How Long Is a Building Permit Valid? 20 Major US Cities Compared

"How long is a building permit valid?" has no national answer. Every city and county sets its own rules. But after researching the actual building codes and permit documents of the 20 largest U.S. metros, a clear picture emerges — and it's more consistent than most contractors expect.

Below is the comparison table, built from verified municipal sources. Where we could not verify a city's rules from an official source, we say so plainly rather than guessing.

The 20-City Comparison Table

Reading the Table: The Two Clocks

Nearly every city in the table runs its permits on the same two clocks — they just set the dials differently:

Clock 1: Commencement. Work must begin within a set window after issuance. Chicago gives 180 days from payment to begin work and request the first inspection. San Diego voids the permit if work hasn't begun within 180 days. Miss this window and the permit lapses before a single inspection happens.

Clock 2: Progress (abandonment). Once started, work must keep showing progress — and "progress" almost always means inspection activity. Ten of the twenty cities use a flat 180-day abandonment rule: 180 days with no inspection, and the permit is void. Austin's version is precise: the permit expires on the 181st day if no inspection was scheduled or received — but a passing inspection extends expiration another 180 days.

A few cities add a third element — an overall duration cap regardless of progress. New York caps permits at two years from issuance. Philadelphia caps construction and demolition permits at five years. Seattle's 18-month permits can be renewed for another 18 months from the prior expiration.

The 180-Day Majority

Count the table and the pattern is unmistakable: ten of the twenty cities run on 180 days. Los Angeles, Chicago, Phoenix, Philadelphia, San Antonio, Austin, Jacksonville, Fort Worth, Charlotte, and San Francisco all use the 180-day standard for inactivity or abandonment.

This isn't coincidence. Most U.S. building codes descend from the same model-code language, and the 180-day abandonment provision is one of the most widely adopted sections. The practical consequence: if you work in multiple cities and only remember one number, 180 days is the one — but always confirm, because the cities that differ (New York's 730, Seattle's 540, San Diego's 365) differ substantially.

The Long-Window Cities

Three cities stand out for generosity:

• New York (730 days): two full years from issuance, though work must commence within 12 months and the permit expires if work lapses 12 months. Renewal costs $130 and should be filed about two weeks before expiration.
• Houston (730 days): two years, but with a hard 180-day inactivity tripwire — the permit goes invalid on the 180th day without commencement and inspection, even inside the two-year window.
• Seattle (540 days): 18 months from issuance, renewable for another 18 months from the prior expiration — and permits expired less than a year can be reestablished rather than reapplied, one of the more forgiving policies in the table.

Longer windows are not looser rules. Houston's two years still die at 180 inactive days. The window is longer; the heartbeat underneath is the same.

Extension Policies Worth Knowing

Extensions are where the cities diverge most:

• Chicago is the most structured: up to two 180-day extensions before construction, up to four 180-day extensions after work starts, with a cumulative 720-day maximum.
• San Jose offers a two-tier system: an approved first extension adds 180 days; a second extension, up to 360 days, requires a letter to the Chief Building Official and is discretionary.
• San Francisco requires the extension request before expiration via a service request form; a second extension needs a letter to the Chief Building Inspector.
• Philadelphia draws the hardest line in the table: once a permit has actually expired, there is no renewal — you need a new permit application.
• Seattle is the most forgiving after the fact: permits expired less than a year can be reestablished; only permits expired a year or more require starting over.

The universal advice across all twenty: request extensions before expiration, not after. Pre-expiration extensions are routine administrative actions in nearly every city. Post-expiration recovery is discretionary, slower, and sometimes impossible.

Where the Data Isn't Available

Four cities in the table show "varies — not verified": Dallas, Denver, and Oklahoma City, where we could not confirm validity rules from official municipal sources, and Indianapolis, where only the existence of an extension form could be verified. Three more — Los Angeles, Jacksonville, and Charlotte — have verified validity periods but unverified extension processes.

This isn't a gap in the table; it's the honest state of public permit data. Many building departments publish validity rules deep inside PDFs, council packets, or newsletter archives rather than on clean web pages. When a city's rules aren't published clearly, call the permits division directly — and get the answer in writing.

Frequently Asked Questions

Why do so many cities use 180 days?

Most U.S. building codes are based on shared model-code language, and the 180-day abandonment provision is one of its most widely adopted sections. Cities then amend it locally — which is why the headline number matches but the details (extensions, caps, exceptions) differ.

Does a passed inspection reset the 180-day clock?

In most 180-day jurisdictions, yes — a passed inspection is the primary evidence of progress and restarts the abandonment window. Austin states this explicitly: a passing inspection extends expiration 180 days. But confirm with your specific AHJ, because a few jurisdictions run expiration from the issue date regardless.

Which city gives contractors the most time?

Of the verified cities, New York and Houston offer the longest headline windows at two years each — though both still enforce 180-day activity requirements inside that window. Seattle's 18 months with straightforward renewal is arguably the most practical long window.

Can I rely on this table instead of checking with the city?

No. Use it as a starting point, then verify with the issuing building department. Codes are amended, policies change administratively, and special permit types (demolition, phased, trade permits) often carry different terms. The table tells you what to ask about; the AHJ gives you the binding answer.

What should I do with these dates once I know them?

Log every permit's validity terms the day it's issued — issue date, commencement deadline, abandonment rule, overall cap — and set reminders ahead of each one. A permit's validity is only useful information if someone is watching it.

Track Every City's Deadlines in One Place

Twenty cities, twenty rulebooks, and that's just the building permit — trade permits, licenses, and inspections each carry their own clocks. No contractor tracks all of that reliably from memory.

Permit Warden does it for you: every permit logged with its jurisdiction's validity terms, automatic reminders before any deadline, and one dashboard across every city you work in. Free to start.