Greater London · England
External & façade joints in Southborough, Greater London
External mastic for Southborough and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Weathered mastic that no longer stretches
- Sealant pulling away from one side of the joint
- Joints with sealant missing in places
External mastic for homes and businesses in Southborough
Low-level joints can normally be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. Typical jobs include rigid filler in a joint that should flex and failed seals between different materials, across joints between brick and frames, façade panels and render & cladding joints.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Southborough (BR2, BR1)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
To keep the joints looking good and working properly:
- Check the sealant is paintable before painting near it
- Keep soil, plants and ivy away from the joints
- Have failed joints looked at early
- Make sure movement joints are not pointed over
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.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
Places near Southborough
What else we do in Southborough
How we quote for external mastic
The price is agreed before any work begins. It’s based on:
- The size of the job
- The type of sealant required
- The number of rooms or windows
- Any working-time requirements on site
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- Roughly how big the job is
- Whether it’s a home or a business
- Photos by email, if that’s easy
- Access, such as stairs, a lift or height
We don’t publish a price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or drop us an email.
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Southborough, the repair is bigger than a sealant job.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
Why Southborough clients choose us
- Full insurance on every job
- Sealant colour chosen to suit
- White, clear, grey or coloured to suit, where the product allows
- Homes, businesses and hotels
Read how sealant jobs are priced and our reviews.
Your questions about external mastic in Southborough
Can you help a landlord with a rental near Bickley station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Is Southborough in your area for external mastic?
Yes, Southborough is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
What does external mastic cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
How often do external joints need resealing?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Our work comes with a one-year guarantee.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll tell you what we’re using.
What happens on the day
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. In Southborough, as in most of London, parking needs a little planning. 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 will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
How to get a quote
If you are in Southborough and need external mastic, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
Advice
Southborough buildings and the weather
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. 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.
As a London address, Southborough can be tricky for parking: let us know about parking bays, permits or a driveway. If you let a flat or house near Bickley station, outside joints that have cracked can let damp into a rental, so check them between lets.
Southborough is about 2 miles south-east of Bromley, in Greater London. We carry out external mastic for homeowners, landlords and businesses in Southborough, as part of our work across Greater London. Our area takes in 764 places across Greater London, large and small. We also work in London, around 10 miles away.
Jobs for external mastic in BR2 and BR1 is quoted and booked the same way as anywhere else. You’ll find streets such as Pope Road, Crown Lane and Union Road, and we cover them all. Nearby, we also carry out external mastic in Bromley Common (1 mile south-west), Petts Wood (1 mile east), Locksbottom (2 miles south-east), Shortlands (2 miles west) and Crofton (2 miles south-east). We also work in nearby towns such as London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (13 miles north-west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).
Near you in Southborough
We work in homes and buildings around Bishop Justus CofE School, Jubilee Country Park and The Chequers Public House, among other places. The nearest railway station is Bickley station, about 0.7 miles north. Nearby you will also find Bethlem Museum of the Mind (0.9 miles south-west) and Bridgeways Day Hospital (under half a mile south). For a walk, there’s Summer Hill and Downham Woodland Walk.
How the job changes by surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Send us any details you have about the façade.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
What we are called out for in Southborough
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
The problems people normally mention when they call include:
- Movement joints with cracked, split or missing sealant
- Rigid filler in a joint that should flex
- Failed sealant between panels on a façade
- Cracked joints where brick meets render or frames
For site and facilities teams at buildings such as Southborough Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Comparing quotes
- What happens if they find a problem under the old sealant
- What the cure time is
- How much experience the applicator has
- Whether they seal over old material or remove it
Honest limits
Sealant is not the answer to every problem, and we’d rather say so up front. It will not solve:
- Subsidence or other structural problems
- Damp that isn’t coming from the joint
- Adding movement joints to masonry that has none
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Façade panels