What Is Property Valuation?
Property valuation estimates market value using three main methods. The sales comparison approach uses comparable sales—what similar properties sold for. The income approach divides NOI by cap rate—what investors pay for income. The cost approach estimates land value plus replacement cost minus depreciation. For rental property, the income approach usually leads; for owner-occupied or unique properties, comparable sales dominate.
Property valuation is the process of estimating what a property is worth using one or more methods: sales comparison approach, income approach, or cost approach.
At a Glance
- What it is: Process of estimating a property's worth using standardized methods
- Why it matters: Drives offer price, equity calculation, and lender collateral assessment
- Three methods: Sales comparison, income approach, cost approach
- For rentals: Income approach typically leads; comparable sales support
- Reconciliation: Appraisers weight methods based on property type and data quality
How It Works
Sales comparison approach. Uses comparable sales of similar properties. Adjust for differences and derive value. Best for residential, owner-occupied, and properties with plenty of comps. Lenders rely on this for most single-family and small multifamily.
Income approach. Value = NOI ÷ cap rate. A property with $24,000 NOI in a 6.5% cap market is worth $369,000. Best for rental property and investment property. Captures what income-oriented buyers will pay.
Cost approach. Land value + cost to replace the building minus depreciation. Used for new construction, unique properties, or when comps are scarce. Less common for typical resale rental property.
Reconciliation. Appraisers assign weights (e.g., 70% income, 30% sales comparison for a fourplex) and reconcile to a final value. Investors often run multiple methods and use the one that best fits their investment thesis.
Real-World Example
Jenna's valuation of a Tampa duplex. She ran all three. Sales comparison approach: three duplex comps averaged $312,000. Income approach: NOI $22,800, market cap rate 7.2% → $316,667. Cost approach: land $85,000, replacement cost $245,000, depreciation -$18,000 → $312,000. Income and sales comparison aligned; cost approach supported. She used $315,000 as her market value estimate and offered $298,000.
Pros & Cons
- Multiple methods provide cross-check and confidence
- Income approach aligns with how rental property investors think
- Comparable sales reflect actual transaction prices
- Cost approach useful for unique or new construction
- Structured process reduces emotional overpaying
- Each method has limitations and data requirements
- Different methods can produce different values—reconciliation is judgment
- Stale data and market shifts can make valuations wrong quickly
- Appraisal fees add cost ($400–$800 for typical residential)
Watch Out
- Method mismatch: Valuing a fourplex with sales comparison only ignores NOI—use income approach
- Cap rate selection: Wrong cap rate in income approach swings value 10–20%—use recent comparable sales to back into cap rates
- Confirmation bias: Don't pick the method that gives the answer you want
Ask an Investor
The Takeaway
Property valuation uses sales comparison, income approach, and cost approach. For rental property, lead with income approach and support with comparable sales. Run multiple methods; when they align, you have confidence.