Guests under 18 years of age must be accompanied by a parent or guardian. Eight Roof Top Bar is open Wednesday - Saturday from 17:00 to 00:00. Entrance fee to the spa from 16 years of age NOK 250 Grand Hotel Oslo opens Grand Spa December 1st 2026. Grand Spa will cover approximately 450 square yards. The facility will include a pool area, treatment rooms, lounge spaces and outdoor terraces. Beth's Beauty will operate and develop Grand Spa. The excisting spa will close for renovation July 27th.