Greater London · England
New-build mastic & snagging in Nash, Greater London
New build mastic for Nash and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Internal frame sealant that has split
- Shower seals failing in the first year or two
- Worktop and upstand sealant coming away
New build mastic for homes and businesses in Nash
A new build should have a neat, sound bead at every joint. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water reaches anything behind it. We work on windows & doors, bathrooms & en suites and kitchens, and common reasons people get in touch are untidy sealant flagged on a snagging list and plot mastic for developers ahead of handover.
New flats are going up across London, many of them 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.
All of our work is guaranteed for twelve months, in Nash and everywhere else we cover.
- Location
- Nash (BR2)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
So the new joints stay in good condition:
- Avoid scourers and strong chemicals on sealant
- Look at the sealant regularly in the first couple of years
- Wait for the cure time before using a resealed shower
- Keep photos and emails about snagging items
Follow the cure time we give you before the area gets wet. Most silicones need around a day.
If a shower tray or bath seal splits in the first year, look for movement. Getting it resealed properly, and any movement checked, stops it recurring.
When something else is needed
We will always be straight with you, so here’s what new sealant won’t do:
- A tray or bath that isn’t properly supported, until it’s fixed
- Damaged fittings that need replacing
- Your warranty claim itself, which is between you and the builder
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Where we work in Nash
- Show homes
- Windows & doors
- Plot handovers
- Skirting & floors
- Kitchens
- Bathrooms & en suites
Questions from Nash
Is Nash in your area for new build mastic?
Yes, Nash is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Is parking a problem for a job in Nash?
Parking in Nash, 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.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Do you guarantee your work?
Yes. Every job comes with a 12-month guarantee.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned.
Do you need new build mastic in Nash?
Later trades and the final clean can damage fresh sealant. If it’s disturbed before curing, the joint can be left weak.
Any of these means the joints need attention:
- Cracks appearing as a new home settles
- Sealant work across a run of new homes
- Beads laid onto grit and dust from the build
- Worktop and upstand sealant coming away
If you’ve bought a new home near Hayes (Kent) station, the sealant around baths, showers and frames is worth checking in the first year or two.
Comparing quotes
- What guarantee comes with the work
- Whether VAT is included
- Who does the work, and how experienced they are
- What happens if they find a problem under the old sealant
Why deal with it now?
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it will not bond to the old layer. Taking it all out and starting again is the only way to get a lasting seal. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Nash.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Why Nash customers choose us
- Approved under the ARBOMaster scheme
- Rated 4.9 stars on Google
- We’re fully insured
- We never seal over old sealant
Take a look at how sealant jobs are priced and what customers say.
What affects the quote in Nash
Every job gets its own quote. These are the things that affect it:
- Whether the work is at height
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- The type of sealant required
What you pay reflects the work, not guesswork. That is why we ask about the job first and give you a clear price before any work starts.
What we need to know
When you contact us, it’s useful to know:
- If someone has resealed it before
- Whether it’s a home or a business
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
If you are in Nash and need new build mastic, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
What new build mastic looks like in Nash
Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Nash is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Nash is about 3 miles south of Bromley, in Greater London. From the centre of Nash to the outskirts, we cover new build mastic for every kind of property. Our Greater London coverage runs to 764 places, Nash among them. London is on our list too, about 11 miles from Nash.
Postcode districts we cover here for new build mastic: BR2. Local streets include Nash Lane and North Pole Lane, and we cover them all. Other places close to Nash include Keston (1 mile east), Leaves Green (1 mile south-east), Hayes (1 mile north), New Addington (2 miles south-west) and Farthing Street (2 miles south-east). Further out, we also cover London (11 miles north-west), City of Westminster (13 miles north-west), Marylebone (13 miles north-west), Kensington (14 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north).
Near you in Nash
In Nash, that means homes and buildings near The Greyhound pub, All Saints Catholic School and Coney Hall Recreation Ground. The closest station to Nash is Hayes (Kent) station, about 1.4 miles north of the centre. Nearby you’ll also find The Mall (3.2 miles north) and Bethlem Museum of the Mind (1.8 miles north). Green spaces nearby include Hutchinson's Bank and Summer Hill.
Different surfaces, different methods
Skirting and floors
Wet-area floor joints need a flexible seal. We seal them with a sealant suited to wet areas.
Show homes
We seal show-home bathrooms, kitchens and frames. We will plan around viewing times.
Other services in Nash
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours for most snagging lists, longer for a run of plots. 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.
- We look at why each joint failed, including any movement.
- Old sealant is cut out and the joints cleaned.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
- Let us know about parking restrictions
Get a quote
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or email us.