What the Site Section Covers
The site section of your appraisal report examines the land your home sits on and how it affects the property's value and marketability. The appraiser looks at size, shape, topography, utilities, zoning compliance, and any conditions that might impact your ability to sell the property later.
Think of this as the foundation analysis for your loan approval. Even if your house is perfect, problems with the site can derail your mortgage application.
How Appraisers Analyze Property Size and Boundaries
The appraiser must evaluate your entire property, not just the portion you plan to use. Say you're buying a house on a 5-acre lot but only plan to use the area around the home. The appraiser cannot just appraise that smaller section. They must consider the full 5 acres and how it affects the property's value.
This rule prevents inflated values based on hypothetical subdivisions. If your property includes extra land, that land becomes part of the value calculation whether you want it or not.
Zoning Requirements That Can Stop Your Loan
Your property must fall into one of these categories for Fannie Mae approval:
- Legal conforming use (the current use matches zoning requirements)
- Legal nonconforming use (grandfathered use that no longer matches current zoning)
- No local zoning exists
Fannie Mae will not purchase loans on properties with illegal uses under zoning regulations. The appraiser must clearly identify which category applies to your property.
If your property has a legal nonconforming use, the appraiser must analyze how this affects value and marketability. A duplex in an area now zoned for single-family homes might be legal but harder to sell, which the appraisal must reflect.
Understanding Highest and Best Use Analysis
Your property must represent the highest and best use of the site as improved. This means the current improvements should be the most profitable use of the land given legal, physical, and financial constraints.
The appraiser asks: "Is this house the best thing you could build on this lot?" If your modest ranch home sits on prime commercial land worth millions, the improvements might not represent highest and best use.
However, the analysis considers practical reality. Your existing home continues as highest and best use until it becomes financially feasible to tear it down and build something else. Most residential properties easily meet this test.
Utility Requirements and Access Rights
Your property must have utilities that meet community standards. This typically means connection to public water and sewer systems where available. If public utilities don't exist, you need access to private well and septic systems.
The key requirement is legal access rights. You must own the utilities or have legally binding agreements for access and maintenance. A handshake deal with your neighbor about sharing a well won't satisfy Fannie Mae requirements.
Private utilities must be located on your property unless you have proper legal agreements for off-site access. These agreements must be recorded and binding on future owners.
Private Street Maintenance Agreements
If your property sits on a private street, you need a legally enforceable maintenance agreement. This agreement must be recorded in public records and include specific provisions:
- Each property owner's share of repair costs
- Default remedies if someone doesn't pay
- Perpetual term that binds future owners
Some states have laws that automatically assign maintenance responsibilities to property owners. In these states, no separate agreement is required.
Without proper agreements, your lender must indemnify Fannie Mae against losses related to street conditions or access issues. This can complicate your loan approval.
Environmental and Flood Zone Considerations
The appraiser must identify whether your property sits in a Special Flood Hazard Area designated by FEMA. They'll note the specific flood zone, map number, and effective date. This information determines your flood insurance requirements under [[B7-3-06]].
Properties subject to certain environmental regulations face restrictions. Fannie Mae won't purchase loans on properties where coastal or wetland laws prevent rebuilding if the home is damaged or destroyed. These regulations aim to remove existing development over time.
If environmental hazards affect well water, septic systems, or public utilities in your area, the appraiser must address how this impacts value and marketability.
Documents the Appraiser Reviews
The appraiser gathers information from multiple sources to complete the site analysis:
- Local zoning maps and regulations
- Property surveys showing exact boundaries
- Utility company records or well/septic permits
- FEMA flood maps
- Private street maintenance agreements
- Environmental hazard assessments when applicable
You don't need to provide these documents directly. The appraiser obtains them as part of their research process.
Common Issues That Complicate Site Analysis
Zoning violations represent the biggest risk to loan approval. If your property has an illegal use, Fannie Mae cannot purchase the loan. This includes unpermitted additions that violate setback requirements or density restrictions.
Shared driveways and utilities create complications when access rights aren't properly documented. Even if you've used a shared driveway for years, you need recorded easements or agreements.
Properties with excess land can create valuation challenges. A house on 40 acres in a suburban neighborhood might not represent highest and best use if the land is worth more for development than residential use.
Flood zone changes between contract and closing can affect insurance requirements and loan terms. Recent FEMA map updates might place your property in a flood zone that wasn't previously designated.
Why These Rules Exist
Fannie Mae's site requirements protect against properties that might lose value or become unmarketable. A home with zoning violations faces potential enforcement action. Properties without proper utility access might lose essential services.
The highest and best use analysis ensures the loan amount reflects realistic property values. Lending $500,000 on a small house sitting on million-dollar commercial land creates obvious risks.
Private street agreements prevent situations where roads deteriorate and properties become inaccessible. Without legal maintenance obligations, homeowners might find themselves trapped with no way to enforce road repairs.
References
For the official guidelines, see B4-1.3-04: Site Section of the Appraisal Report 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.
No spam · Unsubscribe anytime
Original Fannie Mae Guideline Text
B4-1.3-04, Site Section of the Appraisal Report (06/04/2025)
Off-Site Improvements
Community-Owned or Privately Maintained Streets
Special Flood Hazard Areas
Uniform Appraisal Dataset (UAD) 3.6 Policy
Overview
The property site should be of a size, shape, and topography that is generally conforming and acceptable in the market area. It must also have competitive utilities, street improvements, adequate vehicular access, and other amenities (see Property Requirements in B2-3-01, General Property Eligibility for additional information). Because amenities, easements, and encroachments may either detract from or enhance the marketability of a site, the appraiser must reflect them in the analysis and evaluation. The appraiser must comment if the site has adverse conditions or if there is market resistance to a property because the site is not compatible with the neighborhood or the requirements of the competitive market, and assess the effect, if any, on the value and marketability of the property.
Site Analysis
The appraisal must include the actual size of the site and not a hypothetical portion of the site for the subject property. For example, the appraiser may not appraise only 5 acres of an unsubdivided 40–acre parcel. The appraised value must reflect the entire 40–acre parcel.
Subject Property Zoning
The appraiser must report the specific zoning class in the appraisal, along with a general statement as to what the zoning permits, such as one- or two-unit, when they indicate a specific zoning such as R-1 or R-2. The appraisal must indicate whether the subject property presents
a legal conforming use,
a legal non-conforming (grandfathered) use,
an illegal use under the zoning regulations, or
no local zoning.
Fannie Mae only purchases or securitizes loans on properties if the improvements constitute a legal conforming use of the land. However, Fannie Mae will purchase or securitize a loan for a property that constitutes a legal, nonconforming use of the land provided that the appraisal analysis reflects any adverse effect that the nonconforming use has on the value and the marketability of the property. This requirement applies to all property types.
Fannie Mae will not purchase or securitize a loan secured by a property that is subject to certain land-use regulations, such as coastal tideland or wetland laws, that create setback lines or other provisions that prevent the reconstruction or maintenance of the property improvements if they are damaged or destroyed. The intent of these types of land-use regulations is to remove existing land uses and to stop land development, including the maintenance or construction of seawalls, within specific setback lines.
For information regarding accessory dwelling units that comply or do not comply with zoning, see B4-1.3-05, Improvements Section of the Appraisal Report.
Highest and Best Use
Fannie Mae will only purchase or securitize a loan that represents the highest and best use of the site as improved. If the current improvements clearly do not represent the highest and best use of the site as an improved site, it must be indicated on the appraisal report.
The appraiser determines highest and best use of a site as the reasonable and probable use that supports the highest present value on the effective date of the appraisal. For improvements to represent the highest and best use of a site, they must be legally permitted, financially feasible, and physically possible, and must provide more profit than any other use of the site would generate. All of those criteria must be met if the improvements are to be considered as the highest and best use of a site.
The appraiser’s highest and best use analysis of the subject property should consider the property as it is improved. This treatment recognizes the existing improvements should continue in use until it is financially feasible to remove the dwelling and build a new one, or to renovate the existing dwelling. If the use of comparable sales demonstrates that the improvements are reasonably typical and compatible with market demand for the neighborhood, and the present improvements contribute to the value of the subject property so that its value is greater than the estimated vacant site value, the appraiser should consider the existing use as reasonable and report it as the highest and best use.
Adjoining Properties
The appraiser must consider the present or anticipated use of any adjoining property that may adversely affect the value or marketability of the subject property.
Site Utilities
For loans to be eligible for purchase or securitization, the utilities of the property must meet community standards. If public sewer and/or water facilities, those that are supplied and regulated by the local government, are not available, community or private well and septic facilities must be available and utilized by the subject property. The owners of the subject property must have the right to access those facilities, which must be viable on an ongoing basis. Private well or septic facilities must be located on the subject site, unless the subject property has the right to access off-site private facilities and there is an adequate, legally binding agreement for access and maintenance.
If there is market resistance to an area because of environmental hazards or any other conditions that affect well, septic, or public water facilities, the appraisal must address the effect of the hazards on the value and marketability of the subject property (see B4-1.4-08, Environmental Hazards Appraisal Requirements).
Off-Site Improvements
Off-site improvements include, but are not limited to, streets, alleys, sidewalks, curbs and gutters, and street lights. The subject property should front on a publicly dedicated and maintained street that meets community standards and is generally accepted by area residents. If a property fronts on a street that is not typical of those found in the community, the appraiser must address the effect of that location on the value and marketability of the subject property.
The presence of sidewalks, curbs and gutters, street lights, and alleys depends on local custom. If they are typical in the community, they should be present on the subject site. The appraiser must comment on any adverse conditions and address their effect on the value and marketability of the subject property.
Community-Owned or Privately Maintained Streets
If the property is located on a community-owned or privately-owned and maintained street, an adequate, legally enforceable agreement or covenant for maintenance of the street is required. The agreement or covenant should include the following provisions and be recorded in the land records of the appropriate jurisdiction:
responsibility for payment of repairs, including each party’s representative share;
default remedies in the event a party to the agreement or covenant fails to comply with their obligations; and
the effective term of the agreement or covenant, which in most cases should be perpetual and binding on any future owners.
Note: If the property is located within a state that has statutory provisions that define the responsibilities of property owners for the maintenance and repair of a private street, no separate agreement or covenant is required.
If the property is not located in a state that imposes statutory requirements for maintenance, and either there is no agreement or covenant for maintenance of the street, or an agreement or covenant exists but does not meet the requirements listed above, the lender may still sell the loan. However, the lender is required to indemnify Fannie Mae (as described in A2-1-03, Indemnification for Losses) against all losses incurred by Fannie Mae as a result of the physical condition of the street or in order to establish and/or retain access to the street.
Special Flood Hazard Areas
Fannie Mae’s appraisal report forms provide an area for the appraiser to indicate whether the property is located in a Special Flood Hazard Area that is identified on the Federal Emergency Management Agency’s (FEMA) Flood Insurance Rate Maps. The appraiser must also indicate the specific FEMA flood zone and the map number and its effective date. For additional information concerning Fannie Mae’s policies on flood insurance, see B7-3-06, Flood Insurance Requirements for All Property Types.
Uniform Appraisal Dataset (UAD) 3.6 Policy
Lenders using UAD 3.6 must follow the requirements in the UAD 3.6 Policy Supplement.
The table below provides references to the Announcements that have been issued that are related to this topic.
