Free guide

How to read a Long Island building permit

Building-permit sites are written for contractors and clerks. This guide is for everyone else. Use it alongside the Monday newsletter.

1. Application vs issued vs CO

Application / filed means someone asked the town for permission. Nothing may happen yet. Issued / approved means the town said yes (often with conditions). Certificate of Occupancy (CO) or Certificate of Compliance means the work was inspected and closed out. A flood of applications without COs is a backlog, not a boom.

2. Teardowns are a leading indicator

A demolition permit on a residential lot often means a larger rebuild or a lot flip is coming. It is public record. It is not a rumor on Nextdoor.

3. What the address tells you

Street + neighborhood matter more than the dollar amount (which towns often omit or redact). Cluster of filings on one road = local construction traffic for months.

4. Commercial vs residential

Retail, office, and multi-family filings change traffic and tax base. Residential additions (decks, pools, solar) dominate volume but rarely change a neighborhood's character overnight.

5. Where to look it up yourself

6. What we will never do

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