Greater London · England
External Mastic in South Croydon
Movement joints in South Croydon need attention? We cut out the old, prepare the joints and apply the right sealant.
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
- Cracked joints where brick meets render or frames
Why deal with it now?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last, so it pays to do it properly once. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in South Croydon, the repair is bigger than the sealant job would have been.
The cost depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Why South Croydon clients choose us
- Over 20 years’ experience
- Anti-fungal sanitary silicone in wet areas
- Experience in homes, commercial sites and hotels
- White, clear, grey or coloured to suit, where the product allows
Take a look at how sealant jobs are priced and customer reviews.
External mastic in South Croydon
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. We work on brickwork movement joints, joints between brick and frames and render & cladding joints, and the jobs we see most are sealant that has lost its bond to the brick or render and weathered mastic that no longer stretches.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in South Croydon, tell us how high the joints are and how to reach the back of the building.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Place
- South Croydon (CR2, CR8, CR0)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
On the day, we start by going over the job with you. We protect the surfaces around the joints before we start. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In South Croydon, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- 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.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- For business premises, tell us about site rules or sign-in
- Move anything stored near the joints
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Advice
What affects the quote in South Croydon
We quote each job individually. These are the things that affect it:
- When we can work, for business premises
- Mould in or behind the old joints
- The size of the job
- Whether the work is at height
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
You don’t need to know the technical terms. It helps if you can tell us:
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
- Roughly how big the job is
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.
What the job involves on each surface
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible year round.
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Walls and rooflines in South Croydon
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
Letting a property close to Sanderstead station? Then split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Purley Oaks Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
South Croydon is about 1 mile south of Croydon, in Greater London. Jobs in South Croydon get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. South Croydon is one of 764 places in Greater London where we work. London is on our list too, about 10 miles from South Croydon.
Postcode districts we cover here for external mastic: CR2, CR8 and CR0. Whether your property is on Edgar Road, Bynes Road and Grange Road or a nearby road, our applicators can take on the job. Other places close to South Croydon include Croydon (1 mile north), Coombe (1 mile north-east), Sanderstead (1 mile south-east), Riddlesdown (2 miles south) and Selsdon (2 miles east). Larger places within reach include London (10 miles north), City of Westminster (11 miles north), Marylebone (12 miles north), Kensington (11 miles north-west), St Pancras (12 miles north) and Shoreditch (12 miles north).
Around South Croydon
In South Croydon, that means homes and buildings near The Purley Arms, Harris Academy Purley and Duppas Hill and the streets around them. There’s a railway station in South Croydon itself: Sanderstead station. Well-known places in the area include Purley War Memorial Hospital (1.2 miles south-west) and Croydon Airport Visitor Centre (1 mile west). The countryside around South Croydon includes Roundshaw Downs and Duppas Hill.
Landlords, agents and businesses in South Croydon
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured.
Towns and villages near South Croydon
More services for South Croydon
When to call us in South Croydon
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
These are the problems we are asked about most:
- Weeds or debris growing in open joints
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Cracked joints where brick meets render or frames
South Croydon is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Before booking anyone
- Whether they seal over old material or remove it
- What guarantee comes with the work
- Which colour the sealant will be
- Whether the sealant suits the joint
Questions from South Croydon
Is parking an issue for external mastic in South Croydon?
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.
Is South Croydon in your area for external mastic?
Yes. Our work covers London and the South East, and South Croydon is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Can landlords and businesses book you?
Yes, regularly. Several properties can go on one quote.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we are done.
When will the joints need doing again?
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 one-year guarantee.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
How long does the job take?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer, and we will say how long yours will take.
Aftercare tips
After the cure time, these simple habits help:
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
- Fix overflowing gutters above sealed joints
- Get split or bare joints resealed while the damage is small
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
Once a joint cannot move, the wall finds another way, generally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.