Greater London · England
External & façade joints in Sands End, Greater London
We cover Sands End for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Movement joints filled with mortar instead of sealant
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
Aftercare tips
To keep the joints looking good and working properly:
- Fix overflowing gutters above sealed joints
- Make sure movement joints are not pointed over
- Avoid pressure-washing directly into sealant joints
- Point out the joints to other trades
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead over time.
Act while the splits are small. At that stage it’s a simple cut out and reseal before water has had years to get in.
External mastic in Sands End, done properly
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. We are often asked to deal with movement joints with cracked, split or missing sealant and failed seals between different materials, across façade panels, brickwork movement joints and render & cladding joints.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Every job is covered by a 12-month guarantee.
- Where
- Sands End (SW11, SW6, SW10)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Do you need external mastic in Sands End?
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Look out for any of the following:
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
- Joints where the bead has come unstuck
- Old sealant gone brittle and cracked
For site and facilities teams at buildings such as Falconbrook Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- Is VAT in the price?
- What guarantee comes with the work
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
How we quote for external mastic
Your quote is based on your job. We take into account:
- Any working-time requirements on site
- Access and height
- Mould in or behind the old joints
- The size of the job
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear quote.
What we do, step by step
There is not much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours for a handful of joints, longer for a whole elevation, including the tidy-up. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Sands End. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
- Tell us about any water getting in
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Advice
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Walls and rooflines in Sands End
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Historic houses like Carlyle's House (about 0.9 miles north-east) are a reminder that the area around Sands End has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
As a London address, Sands End can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near Imperial Wharf station, outside joints that have cracked can let damp into a rental, so check them between lets.
Sands End is about 2 miles south-west of Brompton, in Greater London. Every kind of property in Sands End can book us for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Sands End is one of 764 places in Greater London where we work.
We work across the SW11, SW6 and SW10 postcode area for external mastic and the streets around it. If you need external mastic at a property on York Road, Lots Road and Hyde Lane or a nearby road, we can help. We also cover the places around Sands End: Chelsea Harbour (1 mile north), Walham Green (1 mile north-west), World's End (1 mile north), Clapham Junction (1 mile south-east) and Little Chelsea (1 mile north). Within a short drive, we also cover London (4 miles north-east), City of Westminster (3 miles north), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (10 miles north-east).
Around Sands End
In Sands End, that means homes and buildings near Raven Inn, Chelsea Academy and Heatherley School of Fine Art. Also close by are Natural History Museum Library and Archives (1.7 miles north) and Imperial Park (under half a mile south-west). There’s a railway station in Sands End itself: Imperial Wharf station. Nearby you will also find Battersea General Hospital (0.7 miles east) and Southside Wandsworth (1.4 miles south-west). Not far away are Campden Hill and WWT London Wetland Centre.
Places near Sands End
What else we do in Sands End
Your questions about external mastic in Sands End
Do you cover Sands End for external mastic?
Yes, Sands End is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Do you work for landlords with property near Imperial Wharf station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Do you have insurance?
Yes. We’re fully insured for domestic and commercial work.
Where is Mr Mastic based?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back so the bead can stretch.
How the job changes by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
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 if the joint can be cleared.
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. In London conversions, one flat’s bathroom is often above another flat’s ceiling, 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 for homes in Sands End.
Combining jobs into one visit normally makes better use of the time than several visits. You will get one clear quote for the whole job.
What you get with us
- Over 20 years’ experience
- Any old sealant cut out fully, not covered over
- An ARBOMaster approved applicator
- Rated 4.9 stars on Google
Take a look at what affects the cost and what customers say.