Inside Floor Area:172 Sqf (whereof 86 Sqf is covered) Wall thickness: 13/16″ (21 mm) – T&G pattern Ideal back yard recreation lounge, guest house or even a home office Estimated assembly time 8 hours for two adults. Can be assembled as mirror image Solvalla actually consists two separate 86 sqf. structures connected together. In most locales where 100 sqf is the permit exempt limit, you will not need a permit. We recommend to verify this with your local building authority prior to order..