What Site and Location Analysis Covers
When you apply for a Fannie Mae-backed mortgage, the appraiser doesn't just look at your house. They examine the entire site and surrounding area to determine if your property meets Fannie Mae's standards and how location factors affect its value.
The appraiser analyzes physical site characteristics like size, topography, and available utilities. They also evaluate location factors including zoning compliance, street access, flood risk, and any environmental concerns in the neighborhood.
Say you're buying a home on a half-acre lot in a suburban neighborhood. The appraiser will verify the property is properly zoned for residential use, has adequate utilities, sits on a public street, and isn't affected by nearby environmental hazards. All these factors influence whether Fannie Mae will purchase your loan.
Zoning Requirements That Matter
Your property must have legal zoning compliance or legal non-conforming status. Legal non-conforming means the property was built before current zoning rules took effect but remains a permitted use.
Properties with illegal zoning compliance generally don't qualify for Fannie Mae financing. The exception is single-family homes with accessory dwelling units that meet specific requirements outlined in [[Section 5601.2]].
Here's a common scenario: You find a house that was converted from single-family to duplex use, but the zoning still shows single-family residential. If this conversion happened without proper permits, the property has illegal zoning compliance and won't qualify for Fannie Mae financing.
The appraiser must also confirm the highest and best use of your property matches its current use. If you're buying a residential property, its highest and best use must be residential, not commercial or agricultural.
Utility and Access Standards
Your property needs permanent connections to utilities that meet community standards. This typically means electricity, water, sewer or septic, and often natural gas or propane service.
The appraiser compares your property's utilities to similar homes in the area. If your property relies on a well and septic system while most comparable sales have city water and sewer, the appraiser must explain how this difference affects value.
Street access presents another requirement. Your property must have legal access via streets that meet community maintenance standards. Private roads are acceptable if they comply with requirements in [[Section 4702.4(e)]].
Consider a rural property accessed by a gravel road maintained by a homeowners association. This arrangement works as long as the road meets local standards and you have legal access rights. The appraiser will compare this to similar properties and adjust the valuation accordingly.
Environmental and Safety Concerns
The appraiser must identify environmental hazards that could affect your property's value or marketability. This includes contaminated sites, hazardous substances, and adverse conditions in your neighborhood.
Common environmental issues requiring analysis include proximity to industrial sites, waste treatment facilities, airport flight paths, or areas with ground water contamination. The appraiser must explain how these factors impact your property's market value.
Your lender must inform the appraiser about any known contaminated sites in your neighborhood when ordering the appraisal. The appraiser then analyzes how this contamination affects your property's value and marketability.
Detrimental site conditions like expansive soils, underground mines, or subsidence require special attention. If these conditions exist on your property, the appraisal becomes "subject to" inspection by a qualified professional.
Flood Zone Considerations
Properties in Special Flood Hazard Areas identified by FEMA require additional analysis. The appraiser must explain how flood risk affects your property's value and marketability, though they don't always determine the flood zone themselves.
Your lender handles flood zone determination and insurance requirements separately, as outlined in [[Section 4703.3]]. The appraiser focuses on how flood risk impacts property value compared to similar homes.
A property in a flood zone might require flood insurance costing several thousand dollars annually. The appraiser considers whether this ongoing expense affects the property's marketability compared to similar homes outside flood zones.
Documentation the Appraiser Needs
The appraiser gathers information from multiple sources to complete the site and location analysis. They research public records for zoning information, utility availability, and environmental concerns.
Your lender provides the appraiser with any known environmental issues in your neighborhood. The appraiser also conducts visual inspections and may consult local planning departments or environmental agencies.
For properties with detrimental conditions, you'll need inspection reports from qualified professionals. These reports must either confirm repairs were completed or verify the conditions don't require remediation.
When Properties Don't Qualify
Certain site and location issues make properties ineligible for Fannie Mae financing. Properties subject to coastal tideland, wetland, or setback regulations that prevent rebuilding don't qualify if these restrictions would apply after damage or destruction.
Properties with illegal zoning compliance generally don't qualify, except for single-family homes with accessory dwelling units meeting specific criteria. Four-unit properties with accessory dwelling units never qualify, regardless of zoning compliance.
Environmental contamination doesn't automatically disqualify a property, but severe contamination affecting habitability or marketability could make financing impossible. The appraiser's analysis determines whether environmental issues create insurmountable value or marketability problems.
Why These Rules Exist
Fannie Mae's site and location requirements protect both borrowers and investors. Properties with legal zoning compliance and adequate utilities maintain better long-term value and marketability.
Environmental disclosures prevent buyers from unknowingly purchasing properties with hidden hazards. Requiring professional inspections for detrimental conditions ensures safety issues are properly addressed before closing.
The highest and best use requirement ensures properties are being used appropriately for their zoning and market conditions. This prevents financing residential properties that would be more valuable for commercial use, which could create appraisal and resale issues.
Common Problems to Watch For
Zoning violations often surface during the appraisal process. Unpermitted additions, converted garages used as living space, or home businesses operating without proper permits can create compliance issues.
Utility problems frequently arise with rural properties or older homes. Wells with contamination issues, failing septic systems, or inadequate electrical service can affect both property value and loan eligibility.
Environmental concerns sometimes emerge late in the process. Previous underground storage tanks, nearby industrial activities, or soil contamination might not be obvious until the appraiser researches the area's history.
Properties near airports, industrial facilities, or major highways may face marketability challenges. While not automatically disqualifying, these location factors require careful analysis of their impact on property value.
References
For the official guidelines, see 5605.4: Site and location analysis in the Fannie Mae Selling Guide.
Mortgage guidelines change. Stay current.
Fannie Mae and Freddie Mac update their rules several times a year. Get notified when changes affect your mortgage eligibility, required documents, or loan terms.
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Original Freddie Mac Guideline Text
Bulletin 2025-7
, which announced the policy requirements for Uniform Appraisal Dataset (UAD) 3.6. Sellers may submit to the Uniform Collateral Data Portal
®
appraisal reports that use UAD 3.6 before the mandatory effective November 2, 2026 version of this section.
This section contains requirements related to:
Property characteristics
Environmental issues and detrimental conditions
(a)
Property characteristics
The “Site” section of the appraisal report must accurately describe the physical characteristics of the site, site improvements, site view and available utilities, and it must fully analyze any locational factors affecting the site.
(i)
Zoning
The appraisal report must accurately describe:
The zoning classification
A description of the zoning classification
Whether the land use of the subject property represents a legal use, a legal non-conforming use (commonly referred to as grandfathered use), or an illegal use, or there is no zoning
(A)
Eligible zoning classification
Freddie Mac does not limit Mortgage purchases to Mortgages secured by properties with specific zoning classifications; however, the Mortgaged Premises zoning classification is an important characteristic the Seller must consider when determining whether the Mortgage is eligible for sale to Freddie Mac.
Example:
If a property is zoned for agricultural use, the Seller must ensure the property is residential in nature, its residential use is a permissible use under the zoning classification and its use does not primarily involve commercial activities such as farming or ranching.
(B)
Eligible zoning compliance
The zoning compliance must be either legal or legal non-conforming.
A 1-unit property with an ADU that has illegal zoning compliance may be eligible if the requirements of
Section 5601.2
are met.
A 2- or 3-unit property with an ADU must have legal or legal non-conforming zoning compliance.
A 4-unit property with an ADU is not eligible.
Mortgaged Premises in jurisdictions with no zoning are acceptable security for Mortgages delivered to Freddie Mac.
For Mortgaged Premises with a land use that is legal non-conforming, the appraisal report must reflect any adverse effect the non-conforming use has on the opinion of market value.
A Mortgage is ineligible for sale to Freddie Mac if the Mortgage is secured by property that is subject to coastal tideland, wetland or setback laws or regulations that prevent the rebuilding or maintenance of the property improvements if they are damaged or destroyed.
(ii)
Highest and best use
For the Mortgage to be eligible for sale to Freddie Mac, the highest and best use of the subject property as improved (or as proposed per plans and specifications) must be the present use.
(iii)
Utilities
The appraisal report must describe the utilities permanently connected to the site and the impact to value and marketability. The utilities serving the subject property must meet community standards. The comparable sales should have utilities similar to the subject property.
When differences in utilities exist between the subject property and the comparable sales, any adjustments or lack of adjustments made to the comparable sales for significant differences must be explained in the comments area or on an attached addendum.
(iv)
Streets
The subject property must have legal ingress and egress by streets constructed and maintained in a manner that meets community standards. Refer to
Section 4702.4(e)
for requirements related to access provided by a private road, joint-driveway or easement.
The appraisal report should contain comparable sales with street access, ownership, maintenance and materials similar to the subject property.
When differences in street access, ownership, maintenance or materials exist between the subject property and a comparable sale, the appraisal report must include justification and support for the adjustments, or lack of adjustments, made to the comparable sale. The appraisal report should include an explanation of the effect these differences have on the subject property’s value or marketability.
(v)
Site size
Freddie Mac does not limit Mortgage purchases based on the size of the subject property site. The appraisal report must identify the total area of the site. The appraisal report should include comparable sales with similar site sizes.
When differences in site size exist between the subject property and the comparable sales, the appraisal report must include an explanation in the comments area of the appraisal report or on an attached addendum for any adjustments or lack of adjustments made for significant differences in site size between the subject property and the comparable sales and the effect these differences have on the subject property’s value or marketability.
(vi)
Flood hazard area
The flood hazard section of the appraisal report is not required to be completed if the flood zone is determined by another party, such as a non-appraiser on the staff of the Seller, a surveyor or a specialized flood zone determination company.
If the property is in a “Special Flood Hazard Area” as identified by the Federal Emergency Management Agency through the National Flood Insurance Program, the appraisal report must describe any impacts this has on the subject property’s value or marketability.
Section 4703.3
for flood zone determination and flood insurance requirements.
(b)
Environmental issues and detrimental conditions
(i)
Impact of Contaminated Sites, Hazardous Substances and other adverse conditions
If the Seller knows of the existence of a Contaminated Site in the Neighborhood where the property is located, it must inform the appraiser of the Contaminated Site when ordering the appraisal.
The appraisal report must identify any known environmental issues, such as Contaminated Sites, Hazardous Substances or other adverse conditions, that affect the property or the Neighborhood in which the property is located.
The appraisal report must include adjustments to reflect any impact on market value and commentary on any effect to the marketability of the subject property.
Examples of conditions that require analysis and commentary include, but are not limited to:
Presence of asbestos, urea-formaldehyde or any similar insulation in the dwelling
Proximity of the subject property to:
A Contaminated Site
Ground water contamination, chemical or petroleum spills or other Hazardous Substances that are expected to impact the area for more than one year
Areas that may affect the value or marketability of the subject property, including, but not limited to:
Waste or water treatment facilities
Commercial establishments (other than retail establishments that serve the Neighborhood)
(ii)
Detrimental conditions
The appraisal report must identify the presence of detrimental conditions, such as expansive soils, underground mines or subsidence, in the immediate area or on the subject property site. If the detrimental condition(s) is located on the subject property site, the appraisal report must be made “subject to” an inspection by an appropriately licensed professional or another person trained in the particular field of concern to determine if a repair or alteration is required.
The appraiser must consider the effect the condition(s) may have on estimating the subject property’s market value and marketability.
For any appraisal report that is made subject to an inspection(s) due to a detrimental condition(s), the Seller must include in the Mortgage file evidence of repair, alteration or an inspection report indicates the condition does not require or alteration. (See
Section 5605.8
for additional information related to appraisal reports completed “subject to” and inspection.)
