Greater London · England
New-build mastic & snagging in Westcombe Park, Greater London
Our applicators work in Westcombe Park on plot mastic for developers and snagging failed sealant in new homes. Old material cut out, joints cleaned and sealed neatly.
- Worktop and upstand sealant coming away
- Cracked caulk along new skirting
- Cracked sealant around new window and door frames
Quotes for new build mastic in Westcombe Park
There’s no set price list, because jobs vary so much. The quote depends on:
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
- The amount of work
- Which sealant suits the joint
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or email us and we’ll give you an honest view and a quote.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- How we’d reach the joints
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
About our new build mastic in Westcombe Park
We carry out plot mastic and second-fix sealing for builders, and snagging reseals for new-home owners. In both, preparation makes the difference since hurried prep is behind a lot of new-build failures. We work on bathrooms & en suites, skirting & floors and kitchens, and the jobs we see most are leaking shower tray seals in a new home and joints pulling apart as timber shrinks.
Much of London’s new housing is flats in larger developments. In a new development, snags are often reported through the developer or the managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
Your job is guaranteed for a year, as with all our work.
- Location
- Westcombe Park (SE10, SE7, SE3)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Westcombe Park
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Your questions about new build mastic in Westcombe Park
Can parking be tricky for a visit in Westcombe Park?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can you do new build mastic in Westcombe Park?
Yes, Westcombe Park is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Do you take out the old sealant first?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Why does sealant fail so quickly in new builds?
It’s common, and there are generally two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
How long does the job take?
That depends on the amount of work, but as a guide it takes anything from a few hours to several days, depending on the number of plots. We will give you a better idea when we quote.
Can new sealant go on top of the old bead?
No. New silicone will not bond to old silicone, so sealing over the top fails quickly. We cut the old bead out completely.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Different surfaces, different methods
Show homes
We seal show-home bathrooms, kitchens and frames to a tidy standard. Tell us when the home is open so we can plan around it.
Plot handovers
Good preparation at handover saves snagging later. We clean out building dust before sealing and primer used where needed.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Act quickly if a seal starts to leak
- Open a window or run the fan after bathing
- Avoid scourers and strong chemicals on sealant
- Keep photos and emails about snagging items
Avoid standing on the rim of the bath or the edge of the tray while the sealant cures. If a bath or tray moves when you stand in it, get it looked at.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
Signs you need new build mastic in Westcombe Park
Not every new-build joint gets the right sealant: caulk where water collects, or a rigid product on a moving joint. Both fail early.
The problems people usually mention when they call include:
- Leaking shower tray seals in a new home
- Cracks appearing as a new home settles
- Smeared, uneven beads picked up at snagging
- Beads laid onto grit and dust from the build
As a London address, Westcombe Park can be tricky for parking: let us know about parking bays, permits or a driveway.
Before booking anyone
- Who turns up on the day
- What the cure time is
- Whether they seal over old material or remove it
- What happens if the job turns out different
The process
The work is kept neat and contained to the area we are working on, so you can carry on as normal. Expect the work to take a few hours in a single home, and we tell you how long to leave it before we go. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Westcombe Park. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- 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.
Preparing for the visit
- Tell us about any water getting in
- Let us know about parking restrictions
- Clear the area around the work
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To arrange one, phone 0345 464 0079 or send us an email.
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Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
New build mastic around Westcombe Park
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
For new homes near Westcombe Park station, it’s worth checking the sealant early, while snags are still fresh.
Westcombe Park is about 2 miles east of New Cross, in Greater London. Every kind of property in Westcombe Park can book us for new build mastic, old or new, large or small. Every job comes with our 12-month guarantee. 764 places in Greater London are on our list, from the larger towns to small villages.
Work in SE10, SE7 and SE3 is quoted and booked the same way as anywhere else. Streets in the area include Webb Road, Horn Lane and Hardy Road, all of which we cover. Close by, we work in Vanbrugh Park Estate (1 mile south-west), Maze Hill (1 mile west), Greenwich (1 mile west), New Charlton (1 mile north-east) and Charlton (1 mile east). Further out, we also cover London (5 miles west), City of Westminster (8 miles west), Marylebone (7 miles west), Kensington (10 miles west), St Pancras (7 miles north-west) and Shoreditch (5 miles north-west).
Around Westcombe Park
Locally, jobs take us to homes and businesses close to Blackheath High School, Wildwood Montessori School and East Greenwich Pleasaunce and the streets around them. Westcombe Park has its own railway station: Westcombe Park station. Other landmarks nearby include Greenwich Castle (1 mile south-west) and Charlton Athletic Museum (0.8 miles east). Open spaces near Westcombe Park include Tower Hill and Gilbert's Pit.