How regulated is building a home in your state?

How we built the index & sources

The Construction Regulation Index is a composite score from 0 to 100 (higher = more heavily regulated), built from three factors that can be compared across all 50 states and DC:

1. Contractor licensing (60%)

Each state is placed in one of three tiers: a full state license (exam and/or experience required), registration only (a mandatory state filing, but no competency exam), or no statewide requirement (licensing is local or absent). Each tier was verified against the state’s own contractor-licensing board — for example the Contractors State License Board in California, the Home Builder Registration Unit in Maryland, and the Nevada State Contractors Board — using the requirement that applies to building a new home, not home-improvement or specialty-trade rules.

2. Building-code authority (25%)

Whether a residential building code is adopted at the state level, or left to local jurisdictions. From International Code Council (ICC) adoption data. Note: "statewide" here means a state-adopted code exists — a separate question from whether permits are enforced statewide, which is frequently local even where a state code applies. (Our companion shed-permit study measures the enforcement/threshold question, so a state can read "statewide" here and "local" there without contradiction.)

3. Code recency (15%)

The edition year of the adopted residential code — more recent editions reflect more current requirements. From ICC adoption records.

The score, concretely: licensing contributes up to 60 points (full license 60, registration 30, none 0), code authority up to 25 (statewide 25, local 0), and recency up to 15 (2024 edition 15, 2021 12, 2018 8, 2015 5, none 0). The three add up to the 0–100 score shown in the first table column — so any reader can reproduce it.

The score is built only from the three factors above. We deliberately exclude the dollar threshold that triggers a license: states measure it differently (per contract, per project, or per year), the figures change with each legislative session, and several published values proved unreliable on review, so including them would risk stating outdated numbers as fact.

Important limits

This index measures the state-level baseline. Cities and counties frequently regulate more strictly than the state (a "lightly regulated" state can contain a strict city). License thresholds are not strictly comparable because states measure them differently (per contract, per project, or per year). A handful of states sit on tier boundaries — Delaware (registration vs. none), Maryland (home improvement is licensed, but building a new home requires only registration with the Home Builder Registration Unit), North Dakota (the state calls its over-$4,000 requirement a license, but with no competency exam we treat it as registration), and Oregon/Washington (registration systems that function much like licensing); these are noted in the data. Two upcoming changes are not yet scored: Maine introduces a license requirement in 2027, and New Jersey is phasing in a licensing law for home-improvement contractors (new-home builders there still register). Always confirm current rules with your state board and local building department before relying on them.

Questions or a correction? Email hello@statedataindex.com.