Pre-Drywall Inspection Checklist: What to Check Before the Walls Close

Part of the guide: The Site Inspection Checklist to Run on Every Walkthrough

A pre-drywall inspection is a walk through a new house after the framing and the rough plumbing, electrical and HVAC are in, and before the walls are closed. It is the only time you can see the structure, the wiring, the pipes and the ducts that will be behind the drywall for the life of the house, and the cheapest time to have any of them corrected. Buyers do it themselves or hire a home inspector; either way, ask the builder for the date in writing, because the window is often only a few days.

The building department's rough-in inspections come first. Passing them means the work met the code minimum where the inspector looked; it does not mean the outlets are where your plans show them, or that the blocking for your cabinets is there.

Before you go

• Access in writing. Many purchase agreements limit buyer visits to the site. Ask the builder for a time and, if you are bringing an inspector, say so.
• The plans and your options list: the electrical layout, the kitchen plan and anything you paid extra for, such as added outlets, recessed lights or data points.
• Kit: flashlight, tape measure, phone with a full battery, a moisture meter if you have one, closed shoes. Follow the site's rules; hard hats may be required.
• Do not mark the builder's work without permission. Photograph and list instead.

The checklist

Framing and structure

• Studs, joists and rafters not split, twisted or badly notched. In load-bearing walls the IRC limits notches to 25 percent of the stud width and bored holes to 40 percent (60 percent in doubled studs); in non-bearing walls to 40 and 60 percent (IRC R602.6).
• Headers over every window and door opening; hangers, straps and hold-downs installed where the plans show them.
• Blocking for everything that will hang on a wall: upper cabinets, grab bars, towel bars, handrails, a wall-mounted TV, shelving. Adding it later means cutting the drywall.
• Fireblocking at floor and ceiling levels and around penetrations between floors (IRC R302.11).
• Housewrap lapped like shingles, upper layer over lower; windows flashed at the head and sill.
• No standing water, mold or dark staining on framing or sheathing. Many builders aim to close walls when the wood is below about 19 percent moisture content, the threshold for kiln-dried lumber grades; ask if a reading looks high.

Electrical

• Every box where the plan and your options show it, at consistent heights, set to finish flush with the drywall.
• Steel nail plates where a cable passes through a hole closer than 1-1/4 inches to the face of the stud (NEC 300.4(A)(1)).
• Cable secured within 12 inches of each box and at intervals of no more than 4-1/2 feet (NEC 334.30).
• Smoke and carbon monoxide alarm locations wired; low-voltage and data runs where you asked for them.
• Recessed lights rated for contact with insulation (IC-rated) wherever insulation will touch them.

Plumbing

• Supply lines under test pressure if the plumber is still testing; ask to see the gauge.
• Stub-outs where the fixtures will be: sinks, toilet, washer box, fridge water line, tub and shower valve at the height you expect.
• Shield plates where pipes pass through holes near the stud face (IRC P2603.2.1).
• Drains sloped, vents in place, no pipes crushed or kinked.

HVAC

• A supply register in every room and returns where the plans show them; duct runs connected and sealed, flexible duct not crushed or sagging.
• Bathroom and kitchen exhaust ducted to the outside, not into the attic or a soffit (IRC M1501.1).

Insulation, if it is already in

• Batts fill each cavity without gaps or compression, cut around boxes and pipes rather than stuffed behind them.
• Baffles at the eaves; gaps around windows and doors sealed.

Photograph every wall before it closes

This is the most useful thing you will do on the visit, whatever you find. Go room by room and photograph every wall from corner to corner, with a tape measure stretched along the floor so distances can be read later. Add a close-up of every box, valve and junction. Name the album by room.

Years later, those photos tell you where not to drill for a shelf, where the pipe runs before a bathroom remodel and where a cable goes when an outlet dies. They also settle questions about hidden work during the warranty period.

What to do with what you find

1. One written list, numbered, each item with its photo and location, sent to the builder the same day.
2. Ask for a reply before drywall: which items will be corrected, and confirmation when they are.
3. Go back if you can to check the corrections before the walls are closed, or ask for photos of each.
4. Keep the list. It is the starting point for the final walkthrough.

What to do next

Ask your builder today when the rough-in inspections are booked and when you can visit. Print the pre-drywall checklist, take the plans and your options list, and plan an hour for the photos alone.

Punch List AI keeps the photos, the numbered items and the list in one project, and the same project carries on to the final walkthrough.

Questions people ask

When should a pre-drywall inspection happen?

After the building department's rough-in inspections and before insulation if possible; before drywall at the latest. Ask the builder for the date in writing.

Is a pre-drywall inspection required?

Not by the code. The building department does its own rough-in inspections; the pre-drywall walk is the buyer's check against the plans and the options paid for.

What is the most common pre-drywall defect?

Missing nail plates where cables or pipes pass close to the stud face, and missing blocking for cabinets, grab bars and wall-mounted TVs.

Can I take photos during the pre-drywall walk?

Usually yes, and you should: every wall, corner to corner, is a permanent map of what is behind the drywall.