Sharing room with 1 year old and newbon

So I have one bedroom (we are renting my grandparents garage, there are literally CNC machines in the living room, we cannot afford to move) anyway one bedroom that me and my husband currently share with our 9 month old daughter, the problem is I am pregnant due in December meaning I will have a 12 mo old and a newborn and I’m really concerned about us all sleeping in the same room bc of the newborn waking up every few hours (my daughter has been sleeping through the night since 4 mo) I’m worried new baby will wake her up all night and make her very grumpy... I don’t want two grumpy babies while sleep deprived.. I just don’t know what my options are as it’s not safe in the “living room” for anyone to sleep? Has anyone had this work out? Is something else even possible? Please I’d really like advice I’ve been stressing About this since conceiving my little man.