Interior demolition removes fixtures, finishes, and systems within a building. Selective deconstruction carefully removes materials for reuse or recycling. Structural elements are typically left in place. Asbestos and lead abatement must occur before demolition if present. Hazardous materials assessment is required before demolition. Utilities must be disconnected and made safe. Electrical circuits must be de-energized. Water and gas must be shut off. HVAC systems must be properly isolated. Mechanical demolition using hand tools and small equipment is typical. Heavy equipment may be used for larger removals. Work sequencing proceeds from top to bottom and inside to outside. Structural support must not be compromised. Falling hazard management includes protective barriers and nets. Waste management separates recyclable materials from waste. Cardboard, wood, metal, and other materials are typically recycled. Asbestos and hazardous waste requires special handling. Material reuse is prioritized when economically feasible. Historic building materials and features may be salvaged. Protection of adjacent areas prevents damage and disruption.