01
Name the rooms before naming the benches
EudraLex Volume 4, Chapter 3, normally separates quality-control laboratories from production. Biological, microbiological, and radioisotope control should be separated from each other as well. Control rooms need enough space to avoid mix-ups and cross-contamination, plus storage for samples and records. An open floor labeled “QC” does not record that. Draw the rooms, even when two are only defined areas inside one suite.
U.S. 21 CFR 211.42 requires drug buildings to be sized and built for cleaning, maintenance, and proper operations, with a flow that prevents mix-ups and contamination. Control and laboratory operations need a separate or defined area, or another system that prevents mix-ups. Penicillin operations for human drugs stay in facilities apart from other human drugs. If this laboratory supports penicillin, it is not a second bench row in general QC. If it does not, do not borrow that rule to justify an empty room. Both the EU chapter and the WHO guide keep rest rooms out of the laboratory.
02
Ask whether the surface touches the drug
21 CFR 211.63 says drug-processing equipment must be the right design and size, and located for its use and for cleaning. 21 CFR 211.65 then covers surfaces that touch components, in-process materials, or drug product: they must not be reactive, additive, or absorptive so as to change the drug beyond official or other established requirements. A balance table that never touches product is not automatically that surface. A sampling bench that does may be. Say which case each top is.
Where aseptic processing is in scope, 211.42 calls for smooth, hard, easily cleanable floors, walls, and ceilings, plus temperature, humidity, filtered air, and a cleaning system. That list is not for every chemistry bench in a QC suite. EU Chapter 3 uses a related test where starting materials, primary packaging, or bulk product are exposed: surfaces should be smooth, free of cracks and open joints, non-shedding, and easy to clean and, where needed, to disinfect. Apply it only to rooms the quality unit places in that class. Elsewhere, name the cleaners already chosen and compare them with the construction offered. That comparison is still open.
03
Give sensitive instruments a room, not only a heavier top
EU Chapter 3 notes that separate rooms may be needed to protect sensitive instruments from vibration, electrical interference, or humidity. A thick top can be part of a weighing station. It does not replace the room if the disturbance is the corridor, the elevator, or a shared panel. WHO adds that lighting, energy, temperature, humidity, and air pressure must suit the work and be monitored so they do not invalidate results. Reserve a quiet address. The limits stay in the laboratory’s own procedures.
Highly toxic work, including genotoxic substances, is another address. WHO calls for special precautions and, where necessary, a dedicated unit such as an isolator or a laminar-flow work bench, with procedures against exposure and contamination. Microbiological testing, if it is in scope, belongs in a unit designed for it. In vivo tests, if they are in scope, move the animal house away from other rooms, with its own entrance and air handling. Do not cover those duties with an ordinary bench just because floor space remains. If they are out of scope, say so, and do not draw the isolator for later.
04
Count benches, stations, and enclosures apart
WHO’s premises section expects adequate instruments, and it names work benches, work stations, and exhausted enclosures as examples. That sentence has no lengths and no face velocity. Use it as a counting rule: a bench for prepared samples, a weighing station with the clearances already published for that instrument, and an enclosure only where the risk review assigned one. Three lines, not one lot called lab furniture.
EU Chapter 3 also says equipment should be located for its purpose and designed so it can be cleaned thoroughly. A fixed run that blocks the floor behind it fights that sentence. A movable table fights it if the services cannot be disconnected. Mark what stays fixed because a drain or a gas outlet requires it, and what must move so the floor can be cleaned. 21 CFR 211.63 asks for the same thing: equipment located for use and for cleaning. A full-looking layout is not automatically a cleanable one.
05
Send the factory only the cells a drawing can hold
A factory can compare decisions already made: the room list, each bench length, knee space at a named instrument, whether that room has a sink, and a surface category chosen for a named cleaner. It can say whether a piece is fixed or movable. It cannot decide that the result meets WHO quality-control practice, 21 CFR 211, or EU GMP. Those judgments stay with the quality unit. A blank cell is more useful than a finish name.
The package should still show the separations: QC apart from production where the guidance says so, microbiology apart from chemistry where both exist, penicillin apart if it is in scope, and sensitive instruments in a room that names the disturbance it avoids. Open cells include any cleaner not yet named, any enclosure the risk review has not confirmed, and any surface whose product contact is still uncertain. Selection is finished when owners fill those cells or leave them visibly open.
When the plan is ready for a factory review, send the quantities, hazards, and unresolved room limits to a laboratory furniture manufacturer in China. Open items should stay open rather than being written as a confirmed specification.