Permit Ledger blog

Building permit guides for contractors & suppliers

Practical, data-backed guides on building permits, permit records, and turning them into renovation, solar, and remodel leads, from the team behind Permit Ledger's free weekly insights across 338 US cities.

• What Is the AHJ (Authority Having Jurisdiction)?

  AHJ is the Authority Having Jurisdiction: the local office that enforces the building code, issues permits, and inspects work. What it is and how to find yours.

• What Is a Parcel Number? Definition and How to Find It

  A parcel number (APN or parcel ID) is the unique number a county assigns to a property for tax and records. What it is, how to find yours, and why it matters.

• Unpermitted Work: What Happens If You're Caught

  Unpermitted work is construction done without a permit or inspections. What counts, how it gets discovered, what happens if caught, and how to fix it.

• What Renovations Require a Building Permit? (2026)

  Structural, electrical, plumbing, and most exterior work needs a building permit; cosmetic work usually doesn't. A 2026 guide to which renovations require one.

• Are Building Permits Public Record? (2026 Guide)

  Yes, building permits are public record in all 50 states. What's included, what's redacted, how to access records for free, and how to get clean permit data.

• How to Find Building Permits Online (2026 Guide)

  Building permits are public records, but city portals are a mess. How to search permit databases, which data fields matter, and how to get clean data as a CSV.

• Building Permit Data for Contractors (Lead Source)

  Most renovation contractors overspend on ads and Angi. Building permit data pre-qualifies every lead before you make contact. How it works and why it converts.

• How to Get Renovation Leads: 7 Methods Ranked by ROI

  From Google Ads to building permit data, the most effective renovation lead generation methods for contractors, ranked by ROI with cost-per-lead estimates.

• What Data Is in a Building Permit? (Field Guide)

  Building permits hold more useful data than most contractors realize. A breakdown of every field in a typical permit, and which ones matter most for leads.

• How Roofing Contractors Use Permit Data to Win Jobs

  Roof replacement permits are publicly filed, and they arrive before a contractor is hired. The exact playbook roofers use to turn permit data into steady jobs.

• How to Find Building Permits by Zip Code (2025 Guide)

  How to search building permits by zip code using free city portals and filtered data services. Find active renovation projects in any US market, step by step.

• Building Permit Data for Lead Generation

  Building permits are the earliest signal of new project activity. How contractors and home service pros use permit data to find leads before competitors do.

• How to Look Up Building Permit History by Address

  How to find the complete building permit history for any US property. For homebuyers checking for unpermitted work, investors weighing risk, and contractors.

• Shovels vs BuildZoom vs Construction Monitor (2026)

  Comparing Shovels.ai, BuildZoom, and ConstructionMonitor side by side: coverage, pricing, use cases, and who each is built for. Plus where Permit Ledger fits.

• What Is a Building Permit? Definition & Types

  A building permit is official government authorization to begin construction. What permits cover, who needs them, common types, and how permit data gets used.

• The Best Cities for Renovation Permit Volume in 2026

  Ranked: the US cities with the highest residential renovation permit volume in 2026. Where contractors and investors should focus their permit-data marketing.

• Build a Direct Mail List from Building Permits

  Step-by-step: how to turn raw building-permit CSVs into a CASS-certified, suppression-checked direct mail list for contractor outreach in 2026.

• Building Permit Data for Solar Installers (Guide)

  How solar installers use building-permit data to find solar-ready roofs, target adoption clusters, and skip the $300+ paid-lead model. A practical playbook.

• How Investors Use Permit Data to Find Deals

  The investor's permit-data playbook: spotting active flippers, finding stalled or distressed renovation deals, and building a buyers list from public records.

• How to Get HVAC Leads from Building Permits

  How HVAC contractors use building-permit data for AC, furnace, and heat pump leads, adjacency mailing, warranty pitches, and competitor intelligence.

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