Greater London · England
New-build mastic & snagging in Shadwell, Greater London
New build mastic across Shadwell and nearby, with old sealant always removed completely and a one-year guarantee.
- Shower seals failing in the first year or two
- Smeared, uneven beads picked up at snagging
- Sealant that never bonded to the surface
Quotes for new build mastic in Shadwell
Jobs vary more than people expect. What affects the quote:
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- The number and length of the joints
- How many rooms, windows or areas are involved
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
What we need to know
What to tell us when you ask for a quote:
- Where the property is
- Whether it’s a home or a business
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you are ready, call 0345 464 0079 or email us.
How we handle new build mastic in Shadwell
We work in new homes and on new-build sites across Shadwell. Whether it’s one en suite or a run of plots, the method is the same: remove, clean, prime where needed, then a neat new bead. Typical jobs include leaking shower tray seals in a new home and cracked sealant around new window and door frames, across bathrooms & en suites, plot handovers and skirting & floors.
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.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Shadwell (SE16, E1, E1W)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes a few hours for most snagging lists, longer for a run of plots in most cases. In Shadwell, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- 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.
Getting ready for the visit
- Keep children and pets away from the work area
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Related advice
What sealant work can’t fix
To be straight with you, some problems need a different trade:
- Leaking fittings rather than failed sealant
- Damaged fittings that need replacing
- Cracking that points to a structural problem
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Where we work in Shadwell
- Show homes
- Bathrooms & en suites
- Plot handovers
- Skirting & floors
- Kitchens
- Windows & doors
Leave it or put it right?
Resealing everything on a snagging list in one visit is generally simpler than chasing joints one at a time. It’s one visit, one quote and one set of cure times for the lot. In a flat in Shadwell, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and send you a clear quote before we start.
Why us?
- Colour agreed with you before work begins
- We’re fully insured
- A 12-month guarantee on all work
- Homes, businesses and hotels
Read what affects the cost and what customers say.
Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
New build mastic in Shadwell: local notes
Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Shadwell is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you’ve bought a new home near Wapping station, the sealant around baths, showers and frames is worth checking in the first year or two.
Shadwell is about 1 mile south-east of Whitechapel, in Greater London. From the centre of Shadwell to the outskirts, we cover new build mastic for every kind of property. Across Greater London, we cover 764 places, and Shadwell is one of them.
Work in SE16, E1 and E1W is quoted and booked the same way as anywhere else. You’ll find streets such as Swan Road, Thame Road and Brunel Road, and we cover them all. Shadwell sits on or near the A101 and A126. Other places close to Shadwell include Ratcliff (1 mile north), East End of London (1 mile north-west), Wapping (1 mile west), St George in the East (1 mile west) and Limehouse (1 mile north-east). We also work in nearby towns such as City of Westminster (5 miles west), Marylebone (4 miles west), Kensington (7 miles west), St Pancras (3 miles north-west), Walthamstow (6 miles north) and Hampstead (7 miles north-west).
Local landmarks in Shadwell
Typical jobs here are in homes near Bacon's College, Bishopsgate Institute Special Collections and Archives and Russia Dock Woodland and the streets around them. Nearby too are Prospect of Whitby pub (under half a mile west) and St Mellitus College (0.6 miles west). Shadwell has its own railway station: Wapping station. Nearby you will also find St Olave's Hospital (0.8 miles south-west) and The Pumphouse Educational Museum (within half a mile east). For a walk, there’s Lavender Pond and Tower Hill.
Shadwell questions
Can you do new build mastic in Shadwell?
Yes. We work across London and the South East, and Shadwell is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Do you work for landlords with property near Wapping station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Can you work on commercial sites?
Yes. Larger jobs can be planned room by room or area by area.
What colour sealant will you use?
It depends on the joint: white or clear in most bathrooms, and a colour to suit worktops, frames and floors elsewhere. We agree the colour before any work starts.
How long does the job take?
A typical job takes anything from a few hours to several days, depending on the number of plots. We will confirm how long when we quote.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Will there be a smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Are you insured?
Yes. Mr Mastic is fully insured.
How to look after the new joints
Aftercare is simple:
- Avoid scourers and strong chemicals on sealant
- Ventilate bathrooms well, especially in the first year
- Check bath and shower seals every few months as the house settles
- Keep water off fresh sealant until it has cured
Keep the bathroom ventilated, especially in the first year. Use the extractor fan or open a window after showers so moisture doesn’t sit on the sealant.
Early snagging is easier snagging. Small faults turn into leaks if left in a busy bathroom.
Landlord and commercial work in Shadwell
Landlords and agents in Shadwell can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.