Tree Protection Zones (TPZ) by Permcon

Leaders in permeable concrete

Permcon is a permeable concrete system designed for New Zealand conditions. It combines strength and durability with proven stormwater performance – helping reduce runoff, filter out pollutants, and protect our streams and rivers.

Where conventional concrete channels rainwater into drains, Permcon captures it at the surface. Water filters through the concrete into an engineered base layer, where it’s temporarily stored and slowly released – reducing pressure on stormwater systems and supporting groundwater recharge.

Gain usable space without breaching site coverage rules

Permcon is treated as a permeable surface under most New Zealand planning frameworks. That means you can maximise your site’s usable area – for driveways, footpaths, car parks and more – without exceeding impervious surface limits. It’s a simple, compliant way to meet stormwater and land use requirements without compromising on performance or finish.

Whether you’re designing for a home, commercial site, or community space, Permcon delivers:

• Reliable infiltration even in heavy rainfall
• Durable performance for light-to-medium traffic areas
• Environmental compliance without the complexity
• Proven results across residential, commercial and council-led projects

Backed by experience. Built to last.

Permcon is supplied and installed by Firth Concrete in partnership with Permcon NZ – ensuring technical expertise, consistent delivery, and support from design through to installation.