work for landlords and letting agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Photograph failed sealant before it’s redone
- Wait for the cure time before using a resealed shower
- Act quickly if a seal starts to leak
- Watch for new gaps as the house dries out
Follow the cure time we give you before the area gets wet. Silicone is usually left for about a day.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small and protects the rest of the house.
New homes and floors in Cannon Hill
Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent. 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.
As a London address, Cannon Hill can be tricky for parking: let us know about parking bays, permits or a driveway. If you’ve bought a new home near South Merton station, the sealant around baths, showers and frames is worth checking in the first year or two.
Cannon Hill is about 1 mile north-west of Morden, in Greater London. Homes, rented property, offices and hotels in Cannon Hill is covered for new build mastic. The work is guaranteed for a year. We cover 764 towns and villages across Greater London, from the larger towns to small villages. There’s also a page for London, about 9 miles away.
Work in SW20, SM4 and KT3 is quoted and booked the same way as anywhere else. New build mastic is available to properties on Aylward Road, Camborne Road and Botsford Road and the roads around them. If you are just outside Cannon Hill, we cover Bushey Mead (1 mile north-west), Raynes Park (1 mile west), Wimbledon Chase (1 mile north), West Barnes (1 mile west) and Merton Park (1 mile north-east). Within a short drive, we also cover London (9 miles north-east), City of Westminster (8 miles north), Marylebone (9 miles north), Kensington (7 miles north), St Pancras (10 miles north-east) and Shoreditch (11 miles north-east).
Around Cannon Hill
In Cannon Hill, that means homes and buildings near The Edward Rayne pub, Cannon Hill Common and Harris Academy Wimbledon, among other places. For rail, the closest station is South Merton station, roughly 0.5 miles north-east. Nearby you will also find St. Anthony's Hospital (1.5 miles south) and Wimbledon Museum (1.6 miles north). The countryside around Cannon Hill includes Cherry Wood and Henman Hill.