Greater London · England
External & façade joints in South Street, Greater London
We cover South Street for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly.
- Moss and dirt in joints with no sealant left
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
What happens if it’s left?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. 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. Putting it right early is much less trouble for homes in South Street.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in South Street
- A 12-month guarantee on all work
- Tidy, careful work
- Over 20 years’ experience
- Colour agreed with you before any work starts
Read how sealant jobs are priced or our reviews.
How we handle external mastic in South Street
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall. We work on render & cladding joints, brickwork movement joints and concrete & block, and common reasons people get in touch are movement joints with cracked, split or missing sealant and old sealant gone brittle and cracked.
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. In a converted house in South Street, it’s worth checking who is responsible for the outside before booking.
Our work is backed for twelve months, in South Street and everywhere else we cover.
- Location
- South Street (TN16)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of external mastic
Call for a quick quote. The main things that affect it are:
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- The size of the job
- Any mould that needs treating
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Photos by email, if that is easy
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
Need a quote? Please ring 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
How it works
There is not much for you to do on the day. Show us the job and we will take it from there. The work itself takes 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 South Street. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- 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.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
- Tell us if parking is tricky
Get a quote
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.
Read more
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Places near South Street
Also in South Street
FAQs for South Street
Can parking be tricky for a visit in South Street?
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.
Can you do external mastic in South Street?
Yes, South Street is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it doesn’t stand out.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Do you use backing rod?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding so the bead can stretch.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses and we’re fully insured.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Honest limits
Before you book, it’s worth knowing the limits too:
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
- Cutting new joints into brickwork, which is building work rather than sealant work
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Where we work in South Street
- Façade panels
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
Landlords, agents and businesses in South Street
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
Signs you need external mastic in South Street
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Keep an eye out for any of the following:
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
As a London address, South Street can be tricky for parking: let us know about parking bays, permits or a driveway.
Questions to ask before booking
- What preparation is included
- What the quote includes, VAT included or not
- Are they insured?
- Whether you can choose the colour
Walls and rooflines in South Street
Historic houses like Titsey Place (about 2.1 miles south-west) are a reminder that the area around South Street 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. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Oxted station, split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as Church of St Mary the Virgin, older walls, gutters and the joints where extensions meet them need a flexible sealant.
South Street is about 4 miles north-east of Oxted, in Greater London. Homes, rented property, offices and hotels in South Street is covered for external mastic. Every job comes with our 12-month guarantee. We cover 764 towns and villages across Greater London. London is on our list too, around 15 miles away.
All of TN16 is within our area for external mastic. Other places close to South Street include Tatsfield (1 mile west), Force Green (2 miles south-east), Titsey (2 miles south-west), Westerham (2 miles south-east) and Moorhouse Bank (3 miles south). We also work in nearby towns such as London (15 miles north-west), Stockwell (14 miles north-west), Orpington (6 miles north), Wimbledon (14 miles north-west), Kennington (15 miles north-west) and New Cross (13 miles north).
Around South Street
The closest station to South Street is Oxted station, about 3.7 miles south-west. Nearby you’ll also find Tandridge Priory (3.2 miles south). For a walk, there’s West Kent Golf Course nature reserve and Betsom's Hill.