Multiple methods exist for estimating property value. Each serves different purposes, has different levels of accuracy, and is appropriate for different situations. Understanding the differences helps property owners choose the right valuation method for their needs.Documentation Index
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Valuation Methods Overview
| Method | Who Creates | Cost | Accuracy | Best For |
|---|---|---|---|---|
| Appraisal | Licensed appraiser | $400 - $600 | Highest | Mortgages, legal matters |
| CMA | Real estate agent | Free | Good | Listing, buying decisions |
| AVM | Computer algorithm | Free to $50 | Variable | Quick estimates |
| BPO | Real estate agent | $50 - $150 | Moderate | Lender decisions |
| Tax Assessment | Government assessor | N/A | Variable | Property taxes |
Professional Appraisal
What it is
What it is
Independent opinion of value by licensed or certified appraiser following professional standards (USPAP).Includes physical inspection, market research, comparable analysis, and detailed report.
Strengths
Strengths
- Performed by licensed professional
- Follows standardized methodology
- Includes physical inspection
- Considers property-specific factors
- Legally defensible
- Required for mortgage lending
- Accountable to professional standards
Limitations
Limitations
- Costs $400 - $600+
- Takes 1-2 weeks
- Point-in-time value only
- Dependent on appraiser competence
- Can’t predict future values
When required
When required
- Most mortgage transactions
- Legal matters (estate, divorce)
- IRS purposes (donations, estates)
- Insurance disputes
- Litigation
Comparative Market Analysis (CMA)
What it is
What it is
Analysis of comparable sales prepared by real estate agent. Uses MLS data to estimate market value.Not an appraisal. Agent provides opinion based on market knowledge and comparable sales.
Strengths
Strengths
- Free (provided by agent seeking listing)
- Quick turnaround
- Local market expertise
- Includes active and pending listings
- Considers current market conditions
- Good for pricing decisions
Limitations
Limitations
- Not independent (agent may have interest in outcome)
- No professional standards required
- Quality varies by agent
- Not accepted for lending
- No physical inspection required
- Not legally defensible
When appropriate
When appropriate
- Deciding whether to sell
- Setting listing price
- Making offer on property
- General market knowledge
- Preliminary value estimate
CMA vs appraisal
CMA vs appraisal
| Factor | CMA | Appraisal |
|---|---|---|
| Creator | Agent | Licensed appraiser |
| Cost | Free | $400 - $600 |
| Standards | None required | USPAP |
| Independence | May have interest | Required independence |
| Inspection | Optional | Required |
| Legal use | No | Yes |
| Lending use | No | Yes |
CMAs are useful tools but are not appraisals. Agents providing CMAs may benefit from higher values (higher commission) or may undervalue to get quick sale. Consider the source when evaluating.
Automated Valuation Model (AVM)
What it is
What it is
Computer-generated estimate using algorithms, public records, and market data. No human inspection or analysis.Examples: Zillow Zestimate, Redfin Estimate, bank AVM tools.
How it works
How it works
Algorithm analyzes:
- Public records (square footage, lot size, age)
- Recent sales in area
- Tax assessments
- Listing history
- Market trends
Strengths
Strengths
- Instant results
- Free or low cost
- Covers most properties
- Useful for quick estimates
- Updates regularly
- Consistent methodology
Limitations
Limitations
- Cannot see inside property
- Doesn’t know about renovations
- Misses unique features
- Accuracy varies significantly
- Can be wildly wrong
- Based on potentially outdated data
- No accountability
Accuracy
Accuracy
Zillow reports median error of about 2-7% for on-market homes, higher for off-market.What this means:
- Half of estimates are off by more than this amount
- Individual property errors can be 10-20%+
- Unique properties have higher error rates
- Recently renovated homes often undervalued
- Unusual markets have less accuracy
When appropriate
When appropriate
- General ballpark estimate
- Monitoring value over time
- Preliminary research
- Comparing neighborhoods
- Setting listing price (without other data)
- Making offers
- Legal or lending purposes
- Insurance coverage decisions
Broker Price Opinion (BPO)
What it is
What it is
Valuation by licensed real estate broker, less detailed than appraisal. Often includes exterior inspection only.Used primarily by lenders for internal decisions, not for mortgage origination.
Types
Types
Drive-by BPO: Exterior inspection only. Agent views from street.Interior BPO: Agent enters property to assess condition and features.Desktop BPO: No inspection. Based on data and photos only.
When used
When used
- Short sale decisions
- Foreclosure valuations
- REO (bank-owned) pricing
- Portfolio monitoring
- HELOC reviews
- Loss mitigation
BPO vs appraisal
BPO vs appraisal
| Factor | BPO | Appraisal |
|---|---|---|
| Creator | Real estate broker | Licensed appraiser |
| Cost | $50 - $150 | $400 - $600 |
| Standards | Varies | USPAP |
| Detail | Limited | Comprehensive |
| Inspection | Often exterior only | Full interior |
| Mortgage use | No | Yes |
Tax Assessment
What it is
What it is
Government valuation for property tax purposes. Performed by county or municipal assessor.Not intended to reflect precise market value.
How it works
How it works
Assessors use mass appraisal techniques:
- Statistical models
- Property characteristics from records
- Sales data from the area
- Cost data for construction
Relationship to market value
Relationship to market value
Tax assessment may equal, exceed, or fall below market value.Assessment ratio: Some jurisdictions assess at percentage of market value (e.g., 80%).Timing lag: Assessments may be based on data 1-3 years old.Mass appraisal limitations: Individual property differences may not be captured.
Why it differs from appraisal
Why it differs from appraisal
- Different purpose (taxation vs lending)
- Different methodology (mass vs individual)
- Different timing (periodic vs current)
- Different standards
- No interior inspection
- May not reflect recent improvements
Using assessment for value
Using assessment for value
Don’t rely on tax assessment for:
- Listing price
- Offer amount
- True market value
Choosing the Right Method
For selling your home
For selling your home
Start with: CMA from experienced local agentConsider adding: Pre-listing appraisal for pricing confidenceUse AVMs for: Ballpark sanity check only
For buying a home
For buying a home
Rely on: Appraisal ordered by lenderUse CMA for: Informing offer strategyUse AVM for: Quick neighborhood research
For refinancing
For refinancing
Required: Appraisal (lender orders)For preliminary estimate: AVM or agent opinion
For legal matters
For legal matters
Required: Professional appraisalEstate, divorce, litigation all need defensible appraisal from licensed professional.
For property taxes
For property taxes
To challenge assessment: Professional appraisal showing market value is lower than assessed value.
For insurance
For insurance
For replacement cost: Appraisal or insurance company’s estimateMarket value differs from replacement cost. Don’t use AVM or CMA for insurance decisions.
Common Misconceptions
Tax assessment equals market value
Tax assessment equals market value
False. Assessments may be higher or lower than market value and often lag current conditions by years.
Zillow Zestimate is accurate
Zillow Zestimate is accurate
Sometimes, but often not. Accuracy varies widely by property type and market. Can be off by 10-20% or more.
CMA is same as appraisal
CMA is same as appraisal
No. CMAs are helpful but lack independence, standardized methodology, and legal standing of appraisals.
Higher value is always better
Higher value is always better
Depends on purpose. For buying, lower appraisal protects from overpaying. For refinancing, higher value helps. Context matters.
All appraisals are the same
All appraisals are the same
Appraisal quality varies. Appraiser experience, local knowledge, and methodology all affect reliability.
Next: Comparing Appraisers
Questions to ask and what to look for
Find Appraisers
Research licensed appraisers in your area