Greater London · England
New-build mastic & snagging in West End, Greater London
Plot mastic for developers and snagging failed sealant in new homes for homes and businesses in West End and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Untidy sealant flagged on a snagging list
- Beads laid onto grit and dust from the build
- Gaps between new skirting and floors
About our new build mastic in West End
In a new home, every joint should have a clean, even bead. Smeared, patchy or cracked sealant is worth sorting early, before water gets into the floor or walls. We work on windows & doors, show homes and bathrooms & en suites, and common reasons people get in touch are joints pulling apart as timber shrinks and leaking shower tray seals in a new home.
Across London, commercial floors have movement joints that break down under heavy foot traffic, while new homes need a neat, sound finish around frames, baths and kitchens before handover, in West End and beyond.
Big or small, you get the same one-year guarantee.
- Location
- West End (W1F, W1D, W1T)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in West End
A hairline gap at a skirting can wait, but a leaking seal can’t. If you are unsure which you have, call 0345 464 0079 or send us an email with photos and we will give you a straight answer. In a flat in West End, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Why choose Mr Mastic in West End
- Quality sealants from Arbo and Everbuild
- Over 20 years’ experience
- Domestic, commercial and hotel work
- 12-month guarantee on every job
Read how sealant jobs are priced or our reviews.
Signs you need new build mastic in West End
The wrong product is sometimes used in the wrong place: caulk where water collects, or a rigid product on a moving joint. Both fail early.
It’s worth asking for a quote if you see:
- Cracked sealant around new window and door frames
- Cracks appearing as a new home settles
- Plot mastic for developers ahead of handover
- Untidy sealant flagged on a snagging list
West End is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- What the cure time is
- What happens if the job turns out different
- How long the guarantee is
- Are they insured?
What the job involves on each surface
Bathrooms and en suites
Trays and baths in new builds settle as they’re used. We reseal once the old bead is fully out with baths filled first.
Windows and doors
Draughts around new frames are often a sealant gap. We look at the joints and reseal where needed.
What affects the quote in West End
Your quote is based on your job. We look at:
- Whether there’s mould to deal with
- How many rooms, windows or areas are involved
- The number and length of the joints
- Working hours on commercial sites
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
What to tell us for a quote
When you contact us, it’s useful to know:
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
- The address or postcode of the job
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details, and pictures are welcome.
Questions from West End
Can you do new build mastic in West End?
Yes. We work across London and the South East, and West End is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Is parking a problem for a job in West End?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
I’m a tenant. Can you help?
Yes. Check with your landlord; we can send the quote to them too.
Is the work guaranteed?
Yes, for a year. If anything is not right with the work within the year, let us know and we will sort it.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
Can you do plot mastic on a new development?
Yes. We seal plots to the developer’s programme ready for handover. Tell us the plots and the joints involved for a clear quote.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
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.
New build mastic around West End
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For new homes near Tottenham Court Road station, it’s worth checking the sealant early, while snags are still fresh.
West End is about 1 mile east of City of Westminster, in Greater London. If you need new build mastic in West End, please phone 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base. 764 places in Greater London are on our list, from the larger towns to small villages.
We work across the W1F, W1D and W1T postcode area for new build mastic. If you need new build mastic at a property on Duck Lane, Drury Lane and Bridle Lane or anywhere close by, we can help. Main roads around West End include the A301 and A400, which makes travel easy. Other places close to West End include Seven Dials (1 mile east), St Giles (1 mile north-east), Soho (1 mile west), Chinatown (1 mile south-west) and Covent Garden (1 mile east). Within a short drive, we also cover Kensington (3 miles west), Walthamstow (7 miles north-east), Whitechapel (3 miles east), Hampstead (4 miles north-west), Ruislip (13 miles west) and Stockwell (3 miles south).
Landmarks near West End
Locally, jobs take us to homes and businesses close to LSE Shaw Library, Brewdog pub and St Anne's Churchyard, among other places. Also close by are Harris Westminster Sixth Form (1 mile south) and LITE Regal International School (0.7 miles west). West End has its own railway station: Tottenham Court Road station. A little further out are St Paul's Hospital (within half a mile north-east) and Leverian collection (within half a mile south). Green spaces nearby include St. James's Park Lake and Barnsbury Wood.
Towns and villages near West End
Other services in West End
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. Most jobs take a few hours in a single home. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in West End. 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 down to clean surfaces.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
- On commercial sites, let us know about site rules
Get a quote
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Advice
Aftercare tips
Good habits help new joints last longer. Our tips:
- Keep water off fresh sealant until it has cured
- Resist patching a failed seal with a tube from the DIY shop
- Ventilate bathrooms well, especially in the first year
- Record problems with dated photos
Follow the cure time we give you before the area gets wet. Most silicones need around a day before water reaches them.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Small faults turn into leaks if left in a busy bathroom.