Demolition Permits: What You Need Before You Tear Anything Down

Demolition sits in an odd spot in the permit system. Most homeowners assume the permit is a formality, a form you file on the way to booking an excavator. In practice the permit is the last thing that happens, not the first, and cities put several unrelated requirements in front of it.

The permit fee itself is small, usually between $75 and $150 for a house. What costs time and money is the sequence of things the city makes you finish before it will issue one: a separate plumbing permit to cap the sewer, an asbestos survey, disconnect confirmations from three or four utilities, and in some cities a waiting period measured in weeks.

This article covers which structures need a demolition permit, what has to be done before you apply, what the whole thing costs, and the zoning trap that catches people who plan to rebuild on the same footprint.

What Actually Needs a Demolition Permit

The cleanest statement of the rule comes from Portland, which requires a demolition permit for any structure that needed a permit to be built, including structures that were built without one.

That test is easy to apply. A house needs a permit. A detached garage needs a permit. A large shed over the size threshold needed one. A small shed under 200 square feet usually did not, so it usually does not need one to come down.

Two details surprise people:

• Each structure is its own permit. Portland does not bundle them. Demolishing a house and its detached garage in the same project means two separate demolition permits.
• Partial demolition counts. Removing a wing, a porch, or a section of roof structure is still demolition in most codes, even though the building stays standing.

If the structure went up without a permit in the first place, you still need a demolition permit to take it down, and the department will notice the discrepancy. That is worth thinking about before you file, because in some situations legalizing the work is cheaper than removing it. Our guide to retroactive permits covers when that route is open.

The Disconnects Come Before the Permit, Not After

This is the sequencing detail that derails schedules. You cannot apply for the demolition permit and sort the utilities out afterward. In most cities the disconnects are prerequisites to issuance, and at least one of them requires its own permit.

Houston is the clearest example. A licensed Texas master plumber, registered with the City of Houston, has to purchase a plumbing permit to disconnect all sewer and water supply lines serving the structure. That disconnect has to be inspected and approved before the demolition permit application goes in. So the first thing you do is hire a plumber, and the plumber's permit has its own review and inspection cycle.

Portland handles the same problem differently but with the same effect: if the house is on the city sewer, capping the sewer is part of the demolition permit. A house on a septic system or cesspool needs a separate decommissioning permit through Multnomah County.

Four disconnects are typical, and they run on different clocks:

• Sewer. Capped by a licensed plumber, usually under a separate permit, and inspected.
• Water. Shut off and often physically disconnected at the main by the water utility.
• Gas. Disconnected by the gas utility, which schedules on its own timeline.
• Electric. Disconnected and the meter pulled by the power company.

The gas and electric disconnects are the ones that stretch a schedule, because you are waiting on a utility company rather than on the city. Start those calls before you do anything else.

The Asbestos Rule, and Who It Actually Covers

There is widespread confusion here, and the confusion runs in both directions. People assume the federal asbestos rule applies to their house when it usually does not, then assume that means no survey is needed when their city requires one anyway.

The federal rule is the asbestos NESHAP, part of the Clean Air Act, at 40 CFR Part 61 Subpart M. It applies to demolition of a "facility," and the regulation defines that term to cover institutional, commercial, public, industrial, and residential structures, "but excluding residential buildings having four or fewer dwelling units."

So a standard single-family teardown generally sits outside the federal rule. Two things narrow that:

1. The exclusion depends on context, not just building type. The EPA does not treat houses demolished as part of a commercial or public project as exempt. A house coming down for a road widening, a subdivision, or a commercial development is covered even though it is a single-family home.
2. Where the rule does apply, it has teeth. It requires a thorough inspection of the affected facility for asbestos before demolition begins, and written notice to the delegated agency at least 10 working days before work starts.

Now the part that matters more for most readers: the federal exemption does not decide whether your city requires a survey. Portland requires a pre-demolition asbestos survey, and it will not issue the permit until the survey, the Site Controls Form, and an abatement close-out letter are all submitted. Oregon's Department of Environmental Quality has its own notification requirements on top.

The practical rule is to assume a survey is required until your building department says otherwise. A survey on a small house is a few hundred dollars. Abatement, if the survey comes back positive, is the item that can genuinely change your project budget, and it has to happen before demolition rather than during it.

The Waiting Periods Nobody Budgets For

Demolition is one of the few permits where a city may deliberately make you wait, and the reason is that neighbors object to teardowns.

Portland applies a 35-day demolition delay to one- and two-family dwellings in residential zones. Alongside it:

• The city mails notice to properties within 150 feet within five business days of the application.
• The applicant hangs door hangers on properties within 300 feet, between two weeks and 72 hours before work begins.

Historic districts add another layer. A structure inside a local historic district, or one old enough to be considered a contributing resource, may need review by a preservation commission before demolition is approved, and those bodies meet on monthly schedules.

None of this is difficult. It is just slow, and it is invisible until you are in it. If your project depends on the site being clear by a certain date, work backward from the disconnects and the delay period, not from the demolition itself.

What the City Wants to See on Paper

A demolition application is lighter on drawings than a construction permit, but it is not nothing. Expect to provide:

• A site plan showing the structure coming down, what stays, and the property lines.
• Tree information. Portland requires the size, location, and species of all trees 12 inches or larger in diameter, and requires you to preserve all trees 20 inches or larger plus one third of trees 12 inches or larger, or pay into the city's Tree Mitigation Fund.
• An erosion control plan. Simple sites use a basic form. Sites with slopes of 10 percent or more need a full plan, and an inspection before ground is disturbed.
• Structural plans when the demolition is adjacent to a sidewalk or another building.

The site plan is the document doing the most work here, because it is what the reviewer uses to confirm which structure is being removed and what the lot looks like afterward. If you do not have a current one, we draw permit-ready site plans from your parcel data.

What It Costs

The permit fee is the most predictable number in the project, and it is small. Three cities, read from their published fee schedules:

What sits around the permit is where the money goes:

• The plumbing permit for the sewer disconnect, plus the plumber's labor.
• The asbestos survey, and abatement if it comes back positive.
• Utility disconnect charges, which vary by provider.
• The demolition itself and disposal, which is the largest line by a wide margin and depends on the size of the structure, what it is made of, access for equipment, and local landfill rates.
• Erosion control and tree mitigation, where required.

We track permit fees rather than contractor pricing, so treat the demolition and disposal line as something to get local bids on. The useful thing to know going in is that the permit is rarely the constraint. The disconnects, the survey, and the waiting period are.

Taking Down a Detached Garage or Shed

Most readers here are not demolishing a house. They are removing a detached garage or an old shed to make room for something else, and the rules scale down.

A detached garage almost always needs a demolition permit, because it needed a building permit to go up. If it has power running to it, and most do, the electrical disconnect has to be handled by the utility or a licensed electrician before demolition.

A shed under the local building permit threshold, commonly 200 square feet, usually needs no demolition permit. Two things to check anyway: whether utilities were ever run to it, and whether your city ties demolition to its zoning code rather than its building code, which changes which department you deal with. That distinction is the subject of our guide to zoning permits versus building permits.

The Trap If You Plan to Rebuild

This is the part worth reading twice, because it is the one that cannot be fixed after the fact.

Older structures often sit closer to a property line than current zoning would allow. That is normal, and it is usually legal: the structure predates the current setbacks and is protected as a legal nonconforming structure. It can stay, and it can generally be repaired.

In many zoning codes, that protection ends when the structure is voluntarily demolished. Once it is gone, the replacement has to meet today's setbacks, and today's setbacks may not permit a building where the old one stood. A garage that sat two feet off the rear line for 60 years may have to be rebuilt at five or seven feet, which can mean a smaller building or a different footprint entirely.

Ask your zoning department this specific question before demolition: if I remove this structure, what setbacks apply to its replacement? Get the answer in writing. If the answer is unfavorable, the alternatives, which are renovation in place, partial demolition that keeps the nonconforming status, or a variance, all remain open only while the structure is still standing.

Our guide to how close to the property line you can build covers how setbacks are measured and where to find yours.

The Bottom Line

If it needed a permit to go up, it needs one to come down, and each structure counts separately. The permit is cheap and the review is usually fast, but it sits at the end of a chain: plumber and sewer disconnect first, utilities next, asbestos survey alongside, then the application, then in some cities a month of waiting before anyone touches the building.

Two calls will tell you most of what you need. Ask your building department whether an asbestos survey is required and what the waiting period is. Ask your zoning department what setbacks apply to a replacement structure. Everything else follows from those answers.