01
Find the connection before setting floor height
A field plan should identify the likely connection point, direction, depth, slope, cleanouts, obstacles, and how the route crosses patios, driveways, planting, or occupied areas.
Locate the likely private connection and obtain the City’s capacity response. A cleanout near the house does not establish depth or condition at the proposed unit.
02
Check slope across the whole run
A low backyard or distant connection can affect floor elevation and plumbing layout. A conversion may need more work than the nearest visible pipe suggests.
Measure elevations from the ADU fixtures to the connection. A low yard, long run, or obstacle can change the plumbing layout and finished floor.
03
Design cleanouts and access for future service
Put excavation, shoring if required, pipe, inspection, backfill, testing, surface repair, and landscaping restoration into the scope.
Place cleanouts where a plumber can reach them after landscaping and fences return. Avoid solving construction access while creating a maintenance problem.
04
Carry trench repair into the plumbing price
The sewer scope should include excavation, protection, pipe, inspection, testing, backfill, compaction, paving, irrigation, and planting repair where applicable.
City and state references
City and state pages behind the guidance
Use the agency material as the current starting point, then confirm how it applies to the property.
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Tell us what exists today, who will use the ADU, and which property issues concern you most.