Greater London · England
Little Portugal External Mastic
External mastic for Little Portugal and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
External mastic in Little Portugal, done properly
For buildings in Little Portugal, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you’re dealing with panel joints letting water in and weeds or debris growing in open joints, we can put it right.
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. For a flat in Little Portugal, check the lease for who looks after the outside.
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
- Little Portugal (SW9, SW8, SW1P)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How it works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. Most jobs take a few hours to a few days, depending on the length of joint and the access. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Little Portugal. It helps if you can point us to a visitor permit or a bay close to the door.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Let us know about parking restrictions
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or drop us an email with the details, and pictures are welcome.
Advice
Towns and villages near Little Portugal
What else we do in Little Portugal
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- The number and length of the joints
- The product the joint needs
- The old material and how stubborn it is
- Access and height
What it costs depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- Roughly how big the job is
- Where the job is, and your postcode
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
Looking after it afterwards
So the new joints stay in good condition:
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
- Have failed joints looked at early
- Ask before painting over external sealant
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
What we can’t put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Damp that isn’t coming from the joint
- Movement that is more than a sealant joint can take
- Cracks in the bricks or render themselves, away from the joints
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Where we work in Little Portugal
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Concrete & block
- Render & cladding joints
- Copings & trims
Walls and rooflines in Little Portugal
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as St Stephen's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Managing a site like Platanos College? Then larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Wandsworth Road station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Little Portugal is about 1 mile north of Stockwell, in Greater London. Whether you’re in the middle of Little Portugal or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, Little Portugal among them.
We cover every part of the SW9, SW8 and SW1P postcode area for external mastic. You will find streets such as Kay Road, Lett Road and Rita Road, and we cover them all. Main roads around Little Portugal include the A203. We also cover the places around Little Portugal: South Lambeth (1 mile north), North Brixton (1 mile east), Stockwell (1 mile south), Kennington (1 mile north) and Oval (1 mile north). We also work in nearby towns such as City of Westminster (3 miles north-west), Marylebone (3 miles north), Kensington (4 miles north-west), St Pancras (4 miles north), Shoreditch (4 miles north-east) and Walthamstow (9 miles north-east).
Near you in Little Portugal
Around Little Portugal, our work takes us to homes and buildings near Allen Edwards Primary School, Larkhall Park and The Canton Arms and the streets around them. Nearby too are Durand Academy (within half a mile east) and Lambeth Palace Library (1.6 miles north). Little Portugal’s nearest station is Wandsworth Road station, about 0.7 miles south-west. Other landmarks nearby include Type Museum (under half a mile east) and The Gordon Hospital (1.4 miles north-west). Not far away are Knight's Hill and Battersea Park Lake.
Surface by surface
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
For landlords and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
If you manage several properties in or around Little Portugal, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Common questions in Little Portugal
Is Little Portugal in your area for external mastic?
Yes, Little Portugal is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Is parking a problem for a job in Little Portugal?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
I’m a tenant. Can you help?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
How do you reach high-level joints?
It depends on the building. Tell us the height, the number of joints and what’s below them and we’ll confirm how they can be reached safely.
Is the work guaranteed?
Yes, always. There’s a 12-month guarantee on every job, large or small.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.