Greater London · England
External & façade joints in Bow, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Bow. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Moss and dirt in joints with no sealant left
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
External mastic in Bow, done properly
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. If you have leaking joints around cladding and façade panels and rain getting behind render or cladding at a joint, we can put it right, on brickwork movement joints, copings & trims and concrete & block alike.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in Bow, it’s worth checking who is responsible for the outside before booking.
You get a 12-month guarantee, the same in Bow as everywhere else we work.
- Place
- Bow (E3)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need external mastic in Bow
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
People normally contact us when they notice something like this:
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Sealant pulling away from one side of the joint
Homes close to St Paul Old Ford include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- Whether VAT is included
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are
- Whether they seal over old material or remove it
When something else is needed
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracked brickwork or render that needs a builder or plasterer
- Loose or hollow render, which needs re-rendering
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Where we work in Bow
- Façade panels
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
More services for Bow
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
Aftercare tips
So the new joints stay in good condition:
- Keep movement joints as flexible joints, not mortar
- Point out the joints to other trades
- Wash walls gently around the sealant
- Deal with leaking gutters that soak the joints below
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants are not designed to be painted.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Surface by surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it, or one the system allows. Send us any details you have about the façade.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.
Why act early in Bow
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- More than 20 years in sealant work
- Homes, businesses and hotels
- 4.9 on Google from 180+ five-star reviews
- Sealant colour chosen to suit
How the visit works
A visit follows a simple pattern: we check the joints, protect the area around them, carry out the job and clear up. It normally takes anything from a few hours to several days, depending on the building. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Bow. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Try not to wet indoor joints just before the visit
- Clear the area around the work
- Let us know about earlier repairs to the joints
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work.
Related advice
Common questions in Bow
Is parking an issue for external mastic in Bow?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can you do external mastic in Bow?
Yes, Bow is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding.
Can you reach joints on upper floors?
Each building is different. Tell us the height, the number of joints and what’s below them, and we will confirm what access is needed.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages.
Are you insured?
Yes. We’re fully insured for every job we do.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
How much does external mastic cost in Bow?
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.
What external mastic looks like in Bow
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. 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.
Rented homes near Hackney Wick station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. As a London address, Bow can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Bow is about 1 mile south-east of Hackney, in Greater London. Anywhere in E3, we cover external mastic for homes and businesses. Across Greater London, we cover 764 places, Bow among them.
Work in E3 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Trellis Square, Sheffield Square and Bromley High Street or a nearby road, our applicators can take on the job. With the B142 close by, Bow is easy for our applicators to reach. If you are just outside Bow, we cover Donnybrook Quarter (1 mile north), Old Ford (1 mile north-east), Mile End (1 mile south), Fish Island (1 mile north) and Bromley (1 mile south-east). Further out, we also cover London (4 miles south-west), City of Westminster (6 miles west), Marylebone (5 miles west), Kensington (8 miles west), St Pancras (4 miles west) and Walthamstow (4 miles north).
Landmarks near Bow
Typical jobs here are in homes near Lord Tredegar Public House, Grove Hall Park and Mulberry UTC, among other places. The nearest railway station is Hackney Wick station, about 0.9 miles north of the centre. Well-known places in the area include V&A East (0.9 miles north-east) and St Clement's Hospital (less than half a mile south). For a walk, there’s Hollow Pond and Old Ford Island.