Greater London · England
New Addington New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for New Addington, backed by a 12-month guarantee. Ask us for a quote.
- Gaps behind new kitchen upstands
- Joints pulling apart as timber shrinks
- Shower seals failing in the first year or two
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
New build mastic in New Addington, done properly
In a new home, every joint should have a clean, even bead. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water reaches anything behind it. We work on kitchens, skirting & floors and bathrooms & en suites, and the jobs we see most are shower seals failing in the first year or two and cracked sealant around new window and door frames.
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 shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- New Addington (CR0, CR9)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
When we arrive, we look over the joints with you first. We protect the surfaces around the joints before any work begins. Most jobs take a few hours in a single home. 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.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Before we arrive
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
- Clear the area around the work
Getting a quote
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
New homes and floors in New Addington
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. Rainfall in the South East is lower than in much 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 Hayes (Kent) station, the sealant around baths, showers and frames is worth checking in the first year or two. As a London address, New Addington can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
New Addington is about 4 miles south-east of Croydon, in Greater London. We carry out new build mastic for homes and businesses in New Addington. New Addington is one of 764 places in Greater London where we work. You can also see our page for London, roughly 11 miles from New Addington.
We work across the CR0 and CR9 postcode area for new build mastic and the streets around it. We cover properties on Bothwell Road, Windham Avenue and Gascoigne Road. We also cover the places around New Addington: Forestdale (1 mile west), Fickleshole (1 mile south), Addington (1 mile north-west), Farleigh (1 mile south-west) and Selsdon (2 miles west). Within a short drive, we also cover London (11 miles north), City of Westminster (13 miles north-west), Marylebone (13 miles north-west), Kensington (14 miles north-west), St Pancras (13 miles north) and Shoreditch (13 miles north).
Around New Addington
In New Addington, that means homes and buildings near Meridian High School and Addington Vale and the streets around them. New Addington’s nearest station is Hayes (Kent) station, roughly 2.6 miles north-east of the centre. Well-known places in the area include Warlingham Park Hospital (1.8 miles south) and Bethlem Museum of the Mind (3.3 miles north-east). Not far away are Nore Hill and Hutchinson's Bank.
Leave it or put it right?
Small cosmetic gaps can wait for the house to settle, but a leaking seal cannot. Not sure whether yours can wait? You can call 0345 464 0079 or send us an email with a few pictures. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- We agree the colour with you first
- White, clear, grey or another colour, product permitting
- Neat joints and a tidy finish
- Every job guaranteed for a year
See how sealant jobs are priced and our reviews.
FAQs for New Addington
Can parking be tricky for a visit in New Addington?
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.
Can you help a landlord with a rental near Hayes (Kent) station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you take on second-fix sealing for builders?
Yes. We seal plots to the developer’s programme, room by room. Tell us the plots and the joints involved and we’ll quote.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses, and we’re fully insured.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we’re done.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
When it is not the sealant
It helps to know what we can’t do too:
- Structural cracks in walls or ceilings
- Leaks from pipes, valves or wastes, which need a plumber
- Deciding who is responsible under a builder’s warranty
If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Windows & doors
- Skirting & floors
- Show homes
- Kitchens
- Plot handovers
- Bathrooms & en suites
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Photograph failed sealant before it’s redone
- Get a leaking seal dealt with right away
- Report sealant problems to your builder during the snagging period
- Keep water off fresh sealant until it has cured
Watch the joints as the house settles. Hairline gaps can open as timber and plaster dry.
If a shower tray or bath seal splits in the first year, look for movement. Getting it resealed properly, and any movement checked, stops it recurring.
Nearby places to New Addington
More services for New Addington
Surface by surface
Skirting and floors
New homes often develop a gap between skirting and floor. We seal it with a flexible sealant that copes with the movement.
Windows and doors
Draughts around new frames are often a sealant gap. We check and reseal the frame edges.