Our Projects. G Investment Builders provides professional commercial construction, HVAC, refrigeration, and tenant improvement services throughout Southern California. Featured project types. Commercial tenant improvements, commercial HVAC installations, commercial refrigeration systems, electrical upgrades, self-storage facilities, warehouse improvements, restaurant construction, and retail renovations. We are currently adding project photos and case studies. Please contact us to discuss your project and request a free estimate. Phone six one nine, six four seven, eight eight five four. Email info at ginvestorbuild.com