Greater London · England
New-build mastic & snagging in South Croydon, Greater London
Professional new build mastic in and around South Croydon, with every bit of old sealant taken out first.
- Gaps behind new kitchen upstands
- Frame joints opening as the plaster dries
- Beads laid onto grit and dust from the build
When it isn’t the sealant
Before you book, it’s worth knowing the limits too:
- Baths and trays that move too much for sealant to cope with
- Settlement cracks that need a surveyor
- Leaking fittings rather than failed sealant
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Surfaces we seal
- Show homes
- Windows & doors
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Kitchens
New build mastic for homes and businesses in South Croydon
We carry out plot mastic and second-fix sealing for builders, and snagging reseals for new-home owners. Both get the same care over preparation. We work on windows & doors, bathrooms & en suites and skirting & floors, and common reasons people get in touch are messy sealant that spoils new finishes and second-fix sealing on new plots.
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, in South Croydon and beyond.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- South Croydon (CR2, CR8, CR0)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
What happens if it’s left?
The builder is normally the first port of call while the snagging or warranty period runs. If it keeps failing or is not 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 for homes in South Croydon.
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
Why choose Mr Mastic in South Croydon
- White, clear, grey or another colour, product permitting
- More than 20 years in sealant work
- Colour picked to suit the job
- Quality sealants from Arbo and Everbuild
Read what affects the cost and what customers say.
Different surfaces, different methods
Kitchens
Beside the sink, the joint takes water every day. A kitchen sealant goes in there, food-safe where it’s needed.
Bathrooms and en suites
Trays and baths in new builds settle as they’re used. The joint is stripped back before the new bead goes in.
How we quote for new build mastic
Your quote is based on your job. We take into account:
- Whether there’s mould to deal with
- The amount of work
- How easy the joints are to reach
- Any working-time requirements on site
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
What to tell us for a quote
What to tell us when you ask for a quote:
- A few pictures by email, if you can
- The problem you’ve noticed
- Roughly how big the job is
- The address or postcode of the job
For new build mastic in South Croydon, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
FAQs for South Croydon
Is parking a problem for a job in South Croydon?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you do new build mastic in South Croydon?
Yes, South Croydon is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you.
Do you use white or clear sealant?
That depends on what the joint meets: white or clear for most sanitary joints, colours for worktops, floors and frames. We agree the colour before work begins.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator.
Is there any odour?
Possibly a little. It fades as the sealant cures, and ventilation helps.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
Is it normal for sealant to crack in a new home?
Cracking in the first couple of years is common as timber and plaster dry out. Rushed application on dusty surfaces makes it worse.
New build mastic around South Croydon
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
As a London address, South Croydon can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
South Croydon is about 1 mile south of Croydon, in Greater London. South Croydon gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. We cover 764 towns and villages across Greater London, from the larger towns to small villages. For nearby work, see our London page (10 miles or so).
Every address in CR2, CR8 and CR0 is within our area for new build mastic. That includes homes and businesses on Edgar Road, Bynes Road and Grange Road and the roads around them. Nearby, we also carry out new build mastic in Croydon (1 mile north), Coombe (1 mile north-east), Sanderstead (1 mile south-east), Riddlesdown (2 miles south) and Selsdon (2 miles east). Within a short drive, we also cover London (10 miles north), City of Westminster (11 miles north), Marylebone (12 miles north), Kensington (11 miles north-west), St Pancras (12 miles north) and Shoreditch (12 miles north).
Around South Croydon
We work in homes and buildings around The Purley Arms, Harris Academy Purley and Duppas Hill and the streets around them. There’s a railway station in South Croydon itself: Sanderstead station. A little further out are Purley War Memorial Hospital (1.2 miles south-west) and Croydon Airport Visitor Centre (1 mile west). Green spaces nearby include Roundshaw Downs and Duppas Hill.
How the visit works
You don’t need to clear the whole room or building before we come, only the area right around the joints. Everything nearby is protected, and the job takes anything from a few hours to several days, depending on the number of plots in most cases. 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.
- Each joint is checked for movement before work begins.
- Old sealant is cut out and the joints cleaned.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Before we arrive
- Mention any tricky access
- Let us know about parking restrictions
- Move anything stored near the joints
Getting a quote
Need a quote? Please call 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before work begins.
Advice
Also near South Croydon
Other services in South Croydon
When to call us in South Croydon
On many sites, sealant goes on in the final rush before handover. Dusty, unprimed joints are common, and the sealant sits on grit instead of the surface.
Look out for any of the following:
- Gaps opening as the house dries out and settles
- New-build shower sealant that has already split
- Sealant applied over dusty or wet surfaces
- Kitchen sealant that has pulled off the wall
For new homes near Sanderstead station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- Is VAT in the price?
- How the joint is cleaned and prepared
- Who does the work, and how experienced they are
- What guarantee comes with the work