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Stability Storage: Buy or Rent?

Stability Storage: Buy or Rent?

By Clay Hile, Parameter Generation & Control, Inc.

When a company is evaluating whether to buy a stability storage room or chamber – or lease space – there are several factors to consider.

Operating on-site stability storage includes expenses other than the purchase of a room or chamber. Additional expenses include:

  • Cost of validation for the conditions required.
  • Yearly calibration of temperature and humidity sensors.
  • Back-up space in the event the main chamber goes out of specification or breaks down.
  • Back-up generator to supply electricity to the stability area in the event of a power disruption.
  • Initial extension and ongoing service costs of required utilities – water, drain, and power.
  • Personnel to help monitor chamber and conduct performance maintenance.

Several factors should be considered when deciding whether to rent shelf space for stability storage or to purchase an on-site chamber or room. These factors include:

  • Amount of product requiring storage.
  • Length of time storage is required.
  • Condition (temperature and RH) required according to ICH.
  • Back-up contingencies.

The study’s duration, the amount of space required and necessary environmental conditions can be related. For example, a company may have several chambers operating at 25/60 that could accommodate a small study for a specific length of time. But if the study requires uncommon conditions – such as 25/40 or 30/75 – the company may not have chambers operating at these conditions, so tapping existing excess space is not an option. At that point, the company needs to compare the total expense of purchasing an additional chamber versus the cost of renting space.

Renting stability storage space may not be as convenient as owning when it comes to pulling and testing samples. Companies renting stability storage should establish appropriate ship dates for samples taken from specific lots when signing a contract.

Some companies choose to store larger quantities of product off site and keep only the quantities required for scheduled pulls on site. This keeps on-site storage at a manageable level while providing the convenience of readily available samples.

A main benefit of renting stability storage is that fact that expenses can be spread across the duration of the study as compared to buying stability storage, which requires an upfront capital investment. Attached is a chart highlighting savings realized using off-site stability storage.


Serving the pharmaceutical, food & beverage, textile and other industries, Parameter specializes in humidity control and conditioning systems, stability chambers that meet ICH guidelines, TAPPI rooms and large capacity baths and chillers. We also offer FDA compliant off-site storage and equipment validation services. View our full line at