Greater London · England
New-build mastic & snagging in Southfields, Greater London
Professional new build mastic in and around Southfields, with every bit of old sealant taken out first and a 12-month guarantee.
- Joints pulling apart as timber shrinks
- Messy sealant that spoils new finishes
- Frame joints opening as the plaster dries
New build mastic for homes and businesses in Southfields
Dust is the enemy of new-build sealant. Each joint is cleaned of dust and primed where the product calls for it, so the sealant actually sticks instead of bonding to the dust. If you are dealing with internal frame sealant that has split and cracks appearing as a new home settles, we can put it right, whatever the surface.
Much of London’s new housing is flats in larger developments. Snagging there often goes through the developer or managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
All of our work is guaranteed for twelve months.
- Location
- Southfields (SW18, SW19, SW17)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Southfields: your questions answered
Can parking be tricky for a visit in Southfields?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you work for landlords with property near Earlsfield station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Will you just run a new bead over the existing one?
No. The old sealant is cut out fully, then clean and prime the joint, before resealing.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Are you insured?
Yes. We’re fully insured for every job we do.
Who should fix failed sealant in a new build?
Start with the builder if you are in the snagging or warranty period. If it is not resolved, we’ll cut it out and reseal it.
How long will you be here?
Typically it takes anything from a few hours to several days, depending on the number of plots. Larger jobs naturally take longer, and we will say how long yours will take.
Quotes for new build mastic in Southfields
For a quick quote, just ask. What matters most is:
- Access and height
- How many rooms, windows or areas are involved
- When we can work, for business premises
- The type of sealant required
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start, so you know where you stand.
Helping us quote
When you contact us, it’s useful to know:
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
- Where the property is
Every job is quoted individually. Just call 0345 464 0079 or send us an email with the details and send pictures if you have them.
When something else is needed
In fairness, some problems need a different trade:
- Baths and trays that move too much for sealant to cope with
- Disputes or warranty claims with your builder
- Settlement cracks that need a surveyor
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Where we work in Southfields
- Show homes
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Windows & doors
- Kitchens
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
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 new build mastic looks like in Southfields
Many of London’s new homes are flats in bigger 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.
As a London address, Southfields can be tricky for parking: let us know about parking bays, permits or a driveway.
Southfields is about 2 miles north-east of Wimbledon, in Greater London. We carry out new build mastic for homes and businesses in Southfields and the surrounding area. Our area takes in 764 places across Greater London. You can also see our page for London, about 6 miles away.
Work in SW18, SW19 and SW17 is quoted and booked the same way as anywhere else. New build mastic is available to properties on Burr Road, Acuba Road and Mount Road. We also cover the places around Southfields: Earlsfield (1 mile south-east), Wandsworth (1 mile north), Summerstown (1 mile south), Battersea (2 miles north-east) and Clapham Junction (2 miles north-east). We also work in nearby towns such as London (6 miles north-east), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (4 miles north), St Pancras (6 miles north-east) and Shoreditch (7 miles north-east).
What’s near Southfields
Locally, jobs take us to homes and businesses close to Old Sergeant pub, Southfields Academy and Wandsworth School and the streets around them. There’s a railway station in Southfields itself: Earlsfield station. Nearby you’ll also find Royal Hospital for Neuro-disability (1 mile west) and Wimbledon Lawn Tennis Museum (1.2 miles south-west). Open spaces near Southfields include Henman Hill and Wandle Meadow Nature Park.
Signs you need new build mastic in Southfields
Once people move in, baths and trays take weight and bed down. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used.
The most common problems we see are:
- Beads laid onto grit and dust from the build
- New-build shower sealant that has already split
- Kitchen sealant that has pulled off the wall
- Gaps opening as the house dries out and settles
If you’ve bought a new home near Earlsfield station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- Are they insured?
- How hidden problems are handled
- Who turns up on the day
- What the cure time is
Landlords, agents and businesses in Southfields
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.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Places near Southfields
Also in Southfields
How the visit works
On the day, we start by going over the job with you. Surfaces next to the work are protected before any work begins. The work normally takes a few hours for most snagging lists, longer for a run of plots. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Southfields. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each joint is checked for movement before we start.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
How to prepare
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
- Clear items away from the joints we are working on
Getting a quote
We don’t publish a price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or email us.
Advice
What the job involves on each surface
Show homes
Tired or marked sealant in a show home can be renewed. The old bead comes out and a clean new one goes in.
Plot handovers
Send us the schedule and any sealant specification and we’ll quote. Sealant work across the plot is covered.