Greater London · England
Richmond upon Thames New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for homes and businesses in Richmond upon Thames and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps opening as the house dries out and settles
- Sealant applied over dusty or wet surfaces
- Sealant work across a run of new homes
How we handle new build mastic in Richmond upon Thames
New homes move as they dry out. Timber shrinks, plaster dries and baths and trays bed down, so sealant that was laid quickly before handover often cracks. We work on show homes, bathrooms & en suites and kitchens, and the jobs we see most are beads laid onto grit and dust from the build and internal frame sealant that has split.
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 failed shower seals, open skirting joints and gaps at thresholds are typical.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Place
- Richmond upon Thames (TW9, TW10, SW14, TW1)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
The work is kept neat and contained to the joints we are treating. Expect the work to take a few hours for most snagging lists, longer for a run of plots, and we tell you how long to leave it before we go. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we work through your snagging list or plot schedule with you.
- We cut out every bit of the failed or messy sealant.
- Surfaces are cleaned of building dust and primed where needed.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Finally, each room is checked and you are given the cure time.
How to prepare
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
- Clear items away from the joints we are working on
Get a quote
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.
Read more
Work for landlords, hotels and businesses
If you manage several properties in or around Richmond upon Thames, several properties can go on one quote. Send us the addresses and the work at each.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Quotes for new build mastic in Richmond upon Thames
We do not publish a price list, because jobs vary so much. What we look at:
- The amount of work
- Any mould that needs treating
- How easy the joints are to reach
- The old material and how stubborn it is
Doing several joints on one visit normally makes better use of the time than several visits. We will give you a clear price for the lot.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
There’s no standard price list, because every job is different. Instead, we give you a clear price for your job. To get started, ring 0345 464 0079 or send us an email.
Towns and villages near Richmond upon Thames
Also in Richmond upon Thames
Aftercare tips
So the new joints stay in good condition:
- Use the extractor fan every time you shower
- Raise failed sealant with the developer while you’re covered
- Act quickly if a seal starts to leak
- Clean sealant with mild detergent, not abrasives
Keep an eye on the joints over the first couple of years. Hairline gaps can open as timber and plaster dry.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small and the new finishes intact.
Richmond upon Thames questions
Is Richmond upon Thames in your area for new build mastic?
Yes. Our work covers London and the South East, and Richmond upon Thames is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing.
I let a flat near Richmond station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
What colour sealant will you use?
That depends on what the joint meets: white or clear for most sanitary joints, colours for worktops, floors and frames. We will agree it with you first.
How long does the job take?
As a guide, most jobs take anything from a few hours to several days, depending on the number of plots. Bigger jobs take longer.
Where are you based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Why has my new-build shower seal failed already?
There are normally two causes: movement as the house dries and settles, and sealant laid onto dust without primer. A proper reseal deals with both.
What should I tell you?
A short description and the location, plus pictures if you have them. We’ll ask anything else we need to know.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Leave it or put it right?
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it keeps failing or isn’t dealt with, we can reseal it properly. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- Rated 4.9 stars on Google
- More than 20 years in sealant work
- A choice of colours where the product allows
- Quality sealants from Arbo and Everbuild
Read our cost guide or what customers say.
What we’re called out for in Richmond upon Thames
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.
Look out for these signs:
- Beads laid onto grit and dust from the build
- Frame joints opening as the plaster dries
- Leaking shower tray seals in a new home
- Worktop and upstand sealant coming away
As a London address, Richmond upon Thames can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before you book
- Whether they’re fully insured
- Which colour the sealant will be
- When the joint can take water or movement
- The length of the guarantee
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Your warranty claim itself, which is between you and the builder
- Settlement cracks that need a surveyor
- Leaks from pipes, valves or wastes, which need a plumber
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before you book.
Where we work in Richmond upon Thames
- Windows & doors
- Plot handovers
- Show homes
- Kitchens
- Skirting & floors
- Bathrooms & en suites
New build mastic around Richmond upon Thames
Much of London’s new housing is flats in larger 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you’ve bought a new home near Richmond station, the sealant around baths, showers and frames is worth checking in the first year or two.
Richmond upon Thames is about 3 miles south of Ealing, in Greater London. Whether you’re in the middle of Richmond upon Thames or further out, we cover new build mastic for every kind of property. 764 places in Greater London are on our list, large and small. There’s also a page for London, roughly 9 miles from Richmond upon Thames.
Jobs for new build mastic in TW9, TW10, SW14 and TW1 works the same way as everywhere else we cover. New build mastic is available to properties on Church Road, King George Square and Topiary Square and the roads around them. Main roads around Richmond upon Thames include the B321 and B322. We also cover North Sheen (1 mile north-east), East Sheen (1 mile east), Mortlake (1 mile east), Kew (2 miles north-east) and Strand-on-the-Green (2 miles north-east). Larger places within reach include London (9 miles east), City of Westminster (7 miles north-east), Marylebone (8 miles north-east), Kensington (5 miles north-east), St Pancras (9 miles north-east) and Shoreditch (10 miles north-east).
Near you in Richmond upon Thames
Typical jobs here are in homes near Pesthouse Common, The White Horse Richmond pub and Kneller Hall Junior School. Richmond upon Thames has its own railway station: Richmond station. A little further out are Eel Pie Island Museum (1.5 miles south-west) and Treaty Centre (3 miles west). The countryside around Richmond upon Thames includes Duke's Hollow and Richmond Hill.