Greater London · England
New Build Mastic in Westminster
Professional new build mastic in and around Westminster, with every bit of old sealant taken out first and a one-year guarantee.
- Untidy sealant flagged on a snagging list
- New-build shower sealant that has already split
- Joints pulling apart as timber shrinks
Westminster questions
I let a flat near London Victoria station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can be quoted together. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover Westminster for new build mastic?
Yes, Westminster is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.
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. A proper reseal deals with both.
Can you match the sealant colour to my new kitchen or bathroom?
The colour is chosen to suit the tiles, worktop or frame. Tell us what you’d like when you get a quote.
How long will you be here?
Most jobs take a few hours in a single home, including preparation and clearing up. We will confirm how long when we quote.
Can you do plot mastic on a new development?
Yes. We seal plots to the developer’s programme ready for handover. Get in touch with the number of plots and the scope for a clear quote.
How do I get a quote for new build mastic in Westminster?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
New build mastic for homes and businesses in Westminster
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, so sealant that was laid quickly before handover often cracks. If you have gaps behind new kitchen upstands and smeared, uneven beads picked up at snagging, we can help, whatever the surface.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Every joint between floor, skirting and threshold has to cope with some movement.
All our work comes with a one-year guarantee, wherever you are in Greater London.
- Place
- Westminster (SW1P, W1J, SW1V)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
Good habits help new joints last longer. Our tips:
- Resist patching a failed seal with a tube from the DIY shop
- Get a leaking seal dealt with right away
- Ventilate bathrooms well, especially in the first year
- Keep water off fresh sealant until it has cured
Avoid standing on the rim of the bath or the edge of the tray. If a bath or tray moves when you stand in it, get it looked at.
Report failed sealant to the builder while you’re in the snagging period. Once it ends, the repair may be down to you.
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours for most snagging lists, longer for a run of plots. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Westminster. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
- We clean off dust from the build and prime the surfaces where the product needs it.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Each area is checked and left with its cure time.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
Want a quote for new build mastic? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear quote before work begins.
Related advice
Why act early in Westminster
A tube of sealant from the DIY shop will not fix the cause: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Westminster, the repair is bigger than the sealant job would have been.
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- You choose the colour before work begins
- Over 20 years’ experience
- Any old sealant cut out fully, not covered over
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
New build mastic in Westminster: local notes
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. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
If you’ve bought a new home near London Victoria station, the sealant around baths, showers and frames is worth checking in the first year or two.
Westminster is about 1 mile south-east of City of Westminster, in Greater London. We carry out new build mastic for homes and businesses in Westminster, as part of our work across Greater London. Westminster is one of 764 towns and villages in Greater London where we work for new build mastic.
All of SW1P, W1J and SW1V is covered for new build mastic. That includes homes and businesses on Eaton Lane, Wilton Road and Castle Lane. Westminster sits on or near the A4 and A202, which makes travel easy. If you are just outside Westminster, we cover Millbank (1 mile north), Victoria (1 mile south-west), Pimlico (1 mile south), Vauxhall (1 mile south-east) and Lambeth (1 mile south-east). Within a short drive, we also cover Kensington (3 miles west), Shoreditch (3 miles north-east), Walthamstow (8 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles north-east) and Hampstead (4 miles north-west).
Near you in Westminster
Locally, jobs take us to homes and businesses close to St Matthew's School, St James's Park and Blewcoat School and the streets around them. Also close by are London Library (0.6 miles north) and Grafton Arms (less than half a mile south). Westminster’s nearest station is London Victoria station, roughly 0.6 miles south-west of the centre. Other landmarks nearby include Westminster Hospital (less than half a mile east) and The Crime Museum (less than half a mile south). The countryside around Westminster includes Barnsbury Wood and St. James's Park Lake.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Also in Westminster
How the job changes by surface
Show homes
We seal show-home bathrooms, kitchens and frames. Tell us when the home is open so we can plan around it.
Bathrooms and en suites
En suite showers are a common source of leaks into the room below. Resealing properly keeps water where it belongs.
Do you need new build mastic in Westminster?
The first winter with the heating on dries a new home quickly. Gaps open along skirting, frames and worktops and cracked sealant shows up.
These are the problems we are asked about most:
- Cracked caulk along new skirting
- Sealant work across a run of new homes
- New-build shower sealant that has already split
- Internal frame sealant that has split
Westminster is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What to look for in a quote
- When the joint can take water or movement
- How the joint is cleaned and prepared
- How much experience the applicator has
- How hidden problems are handled