Yes, all wood products will slightly change dimensions with changes in relative humidity. Cabinet doors are no exception to this humidity change rule. Here is a brief summary of why wood changes, and what you should expect from your doors.. Any wood product, with a moisture content of about 7% (normal for wood products inside a home) will be at equilibrium (not take-on or give-off moisture) when the relative humidity is 30%. The change in door dimensions occur when the relative humidity varies from the average 30%. If the humidity goes down the dimensional change to the door will be minimal and most likely will go unnoticed. If the humidity increases up to 40% or even 50%, the change will also be minimal. When you experience humidity levels over 70% changes in door dimensions will occur and the extent of the changes will depend upon the length of time the humidity stays at the high levels. A properly finished cabinet door will react slowly to higher humidity, but within a few weeks of high humidity the door will stabilize at the higher humidity and it’s width expansion will be completed. The width of the fully humidity-expanded door (with slight differences between wood types) will be between 1/32-inch and 1/16-inch wider than the width at 30% relative humidity. Length expansion, because of wood grain structure, will not be noticeable.