Can a porta potty handle 6 months of a bathroom remodel in rainy Seattle?

A standard portable toilet with a holding tank is fine for a six-month Seattle remodel; it will handle the rain and duration. The key is the service frequency. Weekly service is the norm, but with a family of four and a crew, you will need service more often than once a week to prevent the unit from filling and becoming unpleasant. The gravel driveway is good for drainage and truck access. A deluxe flushing unit or restroom trailer is more comfortable but costs more to rent and service. A restroom trailer needs level ground, a fresh water source, and power from a generator or your house. For your crew size, check OSHA 1926.51: if you have 20 or fewer workers, one toilet is the minimum. Ask the rental company about their winter service policy. In freezing weather, they add antifreeze to the holding tank to prevent freezing, but flushing units and handwash stations can freeze and may be swapped out. Confirm the monthly rental rate includes all service visits and that there is no extra charge for a blocked unit on service day.

A standard unit on gravel got our family through a six-month bath remodel in wet weather. You do not need a deluxe flushing unit or a restroom trailer for a family of four plus a small crew if service keeps up.

The rain is less of a tank problem and more of an access problem. Ask whether winter service includes antifreeze in the holding tank, and what happens if the driveway is too soft for the vacuum truck after a multi-day storm. We kept plywood on hand for the truck path once the gravel edges got mushy. Weekly service frequency was the starting point; once the crew was on site all day we asked for a midweek pump so the unit never sat near full over a long wet stretch.

Confirm the monthly rate covers every scheduled pump-out, including extras you book when the crew is busy, and that you can request an emergency empty without a hassle. A trailer is nicer if you have power and a level pad, but for remodel duration a standard unit with solid service is the practical choice.