Greater London · England
North Brixton External Mastic
External mastic for North Brixton and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Movement joints filled with mortar instead of sealant
- Leaking joints around cladding and façade panels
- Sealant that has lost its bond to the brick or render
External mastic for homes and businesses in North Brixton
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. If you have hard, crazed mastic that has stopped moving and damp patches traced to an open external joint, we can help, on joints between brick and frames, copings & trims and façade panels alike.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in North Brixton, it’s worth checking who is responsible for the outside before booking.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- North Brixton (SW9, SW8, SE5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
North Brixton questions
Can parking be tricky for a visit in North Brixton?
Parking in North Brixton, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Is North Brixton in your area for external mastic?
Yes. Our work covers London and the South East, and North Brixton is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.
What should I tell you?
A short description and the location, with photos by email if possible. We will ask anything else we need to know.
Places near North Brixton
What else we do in North Brixton
Aftercare tips
After the cure time, these simple habits help:
- Tell anyone working on the walls about the movement joints
- Leave the joints unpainted unless we’ve said otherwise
- Avoid pressure-washing directly into sealant joints
- Never let anyone fill a movement joint with mortar
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.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
How the job changes by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Walls and rooflines in North Brixton
Historic houses like Buckingham Palace (about 2.3 miles north-west) are a reminder that the area around North Brixton has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
Schools such as Van Gogh Academy are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. If you live in an older home near St Michael's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
North Brixton is about 2 miles south-west of London, in Greater London. North Brixton gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 764 places across Greater London, from the larger towns to small villages.
We cover every part of SW9, SW8 and SE5 for external mastic. If you need external mastic at a property on Lett Road, Lorn Road and Oak Square or a nearby road, we can help. North Brixton sits on or near the A203, which makes travel easy. We also cover the places around North Brixton: Angell Town (1 mile south), Little Portugal (1 mile west), Stockwell (1 mile south-west), South Lambeth (1 mile north-west) and Kennington (1 mile north-west). Larger places within reach include City of Westminster (3 miles north-west), Marylebone (3 miles north-west), Kensington (4 miles north-west), St Pancras (4 miles north), Shoreditch (4 miles north-east) and Walthamstow (9 miles north-east).
Landmarks near North Brixton
In North Brixton, that means homes and buildings near The Crown & Anchor pub, Lambeth Palace Library and Durand Academy and the streets around them. You’ll also find Max Roach Park (0.5 miles south) and Platanos College (less than half a mile west). North Brixton’s nearest station is Loughborough Junction station, about 0.7 miles south-east of the centre. Well-known places in the area include Type Museum (under half a mile west) and St Giles' Hospital (1.3 miles east). Not far away are Battersea Park Lake and Knight's Hill.
Do you need external mastic in North Brixton?
Some movement joints have been pointed up with mortar by mistake. The joint cannot move, so the wall cracks somewhere else instead.
Any of these means the joints need attention:
- Brick movement joints where the sealant has split
- Sealant that has lost its bond to the brick or render
- Joints pointed up with cement by mistake
- Water getting into walls through failed joints
As a London address, North Brixton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before you book anyone
- How the surfaces are prepared before sealing
- Is the old sealant removed completely?
- Which sealant they’ll use, and why
- Who turns up on the day
Honest limits
We’d rather tell you now than do work that will not last, so these are the limits:
- Failed render or damaged cladding panels
- Structural movement, which needs a surveyor or engineer
- Cracking across the wall rather than at a joint
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Surfaces we seal
- Render & cladding joints
- Façade panels
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
How it works
You do not need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
- Mention any parking rules near the property
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Read more
Why deal with it now?
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. 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. Dealing with it early is far simpler.
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why North Brixton clients choose us
- We agree the colour with you first
- Sanitary silicone with an anti-fungal additive in wet areas
- More than 20 years in sealant work
- Every job guaranteed for a year
See our cost guide and customer reviews.
Landlord and commercial work in North Brixton
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.