01
The post war ranch house, sixty years on
In the Granada Hills ZIP code the median home was built in 1963. About 84 percent predate 1980, and more than 62 percent come from the 1950s and 1960s alone, with the 1950s the largest decade. About 83 percent are detached houses, and close to three quarters are owner occupied. Source: US Census Bureau, ACS 2024 5-year, table B25034, ZCTA 91344
A house that has stood for sixty years has usually been repaired many times, and a remodel starts by finding out which earlier work was permitted and inspected and which was not. That is why a whole home renovation is often the honest scope here, and why we open a wall before we promise a finish. Older electrical panels and plumbing are priced into that scope, not discovered after it.
02
A specific plan on the flats
Granada Hills has its own specific plan, adopted by City ordinance and amended since, and the City's planning map lays it over parts of the flat neighborhood we checked, including points on Chatsworth Street, Balboa Boulevard, Woodley Avenue and San Fernando Mission Boulevard. It sits on top of the ordinary zoning. Source: Los Angeles City Planning, Granada Hills Specific Plan
A specific plan can add its own standards, so we read it for the actual parcel before drawings begin. Permits for every Granada Hills address go to the City of Los Angeles, and a lot inside the plan gets that extra check at the start, not at plan check. Finding it early keeps a design from being redrawn after the first review comes back.
If you have the original plans or old permit cards, bring them. On a sixty year old house they are rare, and they save hours of guessing about what sits inside the walls.
03
Ground on Balboa, faults in the hills
State seismic hazard maps on the Oat Mountain quadrangle, released in February 1998, place both points we checked on Balboa Boulevard inside a liquefaction zone. The state exempts a single family frame house of up to two stories from its soils report requirement, but the City can still ask for one, so we raise it before design.
Up on Sesnon Boulevard the picture changes again. That point sits in a state earthquake fault zone as well as a liquefaction zone, and it is Very High on CAL FIRE's 2025 map. A hillside addition up there begins with the parcel lookup and a geologist's input, well before anyone picks a floor plan.
The state's EQ Zapp viewer shows both kinds of zone for a single address. We run it for every Granada Hills project that adds square footage.
Sources: California Geological Survey, Seismic Hazard Zones, liquefaction layer, Oat Mountain quadrangle 1998. California Geological Survey, Alquist-Priolo fault zone layer
04
The north end and where to start
Points we checked on Zelzah Avenue and Longacre Avenue sit in the City's hillside area, in a K horse keeping district, and in both the City's and CAL FIRE's Very High fire zones at once. A project there carries hillside, animal keeping and wildfire rules together, and each one affects the drawings.
On the flats the work is simpler and the house is older. A bathroom remodel or new flooring is a common first project, and the floor underneath is checked for level before anything is laid. We check the specific plan, the hillside map and the fire map for the address before the scope is written.
On a horse property, stables, arenas and trails are part of the site plan, so an addition is placed where it leaves those working.
Sources: City of Los Angeles, Hillside Ordinance area layer. City of Los Angeles, Very High Fire Hazard Severity Zones layer
