The decision for this particular color
Classic Gray can be considered for whole house if its color and depth suit the space; the first design question is enough contrast to justify a second neutral. Classic Gray's lightness makes subtle separation its useful role; demanding a strongly outlined gray wall would suggest a different brief.
Why the white trim and pale limestone relationship matters
Pale limestone and white trim can leave little value contrast, so the decision may be about whether a second neutral is needed at all.
Classic Gray has an LRV of 73.67; Benjamin Moore Pale Oak OC-20 is 68.64. The difference is 5.03 points, with Classic Gray returning more light under the reference measurement.
Walk the connecting sightlines
Carry one Classic Gray board from the brightest room to the connecting hall and the room with the least useful daylight. Leave each room's fixed whites visible. The white trim and pale limestone palette may work in the main space yet fail beside a different upstairs carpet. Inspect both sides of the connecting doorway; a common paint name does not require an identical-looking wall in every exposure.
A shared palette does not require one paint everywhere
Retain it for a gentle wall-to-trim difference, not a pronounced gray outline. The north-facing room assessment covers that related choice. The situations that call for another color covers that related choice.
If Classic Gray passes in the main room but fails against another fixed floor, a related color in that space may be more coherent than repeating one formula everywhere. Review both rooms through the connecting doorway. The living-room palette covers that related choice. Before ordering samples, compare room-planning features in the paint color visualizer roundup.
Sources & notes
Color specifications: Benjamin Moore Classic Gray OC-23. The recorded LRV is 73.67. Named comparison values come from the respective manufacturers; material schemes are editorial suggestions.
This guide reviews published color information and proposes practical sample checks. It does not claim first-hand paint testing or customer-review scores. Benjamin Moore does not sponsor or endorse this site. Product names and trademarks belong to their respective owners. Confirm the color in a physical sample and select the coating for the actual surface and finish.

