Enclosed outdoor structures — prefabricated garden pods, modular poolside cabins and glamping studio units that add covered seating or a guest room without a building permit-scale rebuild.
By floor area — pods and cabins on this shelf are quoted per square foot or per square meter of the footprint you specify, so a larger shell costs proportionally more.
That turns on size, siting and whether the unit is fixed to a foundation, and rules differ by country — we supply the structure, not the consent, so check locally before ordering.
A pod, if you need the space year-round — it encloses the area so it stays usable in wind and rain and can be heated, while a pergola only gives shade and airflow over existing seating.