North Hills ADU Construction, Roof and Runoff First
North Hills ADU construction with the roof sized for its runoff, downspouts routed on the site plan and four ADU types compared on your lot.
Roof area sets how much water a North Hills ADU has to move in a hard storm, and from that figure we size the gutters and count the downspouts. A simple gable splits the load between two eaves. A single slope gathers it all along one edge, which calls for a larger gutter and more outlets. We settle the roof form early, because it fixes the unit's height and decides where every downspout lands on the site plan.
Getting the water off the lot
Each downspout needs a place to discharge that keeps water away from the new footings and off the neighbor's side. Options include a splash block on graded soil, a buried pipe to a gravel dry well, or a line to the street curb where the city permits a curb drain. The soil next to the walls is shaped to carry water away from the unit. LADBS reads that drainage path on the site plan, and the inspector looks at it again before the final. Gutter guards keep leaves from clogging the outlets between storms.
Roof plans for each ADU type
A detached unit has a roof of its own, so its gutters and outlets are designed from scratch. Where an attached unit joins the house roof, the junction gets step flashing, a cricket where water would pond, and gutters sized for the extra area draining into them. A garage conversion holds on to its roof when the rafters and sheathing are sound, with new gutters added. A JADU adds no roof at all. A pale roof color also cuts heat gain on an inland lot under hard sun, and we note that in the comparison too.
ADU Construction in North Hills: common questions
We measure the parcel before naming a type. A rear yard clear of the setbacks suits a detached unit, a long free house wall suits an attached one, a sound garage suits a conversion, and one room of the house that can take an outside door suits a JADU. More than one may fit, and we compare them side by side.
Plan review for a North Hills ADU happens at LADBS, where the state's ADU rules and city zoning set the limits. On a detached unit we expect the reviewer to spend time on the site plan with its drainage arrows and on the roof framing sheet. We file the set, reply to each written comment and resubmit until approval.
Yes. In North Hills, as anywhere in the City of Los Angeles, state ADU law means a converted garage brings no duty to add parking. The garage itself still has to pass: a slab without major cracks, studs that can hold insulation, and a roof whose gutters and flashing are sound or replaced.
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