A family in Arizona hired a talented architect to design their home. To save money, they had someone less experienced draw the construction documents. The plans were permitted, and the house was built.
The problem showed up at the very end. As the crew started installing finishes, they realized a key dimension was off by about six inches for the entire length of the house. Bathroom openings that should have been 40 inches wide were 34 or 36. The doors they had ordered didn’t fit. In other rooms, the cabinets ran into the walls.
By then, the slab had been poured and the walls were framed, insulated and drywalled. Fixing it properly would have meant taking the house apart, so the family had to live with it. Even so, the repairs that were possible ran into the hundreds of thousands of dollars.
The hardest part? The general contractor had known about the error and kept it from the owners. A simple inspection at the slab or framing stage would have caught it while it was still easy to fix.
Why your builder shouldn’t be the only set of eyes
Construction happens in layers. Each phase is built on top of the last, and when a mistake isn’t caught, it gets buried under the next layer. Then you have to peel everything back to fix it, and build it all again.
Your builder should have its own quality control, and the city will inspect your home along the way. But a municipal inspection only confirms the work meets a minimum code standard. It doesn’t check whether your home matches your plans, your specifications, or the quality you’re paying for.
Independent inspections at the right moments add a third set of eyes, one that answers only to you. The key is timing: each inspection has a short window, after the work is in place and before the next layer covers it.
The six inspections at a glance
| Inspection | When to schedule it | What it protects |
|---|---|---|
| 1. Pre-slab | After footings and underground lines are in, before concrete | Dimensions, layout and everything under the slab |
| 2. Framing | When structure and roof framing are complete | Walls, trusses, joists and openings |
| 3. Pre-drywall | After rough-ins, before insulation and drywall | Wiring, plumbing, HVAC and low-voltage runs |
| 4. Pre-completion (roof) | Before the final roofing material goes on | Flashing, underlayment and waterproofing |
| 5. Deficiency review | Ongoing through the finish phase | Finishes, fit and anything that doesn’t match the specs |
| 6. Sewer scope and radon | As needed, before move-in | Sewer lines and indoor air |
1. Pre-slab: before the concrete makes it permanent
When: Once the footings and structural elements are in place, and again before the slab is poured.
This inspection has two parts. The first confirms the size of the house, the corners and the dimensions match the plans. The second checks everything that will live under the slab: waste lines, water supply, gas lines and any underground HVAC. Once the concrete goes in, all of it is effectively permanent.
This is the inspection that would have caught the six-inch error.
2. Framing: while the bones are still visible
When: Once the structural steel, framing and roof systems are in place.
An inspector confirms that walls, trusses and floor joists are straight, tight and built to plan, and that door and window openings are the right size. Every finish in the house will sit on top of this framing. If it’s off, the problem follows you all the way to the end.
3. Pre-drywall: your last look behind the walls
When: After the electrical, plumbing, HVAC and low-voltage rough-ins are installed, before insulation and drywall.
This is the last chance to confirm that every light is straight, every air supply is where it belongs, and every outlet and wire run is in the right spot. It’s also the best time to create a record of what’s behind your walls.
Why we scan with Matterport. On our projects, we capture the home with Matterport 3D scanning at this stage. Years later, you or your plumber can pull up the scan, take measurements and see exactly what’s behind any wall without cutting into it. The scan also gives you visual proof for insurance and warranty claims. A few hundred dollars in imaging can prevent thousands in invasive repairs. A scan doesn’t replace the inspection itself, but it preserves what the inspector saw.
4. Pre-completion: the roof inspection most people skip
When: Right before the final roofing material is installed, while the underlayment and waterproofing are still visible.
Roofing failures often don’t show up until years after move-in, but the damage can start much earlier. When a schedule stretches and the underlayment sits exposed to the weather longer than it should, it can degrade before the final roof ever goes on. Checking the flashing, underlayment and waterproofing at this stage is one of the most important steps in the process, and one of the most frequently skipped.
5. Deficiency review: ongoing through the finishes
When: Regularly throughout the finish phase, as materials arrive and are installed.
This is less a single inspection and more a habit. As cabinets, tile, stone and fixtures go in, someone should be checking them against what was selected and specified, and flagging anything that doesn’t match right away, before more work gets built around it. Clear, photo-backed documentation of each issue makes it far easier to resolve, whether through a quick fix, a warranty claim or a negotiation.
6. Sewer scope and radon: before you move in
When: As needed, before move-in.
Construction debris in a sewer line is invisible until it isn’t. A camera inspection of the lines before move-in can catch blockages or damage before the first backup. Radon testing is worth adding too. The EPA recommends testing all homes for radon, new construction included.
If you don’t have an owner’s representative
Coordinating these inspections, knowing who should perform each one and making sure every finding gets fixed is a core part of what an owner’s representative does. If you’re managing it yourself, build these three habits:
- Photograph all rough-in work before it’s covered. Label each photo by date and location, and get both wide shots and close-ups.
- Keep a daily log. Note what was completed, what was delivered, who inspected, what questions came up and what was decided.
- Get every change approved in writing. Verbal approvals are where disputes begin.
If something ever goes wrong, your records are your strongest position. Facts always win.
One more tip for site visits: construction sites are messy, and something that looks wrong may simply not be finished yet. When you do have a concern, bring it to your builder in writing, calmly and with context.
