Scope, not skill
Differences between quoted fee tiers usually reflect how far the representation goes, not the quality of the attorney. A lower number often means the engagement ends at a negotiated plea.

A line-by-line look at what Washington DUI flat fees usually include, where the license hearing and trial sit, and which costs arrive separately.
Two attorneys can quote what sounds like the same number for the same arrest and mean genuinely different things by it, because a flat fee is not a price for a case, it is a price for a defined block of work, and the definition is where all the variation lives. One quote may carry the case from arraignment through a negotiated resolution and stop there. Another may include the Department of Licensing hearing, an expert review of the breath instrument, and a first day of trial. The dollar figures tell you almost nothing until you know the boundaries around them.
Washington DUI defense generally sorts into a few rough tiers, and the tiers correspond to scope rather than to skill. The lowest band usually covers appearance, discovery review, negotiation with the city or county prosecutor, and a plea or dismissal, which is the path most first-offense cases without an accident actually take. A middle band adds motion practice: a suppression hearing on the stop, the field sobriety testing, or the implied consent warnings, which is real litigation and real hours. The upper band contemplates a contested case with expert involvement and a jury. When a quote is unusually low, the honest explanation is almost always that it stops earlier, not that the work is cheaper.
The administrative case runs on its own track and its own clock, and whether it is inside the flat fee is the single most consequential line item to confirm in writing. Some offices fold it in and treat it as part of the same representation. Others quote it separately, often as a distinct engagement with its own fee, because the hearing involves a separate filing, a separate record, and a separate hearing officer who has nothing to do with the criminal court. Neither approach is wrong. What matters is that you know which one you bought before the deadline passes, since a hearing nobody was retained to request is a hearing that does not happen.
Most flat fee agreements name a trigger point at which an additional fee becomes due, and the trigger is usually the decision to set the case for trial or the confirmation date shortly before it. That is reasonable pricing, because trial preparation is a different order of work: subpoenas, witness interviews, jury instructions, motions in limine, and days of courtroom time that cannot be scheduled around anything else. The question to ask is not whether a second fee exists but what number it is, when it is quoted, and whether it is fixed or estimated. A written agreement that names the trial fee at signing removes the worst version of this conversation, which is having it in the week before a jury is called.
Legal fees are one column, and the case has several others that no attorney controls. A defense expert to review breath test maintenance records or blood analysis is billed by the expert, not the office. An alcohol and drug evaluation, required in most resolutions, is paid to the treatment agency. If an ignition interlock is ordered or required for a license, there is installation, monthly leasing, and calibration, and those continue for as long as the requirement does. Probation supervision carries its own monthly cost, court costs and assessments attach to the judgment, and the National Highway Traffic Safety Administration oversees the federal framework these state requirements sit inside. Asking for the whole picture in one sitting is the only way to see it.
Ask each office the same short set and write the answers down. Does the fee include the license hearing, and if not, what is that fee. What is the trial fee, and what event triggers it. Are suppression motions inside the quoted number or billed separately. Which costs will I pay to somebody other than you, and roughly when do they arrive. Is any part of the fee refundable if the case resolves at the first hearing. Once you have five answers from two offices, the comparison becomes arithmetic rather than impression, and the higher number frequently turns out to be the one that includes more of the work you were going to need anyway.
The useful document is the fee agreement, not the phone call, and a careful reader reads it before signing rather than after the first invoice arrives. Any office comfortable with its own pricing will hand it over early and walk through the boundaries without being pushed.