Peer group selection sounds straightforward until you try to do it carefully. Most teams default to industry classification codes and revenue bands, then wonder why the benchmarks never quite fit. The problem is usually that those two filters are not specific enough.
Step 1 - Start with operating model, not industry code
Two companies in the same sector with the same revenue can have completely different cost structures if one runs a direct sales model and the other sells through distributors. Before anything else, define your operating model in concrete terms - how you acquire customers, how you deliver, how you staff.
Step 2 - Apply a geography filter with real precision
Canadian operations benchmarked against US or UK peers will consistently show labour cost distortions. Provincial differences matter too - a Quebec-based operation has a different payroll tax environment than an Alberta one. Build your peer group within the geography where your costs actually live.
Step 3 - Limit the group size deliberately
Larger peer groups feel more statistically robust but often dilute the signal. A set of 8 to 12 genuinely comparable organizations gives you more usable insight than 60 loosely matched ones. Tighter is almost always better here.
Step 4 - Revisit the peer group annually
Companies change. A peer that matched your profile three years ago may have shifted its model significantly. Treating the peer group as a fixed asset rather than something that needs maintenance is a quiet source of benchmarking drift.
Good peer group construction takes a few hours of deliberate work. It saves months of chasing explanations for numbers that were never comparable in the first place.