Small, medium and larger first libraries
A smaller first library can limit capital and premises exposure while giving the owner room to learn. A medium model can balance capacity and commitment when demand evidence is stronger. A larger first site may be justified where local demand, premises, capital, service design and expansion readiness are unusually well supported. These are planning bands, not market averages.
Physical capacity versus sensible capacity
Gross premises area includes reception, passages, washrooms, storage, service spaces and other non-seat areas. Practical capacity also reflects comfort, movement, power, cooling, lighting, safety, privacy and the quality members expect. Exact space-per-seat requirements should be verified for the actual premises and jurisdiction rather than invented as a universal rule.
Demand and fixed-cost economics
Empty seats still occupy paid premises and represent committed capital. A larger site may spread some fixed costs across more potential memberships, but only if those memberships can be sold and served at an effective realized price. Evaluate capacity with rent, costs, utilization, contribution and downside scenarios together.
Shifts change membership capacity
One physical seat may support different members in non-overlapping shifts. That can increase sellable membership capacity without adding physical seats, but the model must account for schedule demand, access rules, attendance patterns, staff, cleaning, conflicts and the risk that every member wants the same time window.
Expansion versus overbuilding
Leave room to learn when the premises and terms make that possible, but do not pay for speculative capacity without evidence. A first location should have a credible path for adding seats, shifts or a second branch—or a manageable way to exit if demand does not materialize.