Quick answer: with nonintervention powers, no — the sale needs no court order at all. Without them, the sale runs through Washington's supervised process instead. Run your own numbers in the Washington probate real estate sale calculator.
A mandatory grant, not a judge's favor
What that authority actually covers
A PR with nonintervention powers can borrow against the estate's credit and mortgage, encumber, lease, sell, exchange, or convey estate property — both real and personal — exercising powers comparable to a trustee's under Washington's trust statutes, all without notice, approval, or court confirmation of any kind.
The court still shows up eventually
Nonintervention doesn't mean the court disappears forever. To close the estate, the PR files a declaration of completion, or petitions for a decree confirming the final accounting and the fees paid. Any heir or beneficiary whose share those fees would reduce receives notice and can ask the court to weigh in on whether they're reasonable — the one real checkpoint in an otherwise hands-off process.
When the will itself says no
A will can specifically direct that nonintervention powers not be granted, even where the estate would otherwise qualify — keeping the administration, and any real estate sale, under full court supervision under RCW 11.56 instead.
A local probate attorney can review your estate — many offer a free consultation.
Whether the case sits in King, Pierce, Snohomish, or Spokane County, the same statutory framework applies statewide.