Greater London · England
Bethnal Green External Mastic
We cover Bethnal Green for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Sealant that has lost its bond to the brick or render
- Failed sealant between panels on a façade
- Movement joints with cracked, split or missing sealant
Different surfaces, different methods
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
About our external mastic in Bethnal Green
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We take the old material out and do it properly. If you’re dealing with failed seals between different materials and leaking joints around cladding and façade panels, we can help, on render & cladding joints, façade panels and concrete & block alike.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Bethnal Green, it’s worth checking who is responsible for the outside before booking.
Each job carries a 12-month guarantee, large or small.
- Where
- Bethnal Green (E2, E1, E3)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Bethnal Green buildings and the weather
With historic houses such as Sutton House (about 1.4 miles north) nearby, there’s older building stock in the area around Bethnal Green as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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.
Homes close to St Peter's include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as Lawdale Junior School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Bethnal Green is about 3 miles north-east of London, in Greater London. From the centre of Bethnal Green to the outskirts, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our area takes in 764 places across Greater London, from the larger towns to small villages.
Work in E2, E1 and E3 is quoted and booked the same way as anywhere else. That includes homes and businesses on Patriot Square, Ion Square and Victoria Park Square and the roads around them. With the B108 and B118 close by, Bethnal Green is easy for our applicators to reach. Neighbouring places we cover for external mastic include Cambridge Heath (1 mile north-east), London Fields (1 mile north), Shoreditch (1 mile west), Haggerston (1 mile north-west) and Stepney (1 mile south-east). We also work in nearby towns such as London (3 miles south-west), City of Westminster (4 miles west), Marylebone (4 miles west), Kensington (6 miles west), Walthamstow (4 miles north) and Hampstead (5 miles west).
Local landmarks in Bethnal Green
We work in homes and buildings around Oaklands School, Bishopsgate Institute Special Collections and Archives and Bethnal Green Gardens and the streets around them. Nearby too are Young and Talented School of Stage and Screen (less than half a mile south) and Sebright Arms (under half a mile north-west). Bethnal Green has its own railway station: Cambridge Heath station. Other landmarks nearby include Hackney Walk (1.3 miles north) and London Chest Hospital (0.5 miles east). For a walk, there’s St. James's Park Lake and Tower Hill.
Nearby places to Bethnal Green
What else we do in Bethnal Green
What sealant work cannot fix
We’ll always be straight with you, so here’s what sealant cannot fix:
- Walls that need new movement joints cut into them
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Render that is blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Bethnal Green
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Façade panels
Common problems we fix in Bethnal Green
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and speed up the damage.
Common reasons people contact us are:
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Leaking joints around cladding and façade panels
- Weeds or debris growing in open joints
Letting a property close to Cambridge Heath station? Then split movement joints are easy to miss on a rental until damp shows inside.
Before you book anyone
- Who turns up on the day
- What insurance they hold
- How long to leave it before use
- Whether VAT is included
How it works
When we arrive, we start by going over the job with you. We protect the surfaces around the joints before any work starts. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a job in Bethnal Green, 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.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
Getting a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved.
Read more
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Common questions in Bethnal Green
Can you do external mastic in Bethnal Green?
Yes. Our work covers London and the South East, and Bethnal Green is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Is parking an issue for external mastic in Bethnal Green?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you when we finish.
Do you have insurance?
Yes. We’re fully insured, and we can confirm the details when we quote.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
How much does external mastic cost in Bethnal Green?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we will talk you through it.
Leave it or put it right?
Resealing a run of joints in one go is generally better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Bethnal Green, the repair is bigger than the sealant job would have been.
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
Why Bethnal Green customers choose us
- White, clear, grey or another colour, product permitting
- Domestic, commercial and hotel work
- 180+ five-star Google reviews
- Colour picked to suit the job
Take a look at our cost guide or what customers say.
What affects the quote in Bethnal Green
There’s no set price list, because jobs vary so much. The quote depends on:
- Which sealant suits the joint
- Any mould that needs treating
- How many rooms, windows or areas are involved
- Any working-time requirements on site
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Asking for a quote
To help us quote quickly, let us know:
- Where the property is
- Roughly how big the job is
- The problem you’ve noticed
- Any access issues, like height or stairs
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.