Hello!
In fact, the hyphen hurts the value. Also Semrush reports no US monthly searches for these two terms combined. It reports however 590 US monthly searches for the terms "credit building loans" with a CPC of $6,72. Another interesting fact is that buildingloans.com.au sold, this year for $1,086 (extension is not prime, but no hyphen here). For your name, I would say mid to high $xx. With some luck, maybe very low $xxx.
Best of luck!