GISEL'S services includes the following for residential homes and churches:
"Piano tuning is the act of making minute adjustments to the tensions of the strings of an acoustic piano to properly align the intervals between their tones so that the instrument is in tune. The meaning of the term 'in tune', in the context of piano tuning, is not simply a particular fixed set of pitches." (Wikipedia)
Depending on the piano's age, environmental settings, stability, or its last tuning, it may need more than one tuning. Tuning the notes sharp creates tension in the strings - winter season will need a pitch raise. During humid and summer seasons, it will need a pitch lowering.
A pitch raise/lowering requires more time and effort than a regular tuning, and as a result, the fee is a bit higher.
Recommended tuning maintenance is every 6 months after it has reached a tuning stability.