How much does a Phase I environmental site assessment cost?
For a small commercial property, a Phase I environmental site assessment usually costs about $1,500 to $5,000, and fixed-price offers start near $1,500. Large, old or industrial sites cost more. Most take two to three weeks. If you're still deciding whether to make an offer, a desk screen for a fraction of that tells you whether the Phase I is worth ordering and where the consultant should look.
What moves the price
Size and age of the site, how many buildings the consultant must walk, and how much history there is to trace. A gas station, dry cleaner, auto shop or old factory on or next to the site means more records to pull and more to explain.
Rush fees for a report needed in days, travel to remote sites, and lender requirements (some lenders want a specific scope or their own reliance letter).
What you get for it
A report by an environmental professional under ASTM E1527-21 and EPA's All Appropriate Inquiries rule. It reviews government records, historical sources, a site visit and interviews, and lists recognized environmental conditions. Done right, it supports the buyer's defenses to Superfund liability.
It does not sample soil or groundwater. If the Phase I finds a problem, a Phase II does that, and it costs more.
When a screen comes first
Buyers who look at many deals and close a few don't want to spend thousands on a site they may walk from. A pre-Phase I screen reads the same public records and decades of aerial photos, tells you whether a Phase I looks routine or likely to find something, and gives you the flood picture a Phase I leaves out.
A screen is no substitute for a Phase I when you buy or borrow. It tells you whether to order one now.
Check a property’s flood zone free
Type the address. See the FEMA flood zone and map, free. Add your email to see which buildings sit in the flood area.
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Sources (checked 2026-11-10)