What should I look for when inspecting a completed drywall job before final payment to a GTA contractor?

Before releasing final payment, inspect every wall and ceiling surface using a bright work light held at a raking angle (nearly parallel to the surface) — this technique reveals imperfections that are invisible under normal overhead lighting but will become glaringly obvious once the room is furnished and lit with floor lamps or recessed lighting. A $30 LED work light is the single best tool for inspecting drywall finishing quality.

The raking light test is what separates a professional inspection from a casual glance. Hold a bright light source flat against the wall surface and slowly move it across every taped joint, screw line, and corner. At this extreme angle, even subtle ridges, depressions, bubbles, and tool marks cast visible shadows. Pay particular attention to butt joints (where the non-tapered ends of two sheets meet) — these are the hardest joints to finish flat and are the most common location for visible ridges. Check the taped joint running along the ceiling-to-wall transition, as this is another common trouble spot, especially in GTA homes where truss uplift and seasonal movement stress this joint.

What to look for specifically:

Joint visibility — On a Level 4 finish (standard paint-ready quality), taped joints should be invisible under normal room lighting. Under raking light, slight crowning over joints is acceptable, but the transition from compound to bare drywall should be gradual and smooth over 10-12 inches. If you can see a distinct ridge or line where the compound edge ends, the finishing coats were too narrow or were not properly feathered.

Screw and nail pops — Run your hand over the screw lines (typically every 12 inches on ceilings and 16 inches on walls). Each screw should be dimpled just below the paper surface, filled with compound, and sanded smooth. If you feel any bump, the compound was not properly applied. If you see a ring of cracked or raised compound around a screw, the screw may have been overdriven (breaking the paper face), which means it has no holding power and will eventually pop.

Corner bead — Check every outside corner by running your finger down the edge. It should be straight, plumb, and smoothly finished on both sides. Dented or wavy corner bead is visible from across the room and is a legitimate reason to request correction. Inside corners should have a clean, straight line with no excess compound or tape bubbling.

Tape adhesion — Gently press on taped joints and corners. Properly embedded tape is bonded flat to the drywall surface. If you feel any hollow areas, bubbles, or movement under your fingers, the tape was not fully embedded in the bedding coat and will eventually crack, peel, or telegraph through paint. This is a serious deficiency that must be corrected before painting.

Surface texture consistency — The entire surface should have a uniform texture. If some areas feel rougher than others, or if you can see swirl marks, skip marks, or sanding scratches, the final sanding was incomplete. Under your raking light, the surface should look consistently smooth (for a smooth finish) or consistently textured (for a textured finish).

What Constitutes Acceptable vs. Deficient Work

No drywall finish is perfect — even Level 5 finishes (the highest standard) allow for minor imperfections that are invisible under normal decorating lighting. The standard your contractor should meet depends on what finish level was agreed upon. Level 4 is the standard residential finish in the GTA and should produce walls and ceilings that look smooth and joint-free under normal lighting. Level 5 — which adds a skim coat of compound over the entire surface — is required for areas with critical lighting conditions such as large windows casting raking light, or rooms with recessed pot lights that wash the walls.

Document any deficiencies with photographs taken with the raking light, and present them to your contractor in writing. A professional GTA drywall contractor will address legitimate concerns without pushback — touch-up and correction are a normal part of the trade. The typical cost for a complete drywall finishing job in a standard 12x12 room is $1,500-$3,500, and that price includes a final walkthrough and reasonable corrections.

Do not paint before inspecting — once primer and paint go on, joint imperfections become much harder to identify and the contractor can argue that the paint application caused the issue. Inspect the raw finished drywall before any primer is applied.