Guide
Often, yes, and the ranch house is the type owners ask me about by name. Los Angeles built them across whole tracts after the war: one story, a low roof, a wide footprint across the lot. That footprint is the ranch house's gift to a second story. The foundation and the roof framing are usually its two problems. This page covers both, and what the design does with the proportions.
I am Sebastian Moreno Rivera, the owner of Build And Decor Construction. What follows is what the evaluation usually finds on these houses; your house gets its own answer, in writing, after I have seen the footings.
Built in the 1940s and 1950s, in tracts, for a city growing fast: a single story under a low-pitched roof with wide eaves, a slab on grade or a raised foundation with a crawl space, stud walls, and a footprint that runs long across the lot. The plain tract version, the minimal traditional before it and the later split-level cousin share most of the same bones. They were built quickly and to the codes of their decade, which is the point of the evaluation.
A wide footprint gives a second story options a narrow house never has. A partial second story can sit over the rear or over one wing, set back from the front, so the street keeps the low ranch line and the new rooms look out over the yard. A full second floor is there where the lot's height limit and the family's needs call for it. The long exterior walls give the structural engineer room to place shear walls without rebuilding every opening downstairs.
Post-war houses often sit on shallow footings sized for one story. The engineer's answer is new footings doweled into the old ones where the new posts and shear walls land, grade beams where a line of posts needs them, and hold-downs tying the new shear walls to the foundation. The structural look exposes the footings first, because the drawings on file, when they exist, do not always say what is there.
The ceiling joists of a ranch house were sized to hold a ceiling and the attic above it. A bedroom floor is a different load, so the roof framing comes off and a floor system goes in, over or in place of the ceiling joists. Low plate heights downstairs decide where the stair lands and how the ceiling heights read on both floors, and that is settled in design, not in the field.
Set the second story back from the front. Keep the eave line at the street. Match the roof pitch and the siding or stucco texture, or repaint the full elevation when the existing color has faded, so the addition never reads as a box set on a house. Keep the stair inside the existing footprint. Run the new windows in the ranch's horizontal rhythm. A ranch house with a well-placed partial second story still reads as a ranch house from the sidewalk.
Many post-war tracts sit on flat lots, where the Baseline Mansionization Ordinance sets the floor area and the height. Some sit in the City's mapped Hillside Area, where the Baseline Hillside Ordinance sums the allowable floor area by slope band. Some sit in a Historic Preservation Overlay Zone, which adds a preservation review before plan check. I read every lot on ZIMAS before design, and the answer is in the feasibility read.
The structural look and the lot reading. Design and engineering. LADBS plan check. New footings and shear work below. The roof off under cover, in sections, each section framed and dried in the day it is opened. The new roof, windows and rough trades with their inspections. Finishes and the final inspection. The full picture is on the second-story additions page; the calendar is on how long a second-story addition takes; and the structural detail is on can your house carry a second story.
Send me your address and two or three photos of the house. I send back a feasibility read in writing: what the zoning allows above your roof, what the lot adds, what a house of its age and type usually needs to carry a new floor, and a simple massing sketch of the new floor on your house. I read every request myself.