How Long Does a Building Permit Last?

How Long Is a Building Permit Valid?

A building permit has two clocks running, and either one can end it.

The first clock is the start deadline. If you do not begin authorized work within a set period after the permit is issued, it becomes invalid. The second clock is the activity deadline. Once work has started, the permit stays alive only if you keep making progress. Let the job sit idle too long and the permit expires even though you already broke ground.

Both clocks trace back to a model code that most US jurisdictions adopt in some form. Under the International Residential Code (IRC) and International Building Code (IBC), a permit becomes invalid if work does not commence within 180 days of issuance, or if work is suspended or abandoned for 180 days after it starts. Many cities and counties adopt those numbers word for word. Others stretch the start window to 12 months while keeping the 180-day idle limit, and some replace the whole framework with a flat one or two year term to complete the project. For the wider context on how these codes shape every permit, see our guide to what a building permit is.

A few real patterns show how much this varies:

• Some jurisdictions follow the classic 180-day start and 180-day idle standard straight from the model code.
• Others give you 12 months to begin work, then expire the permit after any 180-day gap in approved inspections.
• Some set a fixed one-year term measured from issuance, with the first inspection required inside 180 days to keep the full term alive.
• California sets a 12-month start window statewide: under state law a permit stays valid if work begins within 12 months of issuance, unless the work is abandoned. Local building departments still define what counts as abandonment and set their own progress rules on top.

The practical takeaway: never assume your timeline from a blog or a neighbor's experience. Read the expiration language printed on your permit, or call the building department and ask two questions. How long do I have to start? And how long can the job sit between inspections?

What Makes a Building Permit Expire?

Permits rarely expire because someone forgets a renewal form. They expire because the project stalled and the clock ran out. The usual triggers are:

• No work started in time. The start window closes and the permit goes void before a single inspection happens.
• A long gap between inspections. This is the most common cause for active projects. Inspections are how the building department measures progress. A permit is treated as suspended or abandoned once that gap passes the limit, usually 180 days, even if you were quietly working the whole time.
• A contractor change mid-project. When a new contractor takes over and nobody tracks the original deadlines, permits slip through the cracks. A permit expediter is one way larger or multi-trade projects keep these dates from being missed.
• The project simply paused. Funding dries up, weather hits, a dispute drags on, and the idle clock keeps ticking.

The key thing to understand is that "progress" usually means inspections passed, not effort spent. A jurisdiction cannot see your work; it sees its inspection record. Keeping that record current is what keeps a permit alive.

What Happens If Your Building Permit Expires?

If your permit lapses, stop work. Continuing to build under an expired permit is treated as working without a permit at all, and the consequences are real:

• Fines and penalties. Local governments can charge significant amounts for work done under a lapsed or missing permit.
• Stop-work orders. An inspector can legally halt the entire job site until the permit situation is resolved.
• A blocked certificate of occupancy. Without a closed-out permit, you may not be able to legally occupy or use the finished space.
• Insurance exposure. If a fire or other loss is tied to unpermitted work, an insurer may deny the claim.
• Trouble at resale. Title searches surface permit history. An open or expired permit can delay closing, reduce offers, or hand the problem to the buyer.

These are the same penalties that apply to skipping a permit in the first place. We cover them in depth in what happens if you build without a permit. None of this means panic. It means do not keep building, and resolve the permit before you do anything else.

How to Renew or Reinstate an Expired Building Permit

In many jurisdictions an expired permit can be brought back to life rather than started from scratch. The process generally looks like this:

1. Confirm the current status. Call or check online to learn whether the permit is expired, how long it has been expired, and whether reinstatement or a new permit is required.
2. Gather your documentation. Pull the original permit number, approved plans, and your inspection history.
3. Request reinstatement or an extension. If the lapse is recent and your plans have not changed, most building departments will reinstate the permit for a reduced fee. A common figure is half the original permit fee when the work has been suspended for less than a year.
4. Schedule outstanding inspections. Get the project back on the inspection record to restart the activity clock.
5. Apply for a new permit if reinstatement is denied. If the suspension exceeded a year, or the building code has changed since issuance, you may need a fresh permit at full fee and plans that meet the current code. Our step-by-step guide to applying for a building permit walks through that from the start.

Extensions are worth knowing about too. Many jurisdictions let you request one or more extensions, often 180 days each, but you usually have to ask in writing before the permit expires and show a legitimate reason for the delay. Once it has already lapsed, your options narrow, so the cheapest move is always to extend before the deadline rather than reinstate after it.

How Permit Costs Change After Expiration

Reinstatement and renewal fees follow a rough pattern across jurisdictions, though the exact numbers are local:

• Suspended under one year, no plan changes: expect to pay around half the original permit fee to reinstate.
• Suspended over one year: you may pay the full permit fee again, as if applying new.
• Code edition changed since issuance: even a reinstated permit may require your plans to be updated to the current code, which can add design and review costs.

Always confirm the fee schedule with your building department, since these are estimates and local rules govern.

How Long Do Different Permits Last?

The two-clock rule applies across project types, but the smaller and simpler the job, the more likely you are to start and finish well inside the window. A few examples homeowners ask about:

• Decks. A typical residential deck permit follows the standard 6 to 12 month window. Most decks are built in a single season, so expiration is rarely an issue unless the project stalls. See our deck permit guide for the requirements that come first.
• Fences. Fence permits, where required, are usually short-scope and quick to close out. The risk is forgetting the final inspection rather than running out of time. Details are in our fence permit guide.
• Sheds. A shed permit follows the same clock, and because the build is fast, the activity deadline almost never bites. Our shed permit guide covers when a permit is needed at all.
• Patios. Patio and patio-cover permits are straightforward, but attached covers tie into the house and sometimes need an inspection sequence. See the patio permit guide.
• Garages. A detached or attached garage is a larger build, so it is the most likely of these to brush against the activity deadline if framing or inspections stall. Our garage permit guide explains the process.

Larger or multi-trade projects, like a whole addition with separate electrical, plumbing, and mechanical permits, are where expiration is most likely. Each permit has its own clock, and it only takes one stalled trade to put the project at risk.

Open and Expired Permits When Selling a Home

This is where permit timing quietly causes the most expensive surprises, so it deserves its own section.

An open permit is one that was issued but never closed with a final inspection. An expired permit has passed its deadline without being finalized. Either one stays attached to the property, not the person who pulled it. When you sell, a title search will typically reveal them, and unresolved permits can stall closing, trigger buyer credits, or even give a buyer grounds to walk away.

Because the permit follows the property, the new owner can inherit the obligation to close it, including any fines, missed inspections, or work that no longer meets code. That is why buyers and their agents increasingly request a permit search during due diligence, and why sellers are often expected to close open permits before closing day. If finalizing the permit would require opening walls or floors to inspect concealed work, the cost and disruption can be substantial.

If you are buying, ask for a permit search early. If you are selling, check your own property for open or expired permits well before you list, so you have time to close them out on your terms rather than under deal pressure.

How Permit Expiration Rules Differ by State

There is no national rule that fixes how long a building permit lasts. Each state adopts the IRC and IBC with its own amendments, and cities layer their own rules on top. The result is real variation in the expiration window.

California sets a 12-month start window statewide. Under state law, a permit stays valid if work begins within 12 months of issuance, unless the permittee abandons the work. The state also allows extensions of up to 180 days each, requested in writing with justifiable cause. What counts as abandonment, and any progress rules after work starts, are still set locally, so some counties that previously allowed multi-year terms shortened them to comply. Confirm your county's exact rule.

Massachusetts follows the model-code pattern closely: a permit becomes invalid if work does not commence within 180 days of issuance, or if work is suspended or abandoned for 180 days after starting.

Washington jurisdictions commonly use the 180-day start and 180-day idle rule, and many spell out a reinstatement fee of half the original permit cost when the lapse is under a year.

Texas has no mandatory statewide residential code, so expiration rules are set city by city. Large cities run full permit systems with defined expiration and extension rules, while some rural unincorporated areas have minimal requirements.

For the rules that apply to your specific city, start with your state guide below, then confirm the exact expiration and extension language with your local building department.