Alva 13 ft. 1 in. x 13 ft. 1 in. garden house D.I.Y. log cabin kit | Hud-1 EZ Buildings The Alva garden house log cabin kit is the perfect building for hobby work area, storage area, gardening room or that much needed extra space that adds style and beauty to any home. The Alva comes with vaulted ceilings giving over 8 ft. 1 in. of head space includes 171 sq. ft. of open space and includes French style double doors. The Alva comes with 1-1/8 in. interlocking spruce wall logs and a sturdy purlin roof system with 3/4 in. tongue and groove roof deck boards. The Alva is the perfect building for the DIY individual it is an easy weekend project to add more usable space. Roof covering material not included. Ready to mount on your provided foundation.