Rent increase rules in Pennsylvania

There is no statewide limit — any amount, with proper notice.

No state statute; lease terms and common-law reasonable notice govern; some cities (e.g., Philadelphia) impose notice requirements by ordinance.

No — as everywhere in the US, a fixed-term lease locks the rent unless the lease itself contains an escalation clause. Increases take effect at renewal or on periodic (month-to-month) tenancies with the notice above.