Greater London · England
Leaves Green New Build Mastic
Problem with your new-build sealant joints in Leaves Green? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Joints pulling apart as timber shrinks
- New-build shower sealant that has already split
- Frame joints opening as the plaster dries
New build mastic in Leaves Green
A new house keeps drying out and settling for its first couple of years. Timber dries and shrinks, and baths and trays settle, so sealant that was laid quickly before handover often cracks. We work on skirting & floors, windows & doors and show homes, and people most often call us about joints pulling apart as timber shrinks and gaps between new skirting and floors.
London homes range from new-build flats to period conversions with new floors laid over old boards. Every joint between floor, skirting and threshold has to cope with some movement, in Leaves Green as anywhere.
We stand behind the work with a one-year guarantee, so you’re covered after we have gone.
- Place
- Leaves Green (BR2)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Leaves Green
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Leaves Green, the repair is bigger than a sealant job.
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
What you get with us
- Rated 4.9 stars on Google
- An ARBOMaster approved applicator
- 12-month guarantee on every job
- Colour picked to suit the job
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Towns and villages near Leaves Green
More services for Leaves Green
Different surfaces, different methods
Show homes
Show homes need sealant that looks right from day one. Every bead is neat and coloured to suit the room.
Bathrooms and en suites
En suite seals are easy to miss on a snagging list until they leak. A proper reseal keeps water in the tray.
New build mastic around Leaves Green
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
Leaves Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Leaves Green is about 4 miles south of Bromley, in Greater London. Every kind of property in Leaves Green is covered for new build mastic. Every job comes with our one-year guarantee. Across Greater London, we cover 764 places, Leaves Green among them. We also work in London, around 12 miles away.
Jobs for new build mastic in BR2 is quoted and booked the same way as anywhere else. We cover properties on Ashmore Lane and Main Road and the roads around them. If you’re just outside Leaves Green, we cover Farthing Street (1 mile north-east), Downe (1 mile east), Nash (1 mile north-west), Luxted (1 mile south-east) and Keston (2 miles north). Within a short drive, we also cover London (12 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (14 miles north).
Landmarks near Leaves Green
We work in homes and buildings around The Kings Arms and South Park. The nearest railway station is Hayes (Kent) station, roughly 2.8 miles north of the centre. Other landmarks nearby include Bethlem Museum of the Mind (3 miles north) and Princess Royal University Hospital (2.2 miles north-east). For a walk, there’s Nore Hill and West Kent Golf Course nature reserve.
What we’re called out for in Leaves Green
New homes are full of moisture from plaster, screed and concrete, which takes a year or two to dry out. As it does, timber shrinks and joints open.
These are the problems we’re asked about most:
- Frame joints opening as the plaster dries
- Second-fix sealing on new plots
- Skirting joints opening in the first winter
- Gaps behind new kitchen upstands
For new homes near Hayes (Kent) station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- What happens if the job turns out different
- Whether you can choose the colour
- Is the old sealant removed completely?
- When the joint can take water or movement
Landlords, agents and businesses in Leaves Green
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.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Leaves Green: your questions answered
Do you cover Leaves Green for new build mastic?
Yes, Leaves Green is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear quote.
Do you work for landlords with property near Hayes (Kent) station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Where do you work from?
We work from Crawley. We cover Leaves Green and the rest of Greater London.
Are you insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Will there be a smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Is it normal for sealant to crack in a new home?
A new house dries and settles for a year or two, and sealant is often applied quickly onto dusty surfaces. Either can make it fail early.
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to several days, depending on the number of plots and we leave things clean and tidy. For a job in Leaves Green, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- First we work through your snagging list or plot schedule with you.
- The old bead comes out in full, with no layer left behind.
- 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’re given the cure time.
Getting ready for the visit
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
Ask for a quote
Want a quote for new build mastic? Please phone 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
How we quote for new build mastic
For a quick quote, just ask. The main things that affect it are:
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- Any mould that needs treating
- The number and length of the joints
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and send you a clear quote before work begins.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- The rough size of the job
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.