Supporting Mitigation Activities and Resiliency Targets for Rebuilding Act or the SMART Rebuilding Act This bill amends the Robert T. Stafford Disaster Relief and Emergency Assistance Act to authorize the President to provide incentives to invest in measures that increase readiness for, and resilience from, a major disaster. The Federal Emergency Management Agency (FEMA) must issue comprehensive guidance on measures and investments that will be recognized for the purpose of increasing the federal share of disaster assistance. The bill authorizes the President to: (1) establish a National Public Infrastructure Predisaster Mitigation Fund which may be used for activities to implement design standards to protect the welfare of buildings' users against disasters, and (2) contribute to state and local governments for their associated expenses which shall include base and overtime wages for extra hires to facilitate the implementation and enforcement of adopted building codes for a period of not more than 180 days after the major disaster is declared. The President may contribute up to 75% of the cost of hazard mitigation measures determined to be cost-effective and which substantially reduce the risk of, or increase resilience to, future damage, hardship, loss, or suffering in any area affected by a major disaster.