How to Inspect Drywall Work
Before You Pay

A drywall job can look fine under construction lighting and reveal significant imperfections the moment a pot light is turned on. Inspecting finished drywall before the final payment — and before paint goes on — is the right time to address any issues. Here's how to do it properly.

The Most Important Tool: Raking Light

Construction lighting floods the room with diffuse overhead light that makes drywall look good. Real living conditions — pot lights, floor lamps, windows — send light across the surface at an angle. This is called raking light, and it's the harshest condition for showing surface imperfections.

To replicate this during inspection, bring a bright portable work light (a shop light or a powerful flashlight works) and position it at an oblique angle to each wall surface, pointing across rather than directly at the wall. Walk the light along every wall and ceiling. Any ridge, tool mark, or insufficiently feathered seam will cast a shadow and become immediately visible.

This is the same technique professional finishers use for a pre-paint inspection — and it's the only reliable way to find problems before paint locks them in.

What to Look for During Inspection

Tape Seams and Joints

• Run the raking light across every horizontal and vertical seam. You should see no ridges or transitions between the compound and the surrounding board surface.
• At butt joints (where two sheets meet end-to-end rather than along the tapered edge), look for any raised compound that's not fully feathered. These are the hardest spots to finish and the most commonly missed.
• Press gently along each seam — any bubbling or separation from the surface indicates tape bond failure.

Fastener Dimples

• Run the raking light across every area — fastener dimples should be slightly recessed and filled flush with compound, invisible to raking light.
• Any fastener that was overdriven (broke through the paper) will show as a small bump after finishing. These need to be scraped back and re-finished.
• Any fastener that was underdriven will create a bump that shows clearly under raking light.

Inside and Outside Corners

• Outside corners should be straight — use a level or straightedge to check for bowing or waviness along the full height of the corner bead.
• Inside corners should be clean and straight — no compound lumps or feathering issues at the corner itself.
• Where walls meet ceilings, the transition should be crisp and consistent throughout the room.

Texture Matching (on Repair Jobs)

• Move a light source to different positions relative to the repaired area and compare the texture to adjacent original wall surfaces.
• Texture should blend seamlessly — no visible boundary between old and new work once painted.
• Test this before paint is applied, not after — some texture differences that seem minor show distinctly once paint levels the sheen.

What to Do If You Find Problems

Document what you find with photos and present them to the contractor before the final payment is made. A professional crew will address them without dispute — these are corrections to the agreed scope, not extras. If the contractor pushes back on fixing visible defects before final payment, that's important information about how disputes will be handled going forward.

The practical approach: walk the job with the contractor present. Point, they note. Agree on a timeline for corrections. Hold the final payment until corrections are complete and re-inspected. This is a standard part of any professional contractor relationship and should be in the written scope from the start.

For more on what a final walkthrough should look like, our residential drywall page covers the full process including how we handle the walkthrough on every job.