The Final Walkthrough on a Custom Home: What to Inspect Before You Accept the Keys

Eighteen months of work come down to a two-hour walk. Most owners show up excited and leave having noticed almost nothing, because by then they want to be done.

Slow down. This is the last moment you have real leverage.

There are actually three walks

• Pre-drywall. Months before the end, and the most important one nobody schedules. Everything is visible: framing, blocking, plumbing, electrical, mechanical, insulation, and the water-resistive barrier. Bring your own inspector. Once it’s covered, it’s covered.
• Substantial completion walk. The building is finished and functional, the certificate of occupancy is issued, and you generate the punch list together.
• Final acceptance walk. Punch list verified complete. This is when retainage releases.

If your contract doesn’t define “substantial completion” in writing, that’s the most-argued phrase in construction and you want it pinned down before you get here. Where it belongs in the contract.

Set it up properly

1. Schedule at least two hours, in daylight. Not the afternoon before you move in.
2. Bring your own inspector. A few hundred dollars against a seven-figure house. They will find things you won’t.
3. Bring a phone charger, a marble, and blue tape. Charger tests outlets, marble tests floors, tape marks items so nothing is disputed later.
4. The builder walks with you. Items get agreed in real time rather than emailed as a list to argue about.
5. Everything goes on one written punch list, signed by both parties, with dates for each item.

Systems — test, don’t look at

• Run heat and cooling. In a Teton Valley house, confirm every room actually reaches temperature — back bedrooms and bonus rooms over garages are where systems fall short.
• Run every faucet, shower, and tub. Check hot water recovery and how long it takes to arrive at the farthest fixture.
• Flush every toilet. Fill and drain every sink, watching underneath for drips.
• Test every outlet with the charger. Every switch. Confirm what each three-way actually controls.
• Trip and reset the GFCIs. Open the panel and confirm the circuits are labeled.
• Run the dishwasher, disposal, vent hood, and every exhaust fan.
• Open and close the garage doors, including the safety reverse.
• Test smoke and CO detectors, doorbell, and any low-voltage or smart systems.
• If there’s radiant floor heat, confirm each zone works independently. More on radiant here.

Room by room

Work one room at a time, in the same order every time, floor to ceiling.

• Floors. Roll the marble. Look down the length for lippage in tile and gaps in hardwood.
• Walls and ceilings. Stand at an angle to a window — raking light shows drywall imperfections invisible head-on.
• Trim. Miters tight, scribes clean, caulk lines even, nail holes filled and sanded.
• Doors. Every one opens, closes, latches, and stays where you put it. Consistent reveals.
• Windows. Every one opens, locks, and has intact screens. Check for seal failure and construction scratches now — nobody will believe you later.
• Cabinets and drawers. Every door and drawer, soft-close working, aligned reveals, finished interiors.
• Counters. Seams, edges, chips at sink cutouts and under overhangs.
• Paint. Coverage at corners and behind doors, clean cut lines, no roller texture on trim.
• Tile. Grout consistent, no hollow sounds when tapped, transitions clean, silicone at changes of plane rather than grout.
• Lighting. Every fixture works, cans aligned, dimmers without buzz.

Outside and underneath

• Grade slopes away from the foundation on every side. This is the one that causes expensive problems later.
• Gutters and downspouts discharge away from the house.
• Snow. Where does the roof shed, and what is underneath it? Entry, walkway, driveway, meters, heat pump, and any door you need in February.
• Siding and trim gaps sealed, flashing correct at penetrations and transitions.
• Decks: railing height and rigidity, stairs consistent, hardware correct.
• Exterior hose bibs, outlets, and lighting all function.
• Crawlspace or basement: dry, vapor barrier intact, no standing water, insulation in place.
• Attic: insulation to depth, baffles clear, no daylight where there shouldn’t be.
• Mechanical room: labeled, organized, serviceable clearances.

Documents you should leave with

• Certificate of occupancy
• The signed punch list with dates
• Final unconditional lien waivers from the builder and every sub and supplier — non-negotiable. Why.
• Written warranty with start date and claim process. What it should cover in Idaho.
• Appliance and equipment manuals, model and serial numbers, registered warranties
• HVAC balance report and any blower door or energy compliance results
• Septic and well documentation, water test results
• Paint schedule with colors, sheens, and leftover paint labeled by room
• As-built drawings, especially utility and septic locations
• Subcontractor contact list — you will want it in year two

Punch item or warranty item?

A punch item is something not finished or not right at handover. A warranty item shows up afterward through use or settling. Get the distinction agreed in writing, because it decides who pays.

One genuinely normal thing: drywall cracks and trim gaps appearing in the first heating season as the house dries and settles. Most builders handle that at a one-year walk. Ask whether yours does.

Do not release retainage until the punch list is closed

This is the whole point of holding it. A punch list with money still attached gets finished in two weeks. A punch list with no money attached can take six months, and some items never get done at all.

Verify the items yourself, then release. Not before.

Frequently asked questions

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— Bryce Swager, owner and lead builder, SwagerBuilds. I do the trim, tile and paint on my own projects, so I know exactly what this walk should find.