Greater London · England
Brixton External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Brixton, backed by a 12-month guarantee. Ask us for a quote.
- Weathered mastic that no longer stretches
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
External mastic for homes and businesses in Brixton
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. If you have rigid filler in a joint that should flex and weeds or debris growing in open joints, we can put it right, whatever the surface.
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.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Location
- Brixton (SW2, SW9, SW4)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Places near Brixton
What else we do in Brixton
How the visit works
There’s no need to move everything out, just the space around the work. Everything nearby is protected, and the job takes a few hours for a handful of joints, longer for a whole elevation in most cases. In Brixton, 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.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Tell us if parking is tricky
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.
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What affects the quote in Brixton
Every job gets its own quote. These are the things that affect it:
- How many areas need sealing
- Any working-time requirements on site
- The amount of work
- Mould in or behind the old joints
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and send you a clear quote before we start.
What we need to know
Before you ask for a quote, have a think about:
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- Whether it has been sealed before
- A few pictures by email, if you can
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Look over the joints every year, ideally after winter
- Never let anyone fill a movement joint with mortar
- Point out the joints to other trades
- Act on the first splits you see
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted and spoil the finish.
Once a joint cannot move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
What we’re called out for in Brixton
Using the wrong sealant is another common reason. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
It’s worth asking for a quote if you see:
- Rigid filler in a joint that should flex
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
- Old sealant gone brittle and cracked
As a London address, Brixton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- How the joint is cleaned and prepared
- How much experience the applicator has
- The length of the guarantee
- What happens if they find a problem under the old sealant
Outside joints around Brixton
Historic houses like Kingswood House (about 2.4 miles south-east) are a reminder that the area around Brixton has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Sudbourne Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Trinity Congregational Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Brixton is about 1 mile south of Stockwell, in Greater London. For external mastic in and around Brixton, please phone 0345 464 0079 or drop us an email for a quick quote. We cover Greater London from our Crawley base. Brixton is one of 764 towns and villages in Greater London we cover.
Work in SW2, SW9 and SW4 works the same way as everywhere else we cover. We cover properties on Acre Lane, Jelf Road and Trent Road. Main roads around Brixton include the A204 and A2217, which makes travel easy. We also cover the places around Brixton: Stockwell (1 mile north), Clapham Park (1 mile west), Angell Town (1 mile north), Loughborough Junction (1 mile north-east) and Tulse Hill (1 mile south-east). Larger places within reach include London (3 miles north), City of Westminster (4 miles north), Marylebone (4 miles north), Kensington (5 miles north-west), St Pancras (5 miles north) and Shoreditch (5 miles north).
What’s near Brixton
We work in homes and buildings around Trinity Arms, Max Roach Park and Trinity Academy and the streets around them. There’s a railway station in Brixton itself: Brixton station. A little further out are London General Cab Company Museum (0.9 miles north) and Baynard's Castle (3.8 miles north). Not far away are Battersea Park Lake and Centre for Wildlife Gardening.
Why it’s worth doing now in Brixton
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render near the open joint, so the damage spreads beyond the joint. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Brixton, the repair is bigger than the sealant job would have been.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- Over 20 years’ experience
- One-year guarantee on every job
- Approved under the ARBOMaster scheme
- Full insurance on every job
Read our cost guide or our reviews.
Common questions in Brixton
Can you do external mastic in Brixton?
Yes. Our work covers London and the South East, and Brixton is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Is parking an issue for external mastic in Brixton?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
When is the sealant fully cured?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
How long does external mastic take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the building. We will tell you when we quote.
How do you reach high-level joints?
It depends on the building. We work on joints that can be reached safely. Tell us about the building and we’ll confirm what access is needed.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.