Greater London · England
Blackwall New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for homes and businesses in Blackwall and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- New-build shower sealant that has already split
- Cracked caulk along new skirting
- Joints pulling apart as timber shrinks
The process
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. It generally takes a few hours in a single home. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Blackwall. 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.
- 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.
Getting ready for the visit
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
New build mastic in Blackwall
Some new-home owners let the house settle before resealing. For small cosmetic gaps, that is reasonable, but a failed shower or bath seal shouldn’t wait. Typical jobs include gaps between new skirting and floors and sealant that never bonded to the surface, across show homes, bathrooms & en suites and plot handovers.
Much of London’s new housing is flats 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.
- Place
- Blackwall (E14, SE10, E16)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Different surfaces, different methods
Skirting and floors
New homes often develop a gap between skirting and floor. A flexible sealant closes it without cracking like caulk.
Kitchens
Worktops in new homes can move slightly as the house dries, which opens gaps along the back. A fresh flexible bead closes them.
Towns and villages near Blackwall
Also in Blackwall
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Ventilate bathrooms well, especially in the first year
- Keep pictures and emails about snagging items
- Avoid running a DIY bead over the old one
- Act quickly if a seal starts to leak
Keep pictures of the joints and any snagging correspondence with your builder. It’s useful if you need to raise other issues later.
Early snagging is easier snagging. Small faults turn into leaks if left.
Why act early in Blackwall
It often makes sense to do all the sealant items on a snagging list together. You get one visit and one clear quote for the lot. In a flat in Blackwall, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Doing several joints on one visit normally 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.
Why book with us
- We are fully insured
- Experience in homes, commercial sites and hotels
- Arbo and Everbuild products
- Colour picked to suit the job
Honest limits
Before you book, it’s worth knowing the limits too:
- A tray or bath that is not properly supported, until it’s fixed
- Leaks from pipes, valves or wastes, which need a plumber
- Settlement cracks that need a surveyor
If in doubt, call 0345 464 0079 or email us and we will say what we think.
Surfaces we seal
- Show homes
- Kitchens
- Bathrooms & en suites
- Skirting & floors
- Windows & doors
- Plot handovers
New build mastic around Blackwall
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or 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.
If you’ve bought a new home near Canary Wharf station, the sealant around baths, showers and frames is worth checking in the first year or two. Blackwall is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Blackwall is about 1 mile south-west of Canning Town, in Greater London. From the centre of Blackwall to the outskirts, we cover new build mastic for every kind of property, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, Blackwall among them.
Jobs for new build mastic in E14, SE10 and E16 works the same way as everywhere else we cover. If you need new build mastic at a property on Nutmeg Lane, Athol Square and Leamouth Road or anywhere close by, our applicators can take on the job. Being close to the A102 and A1206, Blackwall is simple for us to get to for new build mastic. Other places close to Blackwall include Coldharbour (1 mile south-west), Leamouth (1 mile north-east), Limmo Peninsula (1 mile north-east), Poplar (1 mile west) and London Docklands (1 mile west). Larger places within reach include London (4 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (9 miles west), St Pancras (5 miles west) and Shoreditch (3 miles north-west).
What’s near Blackwall
We work in homes and buildings around The Gun pub, Tower Hamlets College and Bow Creek Ecology Park, among other places. For rail, the closest station is Canary Wharf station, roughly 0.6 miles west. A little further out are Poplar Hospital (less than half a mile north-west) and London Gas Museum (1.1 miles north). Open spaces near Blackwall include Lavender Pond and Tower Hill.
How we quote for new build mastic
Your quote is based on your job. We take into account:
- How many areas need sealing
- Access and height
- Whether there’s mould to deal with
- How much there is to do
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, call 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
Photos help, but a description is a good start. Please mention:
- Whether it’s a home or a business
- The problem you’ve noticed
- How we’d reach the joints
- If someone has resealed it before
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear price before any work starts.
Blackwall: your questions answered
Can you do new build mastic in Blackwall?
Yes. Our work covers London and the South East, and Blackwall is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Can you help a landlord with a rental near Canary Wharf station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
My new home is still under warranty. Should I contact you?
Report it to the builder first while you are covered. Once that’s done, or if they will not put it right, we can reseal it properly.
What does new build mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or drop us an email and tell us what needs doing and where.
When is the sealant fully cured?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Where are you based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.