Our Methodology

1 Data Sources

The foundation of accurate comparable sales analysis is reliable data. The TAC Comps Tool aggregates data from multiple authoritative sources to deliver comprehensive market coverage.

California Regional Multiple Listing Service (CRMLS)

Our primary data source is CRMLS, the largest multiple listing service in the United States. With over 9.6 million property records, CRMLS provides the most comprehensive real estate transaction data available in Southern California. This includes sold properties, active listings, pending sales, and historical records essential for accurate comparable analysis.

High-Performance Data Pipeline

Our data infrastructure processes large datasets with minimal overhead, delivering comparable sales results in seconds. The pipeline refreshes continuously to ensure you receive the most current market information available.

County Assessor Records

We supplement MLS data with county assessor records to verify property characteristics, square footage measurements, and lot dimensions. This cross-referencing approach ensures the highest level of data accuracy in our comparable selection process.

2 Comparable Selection Process

Identifying truly comparable properties requires more than simple proximity matching. Our methodology applies multiple filters and adjustments to ensure each selected comparable provides meaningful market context.

Multi-Factor Matching

Our selection process evaluates proximity, property type, size, age, and other relevant characteristics to identify the most meaningful comparable sales. Each factor is weighted based on its impact on property value in the local market.

Recency Prioritization

Recent sales carry the most weight in our analysis. We prioritize the most current transactions and extend the search window only when necessary, with appropriate adjustments for market conditions.

Arms-Length Transaction Filtering

We filter out non-arms-length transactions to ensure our comparable sales reflect true market value rather than distressed or atypical transaction prices.

3 Valuation Approach

The TAC Comps Tool applies the Sales Comparison Approach, the primary methodology used by certified residential appraisers for single-family homes and condominiums.

Sales Comparison Approach (Primary)

This approach determines value by comparing the subject property to similar properties that have recently sold in the same market area. Our analysis considers market conditions, comparable selection, adjustment factors, and value reconciliation.

Market Trend Analysis

Our analysis considers broader market trends including inventory levels, days on market, and price appreciation rates. This contextual understanding helps interpret whether recent sales represent typical market conditions or temporary anomalies.

4 Accuracy Standards

Thomas Appraisal Company adheres to the highest professional standards in residential property valuation. Our methodology reflects industry best practices and regulatory compliance requirements.

ANSI Z765-2021 Measurement Standards

We follow ANSI Z765-2021, the national standard for measuring single-family residential buildings. This ensures consistent, accurate square footage calculations that align with industry best practices.

USPAP Compliance Awareness

While the TAC Comps Tool provides comparable sales analysis rather than formal appraisals, our processes are designed with awareness of Uniform Standards of Professional Appraisal Practice (USPAP) requirements. For USPAP-compliant formal appraisals, visit ScheduleAppraisal.com.

Data Freshness

Our data pipeline operates continuously to maintain currency. Each analysis includes a data freshness timestamp so you know exactly how current the information is.

Quality Control

Automated quality controls flag potential data anomalies to help ensure the reliability of every comparable sales report.

5 Team Credentials

The TAC Comps Tool was developed and is maintained by certified appraisal professionals with deep expertise in Southern California real estate markets.