ADU Construction in Mission Hills, Grounded Right
ADU construction in Mission Hills that starts by tracing roof runoff, with a graded pad, a drained slab edge, hardened walls and LADBS plan review.
We trace each downspout on the main house to its outlet before sketching anything for a Mission Hills unit. A new slab set where roof water already spreads would sit in wet ground after each storm, so we mark those outlets, note where the yard holds puddles and choose a pad that drains. The same walk shows where a hard, noncombustible strip around the new walls can go without trapping water against them.
Shaping the pad so water leaves
The ground around the unit has to fall away from its walls on every side, and the main house's downspouts may need new outlets that carry water past the new slab. Where the pad sits lower than the yard around it, a shallow swale or a perforated drain in gravel catches runoff before it reaches the footing. The slab edge stays a few inches above finished grade so the bottom of the wall finish stays dry. A metal screed at that edge lets moisture escape from behind cement plaster without wicking upward.
Permit review with the city
Grading and drainage notes travel with the drawings to LADBS, the Los Angeles Department of Building and Safety, which handles permits for Mission Hills and checks how the pad is graded before footings are dug. Hardened assemblies can go on the unit whatever the state fire map shows for the parcel: cement plaster walls, screened vents and tempered glass. We list each one on the quote with its own figure, and the drawings name every product, so a question during review has an answer already on the page.
ADU Construction in Mission Hills: common questions
Only when the state hazard map includes the parcel, which we check for your Mission Hills address before design. If it falls outside the mapped zones, LADBS will not require the wildfire assemblies, though they can still be built into the unit. Screened vents, tempered glazing and a plaster finish are each priced separately, so each can be weighed by itself.
Drawings that take a qualifying one-story unit through permit. Drainage gets drawn on the site plan for Mission Hills: how the pad is graded, where each downspout ends and the distance from the slab to each property line. Units that grow past the size limit or to a second level are quoted separately.
Two projects on one Mission Hills lot can move through LADBS at the same time once each drawing set is complete and the yard can hold both jobs. Grading the unit's pad while the house site is open saves bringing equipment back. Finishing the unit first means a home on the property during the rest of the rebuild.
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Plan your project in Mission Hills
Tell us about the house and the adu construction work. We reply about a walk-through and a written scope.