Welcome to the site Small loft should be 8 x 6 about £800 10 x 6 about £1K but both can cost a lot more. Hope this helps,but if you have space,you'd be better getting something bigger with minimum 3 sections. One section stock,second section widowhood cocks third section widow hens smaller section. Or could fly natural race birds and have one section then for youngsters. What I'd recommend you do is getting some ybs to start off with. Remember QUALITY over quantity Small team less problems to go wrong. You will enjoy it more as well.