Landlord-tenant relationships are primarily governed by the Texas Property Code — TRELA and TREC's standards govern real estate license holders' conduct, not the substantive landlord-tenant relationship itself, and the Business and Commerce Code covers different subject matter entirely.

Texas law generally requires the deposit (or an itemized list of deductions) back within 30 days of the tenant surrendering the property — there's no 60- or 90-day standard, and it isn't left open-ended or conditioned on the tenant remembering to request it.

Texas law creates a narrow statutory exception: a landlord may change the locks on a rent-delinquent tenant without a completed eviction, but only if the lease affirmatively authorizes it and the landlord follows strict notice and rekey requirements — including providing a way for the tenant to get a new key at any hour. It isn't an absolute ban, isn't notice-free, and simply filing for eviction doesn't itself authorize a lockout.

A landlord generally has a duty to address a properly-noticed repair within a reasonable time — that duty isn't simply waived by a rent dispute, doesn't require the tenant to front material costs, and isn't limited only to repairs explicitly itemized in the lease.