Greater London · England
External & façade joints in Bankside, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Bankside. Fully insured, ARBOMaster approved and guaranteed for a year.
- Moss and dirt in joints with no sealant left
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
External mastic for homes and businesses in Bankside
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing. If you are dealing with plants rooting in failed movement joints and joints with sealant missing in places, we can help.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall, and both kinds of building are found across London.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Bankside (SE1, EC4Y, EC4V)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
External mastic in Bankside: local notes
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to St Mary Mounthaw include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. For landlords with property near London Blackfriars station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. As a London address, Bankside can be tricky for parking: let us know about parking bays, permits or a driveway.
Bankside is about 1 mile north of London, in Greater London. Wherever you are in the SE1 postcode area, we can carry out external mastic at your property. Bankside is one of 764 places in Greater London where we work.
We work across SE1, EC4Y and EC4V for external mastic. You’ll find streets such as Bear Lane, Bush Lane and Swan Lane. Being close to the A201 and A300, Bankside is easy for our applicators to reach. If you are just outside Bankside, we cover Blackfriars (1 mile north-west), Temple (1 mile north-west), Temple Bar (1 mile north-west), Waterloo (1 mile south-west) and Smithfield (1 mile north). We also work in nearby towns such as Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (5 miles north-west), Ruislip (14 miles west), Brompton (3 miles west) and Stockwell (3 miles south).
Around Bankside
Around Bankside, our work takes us to homes and buildings near St Mary-at-Hill, Bernie Spain Gardens and St Andrew's and St John's Church of England Primary School and the streets around them. Nearby too are Barts Health Archives (0.6 miles north), The Cathedral School of St Saviour and St Mary Overy (0.5 miles south-east) and Founders Arms (less than half a mile west). Bankside has its own railway station: London Blackfriars station. A little further out are Royal Waterloo Hospital for Children and Women (0.6 miles west) and Gabriel's Wharf (less than half a mile west). For a walk, there’s Ludgate Hill and Barnsbury Wood.
What sealant work can’t fix
In fairness, some problems need a different trade:
- Cracks in the bricks or render themselves, away from the joints
- Loose or hollow render, which needs re-rendering
- Damp that isn’t coming from the joint
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
What we seal
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Façade panels
The process
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours to a few days, depending on the length of joint and the access. In Bankside, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Tell us about any water getting in
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Advice
Also near Bankside
Also in Bankside
Your questions about external mastic in Bankside
Can you do external mastic in Bankside?
Yes, Bankside is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
Can you help a landlord with a rental near London Blackfriars station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we are using.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
How much does external mastic cost in Bankside?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
Do you work at height?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
Leave it or put it right?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Bankside.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- Tidy, careful work
- Full insurance on every job
- A sealant colour to suit the surroundings
- You choose the colour before work begins
Take a look at how sealant jobs are priced and customer reviews.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Keeping the joints in good condition
Looking after new joints is easy:
- Leave the joints unpainted unless we have said otherwise
- Deal with leaking gutters that soak the joints below
- Keep high-pressure jets off the joints
- Tell anyone working on the walls about the movement joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- How easy the joints are to reach
- The number and length of the joints
- Whether old sealant or filler has to be cut out
- The type of sealant required
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts.
Asking for a quote
To make quoting easier, let us know:
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
For landlords and businesses
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.