Housing intensification has transformed how New Zealand communities are built, but it has also introduced a range of challenges that earlier residential design never had to contend with. One of the most critical is fire evacuation planning. Where older homes sat on generous sections with clear paths to open land, today’s developments often involve shared driveways, boundary walls, and layouts that require occupants to navigate around or between other buildings before reaching safety.
The consequences of overlooking this at the design stage are significant, ranging from consent delays and costly redesigns to genuine life safety risk. Getting it right from the outset requires treating escape routes as a fundamental design element, not a compliance checkbox ticked late in the process.
What the C/AS1 Guidance Requires
The revised C/AS1 acceptable solution sets out clear obligations for external escape routes. Where a building has only a single direction of travel from an exit door and no sprinkler system is installed, a compliant external escape route must be provided. This typically means maintaining at least one metre of separation from adjacent fire cells or incorporating fire-rated construction along the route.
These requirements reflect a broader shift in how fire safety is being integrated into the planning of denser residential environments. The guidance recognises that in a terrace or multi-unit development, the path from front door to street is no longer guaranteed to be unobstructed.
Site Planning as a Life Safety Issue
Building placement, boundary clearances, and the location of shared access routes all have a direct bearing on whether occupants can safely exit during an emergency. BRANZ research reinforces this, highlighting the importance of designs that support horizontal movement and clear circulation paths, particularly for residents with reduced mobility or who may be evacuating without full situational awareness.
Fire protection systems such as sprinklers and modern alarm systems with voice and visual alerts have improved significantly, giving occupants more time to evacuate. But that additional time is only useful if the path to safety is clear and well-designed.
The Cost of Getting It Wrong
Projects that treat escape routes as secondary considerations often encounter problems at the consent or inspection stage. Alterations required to bring a development into compliance can be expensive to address once construction has progressed, and in some cases may require redesigning elements that have already been built.
The more reliable approach is to integrate escape route planning into the earliest stages of site layout and building design. Consulting with a fire engineer at concept stage, rather than at consent, gives designers the flexibility to resolve constraints before they become costly problems.
Designing for Evacuation from the Start
For builders and designers working on intensification projects, the key shift is viewing escape routes as part of the overall design brief rather than a regulatory hurdle. That means reviewing site plans with evacuation in mind, understanding which building placements create single-direction escape paths, and knowing when fire-rated construction or separation distances are required to satisfy C/AS1.
With New Zealand’s housing density set to continue increasing, this kind of thinking will become a standard part of residential design practice.
Explore more guidance on construction compliance and health and safety requirements, or connect with professionals working across New Zealand’s residential building sector.
