Published September 28, 2025
During the 1960s and 1970s, Tri-Valley builders repeatedly returned to a similar idea: a house could give different parts of family life their own space. Formal living and dining rooms occupied the front of the house, kitchens and family rooms formed the center of everyday activity, and bedrooms were gathered into a more private wing.
The arrangement varied from builder to builder, but the underlying division was remarkably consistent. It reflected a period when suburban families wanted both informal spaces for daily life and more formal rooms for entertaining—and when the relatively generous lots of new Tri-Valley developments gave builders room to accommodate both.
These floor plans weren't identical, and they weren't the only way to design a suburban house. But from Dublin and San Ramon to Pleasanton and Livermore, the same basic organization appeared again and again.
Dividing the house into zones
During the 1960s, housing designers increasingly looked for ways to give different parts of family life their own space. Formal entertaining called for rooms that could be kept separate from the everyday activity of the household, while kitchens, family rooms, and children's areas were increasingly connected to one another. Bedrooms, meanwhile, were often grouped together to provide greater privacy.
The Tri-Valley examples show how those ideas translated into tract housing. The details changed from one builder to another, but the basic pattern remained familiar: formal rooms near the entrance, informal family spaces deeper inside the house, and bedrooms positioned away from the main flow of visitors.
That division did not mean the houses were completely closed off. The kitchen and family areas were often closely connected, creating a more informal center for daily life, while the formal rooms and bedroom areas retained clearer boundaries. The result was a house organized around different kinds of activity rather than a single undifferentiated living space.
An early example: Duc & Elliot's Mount Diablo
At Villa de San Ramon in Dublin, Duc & Elliot's Mount Diablo model offers an early Tri-Valley example of this approach. Introduced in 1965, the 1,740-square-foot, four-bedroom house divided the home into distinct areas without making any one of them feel isolated.
The living and dining rooms occupied the front of the house, close to the entry and suited to more formal entertaining. Beyond them, the kitchen and family-oriented spaces formed the everyday heart of the home. The bedrooms were grouped together in a separate wing, with the primary bedroom positioned toward the rear.
That arrangement gave the house a useful separation between public and private life. A visitor could enter the formal part of the house without immediately passing through the family's private spaces, while the kitchen and family areas remained connected to the parts of the house where daily life took place.
It was a practical arrangement for the period: one house could accommodate both the formal entertaining expected of a suburban home and the less formal routines of family life.
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| The Mount Diablo model by Duc & Elliot at Villa de San Ramon, introduced in 1965. |
Refining the formula: Kay Homes
A year later, Kay Homes used a similar arrangement at Rancho Solano in San Ramon, but with more attention to flexibility within the basic plan. Plan 424, introduced in 1966, provided 1,795 square feet with four bedrooms and two bathrooms.
As with the Mount Diablo, the formal living and dining rooms were positioned near the entry, while the kitchen, breakfast area, and family room formed a more informal zone toward the rear. The bedrooms occupied their own wing, separated from the main entertaining spaces.
Kay Homes also gave the plan a more distinctive primary suite. A sunken sitting area created a separate space within the suite, turning the bedroom into something more than simply a place to sleep. It was a small example of the period's growing interest in giving homeowners specialized spaces within the house.
The builder also offered a three-bedroom variation of the plan the following year. It eliminated the breakfast nook in favor of a bar, demonstrating how builders could modify the same basic arrangement for households with different space requirements.
The underlying organization remained intact. Whether the house had three bedrooms or four, the plan continued to distinguish between formal entertaining, everyday family activity, and private rooms.
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| Plan 424 by Kay Homes at Rancho Solano, introduced in 1966. The plan combined formal rooms at the front with informal family spaces and a private bedroom wing. |
Making the private wing more flexible: Morrison Homes
By 1969, Morrison Homes was finding new ways to build flexibility into the same basic arrangement. At Pleasanton Valley, the Woodhaven House offered 1,808 square feet, four bedrooms, and two bathrooms, with formal rooms toward the front, a kitchen and family room toward the rear, and a separate bedroom area.
But the plan gave homeowners another choice: the fourth bedroom could be converted into a retreat adjoining the primary suite. Instead of treating every bedroom as an interchangeable room, the option allowed part of the house to be adapted to the household's particular needs.
The idea fit neatly into the larger zoning strategy. The formal living and dining rooms remained available for entertaining, while the kitchen and family room served everyday life. Within the private part of the house, meanwhile, the primary suite could become its own small living area.
It was another variation on the same theme: rather than asking one room to serve every purpose, builders were giving different activities their own spaces.
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| The Woodhaven House by Morrison Homes at Pleasanton Valley. The fourth bedroom could be converted into a retreat adjoining the primary suite. |
Making room for circulation: Mackay Homes
By 1971, Mackay Homes was giving the same basic arrangement a different emphasis. At Del Prado in Pleasanton, the Carmel model used a broad central convergence point where several of the home's circulation paths came together. The four-bedroom, two-bathroom plan measured 1,790 square feet.
The space brought together movement from the foyer, the hall leading to the private bedroom areas, and the passage toward the kitchen and family room. Rather than treating those paths as separate corridors that simply met, the plan gave their convergence more room. It created a generous transition space between the home's different zones, recognizing that this was where much of the household's movement would naturally occur.
It was also a surprisingly social space. Someone departing the home could retrieve a coat from the closet, put it on, and pause there to say goodbye to someone seeing them off. It was not a room with a single assigned purpose so much as a place where the activities of the house briefly overlapped—a kind of hugging zone at the center of the plan.
The Carmel model also offered another form of flexibility within the private zone: the fourth bedroom could instead be configured as a retreat for the primary bedroom. As with Morrison Homes' Woodhaven House, the option allowed part of the bedroom area to take on a more specialized role without changing the overall organization of the house.
The Carmel model illustrates another recurring characteristic of these 1960s and 1970s plans: circulation was part of the design strategy. The house did not simply connect its rooms with the shortest possible passages. It gave particular attention to the places where different parts of family life—and the people moving between them—came together.
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| The Carmel model by Mackay Homes at Del Prado. Its generous central “hugging zone” brought together the home’s major circulation paths and created a natural transition between its different areas. |
Testing the pattern: H.C. Elliott’s Huntington
By 1973, H.C. Elliott was testing how far the basic arrangement could be changed. At Somerset West in Livermore, the original Huntington model still provided four bedrooms and two bathrooms, but at just 1,479 square feet, it was considerably more compact than the earlier examples.
The plan also relaxed the separation between the home's different areas. A circular kitchen occupied the center of the house, connecting the surrounding living spaces rather than placing the kitchen and family room into a distinct rear zone. There was no formal dining room, and the hallway leading to the bedrooms was visible from the front entry.
Some elements of the earlier pattern remained. The primary bedroom was positioned toward the rear of the house, and the bedrooms were still grouped together. But the relationship between the entry, living spaces, kitchen, and bedroom wing was more open, with fewer visual and spatial boundaries between them.
The Huntington is useful precisely because it shows that the floor-plan formula was not fixed. Builders could compress the plan, eliminate formal rooms, and make circulation and living spaces more closely connected while retaining the basic four-bedroom suburban house.
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| Floor plan for the original Huntington model by H.C. Elliott at Somerset West. Known for its round kitchen and open layout, the plan broke new ground despite its unconventional visibility of private spaces. |
Reworking the Huntington
Later in 1973, H.C. Elliott offered a revised version of the Huntington at Vintage Hills in Pleasanton. The house was still a four-bedroom, two-bathroom plan, but it grew to 1,699 square feet and returned to several of the organizational ideas seen in the earlier Tri-Valley examples.
The revised plan restored a formal living room and dining room near the front of the house, while the kitchen and family room occupied the rear. The bedrooms remained grouped in a separate wing, with the primary bedroom at the back. An adjustment of the walls near the entry also screened the bedroom hallway from direct view of the front door.
The changes made the distinction between the home's different zones much clearer. Formal rooms were once again associated with the entry and entertaining, everyday family activity was concentrated farther into the house, and the bedroom area was more visually protected.
Placed alongside the original Huntington, the two plans show that the arrangement of these suburban houses was still evolving in the early 1970s. H.C. Elliott did not simply repeat one fixed formula: the two versions demonstrate different ways of balancing openness, circulation, formal rooms, and privacy within a four-bedroom house.
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| Floor plan for the revised Huntington model by H.C. Elliott at Vintage Hills. This updated version added a formal dining room and visually separated the bedroom wing from the entry for improved privacy and flow. |
A floor plan shaped by its time
The Tri-Valley houses of the 1960s and early 1970s show how builders adapted a broader set of ideas about family life into practical tract-home designs. Formal living and dining rooms, connected kitchen and family spaces, and more private bedroom areas appeared repeatedly—not as a single standardized plan, but as variations on a common approach to organizing the house.
The examples also show that the formula was never completely fixed. Kay Homes and Morrison Homes built flexibility into the private areas, Mackay Homes gave special attention to the places where circulation converged, and H.C. Elliott experimented with a more open arrangement before offering a revised Huntington that restored stronger separation between formal, family, and private spaces.
These plans became less common as residential development changed. Narrower lots left builders with less room to spread different functions across a single-story house.
What remains visible in these floor plans is a particular moment in suburban housing: a period when the house was expected to accommodate both formal entertaining and everyday family life, and when builders had enough space to give those activities their own territory.
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Tract home design in the Tri-Valley
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