On Sebastopol Road in southwest Santa Rosa, development cost per unit is now higher than resale value. Casa Roseland, the 75-unit affordable building at 883 and 665 Sebastopol Road, held its grand opening on October 9, 2026. The city's affordable housing pipeline report lists its total development cost at $73,581,547. That works out to roughly $981,000 per unit. In August 2026, the average residential sale in the southwest Santa Rosa area was $664,011, according to BAREIS MLS area data.
That gap explains most of what is and isn't getting built in Santa Rosa right now. It also changes how a buyer should weigh a new home against a resale home.
One Corridor, Three Outcomes
The same stretch of Sebastopol Road holds a finished subsidized building, a stalled market-rate building, and a new-home community that is open for sales.
| Project | What it is | Status as of October 2026 |
|---|---|---|
| Casa Roseland, 883 and 665 Sebastopol Rd | 75 affordable rental units by MidPen Housing | Grand opening October 9; 54 of 74 leasable units occupied |
| Tierra de Rosas market-rate phase | Planned 100 market-rate apartments east of Casa Roseland | No definitive timeline |
| Brittain Oaks, 3111 Sebastopol Rd | City Ventures for-sale homes, 1,600 to 2,040 sq ft | Now selling, from $599,990 |
The Press Democrat's coverage of the opening breaks down the costs. The four-story building cost $47 million. The one-acre Plaza Permanente park at Sebastopol Road and West Avenue cost $4 million. Underground utilities and site improvements cost another $38 million. State Sen. Mike McGuire said the state invested nearly $42 million in Tierra de Rosas. The building was also financed with federal Low Income Housing Tax Credits.
Michelle Whitman, executive director of the Sonoma County Community Development Commission, told the Press Democrat there is no definitive timeline for the 100 market-rate apartments. She said the likely reasons are high construction costs, elevated interest rates and other market pressures. The county issued a request for proposals for the site's commercial parcel in the spring and received no responses.
The subsidized building got finished. The unsubsidized rental building next to it did not. A few miles farther out on the same road, a for-sale builder is taking reservations.
Why Buying a Building Beats Building One
Apartment investors decide whether to build by comparing two prices. One is the cost of building a unit. The other is the cost of buying an existing unit that already earns rent. Right now in Sonoma County, those two numbers are far apart.
In their 2026 Sonoma County apartment market report for the Press Democrat, Kate Raphael Smith and Scott Gerber of Norcal Commercial reported that apartment buildings with five to 150 units sold in 2025 for an average of $265,000 per unit, or $338 per square foot. In the same report, they put construction costs for new apartments at close to $500 per square foot. A year earlier, the same authors put hard costs alone at $425 to $475 per square foot, before land and soft costs.
An investor can buy existing apartments for roughly two-thirds of what it costs to build new ones. A new project only works if its rents justify the higher cost. The same report lists asking rents at new class-A communities: $2,230 to $2,358 for studios, $2,499 to $2,953 for one-bedrooms, and $3,012 to $3,915 for two-bedrooms. The authors wrote that these rents reflect construction costs.
Those rents are now facing more competition. Countywide vacancy rose to 4.6% in 2025. Concessions and promotions were up 91% from the two prior years. Another 1,240 units are under construction for delivery in 2026 and 2027. A developer counting on premium rents is now competing with free-month offers in buildings that just opened.
Subsidized housing has its own version of this problem. In July 2026 reporting by the Press Democrat, Megan Basinger, Santa Rosa's director of housing and community services, said the average deed-restricted home in the area costs $622,000 to build. The city's annual state block grant and housing funds, up to $3.5 million a year, cover only about $79,000 of that per unit. Gabe Osburn, the city's planning director, described the timing risk in the same story: "The project that pencils today may not pencil six months from now."
The Homes That Are Getting Built
New for-sale homes keep getting built. As of January 1, Santa Rosa had permitted 2,573 homes in the above-moderate income category. That is 99% of its state target for that category, the most progress in any income bracket, according to the same Press Democrat report.
Here are the new for-sale communities currently on the market:
- Brittain Oaks, 3111 Sebastopol Road. City Ventures lists homes from $599,990. Plan 1 has 1,600 square feet, three bedrooms and a two-car garage, which works out to about $375 per square foot.
- Round Barn, 208 Cupola Circle in Fountaingrove. City Ventures lists townhomes from $659,990, with 1,745 to 1,885 square feet. That is about $378 per square foot at the smallest plan.
- Acacia Village, 746 Acacia Lane in northeast Santa Rosa. Villa Homes is building 25 single-family homes in phases, with pricing starting in the $700,000s. Three of the homes are deed-restricted. The city pipeline lists phase targets of August 2026, December 2026 and June 2027.
These per-square-foot figures and the $500 apartment figure measure different things. The builder prices are retail prices for finished homes, and they include the land. The apartment figure is what it costs a developer to build. The 2025 version of the same report put hard costs at $425 to $475 per square foot, before land and soft costs. None of these sources publish a builder's own cost to build a for-sale home. What the numbers do show is which type of housing is reaching the market. In southwest Santa Rosa and Fountaingrove, for-sale homes are being finished and listed below $700,000. The rental buildings that depend on high rents are the ones waiting for a start date.
Where New Pricing Lands Against the August Resale Market
The latest Santa Rosa area report from BAREIS covers August 2026 closings, reported September 8. It lists averages rather than medians, and the sample in each area is small.
| BAREIS area, August 2026 | Residential sales | Average sale price | Average days on market |
|---|---|---|---|
| NW Santa Rosa | 42 | $721,090 | 45 |
| NE Santa Rosa | 53 | $865,919 | 58 |
| SW Santa Rosa | 19 | $664,011 | 53 |
| SE Santa Rosa | 24 | $783,521 | 53 |
Countywide, BAREIS reported 383 residential closings in August 2026, with a median sold price of $750,000 and median days on market of 40.
Brittain Oaks starts about $64,000 below the August average for southwest Santa Rosa. Round Barn starts below the countywide median. In this part of the market, a new home is priced in the same range as resale and does not carry an obvious premium. One caution about the averages: they move a lot from month to month. Southeast Santa Rosa averaged $1,027,217 across 23 sales in July 2026. In August it averaged $783,521 across 24 sales. With samples this small, one estate sale more or less can move an area's average by six figures.
What the Cost Gap Means for a Buyer Weighing New Against Resale
The building costs behind these projects show up in a buyer's choices in a few ways.
- New construction competes on price in the $600,000s. When a builder sells at or below the area's resale average, the decision is about lot size, age of systems, layout and location within the city. It is less about paying extra for something new.
- New for-sale supply comes slowly. Acacia Village releases homes in phases through mid-2027. City Ventures publishes starting prices, and those prices are snapshots that can change between visits.
- Downtown rental construction has a policy tailwind. In August 2026, the City Council extended Santa Rosa's High-Density Multi-Family Residential Incentive Program through August 31, 2031, without changing its fee reductions and deferrals. Six downtown projects have used the program, and three more are in the pipeline.
- Large rental pipelines are concentrated in the northwest. The city's pipeline lists Pacific Development's 770-unit Lance Drive rental project, with a first phase projected for January 2027 and a final phase for October 2027. It also lists City Ventures' 54-unit Courtney Estates, with phased completion running into January 2027.
Whether a project like the Tierra de Rosas market-rate building ever starts depends on construction costs, interest rates and achievable rents moving into line. Until that happens, Santa Rosa's new homes will keep arriving mostly as for-sale homes and subsidized rentals.
Frequently Asked Questions
Is new construction in Santa Rosa more expensive than resale? Not in every segment. In August 2026, the average southwest Santa Rosa resale was $664,011, and Brittain Oaks on Sebastopol Road lists homes from $599,990. Higher-end resale areas and larger new homes compare differently.
Why are some Santa Rosa apartment projects on hold? Sonoma County apartment construction costs are close to $500 per square foot. Existing apartment buildings sold for an average of $338 per square foot in 2025. When building costs that much more than buying, new rental projects need premium rents or public subsidy to move forward.
What else is planned at Tierra de Rosas? Besides the 100 market-rate apartments, the plan includes a civic parcel and a small commercial space. The county has a memorandum of understanding with the nonprofit Health Equity Rising for the civic parcel, according to the Press Democrat.
When a new home is priced close to the resale next door, the real comparison is lot, finishes and location, and seeing that clearly takes construction experience. Randy Waller grew up in a family building business and reads builder pricing the way a builder does. Let's connect if you want a new community and a resale home compared side by side before you commit.
