Reviewed by Casa Academy and updated July 29, 2026 using the current DBPR checklist and Pearson VUE scheduling guidance.
Nonhomogeneity
Nonhomogeneity, also called heterogeneity, is the principle that no two parcels of real estate are exactly alike because of unique location, improvements, legal encumbrances, and market timing, requiring appraisers and agents to adjust comparable sales rather than treat properties as interchangeable commodities.
Exam context
Nonhomogeneity means no two properties identical. Supports sales comparison adjustments. Homogeneous products would not need comp adjustments. Location is a key differentiator.
Impact on valuation
Even identical floor plans differ by street noise, view, flood zone, or school district. Appraisers document dissimilarities and apply dollar or percentage adjustments for time, location, and features. Automated valuation models struggle where nonhomogeneity is extreme, such as waterfront or historic districts.
Market behavior
Buyers compare substitutes but negotiate based on property-specific defects and premiums. Sellers cannot assume uniform pricing per square foot across a metro area. Agents educate clients that nonhomogeneity supports professional appraisal and broker price opinions over generic online estimates.
Examples
Same model, different value
Two tract homes share a builder plan but one backs to a busy road. The inferior location sells for $25,000 less after market exposure, illustrating nonhomogeneity despite similar size.
Appraisal adjustment
An appraiser selects three closed sales and adds $18,000 to a comp for the subject's extra garage bay, reflecting nonhomogeneous improvement differences.
Keep studying
Related terms
- Market data approachValuation method relying on adjusted comparable sales.
- Bundle of rightsLegal interests that differ parcel by parcel.
Related resources
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Florida-specific explainers and question sets for this topic area.
Sources
- Appraisal Institute: valuation principles(Appraisal Institute)