Greater London · England
Carshalton New Build Mastic
Our applicators work in Carshalton on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Sealant work across a run of new homes
- Joints pulling apart as timber shrinks
- Shower seals failing in the first year or two
What sealant work can’t fix
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Cracked trays, tiles or worktops
- Your warranty claim itself, which is between you and the builder
- Leaks from pipes, valves or wastes, which need a plumber
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Windows & doors
- Show homes
- Plot handovers
- Skirting & floors
- Bathrooms & en suites
- Kitchens
New build mastic for homes and businesses in Carshalton
Across Carshalton, we work for both new-home owners and the builders handing those homes over. Whether it’s one en suite or a run of plots, the method is the same: cut out, clean, prime where needed and reseal neatly. Typical jobs include skirting joints opening in the first winter and sealant that never bonded to the surface, across kitchens, show homes and bathrooms & en suites.
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 Carshalton and beyond.
Whatever the size of the job, you get the same 12-month guarantee.
- Location
- Carshalton (SM5, SM1, SM6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Plot handovers
Plot mastic is carried out to the developer’s schedule. Joints are prepared properly before sealing to keep callbacks down.
Kitchens
As a new house dries, worktops and walls shift a little, which opens gaps along the back. A fresh flexible bead closes them.
How the visit works
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for most snagging lists, longer for a run of plots. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Getting ready for the visit
- Tell us if parking is tricky
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
Getting a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will talk you through the work and give you a clear quote.
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Your questions about new build mastic in Carshalton
Do you cover Carshalton for new build mastic?
Yes, Carshalton is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Carshalton station?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Where are you based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Can you work from my snagging list?
Yes. Snagging lists are a common starting point for us. We agree the sealant items with you before any work starts.
How long should I leave it?
Cure times vary by product and the conditions. We tell you how long to leave it before we go.
Should I wait before resealing?
It depends on whether water is getting through. Failed seals in wet areas need doing now, while small cosmetic gaps can wait a while.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit.
What affects the cost of new build mastic
Your quote is based on your job. We look at:
- How many rooms, windows or areas are involved
- The number and length of the joints
- When we can work, for business premises
- Access and height
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- The type of property
- Access, such as stairs, a lift or height
- The rough size of the job
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
Can I do it myself?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
What new build mastic looks like in Carshalton
The South East is one of the drier parts of the UK, 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 snags may need reporting through the developer or the managing agent.
For new homes near Carshalton station, it’s worth checking the sealant early, while snags are still fresh. As a London address, Carshalton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Carshalton is about 4 miles south-east of Wimbledon, in Greater London. Homes, rented property, offices and hotels in Carshalton can book us for new build mastic, old or new, large or small. Every job comes with our one-year guarantee. Our area takes in 764 places across Greater London, large and small. We also work in London, about 10 miles from Carshalton.
Jobs for new build mastic in SM5, SM1 and SM6 works the same way as everywhere else we cover. Streets in the area include Station Road, High Street and The Square, all of which we cover. Carshalton is on the B277 and B278, which makes it straightforward to reach. Other places close to Carshalton include The Wrythe (1 mile north), Wallington (1 mile east), St Helier (1 mile north-west), Rosehill (1 mile north-west) and Benhilton (1 mile west). Larger places within reach include London (10 miles north), City of Westminster (10 miles north), Marylebone (10 miles north), Kensington (9 miles north), St Pancras (11 miles north) and Shoreditch (12 miles north).
Local landmarks in Carshalton
In Carshalton, that means homes and buildings near The Railway Tavern, Carshalton Park and Sutton College of Learning for Adults. Carshalton has its own railway station: Carshalton station. Other landmarks nearby include St Helier Hospital (1 mile north-west) and Centrale Croydon (2.9 miles east). Not far away are Duppas Hill and Sutton Ecology Centre Grounds.
Landlord and commercial work in Carshalton
If you manage several properties in or around Carshalton, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Also near Carshalton
Also in Carshalton
Aftercare tips
So the new joints stay in good condition:
- Wipe joints with warm soapy water
- Use the extractor fan every time you shower
- Watch for new gaps as the house dries out
- Keep pictures and emails about snagging items
Follow the cure time we give you before the area gets wet. Silicone is normally left for about a day.
A seal that splits early is often a sign of movement. Getting it resealed properly, and any movement checked, stops it recurring.