Greater London · England
New Build Mastic in West Brompton
Plot mastic for developers and snagging failed sealant in new homes in West Brompton, with a one-year guarantee on every job. Call for a quick quote.
- Cracks appearing as a new home settles
- Gaps behind new kitchen upstands
- Sealant that never bonded to the surface
New build mastic for homes and businesses in West Brompton
A new build should have a neat, sound bead at every joint. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water reaches anything behind it. We work on windows & doors, plot handovers and bathrooms & en suites, and the jobs we see most are joints pulling apart as timber shrinks and messy sealant that spoils new finishes.
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, in West Brompton and everywhere else we cover.
- Where
- West Brompton (SW6, SW10, SW5)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in West Brompton
Do you cover West Brompton for new build mastic?
Yes, West Brompton is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Can parking be tricky for a visit in West Brompton?
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.
Do you work for developers?
Yes. We take on second-fix sealant work across new plots. We clean and prime joints properly to keep callbacks down.
Can tenants book the work?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Should I go to my builder first?
Start with your builder while their snagging or warranty period runs. If that does not work out, we’re happy to quote.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area.
Can you reseal over the builder’s sealant?
No. Fresh silicone doesn’t stick to the old layer, so sealing over the top fails quickly. We cut the old bead out completely.
Why does sealant fail so quickly in new builds?
There are usually two causes: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
Towns and villages near West Brompton
Also in West Brompton
What new build mastic looks like in West Brompton
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent.
West Brompton is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
West Brompton is about 1 mile south of Kensington, in Greater London. Across the SW6 area, we can carry out new build mastic at your property. West Brompton is one of 764 towns and villages in Greater London we cover for new build mastic.
Our applicators cover all of SW6, SW10 and SW5 for new build mastic and the streets around it. Whether your property is on Sun Road, Star Road and Farm Lane or a nearby road, our applicators can take on the job. West Brompton sits on or near the A3218 and A3220, which makes travel easy. Close by, we work in Earl's Court (1 mile north), Walham Green (1 mile south), World's End (1 mile south-east), Little Chelsea (1 mile east) and South Kensington (1 mile north-east). Larger places within reach include London (4 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (4 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).
Near you in West Brompton
In West Brompton, that means homes and buildings near The London Oratory School, The Fulham Boys School and Gwendwr Garden and the streets around them. Other local landmarks include Natural History Museum Library and Archives (1.1 miles north-east) and Coleherne public house (under half a mile north-east). West Brompton has its own railway station: West Brompton station. Well-known places in the area include Kensington Arcade (1 mile north) and Chelsea Stadium Tour And Museum (less than half a mile south-east). Not far away are The Long Water and WWT London Wetland Centre.
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll give you a quote.
For anyone letting property in or around West Brompton, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
How it works
We bring everything the job needs with us, so there’s nothing for you to buy. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the number of plots. In a London area like West Brompton, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- The old bead comes out in full, with no layer left behind.
- Surfaces are cleaned of building dust and primed where needed.
- A sealant chosen for each area goes in and is tooled smooth.
- Finally, each room is checked and you are given the cure time.
Getting ready for the visit
- Keep children and pets away from the work area
- Let us know about stairs, lifts or work at height
- Tell us if parking is tricky
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you’re ready, call 0345 464 0079 or email us.
Related advice
Looking after it afterwards
After the cure time, these simple habits help:
- Act quickly if a seal starts to leak
- Follow the cure time we give you
- Resist patching a failed seal with a tube from the DIY shop
- Open a window or run the fan after bathing
Avoid standing on the rim of the bath or the edge of the tray. Report any movement in a bath or tray.
Do not let the snagging period run out with sealant problems unreported. Once it ends, the repair may be down to you.
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 getting the depth right matters as much as the look.
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.
What happens if it’s left?
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it won’t bond to the old layer. Taking it all out and starting again is the only way to get a lasting seal. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts.
Why West Brompton clients choose us
- More than 20 years in sealant work
- White, clear, grey or another colour, product permitting
- Domestic, commercial and hotel work
- Anti-fungal silicone where joints get wet
Surface by surface
Skirting and floors
Gaps under skirting are one of the most common new-build snags. We seal it with a flexible sealant that copes with the movement.
Show homes
In a show home, the sealant is on display. Every bead is neat and coloured to suit the room.
When to call us in West Brompton
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, and sealant that can’t keep up splits.
The problems people normally mention when they call are:
- Plot mastic for developers ahead of handover
- Gaps between new skirting and floors
- New-build shower sealant that has already split
- Smeared, uneven beads picked up at snagging
If you’ve bought a new home near West Brompton station, the sealant around baths, showers and frames is worth checking in the first year or two.
Questions to ask before you book
- Whether VAT is included
- What preparation is included
- Are they insured?
- Is the old sealant removed completely?