Greater London · England
New-build mastic & snagging in Seven Dials, Greater London
We cover Seven Dials for plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- New-build shower sealant that has already split
- Gaps opening as the house dries out and settles
- Sealant applied over dusty or wet surfaces
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
How we handle new build mastic in Seven Dials
A new build should have a neat, sound bead at every joint. Smeared, patchy or cracked sealant is worth sorting early, before water gets into the floor or walls. If you are dealing with worktop and upstand sealant coming away and cracks appearing as a new home settles, we can help.
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, in Seven Dials and beyond.
Our work is backed for twelve months, in Seven Dials and everywhere else we cover.
- Place
- Seven Dials (W1F, W1D, W1T)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Seven Dials
What else we do in Seven Dials
Why deal with it now?
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time, and they’re avoidable with good preparation. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Seven Dials, the repair is bigger than the sealant job would have been.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will go through it with you.
Why Seven Dials customers choose us
- Experience in homes, commercial sites and hotels
- Approved under the ARBOMaster scheme
- More than 20 years in sealant work
- You choose the colour before work begins
Read our cost guide and customer reviews.
How the job changes by surface
Windows and doors
Draughts around new frames are often a sealant gap. We check and reseal the frame edges.
Plot handovers
Taking time over preparation reduces return visits. Dust from the build is removed first and prime where the product needs it.
Seven Dials questions
I let a flat near Tottenham Court Road station. Can you help?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Is parking a problem for a job in Seven Dials?
Parking in Seven Dials, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
How do I get a quote for new build mastic in Seven Dials?
Size, access and the old material all affect the cost. Call for a quick quote.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Is there a guarantee?
Yes. Each job is guaranteed for twelve months, large or small.
Can you reseal over the builder’s sealant?
No. Over-sealing traps mould and water and soon fails. All the old sealant comes out before we start.
Which products do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We will tell you what we’re using and why.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
What happens on the day
On the day, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before we start. Most jobs take a few hours for most snagging lists, longer for a run of plots. In Seven Dials, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each joint is checked for movement before we start.
- We remove the failed sealant and clean the joints.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Before we arrive
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Advice
What affects the quote in Seven Dials
There’s no set price list, because jobs vary so much. What we look at:
- Access and height
- Whether old sealant or filler has to be cut out
- The product the joint needs
- The amount of work
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- Photos by email, if that is easy
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or drop us an email.
Aftercare tips
To keep the joints looking good and working properly:
- Keep photos and emails about snagging items
- Report sealant problems to your builder during the snagging period
- Do not seal over failed sealant yourself
- Ventilate bathrooms well, especially in the first year
Follow the cure time we give you before the area gets wet. Silicone is usually left for about a day.
Lifting sealant traps moisture and mould behind it. Dealing with it before it goes black keeps the job straightforward.
New homes and floors in Seven Dials
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For new homes near Tottenham Court Road station, it’s worth checking the sealant early, while snags are still fresh. Seven Dials is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Seven Dials is about 1 mile east of City of Westminster, in Greater London. We carry out new build mastic for homes and businesses in Seven Dials and the surrounding area, as part of our work across Greater London. Seven Dials is one of 764 towns and villages in Greater London where we work.
Here we cover the W1F, W1D and W1T postcode area for new build mastic. Local streets include Duck Lane, Drury Lane and Bridle Lane, and we cover them all. With the A301 and A400 close by, Seven Dials is simple for us to get to for new build mastic. If you are just outside Seven Dials, we cover St Giles (1 mile north), West End (1 mile west), Soho (1 mile west), Covent Garden (1 mile east) and Chinatown (1 mile south-west). We also work in nearby towns such as Kensington (3 miles west), Walthamstow (7 miles north-east), Hampstead (4 miles north-west), Ruislip (13 miles west), Stockwell (3 miles south) and Orpington (13 miles south-east).
Local landmarks in Seven Dials
Around Seven Dials, our work takes us to homes and buildings near London Nautical School, St Anne's Churchyard and LSE Shaw Library and the streets around them. You will also find Two Brewers pub (within half a mile south-west) and Mercers' School (0.8 miles east). Seven Dials has its own railway station: Tottenham Court Road station. A little further out are Kingly Court (0.5 miles west) and St Paul's Hospital (less than half a mile north-east). Not far away are Barnsbury Wood and Ludgate Hill.