Sorry to see that happen. Money lost is one thing, but there is a pretty big emotional investment in something like that too......the house and the birds. Tough thing to accept.
How did you have the heat lamp installed? How close to combustibles, etc? How was it wired?
Also, did you also happen to have an electric water heater? If so, what type and how was it installed?
(I see these metal pans with light bulbs in them........some of them homemade.....and they are placed beneath water buckets and water tanks and I start to see spilt water and electricity coming together. Shock hazard for certain, but possible fire hazard as well).