Greater London · England
New Malden New Build Mastic
New build mastic across New Malden and nearby, with old sealant always removed completely.
- Worktop and upstand sealant coming away
- Cracks appearing as a new home settles
- Beads laid onto grit and dust from the build
The process
We bring everything the job needs with us. After a quick look at the joints together, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the number of plots. In New Malden, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- Each joint is checked for movement before we start.
- We remove the failed sealant and clean the joints.
- 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.
How to prepare
- Clear the area around the work
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
Get a quote
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job.
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New build mastic in New Malden
If your new home has a leaking shower seal, open skirting joints or untidy sealant, we can help. If you are still within the builder’s snagging or warranty period, tell them first and if that stalls, we can do it. If you’re dealing with shower seals failing in the first year or two and smeared, uneven beads picked up at snagging, we can help.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, while new homes need a neat, sound finish around frames, baths and kitchens before handover.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- New Malden (KT3, KT1, SW20)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
FAQs for New Malden
I let a flat near New Malden station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Is parking an issue for new build mastic in New Malden?
Parking in New Malden, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Who should fix failed sealant in a new build?
Report it to the builder first while you are covered. Once that’s done, or if they won’t put it right, we can reseal it properly.
When is the sealant fully cured?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Do you take on second-fix sealing for builders?
Yes. We work through plots to your schedule. Get in touch with the number of plots and the scope and we’ll quote.
Should I wait before resealing?
That depends on the joint. Failed seals in wet areas need doing now, while small cosmetic gaps can wait a while.
How long does the job take?
It depends on the size of the job, but as a guide it takes anything from a few hours to several days, depending on the number of plots. We’ll tell you when we quote.
Honest limits
We’d rather tell you now than do work that won’t last, so these are the limits:
- Disputes or warranty claims with your builder
- Leaking fittings rather than failed sealant
- Movement caused by a poorly fitted tray or bath
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Plot handovers
- Windows & doors
- Kitchens
- Skirting & floors
- Bathrooms & en suites
- Show homes
Towns and villages near New Malden
More services for New Malden
How we quote for new build mastic
You will get a clear quote before work begins. It takes into account:
- The number of rooms or windows
- The old material and how stubborn it is
- Mould in or behind the old joints
- Which sealant suits the joint
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
To make quoting easier, let us know:
- Where the property is
- Roughly how big the job is
- If someone has resealed it before
- Access, such as stairs, a lift or height
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or send us an email.
What we are called out for in New Malden
Sealant applied onto damp surfaces does not bond well. On a busy site, joints aren’t always given time to dry.
If you can see any of these, it’s time to have the joints looked at:
- New-build shower sealant that has already split
- Smeared, uneven beads picked up at snagging
- Beads laid onto grit and dust from the build
- Kitchen sealant that has pulled off the wall
New Malden is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- What preparation is included
- What product goes in the joint
- Are they insured?
- Who does the work, and how experienced they are
New homes and floors in New Malden
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
If you’ve bought a new home near New Malden station, the sealant around baths, showers and frames is worth checking in the first year or two.
New Malden is about 3 miles south-west of Wimbledon, in Greater London. Every kind of property in New Malden is covered for new build mastic, old or new, large or small. Every job comes with our one-year guarantee. New Malden is one of 764 towns and villages in Greater London where we work for new build mastic. There’s also a page for London, roughly 10 miles from New Malden.
Every address in KT3, KT1 and SW20 is covered for new build mastic, from the main roads to the quietest streets. If you need new build mastic at a property on High Street, Ashcombe Square and Melrose Gardens or anywhere close by, we can help. New Malden sits on or near the B283, so getting to you is simple. If you are just outside New Malden, we cover Motspur Park (1 mile north-east), West Barnes (1 mile east), Norbiton (1 mile north-west), Coombe (1 mile north) and Raynes Park (1 mile east). Further out, we also cover London (10 miles north-east), City of Westminster (9 miles north-east), Marylebone (9 miles north-east), Kensington (7 miles north), St Pancras (11 miles north-east) and Shoreditch (12 miles north-east).
What’s near New Malden
Typical jobs here are in homes near Beverley Park, The Glasshouse pub and Holy Cross School and the streets around them. There’s a railway station in New Malden itself: New Malden station. Well-known places in the area include Chessington Castle Hill (3.3 miles south) and Bentall Centre (1.9 miles west). Open spaces near New Malden include Rose Walk and Kingston Hill Road area.
Why deal with it now?
The builder is normally the first port of call while the snagging or warranty period runs. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why book with us
- Colour picked to suit the job
- Any old sealant cut out fully, not covered over
- Every job guaranteed for a year
- Experience in homes, commercial sites and hotels
See our cost guide and our reviews.
For landlords and businesses
We also work for property managers and facilities teams in New Malden and across Greater London. Several sites can go on one quote, and we are fully insured for the work.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.