I would have smoke billow out of the house, and project the flames onto the smoke, fantasmagoria style.
id also have the house made in two sections, the back half of the house, being a charred duplicate of the front, so that at some point, it's turned around.
maybe have a turn table on the table to achieve this.
or, failing this have a burnt house made, over which you sit a perfectly lovely house shell.
have the shell atatched to a wire in the flies. in a semi black out, with a tightly focused light, you fly out the shell, leaving the burned house behind.
have the house constructed out of shim.
on the outside it looks nice and white, but on the inside surface, you paint the charred version of the house.
in the table, you have orange gelled birdys.
bring up the birdies, and down the stage lights, and the house melts from good, to burned.