Greater London · England
New-build mastic & snagging in Greenwich, Greater London
Problem with your new-build sealant joints in Greenwich? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Second-fix sealing on new plots
- Gaps between new skirting and floors
- Sealant that never bonded to the surface
How we handle new build mastic in Greenwich
Failed shower seals, gaps along the skirting and messy beads are common items on a new-home snagging list. If you are still within the builder’s snagging or warranty period, tell them first, and if it isn’t put right, get in touch with us. Typical jobs include joints pulling apart as timber shrinks and skirting joints opening in the first winter, on show homes, windows & doors and plot handovers.
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, in Greenwich and beyond.
Every job is covered by a one-year guarantee, wherever you are in Greater London.
- Where
- Greenwich (SE10, SE3, SE8)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take 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 Greenwich. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out down to clean surfaces.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
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Joints and finishes in Greenwich homes
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Greenwich is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Greenwich is about 4 miles east of London, in Greater London. Whether you are in the middle of Greenwich or further out, we cover new build mastic for every kind of property. Across Greater London, we cover 764 places, and Greenwich is one of them.
Jobs for new build mastic in SE10, SE3 and SE8 works the same way as everywhere else we cover. If you need new build mastic at a property on Cade Road, Webb Road and Creek Road or anywhere close by, we can help. Greenwich sits on or near the A2203 and A2211. We also cover the places around Greenwich: Maze Hill (1 mile north-east), Vanbrugh Park Estate (1 mile east), Blackheath (1 mile south-east), Westcombe Park (1 mile east) and Isle of Dogs (1 mile north-west). We also work in nearby towns such as London (4 miles west), City of Westminster (7 miles west), Marylebone (7 miles west), Kensington (9 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
What’s near Greenwich
In Greenwich, that means homes and buildings near The Plume of Feathers pub, John Roan School and Royal School of Naval Architecture and Marine Engineering and the streets around them. Nearby too are Island Gardens (0.6 miles north-west) and St. Paul's (1.1 miles west). There’s a railway station in Greenwich itself: Maze Hill station. Nearby you will also find Greenwich Castle (within half a mile south-west) and Greenwich District Hospital (0.5 miles north-east). The countryside around Greenwich includes Tower Hill and Creekside Discovery Centre.
How the job changes by surface
Bathrooms and en suites
New-build bathrooms and en suites are where sealant fails most often. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
Windows and doors
Draughts around new frames are often a sealant gap. We look at the joints and reseal where needed.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
Common questions in Greenwich
Do you cover Greenwich for new build mastic?
Yes, Greenwich is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Do you work for landlords with property near Maze Hill station?
Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. Then call 0345 464 0079 or drop us an email.
Do you guarantee your work?
Yes, for a year. If there’s a problem with our work in that time, tell us and we’ll put it right.
Who should fix failed sealant in a new build?
If you are still within the builder’s snagging or warranty period, report it to them first. If it is not sorted, or keeps failing, get in touch with us.
Do you have insurance?
Yes. We’re fully insured.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Places near Greenwich
What else we do in Greenwich
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Resist patching a failed seal with a tube from the DIY shop
- Don’t wait for the house to settle if water is getting through
- Check bath and shower seals every few months as the house settles
- Follow the cure time we give you
Clean the sealant with a mild detergent and a soft cloth. Avoid abrasive pads and strong solvents, which can damage the surface.
Lifting sealant traps moisture and mould behind it. Resealing before mould gets in keeps the job straightforward.
Why deal with it now?
If you are still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Greenwich, the repair is bigger than a sealant job.
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
Why Greenwich clients choose us
- 180+ five-star Google reviews
- We agree the colour with you first
- Tidy, careful work
- White, clear, grey or coloured to suit, where the product allows
Take a look at our cost guide or what customers say.
When to call us in Greenwich
New homes are full of moisture from plaster, screed and concrete, and it dries out over the first couple of years. As it does, timber shrinks and joints open.
Any of these means the joints need attention:
- Internal frame sealant that has split
- Gaps behind new kitchen upstands
- Skirting joints opening in the first winter
- Sealant work across a run of new homes
For new homes near Maze Hill station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- What happens if they find a problem under the old sealant
- What preparation is included
- What the cure time is
- How much experience the applicator has