In Jainism, there isn’t a distinct “Vastu Shanti” mantra like you find in some Hindu traditions. For auspicious beginnings and inner peace, Jains typically rely on:

• Navkar Mantra (Namokar Mantra) — a central, highly revered prayer acknowledging the Arihants, Siddhas, and other worthy beings.
• Shanti-related verses or prayers (Shanti Stotras/Pratikraman practices) that foster inner peace and harmony in conduct and environment.

If you’d like, I can provide the exact Navkar Mantra text and a brief Jain_translation (arth) from authentic Jain sources, along with its traditional purpose and proper pronunciation.