NH HB410

Prohibits local governments from adopting "extraordinary restrictions" on residential property unless narrowly tailored to serve a compelling public health or safety interest

Defines extraordinary restrictions to include: minimum dwelling sizes over 200 sq ft, lot sizes over 5 acres (or 0.5 acres with municipal water/sewer), road frontage over 200 feet (or 50 feet with water/sewer), bans on residential use in commercial zones, and restrictions on in-home businesses or construction methods

Requires empirical evidence such as written findings, scientific studies, or quantitative data to support any extraordinary restriction, though such evidence is not automatically dispositive

Makes existing extraordinary restrictions unenforceable unless they meet the new compelling interest standard

Takes effect 180 days after passage, with fiscal estimates projecting indeterminable local revenue decreases and potential municipal expenditure increases of $10,000 to $100,000 for legal disputes and ordinance reviews