Design Solution · MEP
Design Solution · Dream about it
Parallel servicing options compared before commitment.
Two distinct servicing strategies (4-pipe FCU versus displacement with perimeter emitters) are carried in parallel through concept design and compared on comfort, energy, cost and space. Carrying options rather than committing early keeps the cheaper-to-change decisions open.
Carrying two competing servicing strategies through concept design rather than committing to one early is process discipline as much as engineering — it preserves the decisions that are cheapest to change and most expensive to unpick once drawings are issued. The specific comparison of a four-pipe fan coil scheme against displacement with perimeter emitters is a well-chosen pairing: they are genuinely different in energy performance, air quality, plant space, noise, and commissioning complexity, and the right answer depends on floor plate depth, occupancy pattern and client appetite for risk, none of which crystallise until concept stage is underway. The record's evidence state is claimed and no formal appraisal is documented here, so the value of this approach rests on the robustness of the evaluation criteria rather than on a validated outcome. The risk in parallel option work is that it remains superficially comparative — CAPEX and OPEX modelling must reach enough detail to discriminate, or the study ratifies a preference already held. A well-run option study should produce a single preferred route with documented reasoning before RIBA Stage 2 is complete; if it does not, it has shifted cost certainty into the next stage rather than resolved it.
#option study #concept design #decision