Based on the research and cost-impact analysis above: acoustic enclosure (soundproof office pods) provides the highest impact for the highest-priority noise types — conversational speech and call audio — which are the categories that employees consistently identify as their primary productivity disruptors. No other single-category solution addresses speech privacy for both the person inside (focus) and their colleagues outside (ambient noise reduction). For organisations where acoustic surface treatment is also needed, pods plus carpet is the highest-value two-layer combination.