Significantly less than most homeowners expect, but the answer is not zero. As of April 2026, Kingdom & Co. recommends three core maintenance categories for newly built or fully renovated custom homes: re-seal natural stone countertops (quartzite, marble) on the manufacturer’s recommended cycle, lubricate slider door tracks and clean debris from them, and keep water away from wood — wood floors and wood cabinets are not waterproof, and continuous water exposure causes irreversible damage. Beyond that, fix small functional issues quickly before they escalate.