What a residential building inspector checks, stage by stage

The stages in order

Exact stage lists vary by jurisdiction, and some combine or add visits. A typical residential sequence looks like this, with the outline area each one feeds.

Permit and plan review

Before a shovel goes in, the permit sets the code edition and the design criteria. Inspectors need to know which edition applies and what local amendments change it. This is the code administration area, which is 4% of the B1, and building planning, 8%, covers room sizes, light and ventilation. Read the permit and drawings first, because every later check refers back to them.

Footing

The footing visit comes before concrete. The inspector looks at the excavation, the depth and size of the footing and the condition of the soil. Reinforcement and the cleanliness of the trench are checked before the pour. The goal is to catch problems while they are still easy to fix.

Foundation

After the footing, the foundation walls go up. Inspectors check wall dimensions, reinforcement, anchorage to the footing and the details at openings. Drainage and waterproofing items belong here too. Footings and foundations together are 16% of the B1.

Floor framing

Floor framing means joists, bearing, connections and sheathing. The question is whether the members span what the plans show, with the right bearing at each end. The span table walkthrough shows how the lookup works, with invented numbers. Check openings, notches and bored holes as well. Floor construction is 14% of the outline.

Wall and roof framing

This is the biggest stage for the exam, since wall construction and coverings are 27% of the B1 and roof and ceiling construction another 14%. Inspectors look at:

• Headers over openings and the jack studs that carry them.
• Wall bracing and the connections that resist lateral loads.
• Fireblocking and draftstopping where cavities connect.
• Rafters, ceiling joists and ties, including rafter and collar ties.
• Sheathing and fastening patterns.

Many of these checks are lookups with conditions, so exam practice should match the way you would find them on site.

Pre-cover checks

Before insulation and drywall hide the work, inspectors check the framing and other trades' rough work where the jurisdiction asks for it. Framing, fireblocking, firestopping at penetrations and insulation in the right locations are common items. Once the walls are closed, problems get expensive, which is why this visit exists.

Final

At the final, the inspector walks the finished house for life-safety items. Stairs, guards and handrails, emergency escape openings, and smoke and carbon monoxide alarms are typical items. This is the public safety area, which is 17% of the B1. Section numbers moved between the 2021 and 2024 IRC for several of these topics, as the edition guide shows. The stair check tool works one example through both editions.

What a good visit looks like

The best inspectors work from the same routine at every stage:

1. Check the permit set first. Confirm the stamped permit drawings are on site and match the stage.
2. Walk the work in a fixed order. A consistent path stops you skipping a corner.
3. Compare, don't assume. Measure spacing, bearing and sizes, because site conditions often drift from the drawings.
4. Cite the section. A correction notice that names the section number is easier to act on and to defend.
5. Record the result. Pass, correct or hold, with notes the builder can act on.

The exam rewards the same habit. A question gives you a situation and asks which provision applies, so the winning move is to name the condition, find the section and read what it says in your own book. That is the same loop as a site visit, just on paper.

Where stages overlap

Real jobs do not always follow a tidy list. A single visit can touch several areas. A framing inspection might include headers, bracing, fireblocking and roof ties together, and a final can circle back to foundation drainage. Study by topic, then practice mixed sets so you can switch between areas without losing time. The B1 mixes areas in one sitting, so your preparation should too.

Turn the stages into study blocks

Map your weeks to the stages:

1. Footing and foundation lookups.
2. Floor framing and span tables.
3. Wall framing, headers and bracing.
4. Roof framing and ties.
5. Life-safety items for the final.
6. A timed mix across all areas.

A 30-day plan uses this order for people in the trades. For the weights behind it, read the B1 outline guide. The free 10-question check at /icc-inspector shows exactly which areas to study first.

FAQ

What does a building inspector check?

They check that construction matches the permit drawings and the adopted code at defined stages. In residential work that covers foundations, framing, protection against fire and life-safety items.

How many inspections does a house get?

It varies by jurisdiction. Many use footing, foundation, framing and final visits, and some add more. Check your jurisdiction's list.

Are inspection stages the same as the B1 outline areas?

No, but they map closely. The outline groups topics, and the stages show when each one comes up on a project.

Do inspectors check the code edition?

Yes. The jurisdiction adopts an edition and may amend it. Know which one applies before you check anything.