Greater London · England
New-build mastic & snagging in Widmore, Greater London
Plot mastic for developers and snagging failed sealant in new homes for Widmore, backed by a 12-month guarantee. Call for a quick quote.
- Untidy sealant flagged on a snagging list
- Cracked sealant around new window and door frames
- New-build shower sealant that has already split
How we handle new build mastic in Widmore
New homes move as they dry out. Timber dries and shrinks, and baths and trays settle, and sealant applied in a hurry at handover can split. If you have internal frame sealant that has split and gaps between new skirting and floors, we can put it right, whatever the surface.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, and new homes need their plot mastic finished properly before handover, in Widmore and beyond.
All our work comes with our one-year guarantee.
- Location
- Widmore (BR1, BR2, BR7)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Cracking that points to a structural problem
- Broken tiles or a split tray
- Disputes or warranty claims with your builder
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before you book.
What we seal
- Bathrooms & en suites
- Kitchens
- Skirting & floors
- Show homes
- Windows & doors
- Plot handovers
The process
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes a few hours in a single home for a typical job. In Widmore, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We go through the snagging list or plot schedule and agree the joints to do.
- The old bead comes out in full, with no layer left behind.
- We clean off dust from the build and prime the surfaces where the product needs it.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
- Try not to wet indoor joints just before the visit
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or send us an email with the details.
Read more
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we are fully insured for the work.
Also in Widmore
How the job changes by surface
Plot handovers
Developers can send the plot schedule and specification and we’ll quote. We seal bathrooms, kitchens, frames and floors to the agreed spec.
Show homes
We can refresh show-home sealant that has discoloured or been knocked. The old bead comes out and a clean new one goes in.
Do you need new build mastic in Widmore?
If plaster or screed was still damp when it was sealed, the bond suffers. Site programmes do not always leave time for joints to dry.
Common reasons people contact us are:
- Cracked sealant around new window and door frames
- Messy sealant that spoils new finishes
- Cracks appearing as a new home settles
- Gaps behind new kitchen upstands
For new homes near Bickley station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- Who turns up on the day
- Is the old sealant removed completely?
- How long the guarantee is
- Whether they’re fully insured
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Raise failed sealant with the developer while you’re covered
- 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
Photograph failed sealant before it’s redone and keep the builder’s replies. It helps if anything else comes up during the warranty period.
Early snagging is easier snagging. Left alone, a small crack can become a leak.
Widmore: your questions answered
Can parking be tricky for a visit in Widmore?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
I let a flat near Bickley station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you use white or clear sealant?
The colour is chosen to suit the tiles, worktop or frame. Let us know your preference when you ask for a quote.
Can you do plot mastic on a new development?
Yes. We work through plots to your schedule. Tell us the plots and the joints involved for a clear quote.
How do I get a quote for new build mastic in Widmore?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.
Is the work guaranteed?
Yes. All our work carries a 12-month guarantee.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you when we finish.
When is the best time to reseal in a new build?
That depends on the joint. A leaking shower or bath seal should be redone straight away, but cosmetic gaps can wait for movement to slow.
What new build mastic looks like in Widmore
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
As a London address, Widmore can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Widmore is about 1 mile east of Bromley, in Greater London. Jobs in Widmore get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Across Greater London, we cover 764 places, and Widmore is one of them. Our London page covers work nearby (9 miles or so).
We cover every part of BR1, BR2 and BR7 for new build mastic. If you need new build mastic at a property on Golf Road, The Avenue and Canon Road or anywhere close by, we can help. We also cover Bickley (1 mile north), Elmstead (1 mile north), Chislehurst (1 mile north-east), Bromley (1 mile west) and Sundridge (1 mile north-west). Further out, we also cover London (9 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (13 miles north-west), St Pancras (11 miles north-west) and Shoreditch (10 miles north-west).
What’s near Widmore
We work in homes and buildings around Bird In Hand Public House, St George's and Jubilee Country Park. Widmore has its own railway station: Bickley station. A little further out are Bridgeways Day Hospital (1 mile south) and The Mall (1.3 miles west). The countryside around Widmore includes Summer Hill and The Tarn.