Vastu shastra, Vedic astrology and numerology are three dedicated ancient sciences but have a deep intrinsic relationship with each other. Every direction in vastu is governed by a particular planet which is ruled by its underlying number and color combination.
Simply using numerology or vastu shastra in isolation can be beneficial but can be even more prudent when applied together. Since vastu shastra places emphasis on direction and numerology gives the underlying ruling number, vastu and numerology can be effectively used together.