ADUs and additions, Stevenson Ranch, Los Angeles County

ADU Construction in Stevenson Ranch

How an ADU job in Stevenson Ranch is planned, which office reviews it next to the nearby cities, and the ember details a mapped lot may call for.

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One planning routine covers a Stevenson Ranch parcel and the places around it: Santa Clarita, Porter Ranch, Sylmar, Granada Hills, Chatsworth and San Fernando. Each job opens with a feasibility check of the lot against state ADU law and the rules of the agency in charge, then sets detached, attached, garage conversion and JADU options beside each other on one drawing. What shifts from place to place is the office that issues the permit and the details its reviewers expect.

Which office takes the submittal

Stevenson Ranch is unincorporated, so Los Angeles County handles building review for addresses there. Santa Clarita and San Fernando are cities that run plan check of their own. Porter Ranch, Sylmar, Granada Hills and Chatsworth are communities within the City of Los Angeles, where LADBS receives the plans. The parcel record tells us which jurisdiction applies before design work begins, since setbacks, height limits and submittal forms follow whichever agency holds the address. The side by side comparison of unit types is then drawn to the standards that govern that particular lot.

Ember-resistant choices on the unit

Some ground in Stevenson Ranch is mapped for fire hazard, and a unit placed on that land may have to meet ember-resistance requirements. When they govern the lot, our plans specify vents with fine mesh or baffles that keep embers out, a Class A rated roof, noncombustible siding close to grade and tempered glass in the windows. A garage conversion can need upgrades to an older roof and open eaves to reach the same standard. Each of these items is listed in the feasibility study, so every unit type is weighed with its full exterior scope in view.

What we build in Stevenson Ranch

Second units and room additions lead, with the rest of our services available on the same lot.

Cities close by

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