Earth sheltering would likely be the only partial solution. But that usually requires more land in order to have 6' thick surrounding berms and cover.

Even then there would have to be some considerations as the the fire resistance of any exterior features. It might need to be more "bomb shelter" like around the entrances and window features, moveable shields? make them out of Air-Crete of some other weight modified concrete, maybe build a mildly inclined ramp so a wheeled barrier could be rolled into place quickly to cover things like doors and windows. Maybe a heat sensitive meltable link to hold them in place until the ambient air temps exceed normal. Links would melt and the large thick Air-Crete blast cover would roll into position covering the flammable exterior parts.

How about cover endangered structures with some type of aqueous foam as the fire threatens them. The fire trucks at airports for example easily generate a mountain of foam that can cover a plane so they should easily cover a house. How about something along the lines of those hydro seeding trucks, they can shoot stuff a couple hundred feet.