No, owner-builder costs don’t always equal market value. While an owner might report actual costs based on their own labor and expenses, appraisers use a broader approach to estimate market value. This includes full economic costs, which factor in direct costs (labor, materials, etc.), indirect costs (administrative fees, insurance, etc.), and entrepreneurial profit (the return expected by a developer). Even if an owner provides their own labor, its value must be considered. The Assessor uses standard cost manuals to compare reported costs with typical market costs, and when significant discrepancies arise, a different value may be enrolled.
Remodeling is not generally assessable unless new square footage is added. Remodeling may be considered “repair and maintenance" and primarily cosmetic. This can include new flooring, countertops, cabinets or windows, in which case no reassessment is justified. While re-modeling work usually improves a building's appearance, it does not change the effective age of the building.