How Long Does a Building Permit Take? Realistic Timelines

The short answer: it varies — a lot

There is no single number for how long a building permit takes, because the range is enormous. The same project can be approved in a day in one city and take three months in another, depending on staffing, backlog, and local process. Anyone who quotes you a universal figure is guessing.

What you can do is understand the bands. Minor work that qualifies for over-the-counter or express review is often issued immediately or within a few days. Standard residential projects typically take a few weeks. Larger or more complex projects — and anything requiring discretionary review or multiple correction cycles — can run one to several months. The rest of this guide breaks those bands down and explains what moves you within them.

Typical timelines by project type

For small, well-defined work — a water heater, a re-roof, a simple electrical job — many jurisdictions offer same-day or over-the-counter permits with little or no plan review. For standard residential projects like additions, remodels, or a straightforward ADU, expect roughly a few weeks to a couple of months from submission to issuance, assuming the plans are complete.

Larger, more complex, or discretionary projects take longer — often several months — especially if they require multiple departments to sign off or go through hearings. ADUs specifically vary widely: jurisdictions with streamlined or ministerial review move much faster than those applying full discretionary review. Our ADU permit guide covers that process in more detail.

Keep in mind that the clock often pauses while the application sits with you. Many departments measure their turnaround only for the time a submittal is actively in their queue, so the calendar time you actually experience depends heavily on how fast you turn around each round of comments. A project that could clear review in three weeks of department time can easily stretch to three months if corrections sit on your desk between cycles.

What drives delays

Most permit delays come from a handful of predictable sources. The biggest is plan review corrections: when reviewers find code issues, they return the plans with comments, and each round of fixing and resubmitting adds time. Incomplete or low-quality submittals are the number-one cause of extra cycles.

Other common delays include departmental backlog and staffing (busy seasons and short-staffed offices slow everything), projects that require sign-off from multiple agencies (fire, health, public works, utilities), and discretionary review or public hearings where they apply. External requirements — like environmental review or special-district approvals — can add time outside the building department's control. Seasonality matters too: permit volume tends to surge in spring and summer, stretching review times exactly when departments are busiest. Knowing which of these applies to your project helps you set a realistic schedule.

How to get your permit faster

You cannot control a jurisdiction's backlog, but you control the single biggest lever: the quality of your submittal. Complete, code-compliant, clearly drawn plans with all required documentation sail through review with fewer correction cycles — and each cycle you avoid can save weeks. When comments do come back, respond quickly and completely rather than piecemeal.

Other practical moves: ask the building department about over-the-counter or express options for qualifying work, pre-check whether your project triggers other agency reviews so you can start those in parallel, and consider a pre-submittal meeting for complex projects. A licensed design professional who knows the local department's expectations can dramatically reduce back-and-forth. The goal is to give reviewers nothing to send back.

Researching timelines in your market

Because timelines are so jurisdiction-specific, the most useful thing you can do is look at real activity where you build. Permit records show what is being filed and issued locally, which gives you a feel for how a given department handles projects like yours.

You can explore recent permit activity with our permit lookup tool, which draws on live data from official open-data portals across 65 cities in 37 US states. For contractors and developers who want a normalized, sub-24-hour feed of permit activity to plan pipelines and outreach around, request access to Igni. (General information only — confirm actual processing times with your local building department.)

Frequently asked questions