Costello 24 ft x 24 ft Log Cabin D.I.Y. Building Kit | Hud-1 EZ Buildings The Costello Log cabin kit is a multi room design with a lofted bunk area. The Costello has 24 ft. x 24 ft. interior space and a 24 ft. x 6 ft porch area which gives this building 720 sq. ft. of space. Offers a 24 ft x 13 ft open space, a 20 ft x 11 ft master bedroom suite with walk in closet and bathroom, offers a 4 ft. x 7 ft 5 in bonus/laundry area. The Costello offers a perlin roof system design that gives it the open vaulted cathedral style look. The building is shipped direct to you via curbside. Roofing shingles are sold separately.