Parenting Plan & Custody Modification Attorney

Parents are often surprised by how high this bar is. The reason is stability: Washington law starts from the premise that children benefit from consistency, and that re-litigating the schedule every time a parent is unhappy causes real harm.

That does not mean plans are permanent. Circumstances genuinely change — a parent relocates, a schedule that suited a toddler no longer suits a teenager, or something in the other household becomes unsafe. The law provides for those situations; it just requires more than dissatisfaction.

We handle modifications on both sides: for parents seeking a change, and for parents defending a plan that is working.

How does the modification process work?

Step one: adequate cause

Before a modification case proceeds, the moving parent must show adequate cause through sworn declarations containing specific facts. This gatekeeping step exists to filter out weak petitions, and bare allegations will not survive it. Many modification attempts end here.

Step two: the merits

If adequate cause is found, the court then determines whether the statutory standard is met — generally a substantial change in the circumstances of the child or the non-moving parent, arising from facts that occurred since the last order or were unknown to the court, with modification being in and necessary to serve the child's best interests.

One detail catches people off guard: for a major modification, a change in the circumstances of the parent asking for the change is generally not enough. The change usually has to be in the child's circumstances or the other parent's.

What is the difference between a major and a minor modification?

The bar depends on what you are asking for. Changing which parent the child primarily lives with is a major modification and carries the highest burden — typically requiring that the current environment is detrimental to the child. Smaller adjustments to the residential schedule face a lower standard, though statute limits how often and how much they can be changed. Adjusting non-residential provisions, such as dispute resolution or transportation, is easier still.

Every route except relocation must first clear the adequate cause threshold, which is decided on sworn declarations containing specific facts.

What counts as a substantial change in circumstances?

Often sufficient

• A parent's relocation that makes the current schedule unworkable
• Substance abuse or a mental health crisis affecting a parent's ability to care for the child
• Domestic violence, abuse, or neglect discovered after the last order
• A parent effectively abandoning the schedule or repeatedly failing to exercise their time
• A conviction for custodial interference, which statute treats as a substantial change
• A child's significantly changed developmental or medical needs

Usually not sufficient on its own

• Ordinary co-parenting conflict and poor communication
• A new partner or remarriage in the other household you dislike
• A teenager saying they would rather live with you
• Disagreements about discipline, screen time, or household rules
• The moving parent's own improved circumstances
• Military deployment by itself, which cannot justify a permanent change

What happens if a parent wants to move with the child?

When a parent intends to move with a child, Washington's relocation statutes apply instead of the ordinary modification analysis. The relocating parent must give written notice — generally sixty days in advance — including the new address and a proposed revised schedule, and the other parent has a limited window, typically thirty days, to object. If a relocation request is properly pending, the adequate cause hurdle does not separately apply. There is a rebuttable presumption that a parent with whom the child resides a majority of the time may relocate, which the objecting parent must overcome by addressing the statutory factors.

Moving first and asking later is the mistake to avoid. Relocating without complying with the notice requirements can result in an order returning the child, and it damages credibility for the rest of the case.

Is modifying child support different from modifying a parenting plan?

Support modification follows its own rules and a considerably lower bar than a parenting plan change — a substantial change in circumstances, or the passage of time since the order was entered. Note too that Washington's child support schedule changed substantially on January 1, 2026, which may itself justify recalculating an older order.

What should I do before filing to modify a parenting plan?

• Document specifics — dates, times, messages, missed exchanges, incidents
• Try the dispute resolution process in your plan first; courts expect it, and skipping it can cost you fees
• Keep following the current order exactly while the petition is pending
• Be realistic about the burden — an unsuccessful petition can result in attorney fees against you if it was filed in bad faith
• Consider whether an agreed modification is possible; agreed changes avoid both the adequate cause hurdle and the cost

Frequently asked questions