Construction Electrical Rough-In Inspection Tips Every GC Needs to Know

You have been there. The drywall crew is scheduled for Monday, the electrician swears everything is done, and the inspector shows up Friday afternoon only to slap a red tag on the job. Now you are scrambling to get the electrician back, pushing drywall out a week, and explaining the delay to a client who does not care whose fault it is.

Electrical rough-in inspections are one of those phases that can either sail through without a hitch or blow up your entire schedule. The difference usually comes down to how much attention the GC pays before the inspector ever sets foot on site.

This is not an electrician’s guide to wiring a house. This is a GC’s guide to making sure your electrical sub did the job right, catching problems early, and keeping your project moving. Whether you have been running jobs for twenty years or you are still figuring out what to look for, these tips will help you walk a rough-in with confidence.

Understanding What the Inspector Is Actually Looking For

Before you can check your sub’s work, you need to understand what the inspector cares about. Electrical rough-in inspections are not a mystery. Inspectors work from a checklist based on the National Electrical Code (NEC) and any local amendments your jurisdiction has adopted.

Here is what they are checking at a high level:

Wire sizing and circuit layout. Every circuit needs the right gauge wire for the breaker size. A 20-amp circuit gets 12-gauge wire. A 15-amp circuit gets 14-gauge. Sounds simple, but you would be surprised how often a sub runs 14-gauge on a 20-amp kitchen circuit because they grabbed the wrong spool.

Box fill calculations. Every junction box and device box has a maximum number of conductors allowed based on its cubic-inch volume. Inspectors count wires, grounds, clamps, and devices. An overstuffed box is a fire hazard and a guaranteed red tag.

Grounding and bonding. Every box, every circuit, every metallic component needs a proper ground path back to the panel. The inspector will check for continuous grounding conductors, proper bonding of metal boxes, and correct connections at the panel.

Wire protection and support. Wires need to be stapled within specific distances of boxes and at regular intervals along runs. Where wires pass through studs or joists, they need nail plates if the hole is less than 1-1/4 inches from the face of the framing member. This is probably the number one thing inspectors flag.

AFCI and GFCI protection. The 2020 and 2023 NEC have expanded AFCI requirements to cover nearly every living space. GFCI protection is required in kitchens, bathrooms, garages, outdoors, and several other locations. Your sub needs to plan for these at the panel or at the first outlet in the circuit.

Clearances and accessibility. The panel needs proper working clearance (typically 30 inches wide, 36 inches deep, and 78 inches high). Boxes need to be set at the right depth for the finished wall surface.

If you want to go deeper on the permitting side, check out our permits guide for a full breakdown of how to manage the inspection process across multiple trades.

Your Pre-Inspection Walkthrough Checklist

This is where you earn your money as a GC. Doing a walkthrough before calling in the inspector is not about second-guessing your electrician. It is about protecting your schedule.

Thousands of contractors have made the switch. See what they have to say.

Here is what to look for, room by room:

Nail plates everywhere wires pass through framing. Walk every wall and check every stud penetration. If you can see a wire passing through a stud and there is no nail plate, mark it. This is the single most common rough-in failure, and it takes about ten seconds per plate to fix. Your sub has no excuse for missing these.

Wire staples and support. Romex should be stapled within 12 inches of every box and every 4.5 feet along the run. Look for loose or dangling wires. If something looks like it was thrown in at the last minute, it probably was.

Box placement and depth. Hold a scrap piece of drywall against the stud next to each box. The front edge of the box should be flush with or slightly proud of the finished surface. Boxes set too deep will need extension rings, and boxes set too far out will create visible gaps around cover plates.

Open knockouts. Every unused opening in a junction box needs to be covered. Look for missing knockout covers, especially on boxes that have been repositioned during the rough-in.

Wire entering boxes properly. Every wire entering a metal box needs a clamp. Plastic boxes have internal clamps, but the wire still needs to be properly seated. Look for wires just shoved through holes without being secured.

Labeling. Some jurisdictions require circuit labeling at the rough-in stage. Even if yours does not, check that your sub has a system for tracking which wire goes where. It will save massive headaches during trim-out.

Take photos of everything during your walkthrough. Good documentation protects you if there is a dispute later, and it makes it easy to show the sub exactly what needs fixing. If you are not already using a system to organize job photos, take a look at Projul’s photo and document management to keep everything in one place and tied to the right project.

Common Rough-In Problems and How to Catch Them Early

Some problems you will see over and over. After a few dozen rough-in walkthroughs, you start to develop an eye for the stuff that trips up inspectors.

Overfilled boxes. This is a math problem that electricians sometimes skip. A standard single-gang old-work box (18 cubic inches) can hold a limited number of conductors. When a sub runs a three-way switch circuit with an extra hot for a fan, that box fills up fast. If a box looks crowded, count the wires. If the count is borderline, tell the sub to upsize the box. It is a lot easier to swap a box now than after drywall.

Missing AFCI protection. The NEC now requires AFCI protection in kitchens, laundry rooms, bedrooms, living rooms, dining rooms, hallways, closets, and more. Some subs still wire jobs like it is 2014. Check the panel schedule against current code requirements for your jurisdiction. If your sub’s plan does not include AFCI breakers where required, flag it now.

Improper bathroom fan wiring. Bathroom exhaust fans wired to the light switch instead of a separate switch (or a timer/humidistat switch where required by code) is a common oversight. Check the plan and check what is actually wired.

Wires too close to the edge of framing. The 1-1/4 inch rule exists for a reason. If a wire passes through a stud or joist and the edge of the hole is less than 1-1/4 inches from the nearest face of the wood, a nail plate is required. Some subs drill right down the center and are fine. Others drill off-center and skip the plate. One misplaced drywall screw can puncture a live wire, so this is not something to overlook.

Missing bonding jumpers. In metal pipe systems, water heaters, and gas piping, bonding jumpers are often required. These get missed when the electrician focuses on the branch circuit wiring and forgets the bonding requirements.

Panel issues. Check that the panel has the right number of spaces for all planned circuits, that the main breaker is correctly sized, and that there is room for any future circuits the homeowner or plans call for. Swapping a panel during rough-in is annoying. Swapping one after drywall is a nightmare.

For a deeper look at catching quality problems across all your trades, our quality control guide walks through a system that works for electrical, plumbing, HVAC, and everything else.

Managing Your Electrical Sub Through the Rough-In Phase

A good electrical sub makes your life easy. A mediocre one creates extra work for you. Either way, how you manage the relationship during rough-in has a direct impact on whether the inspection goes smoothly.

Set expectations at the pre-construction meeting. Before the sub starts work, walk the plans together. Confirm the panel location, circuit layout, and any special requirements (home runs for kitchen appliances, dedicated circuits for HVAC equipment, low-voltage rough-in for data and AV). If you are working from blueprints, make sure your sub has the most current set. Outdated plans cause wiring mistakes that are expensive to fix. Our blueprints guide covers how to keep plan sets current across your trades.

Require a walkthrough before you call the inspector. This should be in your subcontract. The electrician walks the job with you (or your super) and confirms everything is complete and ready for inspection. Do not accept “it’s done” over the phone. Walk it together. This is where the checklist from the previous section comes in.

Make re-inspection costs the sub’s responsibility. Your subcontract should clearly state that if the rough-in fails inspection due to the sub’s work, the sub covers the cost of the re-inspection fee and any schedule-related damages. This is standard in most GC/sub agreements, but if it is not in yours, add it.

Coordinate with other trades. Electrical rough-in does not happen in a vacuum. Plumbers and HVAC crews are often working in the same spaces. Scheduling conflicts lead to trades working over each other, which leads to displaced wires, damaged boxes, and general chaos. Use your scheduling tools to sequence the work properly. Plumbing and HVAC typically rough in first (their pipes and ducts are less flexible than wire), with electrical following.

Document everything. Photos of the rough-in before inspection, photos of any issues found, photos of corrections made. If a dispute comes up six months later about whether something was done right, photos are your proof. This goes double for anything that will be hidden behind drywall for the next fifty years.

If managing subs is the part of your job that keeps you up at night, our subcontractor management guide has a full breakdown of how to build a system that keeps your subs accountable without micromanaging every move.

What to Do When the Inspection Fails

It happens. Even good electricians miss things. Even experienced GCs miss things on their walkthrough. The key is handling a failed inspection without losing your mind or your schedule.

Stay calm and get the correction list. The inspector will provide a list of items that need to be corrected. Get that list in writing (most inspectors provide it on the spot or email it the same day). Do not argue with the inspector on site. Even if you think the inspector is wrong, the job site is not the place to fight that battle.

Get the sub back immediately. This is where your subcontract language matters. The sub needs to treat corrections as a priority, not something they will get to next week. Most rough-in corrections are minor (nail plates, staples, box fill adjustments) and can be done in a few hours. The faster the sub responds, the less impact on your schedule.

Schedule the re-inspection before the sub starts corrections. Sounds backward, but here is why it works. If your jurisdiction has a 48-hour lead time for inspections, get on the schedule first. Then make sure the corrections are done before the inspector comes back. This avoids losing an extra two or three days waiting for the re-inspection appointment.

Review what went wrong. After the correction and re-inspection, take five minutes to figure out what happened. Was it a sloppy sub? A plan change that did not get communicated? An inspector with a reputation for being unusually strict? Understanding the cause helps you prevent it on the next job.

Update your walkthrough checklist. If the inspector caught something you missed, add it to your personal checklist. Over time, your pre-inspection walkthrough gets better and better. The goal is to never be surprised by an inspector again.

Failed inspections are stressful but they are also recoverable. The real danger is a failed inspection that you did not plan for at all. If you have buffer time in your schedule and a responsive sub, a failed rough-in costs you a couple of days, not a couple of weeks. Our safety inspections guide covers how to build inspection prep into your overall project workflow so nothing catches you off guard.

Building a Repeatable System for Every Rough-In

The best GCs do not rely on memory or gut feeling. They build systems. And electrical rough-in is one of those phases where a repeatable system pays off on every single job.

Create a standard rough-in checklist. Take the items from this article and customize them for your market and your typical project types. Print it out or keep it on your phone. Walk every rough-in with the same checklist. Over time, you will add items specific to your inspectors, your subs, and the code quirks in your jurisdiction.

Standardize your photo documentation. Take the same set of photos on every job. Panel with cover off showing all connections. Every bathroom. Every kitchen. Each bedroom’s switch and outlet locations. Overhead shots of attic runs. These photos become your insurance policy and your training tool for new project managers.

Track inspection results across jobs. If a particular sub keeps failing rough-in inspections, that is a pattern you need to see. If a particular inspector is flagging things that others do not, you need to know that too. Keep a simple log of inspection date, result, corrections needed, and time to resolution.

Build it into your project template. Every new project should automatically include a rough-in walkthrough task, scheduled a day or two before the inspection. It should include photo documentation milestones tied to the rough-in phase. And it should include a buffer day between the planned inspection and the start of insulation or drywall. If you want to see how a project management tool can make this automatic instead of something you have to remember every time, check out a demo of Projul and see how other GCs are running their inspection workflows.

Debrief with your sub after every job. Five minutes at the end of a project to review what went well and what did not is worth more than any checklist. Good subs appreciate the feedback. Great subs ask for it.

Electrical rough-in is just one phase of a much bigger process, but it is one of the phases where small mistakes create big problems. A wire behind drywall is there for decades. A missed ground fault can sit dormant until someone gets hurt. The work your electrical sub does during rough-in is some of the most important work on the entire project, and it deserves your attention.

Try a live demo and see how Projul simplifies this for your team.

You do not need to be an electrician to manage this phase well. You need a checklist, a system, and the willingness to walk the job before the inspector does. Get those three things right, and your electrical rough-ins will stop being a source of stress and start being just another box you check on the way to a finished project.