Greater London · England
New-build mastic & snagging in Lissenden Gardens, Greater London
New build mastic in Lissenden Gardens from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Frame joints opening as the plaster dries
- Gaps opening as the house dries out and settles
- Second-fix sealing on new plots
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
About our new build mastic in Lissenden Gardens
For builders and developers, we work through plots to the schedule you give us. We seal bathrooms, kitchens, windows, doors and skirting so plots are ready to hand over using the right product for each joint. Typical jobs include shower seals failing in the first year or two and untidy sealant flagged on a snagging list, across show homes, windows & doors and kitchens.
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 shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
Whatever the size of the job, you get the same one-year guarantee in Lissenden Gardens and across Greater London.
- Where
- Lissenden Gardens (NW5, NW3, N19)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Lissenden Gardens
More services for Lissenden Gardens
Aftercare tips
Good habits help new joints last longer. Our tips:
- Check bath and shower seals every few months as the house settles
- Get a leaking seal dealt with right away
- Wait for the cure time before using a resealed shower
- Open a window or run the fan after bathing
Follow the cure time we give you before the area gets wet. Most silicones need around a day before water reaches them.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Catching it early keeps the fix to the sealant.
Surface by surface
Skirting and floors
As timber and screed dry, skirting and floors shift. Caulk cracks; a flexible sealant moves with it in a colour to suit.
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.
Signs you need new build mastic in Lissenden Gardens
Sealant applied onto damp surfaces does not bond well. On a busy site, joints are not always given time to dry.
Common reasons people contact us include:
- Leaking shower tray seals in a new home
- Messy sealant that spoils new finishes
- Joints pulling apart as timber shrinks
- Internal frame sealant that has split
Lissenden Gardens 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
- Whether all the old sealant comes out first
- What the cure time is
- What product goes in the joint
- What guarantee comes with the work
New build mastic in Lissenden Gardens: local notes
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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you’ve bought a new home near Gospel Oak station, the sealant around baths, showers and frames is worth checking in the first year or two.
Lissenden Gardens is about 1 mile east of Hampstead, in Greater London. We provide new build mastic to householders, landlords and businesses in Lissenden Gardens and nearby. Lissenden Gardens is one of 764 towns and villages in Greater London we cover for new build mastic.
Our applicators cover all of NW5, NW3 and N19 for new build mastic. That includes homes and businesses on Rona Road, Dale Road and Fleet Road and the roads around them. If you’re just outside Lissenden Gardens, we cover Gospel Oak (1 mile south), Dartmouth Park (1 mile north-east), Tufnell Park (1 mile east), Kentish Town (1 mile south) and Chalk Farm (1 mile south). Further out, we also cover London (5 miles south-east), City of Westminster (3 miles south), Marylebone (3 miles south), Kensington (5 miles south-west), St Pancras (3 miles south-east) and Shoreditch (4 miles south-east).
Landmarks near Lissenden Gardens
Locally, jobs take us to homes and businesses close to Parliament Hill, The Royal School and Gospel Oak Primary School and the streets around them. Other local landmarks include The Bull and Last pub (less than half a mile north-east) and Cecil Sharp House (1.3 miles south). Lissenden Gardens has its own railway station: Gospel Oak station. Well-known places in the area include Royal Northern Hospital (1.2 miles east) and Montfichet's Tower (3.7 miles south-east). Open spaces near Lissenden Gardens include Parliament Hill and The Long Water.
Lissenden Gardens: your questions answered
Can you do new build mastic in Lissenden Gardens?
Yes. We work across London and the South East, and Lissenden Gardens is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Can parking be tricky for a visit in Lissenden Gardens?
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.
Can you work from my snagging list?
Yes. Snagging lists are a common starting point for us. We’ll go through the sealant items and agree what we will do.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Who should fix failed sealant in a new build?
Your builder, if you are still in their snagging or warranty period. If that doesn’t work out, we’re happy to quote.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
What affects the cost of new build mastic
Jobs vary more than people expect. What affects the quote:
- How many areas need sealing
- How easy the joints are to reach
- Whether there’s mould to deal with
- How much there is to do
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- What’s wrong with the joints now
- If someone has resealed it before
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.
What happens on the day
Good joint work is mostly preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for most snagging lists, longer for a run of plots. In Lissenden Gardens, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- We cut out every bit of the failed or messy sealant.
- Each joint is cleaned of dust and grit, then primed if required.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Before we arrive
- On commercial sites, let us know about site rules
- Tell us about any water getting in
- Tell us if parking is tricky
Getting a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.
Related advice
Landlord and commercial work in Lissenden Gardens
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured for the work.