@gee1.. I am very sorry for this great disappointment. I just want you to be strong and have hope for something better than this. Also, sometimes when bad things befall us it is sometimes the plan of God just to protect us from something very calamitous greater than the incident. Ask your self this question, what if after the completion of the house and things don't seems to be going smoothly when you are living in there?
I believe there is a greater blessing coming. We just have to endure the pain, believe and hope in God and we keep striving for success till it comes to us.

I sympathise with you drastically. I am very sorry for this great loss.