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How to Pass a Rough-In Electrical Inspection (Checklist + Top Fail Items)

By Brian WilliamsPublished August 3, 20267 min read

Before the drywall goes up, an inspector sees your wiring while it's exposed. Here's the checklist to run first, plus the items that fail people most.

I've spent a lot of years riding the engine here in Kansas City, and if there's one type of call that stays with a firefighter, it's the fire that started inside a wall. You pull the drywall and there it is, cooked wiring behind a room that looked perfectly normal an hour earlier. A good share of those trace back to electrical work that got rushed, hidden, or never looked at by anyone who knew what they were seeing.

That is the entire reason a rough-in inspection exists. It happens after your wiring, boxes, and cables are installed but before the walls get closed up with insulation and drywall, so the inspector can actually see the wiring. Once those walls close, nobody sees that work again until something goes wrong at two in the morning. So if you're doing a remodel, a basement finish, or an addition and you want to pass on the first try, this is the guide I'd hand you.

Quick Answer: To pass a rough-in electrical inspection, pull your permit first, then confirm every box is mounted at the right height and depth and fastened tight, cables are stapled and protected from nails with metal plates, wire gauge matches the breaker size, grounds and neutrals are separated in any sub-panel, GFCI and AFCI protection is in place where required, and breakers are labeled. Never cover any work before the inspector signs off.

What a rough-in inspection actually checks

The rough-in is the "bones" inspection. The inspector is not judging your finish work or your outlet covers, because none of that exists yet. They're looking at the stuff that gets buried: the cable runs, how boxes are secured, whether wire is protected where it passes through studs, your grounding and bonding, and whether the panel is wired correctly. The goal is simple. Everything that will soon be invisible needs to be right while it's still visible.

Make this easy on the person doing the inspection. Leave the panel cover off, leave junction boxes accessible, and don't stuff insulation in ahead of time. If they can't see it, they can't pass it.

Pull the permit before you touch a wire

The fastest way to fail is to not have a permit at all. In most places, the permit is what triggers the rough-in inspection in the first place, and doing electrical work without one can mean tearing open finished walls later to prove the hidden work was done right. That's a brutal, expensive lesson.

If you're not sure what your project requires, start with our overview of electrician permits and check the specific rules for your state before you buy a single box of wire. Panel and service work has its own requirements, and our panel upgrade code guide walks through what that involves.

The top items that fail a rough-in

I pulled these straight from a real building department's published list of why residential inspections get rejected (the City of Raleigh, NC), because I'd rather show you verified fail reasons than make some up. Three come up over and over.

Sub-panel grounds and neutrals not separated

This is a big one. In a sub-panel (a second panel fed from your main), the grounds and the neutrals must be kept separate, on isolated bars, and the bonding screw or strap that ties neutral to the enclosure has to be removed. Neutral and ground are only bonded together at your main service, at one single point. Get this wrong and you can put current on metal that should never be energized. Inspectors flag this constantly, and they're right to.

Missing GFCI or AFCI protection where required

GFCI protection guards against shock in wet or damp areas, and AFCI protection guards against the kind of arcing that starts fires. Your local code spells out which circuits and locations need each one, and the list has grown over the years. Missing or wrong protection is one of the most common rejection reasons there is. Check the current requirements for your area rather than assuming what was fine ten years ago still flies.

Breakers and circuits not labeled

Simple, and people skip it anyway. Every breaker in the panel needs to be clearly identified so anyone can tell what it feeds. An unlabeled or vaguely labeled panel is a documented fail item, and it's a safety issue too. When my crew has to kill power to a structure, a clear panel directory can save real time.

The rough-in checklist

Run this before you call for your inspection. Most first-try failures are just one of these getting missed.

Permit is active and posted or available for the inspector.

Boxes mounted at the correct depth so they'll sit flush with the finished wall surface, and set at consistent, code-compliant heights.

Boxes secured firmly to studs or framing, not loose or hanging on the cable.

Enough wire in every box. Leave adequate free conductor length so devices can be made up later without strain. Skimping here is a classic re-inspection.

Cables stapled and secured at the required intervals and near boxes, so nothing is loose in the cavity.

Protection from nails and screws. Where cable runs closer than it should to the face of a stud, add metal nail plates so a future drywall screw or trim nail can't pierce it.

Correct wire gauge for the breaker. The conductor size has to match the overcurrent protection. Undersized wire on a bigger breaker is dangerous and will fail.

Grounding and bonding done right, including that separated grounds and neutrals in any sub-panel.

GFCI and AFCI protection present everywhere your local code calls for it.

No damaged insulation or nicked conductors anywhere on your runs.

Make-up connections handled per local rule. Some inspectors want your splices (make-up) completed and tucked in the box at rough-in, others want them left open so they can see the conductors. Ask which your jurisdiction expects.

Panel breakers labeled and the directory filled in.

Work the list slowly. It's a lot cheaper to fix a loose staple now than to schedule a second inspection and lose a week.

Small mistakes I see trip people up

A few things beyond the big three. Boxes set too deep, so they'll end up buried behind the drywall instead of flush. Not enough spare wire in the box, so there's nothing to work with when devices go in. Cables run tight across the edge of a stud with no plate. And the quiet one: covering work before the inspector has actually passed it. I don't care how confident you feel, do not hang drywall or blow insulation until you have a passed rough-in in hand. If you cover it and they want to see it, you're opening walls back up.

When to call a pro

There's no shame in tapping out on the parts that scare you. Panel work in particular, and anything at the service, is where I'd tell most homeowners to bring in help. If you want the whole job done right or you just want a licensed set of eyes before inspection day, hire a licensed electrician from our directory. You can also sanity-check your circuits and loads with our electrical calculators before you commit to a wiring plan.

Do it once, do it right, and let the inspector do their job while the walls are still open. That inspection isn't a hoop to jump through. It's the one chance anybody gets to catch a mistake before it's sealed inside your home.

Frequently Asked Questions

What is a rough-in electrical inspection?

It's the inspection of your electrical work after the wiring, boxes, and cables are installed but before the walls are closed with insulation and drywall. With everything still exposed, the inspector can verify the parts that are about to be buried, like cable runs, box mounting, grounding, and protection from nails.

Do I need a permit for a rough-in inspection?

Yes. In most areas the permit is what schedules the inspection in the first place, and doing hidden electrical work without one can force you to open finished walls later to prove it was done correctly. Pull the permit before you start. Check the requirements for your project first so you know what applies.

What fails a rough-in electrical inspection most often?

Three show up again and again on building department lists: grounds and neutrals not separated in a sub-panel, missing GFCI or AFCI protection where the code requires it, and breakers or circuits left unlabeled. Loose boxes, too little wire in the box, and unprotected cable near studs are close behind.

Can I put up drywall before the rough-in passes?

No, and this is the mistake that hurts the most. If you cover the wiring before it passes, the inspector can't see it, and they can require you to reopen the walls. Wait until you have a passed rough-in in hand before you hang any drywall or add insulation.

Why do grounds and neutrals have to be separated in a sub-panel?

Neutral and ground are meant to be bonded together at only one point, your main service. In a sub-panel they must stay isolated on separate bars, with the bonding screw removed. If they're tied together downstream, normal current can end up on metal parts that are supposed to be safe to touch, which is a real shock and fire hazard.

Stay safe out there.