Los Angeles operates under the Los Angeles Municipal Code (LAMC) which adopts the 2022 California Building Code with local amendments. The Los Angeles Department of Building and Safety (LADBS) manages all permitting. Typical permit timelines range from 4-12 weeks depending on project complexity. LA is in Seismic Zone D, requiring enhanced seismic design. Notable requirements include soft-story retrofit mandates, cool roof standards, and strict fire-separation requirements. The city has a population of approximately 3.9 million and covers 502 square miles. Permits for residential projects typically cost 0.6-0.7% of construction value. Commercial projects require additional plan review, especially for high-occupancy buildings. The city offers expedited permitting for sustainable projects. Recent amendments focus on earthquake resilience and energy efficiency.