Greater London · England
Chelsea New Build Mastic
New build mastic across Chelsea and nearby, with old sealant always removed completely.
- Leaking shower tray seals in a new home
- Gaps behind new kitchen upstands
- Sealant that never bonded to the surface
About our new build mastic in Chelsea
Snagging sealant properly means taking the failed bead out completely. New silicone will not bond to old silicone, so it all comes out before we clean, dry and reseal. We work on kitchens, plot handovers and bathrooms & en suites, and common reasons people get in touch are sealant that never bonded to the surface and sealant work across a run of new homes.
Across London, commercial floors have movement joints that break down under heavy foot traffic, and new homes need their plot mastic finished properly before handover.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Where
- Chelsea (SW3, SW10, SW1X, SW1W)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about new build mastic in Chelsea
Is parking an issue for new build mastic in Chelsea?
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 cover Chelsea for new build mastic?
Yes. Our work covers London and the South East, and Chelsea is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you use white or clear sealant?
We use white, clear or a colour to suit the finishes. Let us know your preference when you ask for a quote.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
How the job changes by surface
Bathrooms and en suites
En suite showers are a common source of leaks into the room below. A proper reseal keeps water in the tray.
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We remove it and reseal with a kitchen-suitable sealant.
Why it’s worth doing now in Chelsea
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it cannot bond to what’s underneath. 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.
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Why Chelsea clients choose us
- White, clear, grey or another colour, product permitting
- Colour picked to suit the job
- Anti-fungal sanitary silicone in wet areas
- Tidy, careful work
Read what affects the cost and customer reviews.
Landlord and commercial work in Chelsea
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Landlords and letting agents in Chelsea can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
Quotes for new build mastic in Chelsea
You will get a clear quote before any work starts. It takes into account:
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- The old material and how stubborn it is
- Any working-time requirements on site
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
What to tell us for a quote
Before you ask for a quote, have a think about:
- If someone has resealed it before
- Where the property is
- The problem you’ve noticed
- How we’d reach the joints
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
New homes and floors in Chelsea
Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent. 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.
As a London address, Chelsea can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For new homes near London Victoria station, it’s worth checking the sealant early, while snags are still fresh.
Chelsea is about 2 miles south-east of Kensington, in Greater London. Homes, rented property, offices and hotels in Chelsea can book us for new build mastic. The work is guaranteed for a year. Across Greater London, we cover 764 places, and Chelsea is one of them.
All of SW3, SW10, SW1X and SW1W is within our area for new build mastic. If you need new build mastic at a property on Markham Square, Wellington Square and Tedworth Square or a nearby road, our applicators can take on the job. Main roads around Chelsea include the B302 and B304, which makes travel easy. We also cover Brompton (1 mile north), South Kensington (1 mile west), Little Chelsea (1 mile south-west), Belgravia (1 mile north-east) and World's End (1 mile south-west). Within a short drive, we also cover London (3 miles east), St Pancras (3 miles north-east), Shoreditch (5 miles north-east), Walthamstow (9 miles north-east), Hoxton (5 miles north-east) and Whitechapel (5 miles north-east).
Local landmarks in Chelsea
Typical jobs here are in homes near Burton’s Court, St Thomas More RC Language College and Markham Arms Public House and the streets around them. You will also find Natural History Museum Library and Archives (0.7 miles north-west) and Hellenic College of London (0.5 miles north). Chelsea’s nearest station is London Victoria station, about 1 mile north-east. Well-known places in the area include Baynard's Castle (3.2 miles north-east) and Harrods (0.7 miles north). For a walk, there’s Campden Hill and Battersea Park Lake.
What else we do in Chelsea
Aftercare tips
After the cure time, these simple habits help:
- Put sealant faults on your snagging list early
- Act quickly if a seal starts to leak
- Keep water off fresh sealant until it has cured
- Look at the sealant regularly in the first couple of years
Keep photos of the joints and any snagging correspondence with your builder. It helps if anything else comes up during the warranty period.
Do not let the snagging period run out with sealant problems unreported. After that, putting it right may fall to you.
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How the visit works
We keep the work tidy and contained to the area we are working on, so you can get on with your day. Expect the work to take a few hours in a single home, and we explain the cure time before we leave. In a London area like Chelsea, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
How to prepare
- Mention any tricky access
- Clear the area around the work
- Mention any sign-in or site rules at work premises
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.