Greater London · England
New Build Mastic in Mayfair
Our applicators work in Mayfair on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly.
- Worktop and upstand sealant coming away
- Messy sealant that spoils new finishes
- Internal frame sealant that has split
New build mastic around Mayfair
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Mayfair is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Mayfair is about 1 mile south-east of City of Westminster, in Greater London. Homes, rented property, offices and hotels in Mayfair is covered for new build mastic. Every job comes with our 12-month guarantee. Our Greater London coverage runs to 764 places, Mayfair among them.
Our applicators cover all of W1K, W1F and W1U for new build mastic. Whether your property is on Park Lane, Bruton Lane and Market Mews or a nearby road, our applicators can take on the job. Being close to the A4201 and A4202, Mayfair is easy for our applicators to reach. Close by, we work in Burlington Estate (1 mile east), City of Westminster (1 mile north-west), Marylebone (1 mile north), St James's (1 mile east) and Chinatown (1 mile east). Larger places within reach include Shoreditch (3 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west) and Ruislip (12 miles west).
Near you in Mayfair
Around Mayfair, our work takes us to homes and buildings near Royal College of Nursing Library & Museum, Coach and Horses pub and St George's Church of England Primary School. Other local landmarks include Green Park (0.5 miles south) and The St Marylebone CofE School (0.8 miles north). Mayfair has its own railway station: Bond Street station. Nearby you’ll also find Montfichet's Tower (2 miles east) and London Eye Hospital (0.5 miles north). Green spaces nearby include Ludgate Hill and St. James's Park Lake.
New build mastic in Mayfair, done properly
We work in new homes and on new-build sites across Mayfair. Whether it’s one en suite or a run of plots, the method is the same: cut out, clean, prime where needed and reseal neatly. We work on windows & doors, kitchens and plot handovers, and common reasons people get in touch are skirting joints opening in the first winter and untidy sealant flagged on a snagging list.
London homes range from new-build flats to period conversions with new floors laid over old boards. Every joint between floor, skirting and threshold has to cope with some movement, in Mayfair as anywhere.
All our work comes with a one-year guarantee, wherever you are in Greater London.
- Where
- Mayfair (W1K, W1F, W1U)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
For developers, getting the sealant right first time saves return visits. Snagging visits for failed sealant cost time on every plot, and they’re avoidable with good preparation. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
What you get with us
- We are fully insured
- Quality sealants from Arbo and Everbuild
- Anti-fungal silicone where joints get wet
- One-year guarantee on every job
Read our cost guide and customer reviews.
Towns and villages near Mayfair
Also in Mayfair
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Get a leaking seal dealt with right away
- Keep water off fresh sealant until it has cured
- Record problems with dated photos
- Check bath and shower seals every few months as the house settles
Watch the joints as the house settles. Hairline gaps can open as timber and plaster dry, and they’re simple to reseal once movement has slowed.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak over time.
Common questions in Mayfair
I let a flat near Bond Street station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is parking an issue for new build mastic in Mayfair?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Can you match the sealant colour to my new kitchen or bathroom?
We use white, clear or a colour to suit the finishes. Tell us what you’d like when you get a quote.
How long does new build mastic take?
Typically it takes anything from a few hours to several days, depending on the number of plots. Larger jobs naturally take longer.
Is it normal for sealant to crack in a new home?
Cracking in the first couple of years is common, because the house is drying and settling. Rushed application on dusty surfaces makes it worse.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
Can new sealant go on top of the old bead?
No. Over-sealing traps mould and water and soon fails. All the old sealant comes out before any work starts.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
For anyone letting property in or around Mayfair, several properties can go on one quote. Send us the addresses and the work at each.
What happens on the day
There isn’t much for you to do on the day. Show us the job and we will take it from there. The work itself takes anything from a few hours to several days, depending on the number of plots, including the tidy-up. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- Each joint is checked for movement before work begins.
- Old sealant is cut out and the joints cleaned.
- 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
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or drop us an email.
Advice
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Surface by surface
Plot handovers
Plot mastic is carried out to the developer’s schedule. Joints are prepared properly before sealing.
Skirting and floors
Floors and skirting move as the house dries and the heating runs. Caulk cracks; a flexible sealant moves with it.
Do you need new build mastic in Mayfair?
Sealant is often one of the last jobs before handover. Joints aren’t always cleaned of dust or primed, and the sealant sits on grit instead of the surface.
These are the problems we’re asked about most:
- Beads laid onto grit and dust from the build
- Shower seals failing in the first year or two
- Gaps opening as the house dries out and settles
- Messy sealant that spoils new finishes
If you’ve bought a new home near Bond Street station, the sealant around baths, showers and frames is worth checking in the first year or two.
Questions to ask before you book
- Whether VAT is included
- How the colour is chosen
- Is the old sealant removed completely?
- Who turns up on the day