Phase 1 environmental site assessment cost in 2026: U.S. planning ranges, a free calculator, and guides by state and property type—for buyers, lenders, and investors. A Phase 1 Environmental Site Assessment (ESA) typically costs between $1,800 ⚡ $2,500 for standard commercial properties. Depending on the property's size, region, and operational history, costs can flex down to $1,800 for basic sites or climb over $2,500 for highly complex properties. Phase 1 Environmental Site Assessment Cost California - Cost $1,800 to $2,500 - or Phase I Environmental Site Assessment - Phase I ESA - is the term used to describe the first phase or preliminary investigation phase of an ESA. 𝒜 ℒ ℱ 𝒜 phase 1 environmental consultants offers a wide range of phase 1 environmental assessment services providing our customers with the safest and most cost effective phase 1 environmental assessment solutions to all their phase 1 environmental assessment needs. How much does a phase 1 environmental assessment cost for your specific property? The sections below cover what drives the price, what California records show, who may do the work, who pays, when lenders require one, and what happens if the report finds a problem. Phase 1 Environmental Site Assessment ESA Cost $1,700 to $2,500 California - done in accordance with the American Society for Testing and Materials (ASTM) standard for Phase I ESA by EPA-Compliant Environmental Professional (EP) 40 CFR §312 who meets the requirements of the EPA - Cost of Phase 1 ESA $1,700 to $2,500 California - 7 to 10 days. How much does a Phase 1 environmental site assessment cost? For a standard commercial property, most Phase I prices and typical ranges that firms published in October 2026 fell between about $1,800 and $5,000, with a standard turnaround of 2 to 4 weeks. Phase 1 ESA cost in California Our Phase 1 ESA is $1,495 flat for a standard-scope property anywhere in California, delivered in 5 business days from authorization and confirmed site access. Phase I Environmental Site Assessment - ESA - Cost $ 1,700 - $ 2,500 - 7 to 10 days turnaround time. CLICK HERE to see ALFA 's phase 1 environmental most significant Environmental Assessment Reports, publicly available on reputable State or Federal websites such as Geotracker, EnviroStor, or EPA. A standard commercial Phase 1 Environmental Site Assessment in California typically plans around $3,450 – $5,550 (about 1 acre, mixed/unknown history, one building). Phase 1 environmental site assessment cost in California typically runs above the U.S. median.