Final Inspection: What’s Checked, How to Prepare, and the CO

A final inspection is the last code review a local building official performs on a construction project before anyone can legally move in. Under the model building codes used across most of the United States, no building or structure may be occupied until that inspection is passed and the building official issues a Certificate of Occupancy.¹ Until the inspector signs off, the project is legally unfinished, no matter how move-in-ready it looks.

What the Inspector Checks

The inspector works from your approved plans and compares what’s on paper to what’s built. Discrepancies between the two are the fastest way to a correction notice, even when the actual workmanship is sound. If a room ended up with fewer outlets than the plans show, a handrail sits at the wrong height, or a bedroom window doesn’t meet the egress spec it was permitted under, those count against you.

Beyond matching the plans, the inspector walks the finished systems and the site:

Structural stability of walls, roof assemblies, and foundation elements against the permitted design.
Electrical: outlets tested for proper grounding, main service panel checked for correct circuit labeling, GFCI protection present in wet areas.
Plumbing: visible supply lines and drains checked for leaks, water pressure verified, fixtures connected.
HVAC equipment operated to confirm heating and cooling run safely and vent properly.
Site grading sloped away from the foundation.

Smoke Alarms and Carbon Monoxide Detectors

Alarm placement is one of the items inspectors scrutinize most closely. The residential code requires smoke alarms inside every sleeping room, outside each sleeping area, and on every story including basements.² Alarms must also sit at least three feet from any bathroom door that opens to a tub or shower. Carbon monoxide detectors follow a similar pattern and are required where there are fuel-burning appliances or an attached garage. Missing or misplaced alarms are among the most common failures, and also among the quickest to fix.

Egress

Every bedroom needs an emergency escape opening, usually a window, that opens from the inside without keys, tools, or special knowledge. The inspector confirms the opening meets minimum size requirements and actually operates. Exterior egress doors get checked for swing direction and hardware. Even small deviations from what the plans show will trigger a correction.

Site Grading and Drainage

Outside, the inspector confirms the ground falls away from the foundation. The residential code requires the grade to drop at least six inches within the first ten feet of the foundation wall. Where lot lines or slopes make that impossible, swales, French drains, or other alternatives must be in place. Impervious surfaces like patios and driveways within ten feet of the foundation need at least a two percent slope away from the building.³ Poor grading is a common failure point, often because landscaping crews finish grade without coordinating with the general contractor.

Commercial and Multifamily Projects

If you’re closing out a commercial building or multifamily housing, the inspection also covers the 2010 ADA Standards for Accessible Design: accessible route widths and slopes, parking space and access aisle dimensions, signage height, door clear widths, and the force required to open interior doors.⁴ These are measured with instruments, not estimated, so being close isn’t good enough.

How to Prepare

The single most useful thing you can do before calling for a final is walk the building yourself with a copy of the approved plans and compare room by room. Catch your own discrepancies first. Beyond that, a handful of basics make the difference between a smooth visit and a wasted trip.

Keep the approved plans and the permit on site and accessible. If they’re locked in a trailer no one can open, the inspector may not proceed.
Confirm every earlier inspection in the permit history shows a passing result. The final can’t be scheduled until the rough-ins for electrical, plumbing, mechanical, and framing are all closed out.
Post address numbers visible from the street, at least four inches tall, in a contrasting color. This gets overlooked constantly on new construction.
Clear construction debris out of crawl spaces and attics. The inspector needs access and will note leftover materials as a violation.
Make sure the work is actually finished. Missing outlet covers, unpainted fire-rated assemblies, and plumbing fixtures that aren’t connected all fail. If it’s not done, don’t call for the final.

Scheduling and the Visit

Most jurisdictions let you schedule through an online portal or a dedicated phone line. You’ll typically need the permit number, the property address, and often the contractor’s license number. Expect to give 24 to 48 hours of notice, though busier departments stretch longer.

The inspector walks the whole property, including attics, crawl spaces, and mechanical rooms. A typical single-family home takes roughly 30 to 90 minutes depending on size and complexity. Commercial buildings take longer. Results usually come on the spot or through a digital notification the same day. A pass leaves you with a physical approval tag or an updated electronic permit record. A failure comes with a correction notice listing the specific violations.

Why Projects Fail

Building departments see the same issues again and again:

Deviations from the approved plans. This is the top cause of failures. If changes happened during construction, they should have gone through a plan revision before the final.
Smoke alarms missing from a bedroom, placed too close to a bathroom, or absent from a required story.²
Final grading that directs water toward the building rather than away from it, violating the six-inch-in-ten-feet rule.³
Electrical deficiencies: faulty wiring, missing GFCI protection, mislabeled panels.
Plumbing leaks, including small drips at supply connections or drain fittings.
Egress problems: windows painted shut, escape windows that require tools, exit doors with the wrong hardware.

What Happens If You Fail

A failure isn’t catastrophic, but it costs time and money. The inspector issues a correction notice spelling out exactly what needs to be fixed. You address those items and schedule a re-inspection. Most jurisdictions charge a separate fee for re-inspections, commonly between $50 and $150, though some include the first one at no additional charge. The re-inspection focuses on the failed items rather than re-examining the entire building.

Where things get expensive is when a failure exposes deeper problems. Foundation cracks from soil settling, framing that doesn’t match the engineering, or fire-rated assemblies installed incorrectly can require opening up finished walls. That turns a minor re-inspection into a major rework, with additional trade inspections before you can call for the final again.

The Certificate of Occupancy

Passing the final leads to the issuance of a Certificate of Occupancy (CO). The model building code is explicit: a building cannot be used or occupied, and no change of occupancy can take place, until the building official issues this certificate.¹ The CO confirms the structure is safe and complies with the applicable codes and local ordinances. It formally closes the building permit.

The local building department usually makes the CO available by mail or digital download once outstanding fees are paid. Keep it permanently. Future sales, insurance claims, and refinancing often require it as proof of code compliance. Replacing a lost CO is possible through the issuing department, but it’s a hassle you don’t want surfacing during a closing.

Temporary Certificates

When a project is substantially complete but has minor unfinished items, many jurisdictions offer a Temporary Certificate of Occupancy (TCO). The building code authorizes the official to issue a TCO before all permitted work is done, provided the portions to be occupied can be used safely.⁵ All fire protection systems, egress components, and essential safety features must be fully operational first.

The building official sets the TCO’s validity period, commonly 30 to 90 days depending on the jurisdiction. Some departments allow a renewal if you can show progress on the remaining items, often with additional fees. A TCO is not a permanent solution. If the outstanding work isn’t completed and inspected before it expires, you may face fines or be required to vacate until a full CO is issued.

Occupying Without Passing

Moving in without a CO exposes you to compounding problems. Local governments can issue repeated fines, and some pursue legal action against owners who occupy unpermitted or uninspected buildings. In certain jurisdictions, utilities cannot be connected to a building until the final is passed, meaning no permanent electrical or gas service.

The financial fallout runs further. Most lenders require a CO before funding a mortgage or releasing the final construction loan draw. If you try to sell a property that never received one, the buyer’s lender will almost certainly flag it and the sale will stall. Tenants who discover their building lacks a CO may have grounds to break their lease and potentially recover damages. Insurers may limit or deny coverage on structures that were never formally cleared for occupancy.

Building permits also expire, commonly between six months and one year from issuance depending on the jurisdiction. Delay the final past that date and you’ll need to apply for a renewal, pay additional fees, and potentially bring the project into compliance with any code changes adopted since the original permit. That last piece is the real risk, because renewal under updated codes can trigger retrofits that wouldn’t have been required otherwise.

1
UpCodes. IRC R110.1 Use and Change of Occupancy
2
ICC Digital Codes. 2018 International Residential Code (IRC) – R314.3 Location
3
ICC Digital Codes. 2024 International Residential Code (IRC) – R401.3 Drainage
4
U.S. Department of Justice. 2010 ADA Standards for Accessible Design
5
ICC Digital Codes. 2021 International Building Code (IBC) – Section 111.3 Temporary Occupancy