Greater London · England
Hoxton External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Hoxton, backed by a one-year guarantee. Call for a quick quote.
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
- Panel joints letting water in
Common problems we fix in Hoxton
If plants are growing out of a joint, the sealant has normally failed or was never there. Dirt and roots then trap moisture in the joint.
Common reasons people contact us include:
- Leaking joints around cladding and façade panels
- Brick movement joints where the sealant has split
- Rigid filler in a joint that should flex
- Failed seals between different materials
In the older streets around Church of St Anne with St Columba, an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- How long to leave it before use
- Who turns up on the day
- What product goes in the joint
- What happens if the job turns out different
External mastic in Hoxton
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what access is needed. We work on façade panels, joints between brick and frames and copings & trims, and the jobs we see most are moss and dirt in joints with no sealant left and cracked joints where brick meets render or frames.
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. For a flat in Hoxton, check the lease for who looks after the outside.
You’re covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Location
- Hoxton (N1, N1P, EC1V)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
A failed movement joint lets water into the wall and can run behind render or cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in Hoxton.
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins, so you know where you stand.
Why book with us
- Colour picked to suit the job
- White, clear, grey or coloured to suit, where the product allows
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
Hoxton questions
Is parking a problem for a job in Hoxton?
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.
I let a flat near Hoxton station. Can you help?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Hoxton, along with the rest of our area.
How do you reach high-level joints?
It depends on the building. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Get split or bare joints resealed while the damage is small
- Wash walls gently around the sealant
- Keep water from gutters off the wall
- Show decorators and builders where the movement joints are
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
Quotes for external mastic in Hoxton
The price is agreed before any work begins. It takes into account:
- How much there is to do
- Working hours on commercial sites
- Mould in or behind the old joints
- The type of sealant required
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
To help us quote quickly, please include:
- Whether it’s a home or a business
- A few pictures by email, if you can
- Any previous sealing or DIY work
- How we’d reach the joints
For external mastic in Hoxton, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.
What we can’t put right
We’d rather tell you now than do work that won’t last, so these are the limits:
- Movement that’s more than a sealant joint can take
- Walls that need new movement joints cut into them
- Cracks in the bricks or render themselves, away from the joints
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Façade panels
Towns and villages near Hoxton
What else we do in Hoxton
Hoxton buildings and the weather
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. With historic houses such as Mansion House (about 1.4 miles south) nearby, there’s older building stock in the area around Hoxton as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Hoxton is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Rented homes near Hoxton station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Hoxton is about 2 miles north of London, in Greater London. From the centre of Hoxton to the outskirts, external mastic is available for homes and businesses alike. Hoxton is one of 764 towns and villages in Greater London where we work.
Jobs for external mastic in N1, N1P and EC1V works the same way as everywhere else we cover. Local streets include City Road, Noel Road and East Road. With the A1200 and A1208 close by, Hoxton is simple for us to get to for external mastic. Neighbouring places we cover for external mastic include Haggerston (1 mile east), Shoreditch (1 mile south-east), Canonbury (1 mile north), De Beauvoir Town (1 mile north) and St Luke's (1 mile south-west). Further out, we also cover City of Westminster (3 miles south-west), Marylebone (3 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east), Hampstead (4 miles west) and Ruislip (14 miles west). As one of the bigger places in Greater London, Hoxton has homes, rented property and businesses of every kind.
Local landmarks in Hoxton
We work in homes and buildings around Bishopsgate Institute Special Collections and Archives, Islington Green School and Stag's Head pub. Other local landmarks include Hackney University Technical College (under half a mile south-east) and Shoreditch Park (within half a mile north-west). There’s a railway station in Hoxton itself: Hoxton station. A little further out are St Leonard's Hospital (less than half a mile east) and Montfichet's Tower (1.6 miles south-west). The countryside around Hoxton includes St. James's Park Lake and Barnsbury Wood.
What the job involves on each surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Copings and trims
Coping and trim joints face rain and sun head on. Each is resealed with a weatherproof, flexible sealant.
The process
The work is kept neat and contained to the area we are working on. Expect the work to take anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. In Hoxton, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Keep children and pets away from the work area
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
Get a quote
Asking for a quote is easy: tell us what needs doing and where. A few photos by email make the job easier to understand.