Greater London · England
New-build mastic & snagging in Coldharbour, Greater London
Plot mastic for developers and snagging failed sealant in new homes for homes and businesses in Coldharbour and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Second-fix sealing on new plots
- Gaps between new skirting and floors
- Beads laid onto grit and dust from the build
About our new build mastic in Coldharbour
In a new home, every joint should have a clean, even bead. Smeared, patchy or cracked sealant is worth sorting early, before water gets into the floor or walls. We work on plot handovers, skirting & floors and show homes, and people most often call us about untidy sealant flagged on a snagging list and cracked caulk along new skirting.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement, in Coldharbour as anywhere.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Coldharbour (E14, SE10, E22)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.
Quotes for new build mastic in Coldharbour
Every job gets its own quote. These are the things that affect it:
- How many areas need sealing
- Access and height
- Which sealant suits the joint
- Working hours on commercial sites
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Helping us quote
What to tell us when you ask for a quote:
- Photos by email, if that’s easy
- Whether it’s a home or a business
- The rough size of the job
- If someone has resealed it before
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and give you a clear quote.
Coldharbour: your questions answered
Do you cover Coldharbour for new build mastic?
Yes, Coldharbour is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
I let a flat near Canary Wharf station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Do you take on second-fix sealing for builders?
Yes. Second-fix sealing in bathrooms, kitchens, frames and floors is part of what we do. Good preparation keeps snagging to a minimum.
Is it worth resealing while the house is still settling?
Where water is getting through, don’t wait. Hairline cosmetic gaps can wait until the house has settled.
How long does the job take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the number of plots. We’ll tell you when we quote.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Common problems we fix in Coldharbour
Later trades and the final clean can damage fresh sealant. If it’s disturbed before curing, the joint can be left weak, and the problem shows up after you move in.
Common reasons people contact us include:
- Worktop and upstand sealant coming away
- Beads laid onto grit and dust from the build
- Plot mastic for developers ahead of handover
- Cracks appearing as a new home settles
For new homes near Canary Wharf station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- Whether you can choose the colour
- What the quote includes, VAT included or not
- What product goes in the joint
- What happens if the job turns out different
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the number of plots and we leave things clean and tidy. For a job in Coldharbour, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We go through the snagging list or plot schedule and agree the joints to do.
- The old bead comes out in full, with no layer left behind.
- Each joint is cleaned of dust and grit, then primed if required.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Before we arrive
- Clear items away from the joints we’re working on
- Mention any sign-in or site rules at work premises
- Let us know about parking restrictions
Getting a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or send us an email.
Read more
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Structural cracks in walls or ceilings
- Deciding who is responsible under a builder’s warranty
- Broken tiles or a split tray
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before booking.
What we seal
- Kitchens
- Bathrooms & en suites
- Show homes
- Plot handovers
- Skirting & floors
- Windows & doors
New build mastic around Coldharbour
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent.
Coldharbour is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Coldharbour is about 2 miles north of Greenwich, in Greater London. For new build mastic in and around Coldharbour, please call 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base, Coldharbour included. Our Greater London coverage runs to 764 places, Coldharbour among them.
Jobs for new build mastic in E14, SE10 and E22 works the same way as everywhere else we cover. Whether your property is on Canada Square, Simpson's Road and Amsterdam Road or a nearby road, our applicators can take on the job. Main roads around Coldharbour include the A1206 and A1261. We also cover the places around Coldharbour: Blackwall (1 mile north-east), London Docklands (1 mile west), Poplar (1 mile north-west), Canary Wharf (1 mile west) and Heron Quays (1 mile west). Within a short drive, we also cover London (4 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (5 miles west) and Shoreditch (3 miles north-west).
Local landmarks in Coldharbour
We work in homes and buildings around Canary Wharf College 3, Mudchute Park and Farm and Tower Hamlets College. The closest station to Coldharbour is Canary Wharf station, roughly 0.5 miles north-west. Well-known places in the area include Old Royal Naval College (1.3 miles south) and Poplar Hospital (0.6 miles north). Not far away are Tower Hill and Lavender Pond.
Also near Coldharbour
More services for Coldharbour
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Surface by surface
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.
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Each joint is cleaned and primed where needed so the sealant lasts.