ADU Research
& Housing Data
Independent, data-driven research on accessory dwelling units. Policy analysis, construction economics, financing markets, and housing supply impact.
50+
Data Sources
All 50
U.S. States
2026
Current Data
Open
Methodology
Publications
Research & Data
Government-sourced data, original analysis, and citable statistics. Every number links to its original source.
Focus Areas
Research Domains
Six core domains spanning the full ADU lifecycle — from policy environment to financial outcome.
Publication Types
What We Publish
Every publication follows our open methodology standard and is designed for citation, reference, and policy application.
Research Briefs
Focused, 2,000-5,000-word analyses of specific ADU topics with cited data and clear methodology.
Data Reports
Quantitative publications with original datasets, visualizations, and downloadable tables.
Policy Analysis
Pre/post analysis of zoning reform, permit streamlining, and regulatory change impact on ADU production.
Market Snapshots
Quarterly updates on ADU construction costs, permit volumes, financing trends, and rental market data.
Standards
Research
Methodology
Our credibility depends on methodological rigor. Every publication follows these standards without exception.
All research published under the Dwelling Index Research imprint adheres to our public methodology framework. We disclose data sources, analytical methods, sample limitations, and potential conflicts of interest for every publication.
Full methodology documentation available with each publication.
Primary Sources Only
Government datasets, regulatory filings, lender documentation, and direct-survey data. No aggregator citations.
Reproducible Analysis
Published methodologies, disclosed sample sizes, stated confidence intervals, and version-controlled data pipelines.
Independent Editorial
Research funding, if any, is disclosed. Findings are published regardless of outcome. No sponsor review or approval.
Peer-Reviewed When Possible
External subject-matter review for major publications. Correction policy published and followed.
Audience
Built for Citation
Structured for the people who shape housing policy, inform public understanding, and make investment decisions.
Journalists & Media
- Citable data points with source attribution
- One-click stat & citation copy buttons
- Pre-formatted suggested citations (APA, Chicago, Plain)
- Press-ready charts and visualizations
Policymakers & Planners
- Before/after analysis of zoning reform outcomes
- Comparative policy frameworks across jurisdictions
- Housing supply impact quantification
- Regulatory cost-benefit breakdowns
Researchers & Academics
- Disclosed methodology and data sources
- Downloadable datasets (CSV and JSON)
- Clear limitations and scope statements
- CC BY 4.0 license for citation and redistribution
Research Updates
New publications, data releases, and policy briefs delivered to your inbox. No marketing — just research.
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