A building permit timeline runs from the day you start preparing drawings to the day the final inspection passes. The part most people mean, from submission to issued permit, can be anything from same-day for a simple trade permit to several months for an addition in a busy city. Where your project lands depends on its size, the office’s workload, and above all how complete the application is when you submit it.
Quick answer: Simple permits, such as a water heater, fence or small deck, are often issued same-day to two weeks. Projects with full plan review, such as additions, garages, ADUs and pools, usually take a few weeks to a few months. Each round of corrections adds time, so a complete, clear first submission is the biggest factor you control.
The stages of a building permit timeline
| Stage | What happens | What drives the time |
|---|---|---|
| Research and design | Rules checked, project designed | Your decisions, HOA approvals |
| Drawings | Site plan and other sheets prepared | Project size, information available |
| Intake | Office checks the application is complete | Missing items cause rejection at the counter |
| Plan review | Building and zoning review | Workload, number of disciplines |
| Corrections | You revise and resubmit | Speed and quality of your response |
| Issuance | Fees paid, permit printed | Usually quick |
| Inspections | At each construction stage | Scheduling availability, readiness |
Typical timelines by project type
Treat these as broad ranges, not promises. Busy cities can be much slower, and small rural offices can be faster.
- Trade permits (water heater, circuit, HVAC swap): often same day to a few days, sometimes online.
- Fence or zoning-only permit: often days to two weeks.
- Shed or small deck: often one to three weeks.
- Pool: often a few weeks, longer with HOA or flood-zone review.
- Garage or addition: often several weeks to a couple of months.
- ADU: varies widely; some states set review deadlines for ADUs, others don’t.
Many departments publish current average review times on their website, which is the most reliable figure for your area. For an overview of which projects need a permit at all, see our pillar guide Do I need a building permit?
Why corrections matter most
Each correction round restarts part of the clock: you revise and resubmit, then wait for the reviewer to come back to your file. Two or three rounds can double a timeline. Most corrections are predictable: missing setbacks on the site plan, no scale, a missing structural detail, inconsistent dimensions or an unclear description. Our guide on why building permits get rejected lists the patterns to check before you submit.
How to shorten your building permit timeline
- Read the submittal checklist and follow it exactly.
- Confirm zoning rules before drawing, so the design doesn’t need to change.
- Submit a clear, scaled site plan with dimensions to every lot line.
- Make every sheet agree: the same dimensions, project description and address.
- Include structural details for decks, beams and foundations.
- Get HOA approval in parallel, not afterwards.
- Respond to comments quickly and completely, with a response letter that answers each one.
- Ask whether the office offers express review for simple projects.
Waiting for inspections
Once the permit is issued, inspections pace the build. Many departments schedule next-day or within a few days; busy ones take longer. Failed inspections add a re-inspection and sometimes a fee. Being ready, with work exposed, approved plans on site and access arranged, avoids most failures.
Timelines for drawings
Drawings are often the stage owners underestimate. A site plan can be drafted quickly when the lot information is available, while a full set for an addition involves measuring, design decisions and coordination with an engineer. Having your plat or survey, photos and measurements ready speeds this up. Our how it works page explains what we need to start.
Permit expiration and timing
Permits also have deadlines on your side. Many expire if work doesn’t start within a set period, or if more than a set period passes between inspections, often 180 days. If your project will take time to start, ask about extensions before the permit lapses rather than after.
Planning your project schedule around the permit
For seasonal work such as pools, decks and outdoor projects, submit well before the season you want to build in, because spring is often the busiest period. For contractors, include permit time in the schedule you give clients. And remember HOA review, which may have its own monthly meeting cycle, sometimes needs to come before the permit.
Projects that involve more than one agency
Some projects need sign-off from offices beyond the building department, and each adds its own clock. Common examples are the health department for properties on septic, the public works or roads department for new driveway connections, the floodplain administrator for flood-zone lots, a historic preservation commission, and the HOA. Where possible, contact them at the start and run their reviews in parallel, rather than discovering them halfway through plan review.
What to do if your permit seems stuck
Check the portal for status and comments, as some offices post comments without emailing. If the review is past the published average, contact the permit technician politely with your permit number and ask whether anything is needed from you. Avoid resubmitting the whole application unless asked, which can restart the queue.
Frequently asked questions
How long does a building permit take?
From same day for simple trade permits to weeks or months for additions and ADUs, depending on the office and how complete your application is.
Why is my permit taking so long?
Usually because of reviewer workload, multiple review disciplines, or waiting for corrections. Check the portal for comments.
Can I pay to speed up a permit?
Some offices offer expedited or third-party review for an extra fee. Many don’t.
Can I start work while waiting for the permit?
No. Starting before the permit is issued is treated as work without a permit.
How long is a building permit valid?
It varies; many expire if work doesn’t start or stops for around 180 days. Check your local rules.
