Cleanroom validation services:
how to compare quotations

Cleanroom validation services are difficult to compare when each provider has interpreted the enquiry differently. One may price particle classification and HEPA filter integrity tests only. Another may include airflow, pressure, recovery, temperature, humidity and a detailed report pack. Both can appear to offer “full validation”.

Start with the intended outcome, not a generic test list

The right validation scope depends on what the facility does and which requirements govern it. A non-sterile medical device assembly room, an aseptic pharmacy suite and a precision engineering cleanroom do not automatically need the same evidence. State the process, product exposure, classification target, pressure regime and applicable quality framework in the enquiry.

Also define whether the work is initial qualification, periodic requalification, testing after modification or investigation of a performance concern. The objective affects the test plan. Replacing filters, changing the HVAC controls or moving process equipment may require targeted checks as well as routine classification.

Room status matters. ISO 14644-3:2019 describes performance tests across as-built, at-rest and operational occupancy states. A result obtained in an empty, completed room does not demonstrate how the environment performs with its normal equipment and people present. The quotation should name the state for each test rather than leave it implied.

Compare the test schedule and methods line by line

Ask each provider to return a test schedule against the same room list. It should show the method, number of locations or devices, acceptance criterion and estimated duration. That exposes important differences which a single “day rate plus report” cannot show.

Airborne particle classification should be tied to the required ISO class, particle sizes, sampling locations and occupancy state. ISO 14644-1:2015 classifies air cleanliness by particle concentration using readings at designated sampling locations. It does not, by itself, classify viable contamination or the chemical nature of particles.

Other tests might include installed filter system leakage, airflow volume or velocity, pressure differentials, airflow direction, recovery time and environmental conditions. Inclusion must follow the user requirement and risk assessment. If the facility manufactures sterile medicinal products, the scope also needs to reflect the cleanroom qualification expectations in EU GMP Annex 1; an ISO particle count alone is not a complete qualification programme.

Look closely at HEPA terminology. An installed filter system leakage test is concerned with leakage through the filter, frame, housing or seal. It is not interchangeable with an airflow reading or a manufacturer's filter certificate. Our guide to HEPA filter validation explains what the test should prove.

Check competence, instruments and accreditation claims

A credible quotation identifies who will carry out the work, the methods they will use and the instruments they intend to bring. Ask how technicians are trained and authorised for each activity. Where access equipment, aerosol challenge materials or production-area controls are involved, responsibilities for permits, safety assessments and site supervision should be clear before attendance.

Instrument lists should include the type of equipment needed for the agreed tests, with current calibration traceable to suitable standards. Confirm whether calibration certificates will be supplied in the final pack and whether any instrument limitations affect the measurement range or result.

Accreditation needs precise wording. If UKAS accreditation is a project requirement, obtain the provider's current schedule and check that the relevant test and method sit within its accredited scope. A company-level accreditation logo does not prove that every service it sells is accredited. The UKAS directory is the appropriate place to verify an organisation and its published scope.

Specify the report before the visit

The report is the lasting deliverable, so its contents should not be an afterthought. Request an approved protocol or test plan, identified rooms and devices, referenced methods, acceptance criteria, instrument details, calibration status, results, deviations and an authorised conclusion. Raw or traceable readings should be available where the quality system requires them.

Agree how failures will be handled. The provider should record the original result, notify the nominated contact and distinguish investigation or remedial work from retesting. A clean replacement certificate with no account of the initial failure weakens the audit trail.

Turnaround time can also change the value of a quotation. Establish when draft and final reports will arrive, who reviews corrections and whether electronic records use controlled approval. If your internal quality team needs a particular template or document numbering convention, share it with all bidders.

Find the commercial exclusions

Validation work is sensitive to site readiness. Quotations should state assumptions about room availability, HVAC stability, cleaning, access, isolations, escorts and working hours. Clarify whether travel, accommodation, weekend attendance, consumables, access equipment, repeat visits and retests are included.

Programme risk deserves attention too. Ask what happens if the room is unavailable, construction is incomplete or the HVAC system has not been balanced. A provider may reasonably charge for lost attendance, but the basis should be visible before appointment.

For a new facility, coordinate validation with commissioning rather than booking it as a detached final task. Air balancing data, filter schedules, approved drawings and controls commissioning records should be ready for review. The distinction between commissioning and qualification responsibilities must be written into the project plan.

Seven questions to put to every provider

1. What exactly is included? Request a room-by-room test schedule, not a general service description.
2. Which requirement sets the acceptance criterion? Ask for the standard, specification or approved protocol reference.
3. In which occupancy state will each test be performed? Record as-built, at-rest or operational explicitly.
4. Who will perform and authorise the work? Confirm competence, supervision and report approval arrangements.
5. Which instruments will be used? Check suitability, calibration status and supporting certificates.
6. What happens after a failure? Agree notification, investigation, remedial work and retest charging.
7. What is excluded? Review access, travel, consumables, reporting, return visits and out-of-hours work.

Sending the same information to each bidder gives you a defensible comparison and reduces late additions. If the scope is still uncertain, use the first conversation to develop it before asking for a fixed price. The broader cleanroom validation guide is a useful starting point for assembling the technical brief.