10 Pre-Drywall Items You Need to Check

There is one moment in your build — the morning before drywall begins — when you can walk every wall and see every wire, every pipe, every duct, every block. After drywall, all of it disappears, and changes get exponentially more expensive. Spend two hours on the pre-drywall walk. These are the ten items that, caught now, cost a hundred dollars to fix, and caught later, cost ten thousand.

1. Blocking is in for every future need

Walk every wall and confirm there's blocking for everything that will mount: TVs (every location), towel bars, robe hooks, toilet paper holders, grab bars (now and future), floating shelves, wall-mounted vanities, art rails, kitchen pot racks, mudroom bench seats. We covered this exhaustively in our blocking article — this is your last chance to add more.

2. Outlet locations and counts

Stand in each room and visualize where you'll plug things in. Are there outlets where you need them? Are there outlets behind future TVs, behind the bed for chargers, at the kitchen island for stand mixers, at the coffee station for the espresso machine?

Common misses: islands without outlets (or with only one), bathrooms without enough outlets, primary bedroom without bedside outlets at correct heights, garages without enough outlets per wall, exterior outlets at the right locations.

3. Switch locations and heights

Walk into each room as you would after move-in. Is the switch where your hand would land — usually just inside the door, on the latch side? Are 3-way switches at every stair top and bottom? Are exterior switches by every door that leads out?

Heights: 42" to switch center (not the 48" older code allowed). Lower switches are more comfortable for everyone, including a 5'4" spouse and visiting children.

4. Lighting plan is layered (not just cans)

Look up. Are all your overhead lights recessed cans? Is there a pendant location over the kitchen island? Wall sconces flanking the primary bath mirror? Picture lights at major art walls? Cove lighting for the family room ceiling treatment?

If every room has only ceiling cans, you're heading to dentist-office lighting. Push the team to spec layered lighting before drywall buries the wiring opportunities.

5. Network and AV cabling

Pull lots of CAT6A, conduit, and coax now. Specifically check:

• Two CAT6A drops at every TV location
• CAT6A drops at every desk and office location
• CAT6A drops at every primary room ceiling for future Wi-Fi access points (one drop per 30–40 ft of distance)
• CAT6A drops at every exterior soffit corner for cameras (whether you install day one or not)
• Conduit from the network closet to the attic for future cable runs
• Speaker wire to every ceiling location where ceiling speakers might go
• Coax to every TV location (still useful for over-the-air antennas)

6. Plumbing locations are correct

Walk every bathroom and kitchen. Verify:

• Toilet rough-ins match the toilet you ordered (12" standard; some toilets need 10" or 14")
• Tub drains at the foot of the tub, not the head, unless intentional
• Shower drain is centered if a single point, or against the curb if linear
• Sink supply lines come up in the right location for the cabinet plumbing
• Refrigerator water line is at the right side of the fridge location
• Hose bibbs are accessible and code-compliant (frost-free, vacuum breaker)
• Recirculation pump line is run if applicable
• Hot water lines are insulated (especially in cold spaces)

7. HVAC ductwork is sized, sealed, and located

Inspect every duct run:

• Supply registers are in the right location (typically at exterior walls, under windows)
• Return air paths are adequate (a transfer grille or dedicated return per room for closed-door rooms)
• Duct insulation is intact and well-sealed
• Duct joints are sealed with mastic or UL-181 tape (not standard duct tape)
• Thermostat locations are sensible (not in direct sun, not in hallways)
• Bath fans are vented to the exterior (never to an attic or soffit)
• Dryer vent is short and straight where possible (each elbow reduces capacity)

8. Insulation is properly installed (no voids, no gaps)

Walk every wall and look at the insulation install. Common failures:

• Batt insulation compressed behind plumbing, wiring — loses 30–50% of R-value when compressed
• Gaps at the top or bottom of stud bays where batts didn't reach
• Insulation not in corners (where two walls meet, the corner cavity is often missed)
• Cantilevered floors (bay windows, overhangs) inadequately insulated — cold floors above for decades
• Recessed light cans not insulated above (IC-rated cans are designed to have insulation on top)
• Around attic access — insulation pulled back permanently from the hatch perimeter creates a big cold spot

9. Air sealing is complete

Confirm air sealing is done before insulation, not after (insulation hides leaks rather than sealing them). Check:

• Sheathing seams taped on exterior
• Plate-to-subfloor joints caulked
• Top plates caulked at interior walls
• All penetrations (wires, pipes, ducts) sealed where they pass through plates and sheathing
• Rim joists sealed
• Electrical boxes on exterior walls gasketed
• Recessed lights, bath fans, and any ceiling penetrations to the attic sealed

10. Framing corrections are made

Last walk for any framing issues. Common items still to catch:

• Bowed studs in finish walls (especially the wall behind a TV or art) — sister or replace
• Out-of-plumb walls (over 1/8" in 9') — shim or rebuild
• Headers undersized for the opening or load
• Missing structural straps, hangers, or hardware noted on the plans
• Stair tread depth and rise consistency
• Notched or drilled joists outside allowable limits
• Roof framing irregularities (sagging ridges, inconsistent rafter spacing)

The walk itself

Schedule the pre-drywall walk with your builder, your architect, and (if you have one) your interior designer. Bring the plans. Bring a tape measure. Bring a level. Bring sticky notes. Walk every room. Question anything that doesn't match the drawings. Take photos of every wall before drywall. These photos become invaluable later when you need to drill into a wall and need to know what's behind it.

Two hours of pre-drywall walk — the highest-leverage two hours of your entire construction phase. Don't skip it. Don't rush it. Don't let your builder push you past it.

— Angel Flores, Founder & Principal Builder. Thirty years designing and building distinguished custom homes across Dallas–Fort Worth and North Texas. Get the free Ultimate Home Building Checklist for the field-tested list we walk every Angel home through.