Greater London · England
New-build mastic & snagging in Lisson Grove, Greater London
New build mastic for Lisson Grove and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Worktop and upstand sealant coming away
- Internal frame sealant that has split
- Shower seals failing in the first year or two
About our new build mastic in Lisson Grove
Building dust is behind a lot of failed new-build sealant. We clean every joint thoroughly and prime where the surface and product need it, so the new bead bonds properly. We work on kitchens, bathrooms & en suites and plot handovers, and common reasons people get in touch are gaps behind new kitchen upstands and sealant applied over dusty or wet surfaces.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Place
- Lisson Grove (NW8, W1H, W2)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Lisson Grove
Can you help a landlord with a rental near London Marylebone station?
Yes. We work for letting agents and landlords as well as homeowners. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Is parking an issue for new build mastic in Lisson Grove?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that generally means someone at home.
Where are you based?
We work from Crawley. Our applicators cover Lisson Grove.
Will there be a smell?
There can be a smell while the sealant cures. Ventilation helps.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
What does new build mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
Is it normal for sealant to crack in a new home?
It’s common, and there are usually two reasons: the house moving as it dries, and sealant that never bonded properly. Cutting it out and resealing properly fixes both.
What affects the cost of new build mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How many areas need sealing
- The old material and how stubborn it is
- The type of sealant required
- The number and length of the joints
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, ring 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Helping us quote
There’s no need for technical detail. Just tell us:
- Pictures of the joints, sent by email
- The type of property
- The address or postcode of the job
- Whether it has been sealed before
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before any work starts.
What new build mastic looks like in Lisson Grove
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
If you’ve bought a new home near London Marylebone station, the sealant around baths, showers and frames is worth checking in the first year or two.
Lisson Grove is about 1 mile north-west of City of Westminster, in Greater London. Our applicators cover new build mastic for householders, landlords and businesses in Lisson Grove and nearby, as part of our work across Greater London. Lisson Grove is one of 764 places in Greater London where we work for new build mastic.
Postcode districts we cover here for new build mastic: NW8, W1H and W2. You’ll find streets such as Hall Road, Park Road and Lodge Road, and we cover them all. Lisson Grove is on the A5 and A40, so it’s easy for us to get to. Close by, we work in Paddington Green (1 mile south-west), Paddington (1 mile south), Little Venice (1 mile south-west), Connaught Village (1 mile south) and St John's Wood (1 mile north). Within a short drive, we also cover London (4 miles south-east), Shoreditch (4 miles east), Walthamstow (8 miles north-east), Hoxton (4 miles east), Whitechapel (4 miles east) and Ruislip (11 miles west).
What’s near Lisson Grove
Typical jobs here are in homes near RIBA Library, St John's Wood Art School and Regent's Park. Lisson Grove has its own railway station: London Marylebone station. Nearby you’ll also find Montfichet's Tower (3 miles east) and Maida Vale Hospital for Nervous Diseases (0.5 miles west). Open spaces near Lisson Grove include The Long Water and Greville Place nature reserve.
Signs you need new build mastic in Lisson Grove
Once people move in, baths and trays take weight and bed down. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used.
These are the problems we are asked about most:
- Internal frame sealant that has split
- Gaps behind new kitchen upstands
- Untidy sealant flagged on a snagging list
- Sealant that never bonded to the surface
As a London address, Lisson Grove can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before you book anyone
- What preparation is included
- How the colour is chosen
- What the quote includes, VAT included or not
- Whether all the old sealant comes out first
What we cannot put right
In fairness, some problems need a different trade:
- Structural cracks in walls or ceilings
- Disputes or warranty claims with your builder
- Leaking fittings rather than failed sealant
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Lisson Grove
- Kitchens
- Windows & doors
- Show homes
- Bathrooms & en suites
- Plot handovers
- Skirting & floors
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
What happens if it’s left?
If you are still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Lisson Grove, the repair is bigger than a sealant job.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- 20+ years of sealant experience
- Anti-fungal silicone where joints get wet
- 4.9 on Google from 180+ five-star reviews
- We’re fully insured
Take a look at our cost guide or our reviews.
What happens on the day
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and tidy away. It normally takes a few hours in a single home. For a job in Lisson Grove, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- The old bead comes out in full, with no layer left behind.
- Surfaces are cleaned of building dust and primed where needed.
- A sealant chosen for each area goes in and is tooled smooth.
- Finally, each room is checked and you are given the cure time.
How to prepare
- Mention if the joints have been sealed before
- Clear the area around the work
- For business premises, tell us about site rules or sign-in
Get a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or drop us an email.
Advice
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Follow the cure time we give you
- Use the extractor fan every time you shower
- Report sealant problems to your builder during the snagging period
- Get a leaking seal dealt with straight away
Ventilation matters in a new home, which is still drying out. Use the extractor fan or open a window after showers.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small and protects the rest of the house.