01
Ranch houses south, apartments north
In ZIP 91364, the southern half, the median home was built in 1967, more than half come from the 1950s and 1960s, and about 74 percent are detached houses. In ZIP 91367, which includes Warner Center, the median year is 1975 and only about 40 percent are detached houses, with fewer than half owner occupied. Sources: US Census Bureau, ACS 2024 5-year, table B25034, ZCTA 91364. US Census Bureau, ACS 2024 5-year, table B25034, ZCTA 91367
In the southern ZIP, the work is mostly on houses that are around sixty years old, where the electrical, plumbing and windows can still be original. In the northern one, far more of it is inside condos and townhomes. A home addition is a natural goal where a detached house sits on its own lot.
For a condo in Warner Center, the association's rules on noise, elevators and parking shape the schedule as much as the scope does, so we read them first.
02
Several specific plans
Warner Center has its own specific plan, and points we checked on Oxnard Street and Burbank Boulevard sit inside it. A point on Canoga Avenue falls in the Girard Tract Specific Plan, effective July 18, 1989, which sets development standards for hillside lots, including those on substandard hillside streets. Ventura Boulevard carries a corridor plan too.
Up top, a point we checked on Topanga Canyon Boulevard falls in the outer corridor of the Mulholland Scenic Parkway Specific Plan, where design review comes before any building or grading permit. Each plan is checked for the parcel before drawings start, because each one can change what an addition is allowed to look like.
On a substandard hillside street, access for trucks and materials is part of the plan, and deliveries are sized for the road the house actually sits on.
Sources: Girard Tract Specific Plan, Ordinance 165,040, effective July 18, 1989. Mulholland Scenic Parkway Specific Plan, Section 11
03
Ground and two fire maps
Eleven of the thirteen Woodland Hills points we checked sit in a state liquefaction zone, most on the Canoga Park quadrangle. CAL FIRE's 2025 map marks the points on Mulholland Drive and upper Topanga Canyon Boulevard Very High, and two more points come back High.
The City's own map reaches further in places. It includes flat points on Winnetka Avenue and Serrania Avenue that the state map leaves outside the wildland classes. The City can add to the state map but not lower it, so we plan an exterior for the stricter of the two, and the estimate says which map drove the choice.
The state's EQ Zapp viewer shows the ground zones for a single address, and the City's map shows its fire zone. We check both at the first visit.
Sources: California Geological Survey, Seismic Hazard Zones, liquefaction layer, Canoga Park quadrangle 1998. City of Los Angeles, Very High Fire Hazard Severity Zones layer
04
Which city is it, and where to start
A test address on Mulholland Highway with a Woodland Hills mailing name geocodes inside the City of Calabasas. That means a different building department, a different set of oak rules and a different permit counter, so we confirm the city before anything else. A set drawn for the wrong city is a set drawn twice.
Inside Los Angeles, permits run through the City. Projects here often start with a kitchen remodel or outdoor space, and each one begins with the parcel, the plans that apply to it, and a written scope with a fixed price, all before the first day of work.
Send the address before the visit, and we confirm the city from the county's parcel data, which settles the question before anyone draws a line.
