Greater London · England
Clapham Junction New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for Clapham Junction, backed by a 12-month guarantee. Call for a quick quote.
- Joints pulling apart as timber shrinks
- Gaps behind new kitchen upstands
- Plot mastic for developers ahead of handover
What new build mastic looks like in Clapham Junction
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 snags may need reporting through the developer or the managing agent.
If you’ve bought a new home near Clapham Junction station, the sealant around baths, showers and frames is worth checking in the first year or two.
Clapham Junction is about 3 miles south-east of Kensington, in Greater London. Clapham Junction gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 764 places in Greater London are on our list, large and small.
We work across SW11, SW18 and SW4 for new build mastic. You’ll find streets such as York Road, Este Road and Home Road, and we cover them all. Main roads around Clapham Junction include the A3207, so getting to you is simple. We also cover the places around Clapham Junction: Battersea (1 mile south-east), Sands End (1 mile north-west), Chelsea Harbour (1 mile north-west), Wandsworth (1 mile south-west) and Clapham (1 mile east). We also work in nearby towns such as London (4 miles north-east), City of Westminster (4 miles north), Marylebone (4 miles north), Kensington (3 miles north-west), St Pancras (5 miles north-east) and Shoreditch (6 miles north-east).
What’s near Clapham Junction
In Clapham Junction, that means homes and buildings near Imperial Park, The Falcon pub and Thames Christian College and the streets around them. Clapham Junction has its own railway station: Clapham Junction station. Other landmarks nearby include Baynard's Castle (4.4 miles north-east) and Battersea General Hospital (0.8 miles north). Open spaces near Clapham Junction include Battersea Park Lake and Wandle Meadow Nature Park.
New build mastic for homes and businesses in Clapham Junction
Snagging sealant properly means taking the failed bead out completely. Fresh silicone cannot bond to the old layer, so it all comes out before we clean, dry and reseal. If you are dealing with untidy sealant flagged on a snagging list and gaps between new skirting and floors, we can help, whatever the surface.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Every joint between floor, skirting and threshold has to cope with some movement.
Each job carries a 12-month guarantee.
- Where
- Clapham Junction (SW11, SW18, SW4)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we cannot put right
We will not take on work that will not last, so here’s what sealant can’t put right:
- Damaged fittings that need replacing
- Settlement cracks that need a surveyor
- A tray or bath that isn’t properly supported, until it’s fixed
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Where we work in Clapham Junction
- Show homes
- Skirting & floors
- Kitchens
- Windows & doors
- Plot handovers
- Bathrooms & en suites
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Look at the sealant regularly in the first couple of years
- Follow the cure time we give you
- Use the extractor fan every time you shower
- Act quickly if a seal starts to leak
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents.
Lifting sealant traps moisture and mould behind it. Resealing before mould gets in keeps the job straightforward.
What the job involves on each surface
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We take it out and reseal neatly, colour-matched where it shows.
Skirting and floors
Wet-area floor joints need a flexible seal. They get a flexible, water-resistant sealant.
FAQs for Clapham Junction
Is parking a problem for a job in Clapham Junction?
Parking in Clapham Junction, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is Clapham Junction in your area for new build mastic?
Yes. Our work covers London and the South East, and Clapham Junction is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing.
How long does new build mastic take?
It depends on the size of the job, but as a guide it takes a few hours for most snagging lists, longer for a run of plots. We will tell you when we quote.
When is the sealant fully cured?
It depends on the product. We tell you how long to leave it before we go.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in.
Why has my new-build shower seal failed already?
It’s common, and there are usually two reasons: the house moving as it dries, and sealant that never bonded properly. A proper reseal deals with both.
Can I send you my snagging list?
Yes. Send it with pictures and we’ll quote for the sealant items. Items that need a plumber, tiler or the builder are flagged.
Quotes for new build mastic in Clapham Junction
Your quote is based on your job. We take into account:
- Which sealant suits the joint
- Access and height
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- If someone has resealed it before
- The type of property
- Where the job is, and your postcode
- The rough size of the job
Want a quote for new build mastic? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and give you a clear quote before we start.
What we’re called out for in Clapham Junction
Sealant applied onto damp surfaces doesn’t bond well. Site programmes don’t always leave time for joints to dry.
Common reasons people contact us include:
- Shower seals failing in the first year or two
- Gaps opening as the house dries out and settles
- Sealant applied over dusty or wet surfaces
- Kitchen sealant that has pulled off the wall
As a London address, Clapham Junction can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- What insurance they hold
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
- What the cure time 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. A lasting seal starts with removing the old one completely. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Clapham Junction, the repair is bigger than a sealant job.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
What you get with us
- Neat joints and a tidy finish
- Trusted Arbo and Everbuild sealants
- An ARBOMaster approved applicator
- Sealant colour chosen to suit
See what affects the cost or our reviews.
What we do, step by step
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. The job normally takes a few hours in a single home, and we explain the cure time before we leave. In a London area like Clapham Junction, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We go through the snagging list or plot schedule and agree the joints to do.
- We cut out every bit of the failed or messy sealant.
- Surfaces are cleaned of building dust and primed where needed.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Each area is checked and left with its cure time.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we are working on
How to get a quote
If you’re in Clapham Junction and need new build mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.