Which pūjā is done when opening a new shop, office or business?

usually a Gaṇeśa–Lakṣmī pūjā on an auspicious muhūrta, often with a Satyanārāyaṇa kathā or a small havan.

The most common opening ritual across India is a joint Gaṇeśa and Lakṣmī pūjā: Gaṇeśa for a smooth start and Lakṣmī for prosperity. The owner sits with the family, a kalaśa is set up, the deities are worshipped, and “Śubh-Lābh” and a svastika are drawn at the entrance or on the cash box. Many add a Satyanārāyaṇa kathā or a short Vāstu-śānti havan, and in some regions a toraṇa of mango leaves is tied over the door.

A good day and time are chosen with a muhūrta, avoiding Rāhu-kāla for the actual opening. Traders in many communities also begin fresh account books on Dīpāvalī or Akṣaya Tṛtīyā.

Afterwards, prasāda is shared with staff, neighbours and the first customers. The spirit is to start by giving, not only by receiving.

Source: common practice across Indian trading communities

Dharma Q&A — Jyotiṣa, scriptures & modern life · Ask a Jyotishi your own question