Can an estate trustee be held personally liable if a delayed property sale causes the estate to lose value?

Potentially, yes, though it depends on whether the delay was unreasonable in the circumstances rather than simply the result of normal estate administration taking time. Estate trustees owe a duty to administer the estate with reasonable diligence, and courts generally look at whether the trustee acted as a reasonably prudent person would have, considering things like the time needed to obtain a Certificate of Appointment, arrange a proper marketing process, and deal with any complications, rather than expecting an unrealistically fast sale.

Where a delay goes beyond what's reasonably explainable — for example, a trustee sitting on a deteriorating or heavily depreciating property without good reason, or failing to act despite clear warning signs — a beneficiary can potentially pursue a claim that the trustee breached their duty and should be held personally responsible for the resulting loss in value. This is not an automatic outcome just because a property's value dropped during the administration period, since market conditions and reasonable process delays are not, on their own, evidence of fault. Because these cases turn heavily on the specific facts and timeline, a beneficiary concerned about a trustee's inaction, or a trustee worried about exposure from delay, should get legal advice on the specific situation rather than assuming either way.