Some things you want to check first are to check your local building codes to make sure your finished head room is in the basement does not fall below the required height for a livable space. Usually that finished height is 84″. The sole purpose for an egress is for an escape route in a livable space in the basement including a bedroom. Prices can range from $2000.00 to $5000.00 depending on the egress window itself. That includes excavation, egress window, egress well, back-fill and cap. The egress window may not add a whole lot to the value, but the finished basement could see a 25-35% return on your investment.