Things to consider when designing a Tenant Fit-Out:

• It is critical to verify: existing ductwork, air device sizes and locations, duct elevations, and duct locations.
• If a hydronic system; you must determine existing pipe sizes, valve locations, pipe locations, pipe inverts, etc.
• Verify plumbing piping sizes, inverts, valve locations.
• Verify existing HVAC and plumbing equipment locations, nameplate data, size, capacity, etc.
• Verify electrical raceways, wire troughs, data cables and wiring; confirming any electrical item that could require relocating or avoiding based on new work.  All abandoned cables and wiring not being re-used must be demolished.  In medical facilities, all existing cabling intended for re-use must be confirmed to be hospital grade quality.  If not, then it can't be re-used.
• Have you considered how your work will affect other building occupants and their HVAC, plumbing and electrical systems? i.e., sanitary piping or ceiling space of floor below; shared HVAC units, thermostats, etc.
• Have you considered work scheduling; i.e., night work to minimize building occupant's disruptions?
• Have you taken the time to determine whether your tenant fit-out modifications will impact the performance of existing HVAC equipment i.e.: pumps, AHLU's or plumbing equipment, i.e.: domestic water pumps, water heaters, etc.
• Have you verified above ceiling structure? i.e., have you determined steel joists, and IBeams locations, sizes, centerline dimensions, inverts above ceilings, etc.