Greater London · England
Woodcote Green External Mastic
Specialist external mastic for Woodcote Green: careful preparation, the right product and tidy work. Call for a quick quote.
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Some sealant jobs are within reach of a careful DIYer, 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.
How we handle external mastic in Woodcote Green
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on copings & trims, brickwork movement joints and façade panels, and people most often call us about movement joints with cracked, split or missing sealant and gaps where render, brick and frames meet.
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. For a flat in Woodcote Green, check the lease for who looks after the outside.
All of our work is guaranteed for twelve months.
- Place
- Woodcote Green (CR8, SM6, SM5)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Woodcote Green: your questions answered
Do you work for landlords with property near Reedham (London) station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Do you cover Woodcote Green for external mastic?
Yes. We work across London and the South East, and Woodcote Green is part of that. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages to suit the site.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
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. You’ll get a clear quote before any work starts.
How often do external joints need resealing?
It varies from wall to wall: 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 is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher work, tell us about the building and we will confirm what’s needed.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We work for landlords and letting agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
What we’re called out for in Woodcote Green
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Any of these means the joints need attention:
- Cracked joints where brick meets render or frames
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
- Panel joints letting water in
If you live in an older home near St. Patrick's Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Before booking anyone
- Whether the sealant suits the joint
- How hidden problems are handled
- What the quote includes, VAT included or not
- When the joint can take water or movement
Towns and villages near Woodcote Green
What else we do in Woodcote Green
What affects the quote in Woodcote Green
Some jobs are bigger than they look, and some smaller. The main factors:
- The number of rooms or windows
- Working hours on commercial sites
- Which sealant suits the joint
- The old material and how stubborn it is
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Asking for a quote
To make quoting easier, let us know:
- Any access issues, like height or stairs
- Whether it has been sealed before
- The problem you’ve noticed
- Roughly how big the job is
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or email us.
Outside joints around Woodcote Green
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
As a London address, Woodcote Green can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For landlords with property near Reedham (London) station, outside joints that have cracked can let damp into a rental, so check them between lets.
Woodcote Green is about 1 mile west of Purley, in Greater London. We carry out external mastic for householders, landlords and businesses in Woodcote Green and the surrounding area, as part of our work across Greater London. We cover 764 towns and villages across Greater London, large and small. There’s also a page for London, about 11 miles away.
Postcode districts we cover here for external mastic: CR8, SM6 and SM5. That includes homes and businesses on Farm Lane, Elton Road and Green Lane and the roads around them. Neighbouring places we cover for external mastic include Little Woodcote (1 mile west), Woodcote (1 mile south-east), Peaks Hill (1 mile east), Roundshaw (1 mile north-east) and Russell Hill (1 mile north-east). Within a short drive, we also cover London (11 miles north), City of Westminster (12 miles north), Marylebone (12 miles north), Kensington (11 miles north), St Pancras (13 miles north) and Shoreditch (13 miles north).
Local landmarks in Woodcote Green
Locally, jobs take us to homes and businesses close to Laleham Lea School, Carshalton Park and Woodcote Primary School, among other places. For rail, the closest station is Reedham (London) station, roughly 1.3 miles south-east of the centre. Nearby you will also find St George's Walk (3.2 miles north-east) and Croydon Airport Visitor Centre (1.8 miles north-east). Open spaces near Woodcote Green include Roundshaw Downs and Duppas Hill.
How it works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work 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 Woodcote Green. 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.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
- Clear items away from the joints we’re working on
Ask for a quote
To get a quote, call 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 work begins.
Related advice
Different surfaces, different methods
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
How to look after the new joints
To keep the joints looking good and working properly:
- Check external joints each spring
- Avoid pressure-washing directly into sealant joints
- Show decorators and builders where the movement joints are
- Make sure movement joints are not pointed over
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants aren’t designed to be painted, and paint can crack as the joint moves.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.