New construction along the I-680 corridor is uneven from city to city: San Ramon is the most active market, Danville is nearly built out, Walnut Creek has limited new for-sale supply, and Concord has nothing selling today but the largest future story of all. If you are shopping for a new home between San Ramon and Concord, it helps to know where builders are actually delivering homes right now and where the pipeline is still years away. This guide walks the corridor city by city, names the active communities and builders, and points you to the deeper community guides where they exist.
Prices and live availability move week to week and builder sources often disagree, so I keep specific pricing out of these guides. For current pricing and availability on any community below, contact me directly.
Why is new construction so uneven along I-680?
The I-680 corridor through central Contra Costa is mostly established, built-out suburbs. Unlike East Contra Costa along Highway 4, where large tracts of land still support big master-planned communities, the 680 cities have less raw land and more infill. That means new construction here tends to be smaller, attached or higher-density, or tucked into the last remaining parcels of older master plans. A few larger opportunities exist, but they are concentrated in specific places, and the biggest one is a redevelopment that has not started selling yet.
Below, each city gets its own section so you can see where things stand today.
Communities along the I-680 corridor, city by city
San Ramon: the most active new-construction market on the corridor
San Ramon is where the corridor's for-sale new construction is most concentrated right now. The anchor community is City Village by SummerHill Homes at Bishop Ranch 6, which mixes attached townhomes, detached row homes, and single-family homes in one walkable plan near the Bishop Ranch employment center. It is the community most buyers on the corridor ask me about first, and it has its own detailed guide.
Beyond City Village, San Ramon has a near-term pipeline worth watching. Lennar's Iron Horse Village is listed as coming soon, and a future Lennar community called Canopy near Bishop Ranch is projected to bring roughly 255 single-family homes in the mid-to-late 2027 range. Both are projected and not selling today, so treat them as things to plan around rather than tour now. The older Dougherty Valley and Gale Ranch master plans, which delivered thousands of homes over the past two decades, are largely built out at this point.
Danville: nearly built out, with one community down to its final homes
Danville has very little new construction left. Davidon Homes' Magee Preserve, set near the Mount Diablo foothills, is the last active new-construction community in town and is in its final phase. I am keeping this as a short note rather than a separate guide because there is simply not much inventory left to write a full community guide around. Remaining availability changes quickly at this stage, so rather than quote counts that go stale, contact me and I will tell you exactly what is left when you are ready to look.
Walnut Creek: limited new for-sale supply
Walnut Creek's new for-sale supply is limited, and I want to say that plainly rather than overselling it. SummerHill's Oak Grove townhomes in the Contra Costa Centre area near the Pleasant Hill/Contra Costa Centre BART station are nearly built out. Most of the other new supply in Walnut Creek is downtown attached and higher-density product rather than detached single-family homes. If your heart is set on a brand-new detached home in Walnut Creek specifically, the options are thin, and it is worth talking through resale alternatives too.
Concord: nothing selling today, but the corridor's biggest future story
Concord has no new-construction communities selling today. The large story here is the redevelopment of the former Concord Naval Weapons Station, a long-term reuse project led by Brookfield Properties that is projected to eventually bring thousands of homes along with parks and commercial space. First homes there are projected around 2030, so this is a plan-ahead item, not a buy-now one. I cover it in more detail in the Concord Naval Weapons Station new-construction guide.
How does the 680 corridor compare to East Contra Costa?
If your main goal is a brand-new home and the specific city matters less, it is worth comparing the 680 corridor with the Highway 4 communities to the east, where more new construction is being delivered today. I keep dedicated pillars for those markets: the Antioch new-construction guide, the Oakley new-construction guide, and the Brentwood new-construction guide. Many buyers weighing a 680 community against an East County one are really weighing new against resale, which I break down in New Construction vs Resale in East Contra Costa.
Whichever city you land in, the buying process for a new home is different from buying resale. My step-by-step guide to buying new construction walks through the model-home visit, the contract, financing, and closing, and it applies just as well on the 680 corridor as it does in Brentwood.
What about schools along the corridor?
School assignments vary by city and even by parcel along I-680. San Ramon and Danville addresses generally fall within San Ramon Valley Unified School District, while Concord and parts of the corridor fall within Mt. Diablo Unified School District, and Walnut Creek addresses can involve more than one district depending on grade level. Because attendance areas can change and are set at the address level, confirm the current assignment with the district for the specific address you are considering rather than relying on a community-wide assumption.
Do I need my own agent to buy a new-construction home?
Yes, and it is worth understanding why. The friendly rep in the model home works for the builder, not for you. Their job is to represent the builder's interests, price, and contract. When you have your own agent, you have someone reviewing the purchase agreement, the lot premium, the options and upgrades, the financing incentives, and the timeline on your side of the table. The one catch specific to new construction is registration: most builders ask that your agent register you or accompany you on your very first visit for that representation to be recognized. So before you tour City Village, Magee Preserve, or any community on this list, reach out and let me register you first. It costs you nothing and it keeps your representation intact.
Frequently asked questions
Where is the most new construction along I-680 right now?
San Ramon is the most active for-sale new-construction market on the corridor today, anchored by SummerHill Homes' City Village at Bishop Ranch 6, with additional Lennar communities projected in the coming years. Danville, Walnut Creek, and Concord each have far less currently available.
Is there any new construction in Danville?
Danville is nearly built out. Davidon Homes' Magee Preserve near the Mount Diablo foothills is the last active new-construction community and is in its final phase. Contact me for current availability, as it changes quickly at this stage.
Can I buy a new home at the Concord Naval Weapons Station now?
No. The Concord Naval Weapons Station reuse, led by Brookfield Properties, is a long-term redevelopment with first homes projected around 2030. Nothing is selling there today. It is a plan-ahead opportunity rather than a current option.
Why is new construction so limited in Walnut Creek?
Walnut Creek is an established, largely built-out city with little remaining land for large new communities. Most new supply is downtown attached and higher-density product, and the SummerHill Oak Grove townhomes near Contra Costa Centre are nearly built out, so new detached options are limited.
How do school assignments work along the corridor?
Assignments depend on the city and the specific parcel, spanning districts such as San Ramon Valley Unified and Mt. Diablo Unified. Because attendance areas are set at the address level and can change, confirm the current assignment with the district for the exact address you are considering.
Should I use my own agent even for a new-construction purchase?
Yes. The builder's on-site rep represents the builder, not you. Having your own agent means someone reviews the contract, incentives, and lot details on your behalf. Just have me register you on your first visit so that representation is recognized by the builder.
New construction along I-680 rewards knowing where to look: San Ramon for what is selling now, San Ramon's pipeline and Concord for what is coming, and honest expectations in Danville and Walnut Creek. For current pricing and availability on any community in this guide, or to be registered before your first model-home visit, call or text me, Jaz Chand, at 925-250-9611. I am a licensed California Broker Associate (DRE #01751823) with The Jaz Team at Merrill Signature Properties, brand Homes With Accent, and I have spent more than 20 years and 460+ closed sales helping buyers across Contra Costa. This is general information, not tax or legal advice.