A well-prepared home will protect you from a bushfire's radiant heat in most circumstances.

However, Tasmania Fire Service recommends that you should not plan to defend your home when the fire danger rating exceeds 50 (severe) unless you have created a defendable space and ember-proofed your home. Unless your home has a defendable space and has been designed and built specifically to withstand a bushfire, you should not plan to defend it if the fire danger rating exceeds 75 (extreme).

You should not plan to defend your home on days when the fire danger rating exceeds 100 (catastrophic), unless firefighters have assessed it on the day that a fire is threatening and have advised you that it is defendable. This recognises that even on days with catastrophic fire danger ratings, some homes, because of their circumstances, are defendable. For example, a farmhouse surrounded by several hectares of planted vegetables, ploughed fields or heavily-grazed paddocks is likely to be defendable, particularly if it has been well-constructed and ember-proofed.
Do not attempt to flee in your car at the last minute.

If you are defending your home against a bushfire and it catches fire and you can't put it out, you will need to leave before toxic fumes overcome you. If it's unsafe to leave immediately, close all interior doors and shelter inside at an exit as far from the fire as possible. Leave once it is safe outside, and before it becomes unsafe inside.

Relocate to a nearby safer place. If necessary, shelter from radiant heat. This might be in your vegetable garden, the park across the street or your next-door neighbour's house. You should identify this 'safe haven' in your bushfire survival plan. Choose a place that is very close, will be safe to get to, and will be safe when you get there.