Greater London · England
St George in the East New Build Mastic
New build mastic in St George in the East from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant that never bonded to the surface
- Cracked sealant around new window and door frames
- Gaps opening as the house dries out and settles
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Record problems with dated pictures
- Clean sealant with mild detergent, not abrasives
- Follow the cure time we give you
- Get a leaking seal dealt with straight away
Follow the cure time we give you before the area gets wet. Silicone is normally left for about a day to cure enough for use.
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.
How we handle new build mastic in St George in the East
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. We work on windows & doors, skirting & floors and kitchens, and people most often call us about beads laid onto grit and dust from the build and internal frame sealant that has split.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, and new homes need their plot mastic finished properly before handover, in St George in the East and beyond.
All our work is covered by a one-year guarantee, wherever you are in Greater London.
- Location
- St George in the East (E1, E1W, SE16)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to several days, depending on the number of plots from start to finish. In St George in the East, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out down to clean surfaces.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
- Let us know if you’ve seen damp or leaks
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, call 0345 464 0079 or send us an email.
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Landlord and commercial work in St George in the East
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Housing providers, facilities teams and property managers book us too in St George in the East and across Greater London. Several sites can be quoted together, and we’re fully insured for the work.
What we cannot put right
To be straight with you, there are a few things sealant will not fix:
- Cracking that points to a structural problem
- A tray or bath that is not properly supported, until it’s fixed
- Deciding who is responsible under a builder’s warranty
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Windows & doors
- Skirting & floors
- Kitchens
- Plot handovers
- Bathrooms & en suites
- Show homes
DIY versus a professional finish
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Quotes for new build mastic in St George in the East
The quote reflects the job in front of us. We look at:
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- Any mould that needs treating
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 we need extra access for height. Your quote takes all of that into account.
Helping us quote
When you contact us, it’s useful to know:
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- Where the property is
If you’re in St George in the East and need new build mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Joints and finishes in St George in the East homes
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
As a London address, St George in the East can be tricky for parking: let us know about parking bays, permits or a driveway. If you’ve bought a new home near Shadwell station, the sealant around baths, showers and frames is worth checking in the first year or two.
St George in the East is about 1 mile south-east of Whitechapel, in Greater London. Every kind of property in St George in the East can book us for new build mastic. The work is guaranteed for a year. St George in the East is one of 764 towns and villages in Greater London where we work for new build mastic.
We cover every part of the E1, E1W and SE16 postcode area for new build mastic and the streets around it. If you need new build mastic at a property on Glamis Road, Redmead Lane and Wapping Lane or anywhere close by, we can help. With the A1210 and A1211 close by, St George in the East is simple for us to get to. Close by, we work in Wapping (1 mile south-east), East End of London (1 mile north-east), Whitechapel (1 mile north-west), Tower Hill (1 mile west) and Shadwell (1 mile east). Further out, we also cover City of Westminster (4 miles west), Marylebone (4 miles west), Kensington (6 miles west), St Pancras (3 miles north-west), Walthamstow (6 miles north) and Hampstead (6 miles north-west).
Landmarks near St George in the East
In St George in the East, that means homes and buildings near St Mellitus College, Mulberry School for Girls and Bishopsgate Institute Special Collections and Archives. Nearby too are Town of Ramsgate pub (within half a mile south), William Curtis Ecological Park (0.7 miles west) and St Mary-at-Hill (0.9 miles west). St George in the East has its own railway station: Shadwell station. A little further out are Jack the Ripper Museum (under half a mile north-west) and The Royal London Hospital (0.7 miles north). Open spaces near St George in the East include St. James's Park Lake and Tower Hill.
Questions from St George in the East
Can parking be tricky for a visit in St George in the East?
Parking in St George in the East, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you cover St George in the East for new build mastic?
Yes, St George in the East is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Can you reseal over the builder’s sealant?
No. We always remove the existing bead, the joint cleaned and primed where needed, before resealing.
When is the best time to reseal in a new build?
For failed seals that let water through, the best time is now. Cosmetic gaps can wait until the first year or two of movement has passed.
Is the work guaranteed?
Yes, for a year. If anything is not right with the work within the year, let us know and we’ll sort it.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
How long does new build mastic take?
A typical job takes a few hours for most snagging lists, longer for a run of plots, including the preparation. Your quote will say how long we expect yours to take.
Why has my new-build shower seal failed already?
Lots of new homes see sealant crack early, because the house is drying and settling. Poor preparation at handover adds to it.
What the job involves on each surface
Show homes
We seal show-home bathrooms, kitchens and frames. Tell us when the home is open so we can plan around it.
Kitchens
As a new house dries, worktops and walls shift a little, which opens gaps along the back. A fresh flexible bead closes them.