Greater London · England
New-build mastic & snagging in Three Mills, Greater London
We cover Three Mills for plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Gaps between new skirting and floors
- Leaking shower tray seals in a new home
- Sealant that never bonded to the surface
New build mastic in Three Mills
Some new-home owners let the house settle before resealing. For small cosmetic gaps, that’s reasonable, but a failed shower or bath seal shouldn’t wait. If you have skirting joints opening in the first winter and kitchen sealant that has pulled off the wall, we can help.
Across London, commercial floors have movement joints that break down under heavy foot traffic, while new homes need a neat, sound finish around frames, baths and kitchens before handover.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Place
- Three Mills (E3, E15, E14)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
How it works
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours for most snagging lists, longer for a run of plots. For a job in Three Mills, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- The failed sealant is removed completely down to clean surfaces.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Preparing for the visit
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or email us and describe the job and send pictures if you have them.
Related advice
When to call us in Three Mills
Sealant is often one of the last jobs before handover. Dusty, unprimed joints are common, and the sealant sits on grit instead of the surface.
Look out for these signs:
- Shower seals failing in the first year or two
- Gaps behind new kitchen upstands
- Sealant work across a run of new homes
- Smeared, uneven beads picked up at snagging
As a London address, Three Mills can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- How the surfaces are prepared before sealing
- Which colour the sealant will be
- What happens if they find a problem under the old sealant
- Which sealant they’ll use, and why
Nearby places to Three Mills
Other services in Three Mills
Aftercare tips
A little care helps the new joints last. We recommend:
- Act quickly if a seal starts to leak
- Clean sealant with mild detergent, not abrasives
- Follow the cure time we give you
- Raise failed sealant with the developer while you are covered
Ventilation matters in a new home, which is still drying out. Use the extractor fan or open a window after showers to help keep mould away.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small.
Why act early in Three Mills
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it won’t bond to the old layer. Taking it all out and starting again is the only way to get a lasting seal. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Three Mills, the repair is bigger than a sealant job.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
What you get with us
- ARBOMaster approved applicator
- 180+ five-star Google reviews
- Neat joints and a tidy finish
- Any old sealant cut out fully, not covered over
Read how sealant jobs are priced and customer reviews.
Your questions about new build mastic in Three Mills
Do you cover Three Mills for new build mastic?
Yes, Three Mills is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for landlords with property near West Ham 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 we start.
Will it make a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Will you just run a new bead over the existing one?
No. New silicone will not bond to old silicone, so it soon lifts and traps water. The old sealant always comes out first.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you take on second-fix sealing for builders?
Yes. We seal plots to the developer’s programme ready for handover. Tell us the plots and the joints involved for a clear quote.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we are using and why.
Is the work guaranteed?
Yes. Each job is guaranteed for twelve months, large or small.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured.
New homes and floors in Three Mills
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. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
For new homes near West Ham station, it’s worth checking the sealant early, while snags are still fresh.
Three Mills is about 1 mile south of Stratford, in Greater London. Homes, rented property, offices and hotels in Three Mills is covered for new build mastic. Every job comes with our 12-month guarantee. Across Greater London, we cover 764 places, Three Mills among them.
Every address in E3, E15 and E14 is within our area for new build mastic, from the main roads to the quietest streets. If you need new build mastic at a property on Gay Road, Bruce Road and Edgar Road or a nearby road, we can help. We also cover Mill Meads (1 mile north), Bromley (1 mile south-west), Old Ford (1 mile north-west), Bow (1 mile west) and Bow Common (1 mile south-west). Within a short drive, we also cover London (4 miles south-west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (9 miles west), St Pancras (5 miles west) and Shoreditch (3 miles west).
Around Three Mills
We work in homes and buildings around Manorfield Primary School, London International School of Performing Arts and Bob's Park and the streets around them. For rail, the closest station is West Ham station, roughly 0.5 miles east. Well-known places in the area include Stratford Centre (1 mile north) and St Clement's Hospital (0.9 miles west). Not far away are Hollow Pond and Old Ford Island.
What sealant work can’t fix
Sealant is not the answer to every problem, and we’ll tell you before any work starts. Sealant will not put right:
- Damaged fittings that need replacing
- Structural cracks in walls or ceilings
- Leaking fittings rather than failed sealant
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Three Mills
- Skirting & floors
- Bathrooms & en suites
- Windows & doors
- Plot handovers
- Kitchens
- Show homes