When designing your BBQ area, always follow the cooking appliance manufacturer instructions. Where the manufacturer does not specify barbecue clearances, clearance distances shall be as described in AS/NZS 5601:1 2013. Always seek advice from a licensed gasfitter and follow the guidelines as set out in AS/NZS 5601.1:2013.
There are many BBQ brands that offer a heat jacket option for installation around combustible materials. Brands include Tucker Barbecues, Heatlie Barbecues, Grandfire, DCS by Fisher & Paykel, Sub-Zero Wolf and Lynx.