Greater London · England
External & façade joints in Broad Green, Greater London
External mastic for Broad Green and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
- Rigid filler in a joint that should flex
External mastic in Broad Green, done properly
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. We work on façade panels, copings & trims and render & cladding joints, and common reasons people get in touch are rain getting behind render or cladding at a joint and gaps where render, brick and frames meet.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. For a flat in Broad Green, check the lease for who looks after the outside.
There’s a 12-month guarantee on every job, large or small.
- Place
- Broad Green (CR0, CR7, CR90)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
When it isn’t the sealant
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Cracked brickwork or render that needs a builder or plasterer
- Structural movement, which needs a surveyor or engineer
- Render that is blown, hollow or coming away
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
What we seal
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Façade panels
- Concrete & block
- Joints between brick and frames
What external mastic looks like in Broad Green
Historic houses like Kingswood House (about 3.2 miles north) are a reminder that the area around Broad Green has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
Letting a property close to West Croydon station? Then outside joints that have cracked can let damp into a rental, so check them between lets. As a London address, Broad Green can be tricky for parking: let us know about parking bays, permits or a driveway.
Broad Green is about 6 miles south of Stockwell, in Greater London. Across the CR0 area, we cover external mastic for homes and businesses. Our Greater London coverage runs to 764 places, and Broad Green is one of them. Our London page covers work nearby, about 8 miles away.
Jobs for external mastic in CR0, CR7 and CR90 is quoted and booked the same way as anywhere else. External mastic is available to properties on York Road, Nova Road and Lion Road. Other places close to Broad Green include Old Town (1 mile south), Beddington (2 miles south-west), Waddon (2 miles south), Bandonhill (2 miles south-west) and Wallington (2 miles south-west). Within a short drive, we also cover London (8 miles north), City of Westminster (9 miles north), Marylebone (9 miles north), Kensington (9 miles north-west), St Pancras (10 miles north) and Shoreditch (10 miles north).
What’s near Broad Green
Locally, jobs take us to homes and businesses close to Harris Invictus Academy Croydon, The Half Moon pub and Waddon Ponds, among other places. Broad Green’s nearest station is West Croydon station, roughly 0.6 miles south of the centre. A little further out are Centrale Croydon (0.8 miles south) and Croydon University Hospital (less than half a mile north-west). For a walk, there’s Duppas Hill and Biggin Wood.
How the visit works
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First, the joints are inspected and the access agreed.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Clear the area around the work
- Keep pets and children clear of the area while we work
- Mention any sign-in or site rules at work premises
Get a quote
Want a quote for external mastic? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear price before any work starts.
Related advice
Aftercare tips
So the new joints stay in good condition:
- Avoid pressure-washing directly into sealant joints
- Make sure movement joints are not pointed over
- Leave the joints unpainted unless we have said otherwise
- Clear growth from the base of walls and joints
Keep pressure washers away from the sealant. High-pressure water can lift the edges.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
Broad Green: your questions answered
Is Broad Green in your area for external mastic?
Yes, Broad Green is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Can you help a landlord with a rental near West Croydon station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
Which products do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
What information do you need?
Tell us what needs doing and where, plus pictures if you have them. We will ask anything else we need to know.
Also near Broad Green
What else we do in Broad Green
When to call us in Broad Green
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
Look out for any of the following:
- Moss and dirt in joints with no sealant left
- Rain getting behind render or cladding at a joint
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
Schools such as Elmwood Infant School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before you book
- Is the old sealant removed completely?
- What product goes in the joint
- Who turns up on the day
- How long to leave it before use
What affects the cost of external mastic
You’ll get a clear quote before work begins. It’s based on:
- Which sealant suits the joint
- Working hours on commercial sites
- Whether the work is at height
- The size of the job
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The rough size of the job
- The problem you’ve noticed
- Photos by email, if that’s easy
- Any previous sealing or DIY work
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, ring 0345 464 0079 or email us.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Letting agents and landlords in Broad Green can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
What the job involves on each surface
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best.
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it, or one the system allows. Tell us what the building has when you get in touch.