Greater London · England
New-build mastic & snagging in Thornton Heath, Greater London
Professional new build mastic in and around Thornton Heath, with every bit of old sealant taken out first and a 12-month guarantee.
- Smeared, uneven beads picked up at snagging
- Frame joints opening as the plaster dries
- Joints pulling apart as timber shrinks
About our new build mastic in Thornton Heath
Some owners wait for the first year’s movement before having joints redone. That makes sense for small gaps that are just cosmetic, but a seal that’s letting water through needs doing now. If you are dealing with kitchen sealant that has pulled off the wall and internal frame sealant that has split, we can put it right, whatever the surface.
New flats are going up across London, many of them 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.
We stand behind the work with a 12-month guarantee, so you’re covered after we’ve gone.
- Where
- Thornton Heath (CR7, SW16, SE25)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work can’t fix
We won’t take on work that will not last, so these are the limits:
- Baths and trays that move too much for sealant to cope with
- Your warranty claim itself, which is between you and the builder
- Leaking fittings rather than failed sealant
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Surfaces we seal
- Skirting & floors
- Plot handovers
- Kitchens
- Show homes
- Bathrooms & en suites
- Windows & doors
New homes and floors in Thornton Heath
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
Thornton Heath is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you’ve bought a new home near Thornton Heath station, the sealant around baths, showers and frames is worth checking in the first year or two.
Thornton Heath is about 7 miles south of London, in Greater London. We provide new build mastic to homeowners, landlords and businesses in Thornton Heath and the surrounding area, as part of our work across Greater London. Our Greater London coverage runs to 764 places, and Thornton Heath is one of them. You can also see our page for London, about 7 miles away.
Here we cover the CR7, SW16 and SE25 postcode area for new build mastic. We cover properties on Ena Road, Elm Road and Mayo Road and the roads around them. With the A23 and A212 close by, Thornton Heath is simple for us to get to for new build mastic. Nearby, we also carry out new build mastic in Norbury (1 mile north), Pollards Hill (1 mile north), Mitcham (2 miles west), Hackbridge (2 miles west) and Eastfields (2 miles west). Further out, we also cover London (7 miles north), City of Westminster (8 miles north), Marylebone (8 miles north), Kensington (8 miles north-west), St Pancras (9 miles north) and Shoreditch (9 miles north).
Near you in Thornton Heath
In Thornton Heath, that means homes and buildings near The Archbishop Lanfranc School, Prince George pub and Grangewood Park. Thornton Heath has its own railway station: Thornton Heath station. Well-known places in the area include Centrale Croydon (1.7 miles south) and Croydon University Hospital (0.7 miles south). Open spaces near Thornton Heath include Biggin Wood and Duppas Hill.
Leave it or put it right?
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time, and they’re avoidable with good preparation. 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. Putting it right early is much less trouble for homes in Thornton Heath.
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. You’ll have a clear quote before any work starts.
Why book with us
- An ARBOMaster approved applicator
- 12-month guarantee on every job
- Domestic, commercial and hotel work
- Rated 4.9 stars on Google
Read how sealant jobs are priced or our reviews.
Thornton Heath: your questions answered
Can you help a landlord with a rental near Thornton Heath station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is parking an issue for new build mastic in Thornton Heath?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
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 will tell you when we quote.
Do you cover Thornton Heath?
We do. Thornton Heath is part of the area we cover, and the service is the same as everywhere else.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
How long should I leave it?
Cure times vary by product. We tell you how long to leave it before we go.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can I add another job to the visit?
Yes, we can. More than one area can be quoted together.
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
If you are set on DIY, put the effort into 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.
For landlords 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 12-month guarantee.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Also near Thornton Heath
More services for Thornton Heath
What the job involves on each surface
Bathrooms and en suites
En suite seals are easy to miss on a snagging list until they leak. Resealing properly keeps water where it belongs.
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. It’s resealed with an exterior sealant suited to the frame and wall.
What affects the quote in Thornton Heath
You will get a clear quote before we start. It takes into account:
- Which sealant suits the joint
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Helping us quote
When you call or email, it’s useful to know:
- Any previous sealing or DIY work
- The rough size of the job
- Any access issues, like height or stairs
- A few pictures by email, if you can
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
What happens on the day
You don’t need to clear the whole room or building, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to several days, depending on the number of plots in most cases. In Thornton Heath, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- The failed sealant is removed completely down to clean surfaces.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
Before we arrive
- Try not to wet indoor joints just before the visit
- Clear the area around the work
- Tell us if parking is tricky
Ask for a quote
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.