Greater London · England
New-build mastic & snagging in Thamesmead, Greater London
Specialist new build mastic for Thamesmead: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Beads laid onto grit and dust from the build
- New-build shower sealant that has already split
- Cracks appearing as a new home settles
About our new build mastic in Thamesmead
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. If you’re dealing with shower seals failing in the first year or two and gaps opening as the house dries out and settles, we can put it right, on plot handovers, show homes and kitchens alike.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, and new homes need their plot mastic finished properly before handover.
Every job comes with our one-year guarantee, wherever you are in Greater London.
- Where
- Thamesmead (SE28, SE2, DA18)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the number of plots, and the area is left clean. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Thamesmead. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- 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.
- Finally, each room is checked and you’re given the cure time.
Before we arrive
- Tell us if parking is tricky
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
Getting a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Related advice
How we quote for new build mastic
For a quick quote, just ask. What matters most is:
- Whether the work is at height
- How many rooms, windows or areas are involved
- The size of the job
- Mould in or behind the old joints
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and send you a clear quote before we start.
What to tell us for a quote
What to tell us when you ask for a quote:
- Whether it has been sealed before
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
If you are in Thamesmead and need new build mastic, ring 0345 464 0079 or send 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.
Landlord and commercial work in Thamesmead
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Landlords and agents in Thamesmead can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Places near Thamesmead
Other services in Thamesmead
Different surfaces, different methods
Windows and doors
The gap between a new frame and its plaster reveal often opens up. We cut out the cracked bead and reseal with a flexible sealant.
Skirting and floors
New homes often develop a gap between skirting and floor. A flexible sealant closes it without cracking like caulk.
Aftercare tips
Looking after new joints is easy:
- Wait for the cure time before using a resealed shower
- Resist patching a failed seal with a tube from the DIY shop
- Photograph failed sealant before it’s redone
- Avoid scourers and strong chemicals on sealant
Clean the sealant with a mild detergent and a soft cloth. Keep scourers and harsh chemicals off it.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak.
New build mastic around Thamesmead
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent.
Thamesmead is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Thamesmead is about 2 miles north-east of Plumstead, in Greater London. Every kind of property in Thamesmead is covered for new build mastic. Every job comes with our 12-month guarantee. Our Greater London coverage runs to 764 places, Thamesmead among them. Our London page covers work nearby (10 miles or so).
Our applicators cover all of SE28, SE2 and DA18 for new build mastic. Local streets include Attlee Road, Aisher Road and Carlyle Road, all of which we cover. We also cover the places around Thamesmead: Crossness (1 mile south-east), Dagenham Dock (1 mile north-east), Barking Riverside (1 mile north-west), Thames View Estate (2 miles north-west) and Hornchurch Marshes (2 miles north-east). Within a short drive, we also cover London (10 miles west), City of Westminster (12 miles west), Marylebone (12 miles west), Kensington (14 miles west), St Pancras (11 miles west) and Shoreditch (9 miles west).
What’s near Thamesmead
In Thamesmead, that means homes and buildings near Harris Garrard Academy and Abbey Wood Park, among other places. For rail, the closest station is Abbey Wood station, about 1 mile south. A little further out are Greenwich Borough Museum (1.7 miles south-west) and Gallions Reach Shopping Park (2 miles west). For a walk, there’s Crossness Nature Reserve.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
What we are called out for in Thamesmead
Not every new-build joint gets the right sealant: decorators’ caulk in a wet area, or a stiff sealant where there’s movement. Both fail early.
Keep an eye out for any of the following:
- Cracked caulk along new skirting
- New-build shower sealant that has already split
- Sealant work across a run of new homes
- Untidy sealant flagged on a snagging list
For new homes near Abbey Wood station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- What happens if the job turns out different
- What preparation is included
- What product goes in the joint
- Is VAT in the price?
Common questions in Thamesmead
Do you work for landlords with property near Abbey Wood station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Do you cover Thamesmead for new build mastic?
Yes. Our work covers London and the South East, and Thamesmead is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
My new home is still under warranty. Should I contact you?
Report it to the builder first while you are covered. If it is not resolved, we can reseal it properly.
Can you reseal over the builder’s sealant?
No. Sealing over old sealant looks fine for a few weeks, then lifts. We remove every bit of the old bead before resealing.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Can you do plot mastic on a new development?
Yes. We carry out plot mastic and second-fix sealing for builders and developers. Send us the plot schedule and we will quote.