Greater London · England
New-build mastic & snagging in St Mary Cray, Greater London
Our applicators work in St Mary Cray on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Smeared, uneven beads picked up at snagging
- Cracks appearing as a new home settles
- Kitchen sealant that has pulled off the wall
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Wait for the cure time before using a resealed shower
- Use the extractor fan every time you shower
- Clean sealant with mild detergent, not abrasives
- Look at the sealant regularly in the first couple of years
Keep the bathroom ventilated, especially in the first year. Run the fan or open a window after bathing so moisture doesn’t sit on the sealant.
Mould takes hold quickly in sealant that has gaps or lifted edges. Resealing before mould gets in keeps the job straightforward.
New build mastic in St Mary Cray
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 since hurried prep is behind a lot of new-build failures. We work on bathrooms & en suites, windows & doors and plot handovers, and common reasons people get in touch are untidy sealant flagged on a snagging list and gaps between new skirting and floors.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement, in St Mary Cray as anywhere.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- St Mary Cray (BR5, BR6, BR7)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
DIY kits do not solve the main problems with new-build sealant: grit, unprimed surfaces and old layers underneath. Proper removal and preparation are what make it last. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in St Mary Cray, the repair is bigger than the sealant job would have been.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why us?
- White, clear, grey or coloured to suit, where the product allows
- Every job guaranteed for a year
- Trusted Arbo and Everbuild sealants
- 180+ five-star Google reviews
New homes and floors in St Mary Cray
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. 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.
St Mary Cray is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For new homes near St Mary Cray station, it’s worth checking the sealant early, while snags are still fresh.
St Mary Cray is about 11 miles south-east of London, in Greater London. St Mary Cray gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our Greater London coverage runs to 764 places, and St Mary Cray is one of them. There’s also a page for London, about 11 miles away.
Work in BR5, BR6 and BR7 is quoted and booked the same way as anywhere else. Whether your property is on New Road, Kent Road and Park Road or anywhere close by, we can help. With the A224 close by, St Mary Cray is easy for our applicators to reach. Other places close to St Mary Cray include Poverest (1 mile south-west), St Paul's Cray (1 mile north), Orpington (1 mile south), Derry Downs (1 mile south-east) and Kevington (1 mile east). Larger places within reach include London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north-west).
Near you in St Mary Cray
In St Mary Cray, that means homes and buildings near Harris Academy Orpington, The Blue Anchor Public House and Walsingham School, among other places. There’s a railway station in St Mary Cray itself: St Mary Cray station. Other landmarks nearby include London Borough of Bromley Museum (0.9 miles south) and Lullingstone Castle (4.5 miles south-east). Green spaces nearby include Summer Hill and The Warren.
Landlord and commercial work in St Mary Cray
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll give you a quote.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Surface by surface
Skirting and floors
New homes often develop a gap between skirting and floor. A flexible sealant closes it without cracking like caulk.
Bathrooms and en suites
En suite showers are a common source of leaks into the room below. A proper reseal keeps water in the tray.
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. It generally takes a few hours for most snagging lists, longer for a run of plots. In a London area like St Mary Cray, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- Each joint is checked for movement before we start.
- Old sealant is cut out and the joints cleaned.
- Joints are dried and primed where the product calls for it.
- Baths are filled with water, then the new sealant is applied.
- We check every joint and leave you with the cure times.
Preparing for the visit
- Let us know about earlier repairs to the joints
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
How to get a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Advice
Also near St Mary Cray
Other services in St Mary Cray
Common questions in St Mary Cray
Is St Mary Cray in your area for new build mastic?
Yes, St Mary Cray is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Is parking a problem for a job in St Mary Cray?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Is there any odour?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
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 they’re slow or the fix doesn’t last, we can help.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
Do you guarantee your work?
Yes. All our work carries a 12-month guarantee.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
When it is not the sealant
Sealant isn’t the answer to every problem, and we’ll tell you before any work starts. Sealant will not put right:
- Damaged fittings that need replacing
- Structural cracks in walls or ceilings
- Baths and trays that move too much for sealant to cope with
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Skirting & floors
- Kitchens
- Windows & doors
- Show homes
- Bathrooms & en suites
- Plot handovers
What affects the quote in St Mary Cray
Your quote is based on your job. We look at:
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Any mould that needs treating
- When we can work, for business premises
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email and we’ll talk you through it.
Helping us quote
To help us quote quickly, please include:
- Any access issues, like height or stairs
- A few photos by email, if you can
- What’s wrong with the joints now
- Whether it’s a home or a business
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.