Jain Dharma does not include a "Vastu Devta mantra." In Jainism, devotional focus is on the Tirthankaras, the Navkar Mantra (Namokar Mantra), and ethical/studious practice rather than vastu or directional deities.

If you’d like, I can share authentic Jain mantras and their meanings (e.g., Navkar Mantra, or prayers to specific Tirthankaras) in a simple, accurate way.