New Construction in Hacienda Heights
A new Hacienda Heights house with every wall-to-roof junction and yard grade drawn to move water away, plus an ADU placed on the same site plan.
A kickout flashing no bigger than a hand sits where a lower roof meets a second-floor wall, and it steers water into the gutter before it can find the siding. On a new Hacienda Heights house that small part is drawn, ordered and inspected like any other. The rest of the water plan, from leaders to yard grades to an ADU's own drains, follows the same logic.
From shingle to storm drain
Roof area and pitch set the gutter profile, and the number of leaders follows from how much roof each can serve. Leaders drop into solid pipe under the yard, and that pipe runs to a point where the county will accept the discharge. Roof-to-wall joints get step flashing, and headers over doors and windows get their own flashing before the weather barrier laps over it. Every layer sheds onto the one below, so a drop landing anywhere on the roof follows a continuous path down and out of the assembly.
At the base of the walls
Water that clears the roof still lands at the foundation, so finished grade is drawn to fall away from each wall, and patio and walkway slabs are pitched the same direction. The weather barrier runs down over the foundation edge, and the siding stops short of soil and paving. Where a slab meets a wall, a flexible sealed joint keeps runoff from slipping underneath. An ADU gets identical details, with its leaders tied into the main drainage line so both buildings share one reviewed route off the lot.
New Construction in Hacienda Heights: common questions
A second building is worth drawing now if county zoning permits one, because both roofs can then drain through a single designed system and the ADU's walls stay out of the main house's runoff. The zoning check comes first, and the unit is added only when the rules allow it.
Services are cut off and any old house is taken down under permit. Survey and soils work come next, then structural and energy design, then county review. Digging begins after approval, and the drainage plan is among the sheets the reviewer reads.
The house itself falls under California's building and energy codes, county zoning sets the buildable envelope, and drainage requirements decide how water may leave the parcel. Discharge onto a neighbor's lot is a problem the plans have to avoid, so the outlet is documented.
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