Before buying, financing, or developing a commercial property, it is important to check for hidden environmental risks.
An Environmental Site Assessment, or ESA, helps identify concerns such as leaking underground tanks, contaminated soil, polluted groundwater, or hazardous chemicals.
Most property transactions begin with a Phase I ESA. However, if the first assessment identifies a potential issue, a Phase II ESA may be required.
Understanding the difference between Phase I and Phase 2 ESA costs can help buyers, sellers, lenders, and developers plan their budgets more effectively.
Who Should Read This Guide?
This guide is useful for:
● Commercial property buyers
● Real estate investors
● Developers
● Lenders and underwriters
● Property owners preparing to sell or refinance
● Commercial real estate professionals handling due diligence
It explains the differences between Phase 1 and 2 ESA services, typical costs, and when additional environmental testing may be necessary.
What Is a Phase I Environmental Site Assessment?
A Phase I ESA is the first step in environmental due diligence.
It works like a background check for a property. An environmental professional reviews historical records, inspects the site, and interviews owners or occupants.
The purpose is to identify Recognized Environmental Conditions, also called RECs.
These are signs that hazardous substances or petroleum products may have affected the property.
A Phase I ESA usually includes:
● A visual site inspection
● A review of historical property records
● Environmental database research
● Interviews with owners or occupants
● A written report of the findings
A Phase I ESA normally does not include soil, groundwater, or vapor testing.
What Is the Average Cost of Phase 1 Environmental Assessment Work?
The average cost of Phase 1 environmental assessment services is usually between $2,000 and $4,500.
The final price depends on several factors:
Property Size
A small retail property takes less time to inspect than a large industrial site.
Property History
A property with a simple history is easier to assess than one previously used as a factory, gas station, dry cleaner, or repair shop.
Location
Travel charges may apply if the consultant must travel a long distance to reach the property.
Turnaround Time
Rush reports may cost more because they require priority scheduling.
The Phase I ESA cost is generally predictable because the process mainly involves research and visual inspection.
When comparing the Phase 1 ESA cost between consultants, it is also important to review what is included in the assessment rather than choosing only based on price.
What Happens After a Phase I ESA?
If the Phase I ESA does not identify any RECs, further testing may not be required.
However, if the report finds a possible environmental concern, the consultant may recommend a Phase II ESA.
For example, further investigation may be needed if the property:
● Previously operated as a gas station
● Housed a dry-cleaning business
● Used or stored industrial chemicals
● Had underground storage tanks
● Is located near a contaminated site
● Shows signs of spills or improper waste handling
A Phase II recommendation does not automatically mean that contamination exists. It means more investigation may be needed.
What Is a Phase II ESA?
A Phase II Environmental Site Assessment is a hands-on investigation.
Instead of only reviewing records, the environmental team collects physical samples from the property.
A Phase II ESA may include:
● Soil sampling
● Groundwater testing
● Soil vapor testing
● Temporary monitoring wells
● Laboratory analysis
● A written findings report
The purpose is to confirm whether contamination is actually present.
For example, if a Phase I ESA shows that a property was once a gas station, a Phase II ESA may test the soil and groundwater for petroleum leaks.
The main difference between a Phase I and II ESA is that Phase I identifies possible environmental concerns, while Phase II uses physical testing to investigate them.
How Much Does a Phase II ESA Cost?
The main difference is simple: a Phase I ESA involves research, while a Phase II ESA
involves physical testing.
A typical Phase 2 ESA cost ranges from approximately $5,000 to $25,000 or more.
The cost of a Phase 2 environmental assessment varies widely because each investigation is designed around the specific risks found at the property.
A simple project involving a few soil samples may cost much less than a large industrial investigation requiring deep drilling, groundwater wells, and extensive laboratory testing.
Phase I ESA Cost vs Phase II ESA Cost
| Cost Factor | Phase I ESA | Phase II ESA |
| Main purpose | Identify possible environmental concerns | Confirm whether contamination is present |
| Type of work | Records review and site inspection | Sampling and laboratory testing |
| Soil or water testing | Usually not included | Often included |
| Typical cost | $2,000–$4,500 | $5,000–$25,000+ |
| Pricing structure | Usually predictable | Based on a custom scope |
| Equipment required | Limited | Drilling and sampling equipment may be needed |
The main difference is simple: a Phase I ESA involves research, while a Phase II ESA
involves physical testing.
Understanding Phase 1 and 2 ESA pricing can help buyers leave enough room in their due
diligence budget if further investigation becomes necessary.
What Affects Phase II Environmental Site Assessment
Cost?
Several factors influence the final Phase II environmental site assessment cost.
Number of Samples
The more soil, groundwater, or vapor samples required, the higher the cost.
A small property may need only a few soil borings. A large industrial site may require
dozens.
Type of Contamination
Testing for standard petroleum contamination may cost less than testing for solvents, metals,
pesticides, or industrial chemicals.
Specialized laboratory testing can increase the total bill.
Site Accessibility
Open land is usually easier and cheaper to investigate.
Costs may rise when crews must drill through concrete, work inside an occupied building, or
operate around active equipment.
Groundwater Depth
Shallow groundwater is easier to reach.
If groundwater is deep below the surface, crews need more time, equipment, and drilling
materials.
Laboratory Requirements
The number of samples, type of analysis, and required turnaround time all affect laboratory
costs.
Rush testing may also add to the total price.
Who Pays for the ESA?
The buyer or borrower commonly pays for the Phase I ESA because it is part of the due
diligence process.
Payment for a Phase II ESA is often negotiated.
The buyer and seller may agree that:
● The buyer pays
● The seller pays
● The cost is divided
● The seller provides a closing credit
● The cost is deducted from the sale price
The final arrangement depends on the transaction and the seriousness of the environmental
concern.
How to Manage ESA Costs
Environmental testing can feel expensive, but it can prevent much larger financial losses.
Start Early
Order the Phase I ESA early in the due diligence period. This gives you enough time to
complete Phase II testing if necessary.
Get Multiple Quotes
Request proposals from two or three experienced environmental consulting firms.
Make sure each quote clearly explains the scope of work.
Compare the Scope, Not Just the Price
A low quote may include fewer samples or limited laboratory testing.
An incomplete assessment could require additional testing later.
Share Existing Reports
Previous environmental reports, tank records, building plans, and regulatory documents may help the consultant plan the investigation more efficiently.
Is a Phase II ESA Worth the Cost?
The cost of a Phase 2 environmental assessment may seem high, but it can protect you
from far greater expenses.
Without proper testing, a buyer may unknowingly purchase a property with serious
contamination.
This can lead to:
● Cleanup costs
● Construction delays
● Legal disputes
● Regulatory problems
● Difficulty getting financing
● Lower resale value
● Vapor intrusion concerns
In some cases, environmental cleanup can cost hundreds of thousands or even millions of
dollars.
A properly completed Phase II ESA can help buyers understand the risk before closing the
deal.
How SKA Environment Can Help
SKA Environment helps buyers, lenders, property owners, and developers identify
environmental risks during commercial real estate transactions.
Our team can assist with:
● Phase I Environmental Site Assessments
● Identification of Recognized Environmental Conditions
● Phase II environmental investigations when needed
● Soil, groundwater, and vapor assessment
● Clear environmental due diligence reporting
Understanding environmental conditions early can help reduce unexpected costs and
support better property decisions.
Buying, financing, or developing commercial property? Contact SKA Environment to
discuss your Phase I or Phase II ESA needs.
Frequently Asked Questions
The typical Phase I ESA cost is around $2,000 to $4,500, depending on the property size,
location, history, and scope
A Phase II ESA involves physical sampling, laboratory analysis, and sometimes drilling or
groundwater testing, making it more expensive than a Phase I assessment.
No. Phase II testing is generally recommended only when the Phase I assessment identifies
an environmental concern that requires further investigation.
A Phase I ESA looks for potential environmental concerns through records and visual
inspection. A Phase II ESA uses physical testing to determine whether contamination is
present.
Not always. Compare the consultant’s experience and scope of work along with the price to
make sure the assessment meets your due diligence needs.
Final Takeaway
Phase I and Phase II ESAs serve different purposes.
A Phase I ESA identifies possible environmental concerns, while a Phase II ESA
investigates those concerns through physical testing.
Knowing the expected Phase 1 ESA cost and Phase 2 ESA cost can help you budget properly, avoid delays, and understand environmental risks before completing a commercial
property transaction.