Environmental Phase I II Cost Calculator

Phase I/II add DD cost. This calculator sizes.

Phase I cost

Phase II trigger probability %

Phase II cost

Remediation probability %

Remediation cost

Expected total DD cost

$16,600

Expected Phase II

$3,600

Expected remediation

$7,500

How the math works

Expected DD = Phase I + (Phase II prob × Phase II cost) + (Phase II prob × remediation prob × remediation cost).

On $5,500 Phase I with 20% Phase II trigger ($18k) and 30% remediation conditional ($125k): $5,500 + $3,600 + $7,500 = ~$17k expected. Budget $20-30k for acquisitions in industrial/historical areas; $7-10k for clean office/multifamily.

How to Use

Enter Phase I cost.
Enter probability triggering Phase II %.
Enter Phase II cost.
Enter probability triggering remediation %.
Enter remediation cost.
Read expected total DD cost.

Frequently Asked Questions

Phase I?

Standard Phase I ESA: $2,500-$8,000 depending on complexity and location. Covers records review, site inspection, interviews. 30-45 day turnaround. Required for most commercial acquisitions >$1M and lender-required on most loans.

Phase II trigger?

Phase I identifies 'recognized environmental condition' (REC). Triggers Phase II sampling (soil borings, groundwater, vapor). Phase II cost: $8k-$50k typical. Historical gas stations, dry cleaners, manufacturing sites most common triggers.

Remediation range?

Low: $20k-50k (soil removal, closure). Mid: $100k-500k (plume delineation, pump-and-treat). High: $1M-$10M+ (major contamination, long-term monitoring). Adjacent property concerns. Regulatory closure process lengthy (1-5 years).