ADU in San Ramon, CA
ADU Design & Permitting in San Ramon starts with a documented permit set, not a sketch on a napkin. The city’s 1980s-90s tracts in Twin Creeks and Bollinger Canyon sit on 6,000-10,000 sq ft lots that easily accommodate detached units, but inland valley heat and expansive clay soils on hillside parcels mean the drawings have to get Title 24 cooling and foundation engineering right the first time. Call (971) 497-2402 for a written price before any work starts.
Why San Ramon Homes Are Different
San Ramon sits deep in an inland valley where summer highs regularly hit 95-105°F, disconnected from the marine layer that keeps Oakland and Berkeley mild. That changes the design math for every ADU: mechanical cooling is a requirement, not an option, and Title 24 energy compliance drives some of the biggest line items on the permit set. The housing stock compounds the picture. Established neighborhoods like Twin Creeks, Crow Canyon, and Bollinger Canyon were built between roughly 1978 and 2000 as large-lot suburban tracts, which means generous rear yards for detached ADUs but aging panels, undersized gas lines, and original sewer laterals that need real site assessment. Hillside parcels in Crow Canyon and the eastern foothills sit on expansive clay that can require engineered foundations, a cost flat-lot estimates will not capture. And the Dougherty Valley master-planned communities, built in the 2000s by Shapell and Windemere, layer HOA architectural review on top of city permits, adding steps that contractors unfamiliar with the area consistently underestimate.
Our Main San Ramon Services
Most San Ramon homeowners call us about one of two projects: converting an existing garage into a permitted ADU, or building a new detached unit in the rear yard. Both are covered under our single design-build contract, and both get a written price before any work begins.
Garage Conversion ADU in San Ramon
Garage conversions in San Ramon make particular sense in the 1980s-90s tracts, where attached garages are spacious and the lot is already graded. The work involves converting the existing footprint into a legal dwelling unit: insulation, drywall, electrical, plumbing, a kitchenette or full kitchen, and a private entrance. One local condition we check early is the slab thickness; many Twin Creeks garages sit on 4-inch slabs that are within range for conversion but need verification before the permit set is drawn. See the full scope on our Garage Conversion ADU in San Ramon page.
New Detached ADU in San Ramon
A new detached ADU in San Ramon is the strongest play for the large rear yards in Bollinger Canyon and Crow Canyon. The unit is built from the ground up, typically 600-1,000 sq ft, with its own foundation, utilities, and address. On hillside parcels with expansive clay, we specify engineered foundations from the start so the permit set reflects real soil conditions, not a flat-lot assumption. Details on design, permitting, and construction are on our New Detached ADU in San Ramon page.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
ADU Design & Permitting in San Ramon
ADU Design & Permitting in San Ramon is where most projects either get built correctly or quietly go sideways. The permit set is the core product at Ellery ADU Studio, because a drawing that clears the city building department but fails DSRSD review, or one that skips Title 24 cooling calculations for a 100°F inland valley summer, costs you weeks and four-figure change orders down the line. We produce every drawing, every energy calc, and every utility schedule under one contract at one written price. Our ADU Design & Permitting service covers everything from the first site visit to the stamped permit set.
Site Assessment
Signs you need it
Your lot has slope, mature trees near the build area, an aging sewer lateral, or you simply want to know what your parcel can actually support before spending money on drawings.
What it costs in San Ramon
Site assessment in San Ramon typically runs $500-$1,500 depending on lot complexity, soil conditions, and whether a survey is already on file with the county.
How we do it
We walk the parcel, pull the existing survey and utility records, check the DSRSD connection point, and document the findings in a written site report with photos.
ADU Design & Blueprints
Signs you need it
You have a clear idea of the unit you want, but you need a buildable, code-compliant drawing set rather than a concept sketch.
What it costs in San Ramon
Full ADU design and blueprint production in San Ramon generally lands between $8,000-$15,000 depending on unit size, roof complexity, and the number of revisions through the permit process.
How we do it
We produce the architectural drawings, structural sheets, and Title 24 energy documentation as one package, then stand behind it through every city and district review comment.
Permit Application
Signs you need it
Your drawings are ready, but you’re staring at the city of San Ramon’s submittal checklist and the DSRSD capacity fee schedule, and you don’t want to burn three months learning the queue the hard way.
What it costs in San Ramon
Permit application and expediting support in San Ramon typically runs $2,500-$5,000, separate from the city and district fees themselves, which are billed directly to you.
How we do it
We submit the full permit set to the city building department, coordinate the DSRSD plan review in parallel, and track every correction until the permit is issued.
HOA & Zoning Compliance
Signs you need it
Your home is in Dougherty Valley or another HOA-governed community in San Ramon, and you’ve already been told the HOA has to ‘approve’ your ADU.
What it costs in San Ramon
HOA and zoning compliance review in San Ramon typically costs $800-$2,000, depending on the HOA’s architectural review process and any zoning variance work required.
How we do it
We prepare the HOA submittal package, document every zoning standard the unit meets under state ADU law, and manage the review so the HOA’s legal limits are clear from day one.
What ADU Design & Permitting Costs in San Ramon
| Item | Typical range in San Ramon |
|---|---|
| Site assessment | $500-$1,500 |
| ADU design & blueprints | $8,000-$15,000 |
| Permit application & expediting | $2,500-$5,000 |
How long does ADU permitting take in San Ramon?
Plan review with the city of San Ramon typically takes 60-120 days from submittal to issuance. DSRSD utility review runs in parallel but has its own queue. A permit set that addresses both agencies’ comments cleanly avoids the multi-week delays that stall projects mid-review.
Do I need a soils report for a detached ADU in San Ramon?
On flat lots in the 1980s-90s tracts, usually not, but hillside parcels in Crow Canyon and the eastern foothills on expansive clay often do. The cost varies. Call (971) 497-2402 to have your specific parcel assessed.
Junior ADU & Interior Conversion in San Ramon
Junior ADU & Interior Conversion in San Ramon is the fastest path to a legal rental unit for the city’s multigenerational households, which are more common here than anywhere else in the Tri-Valley. A JADU converts existing interior space inside the primary home, typically 300-500 sq ft, with its own entrance and kitchenette but shared or attached systems. Our Junior ADU & Interior Conversion service handles the full conversion under one contract, from drawings to final inspection.
Interior JADU
Signs you need it
You have a large primary bedroom suite, a finished basement, or an oversized bonus room you want converted into a legal, rentable Junior ADU without adding square footage.
What it costs in San Ramon
Interior JADU conversion in San Ramon typically runs $80,000-$130,000 depending on existing conditions, plumbing locations, and whether a new entrance is required.
How we do it
We draw the JADU permit set showing the new kitchenette, entrance, and separation requirements, then build it out within the existing footprint and close the permit.
Room-to-ADU Conversion
Signs you need it
You have a large room or attached space that is underused, and you want it converted into a fully self-contained ADU with its own kitchen and bath.
What it costs in San Ramon
A room-to-ADU conversion in San Ramon typically costs $120,000-$180,000, depending on whether new plumbing and electrical runs are needed and whether the space has its own exterior wall.
How we do it
We design the conversion so the new unit has its own address, entrance, kitchen, bath, and utility connections, then build it under the same single-contract model.
What Junior ADU & Interior Conversion Costs in San Ramon
| Item | Typical range in San Ramon |
|---|---|
| Interior JADU | $80,000-$130,000 |
| Room-to-ADU conversion | $120,000-$180,000 |
| Above-garage ADU | $150,000-$220,000 |
Can I rent a JADU in San Ramon?
Yes. A permitted JADU is a legal rental unit under California law. The rental premium in San Ramon is strong because of the San Ramon Valley Unified School District, which draws families willing to pay above market for a unit in the district. Call (971) 497-2402 to discuss your specific property.
Does a JADU need its own utility connections in San Ramon?
A JADU can share water, sewer, and electrical service with the primary home under state law. That shared-system approach is what keeps JADU conversion costs below detached ADU costs. A written scope locks the utility plan before work starts.
ADU Site Prep & Utilities in San Ramon
ADU Site Prep & Utilities in San Ramon is the least visible and most delayed part of most ADU projects, because water and sewer connections here run through the Dublin San Ramon Services District, a separate agency with its own capacity fees, connection fees, and plan-review queue that operates independently of the city building department. Builders who don’t schedule DSRSD early routinely hit multi-week delays and unexpected four-figure fees late in the permit process. Our ADU Site Prep & Utilities service coordinates the site work and the district interface from the start.
Foundation & Grading
Signs you need it
Your lot has slope, poor drainage, or expansive clay, which describes most hillside parcels in Crow Canyon and the eastern foothills of San Ramon.
What it costs in San Ramon
Foundation and grading work for a detached ADU in San Ramon typically runs $25,000-$50,000 depending on soil conditions, slope, and whether engineered piers or a full retaining wall are required.
How we do it
We run the soils assessment where required, specify the foundation in the permit set, and build it to the engineered drawings, documenting every stage with photos.
Electrical Panel Upgrade
Signs you need it
Your home was built in the 1980s or 1990s and still has a 100-amp or 125-amp panel, which won’t support an ADU with electric cooling and modern appliances.
What it costs in San Ramon
Electrical panel upgrades for ADU service in San Ramon typically cost $4,000-$8,000, depending on whether the panel is replaced or a subpanel is added and how much trenching is needed to the new unit.
How we do it
We size the panel to the ADU’s Title 24 load calculations, pull the electrical permit, and upgrade the service before the new unit is connected.
Plumbing Lateral
Signs you need it
Your existing sewer lateral is original to a 1980s-90s home, and adding an ADU means connecting to it or running a new lateral to the DSRSD main.
What it costs in San Ramon
Plumbing lateral work for a new ADU connection in San Ramon typically runs $6,000-$15,000, depending on distance to the sewer main, trench depth, and whether the existing lateral can be reused.
How we do it
We verify the existing lateral’s condition with a camera inspection, confirm the DSRSD connection requirements, and run the new or replacement lateral to the district’s spec.
What ADU Site Prep & Utilities Costs in San Ramon
| Item | Typical range in San Ramon |
|---|---|
| Foundation & grading | $25,000-$50,000 |
| Electrical panel upgrade | $4,000-$8,000 |
| Plumbing lateral | $6,000-$15,000 |
Why is DSRSD a separate step for San Ramon ADUs?
San Ramon’s water and sewer service is provided by the Dublin San Ramon Services District, not the city. DSRSD charges capacity fees, reviews the utility plan, and has its own inspection queue. Scheduling their review early prevents late-stage delays. Call (971) 497-2402 and we’ll map the full district interface for your project.
Do I need my own water meter for an ADU in San Ramon?
DSRSD typically allows a sub-meter for an ADU rather than a separate service connection, but the district’s requirements are specific. We confirm the exact metering approach during the design phase so there are no surprises at connection time.
Brands We Service in San Ramon
We specify and coordinate Abodu, Cover, and Dvele prefab systems within our single design-build contract, and we keep common components for these systems locally accessible so San Ramon jobs don’t stall waiting on out-of-state parts. See the full list on our brands page.
Pricing for ADU in San Ramon, CA
| Service | Typical range in San Ramon |
|---|---|
| Site assessment | $500-$1,500 |
| ADU design & blueprints | $8,000-$15,000 |
| Permit application & expediting | $2,500-$5,000 |
| HOA & zoning compliance review | $800-$2,000 |
| Interior JADU | $80,000-$130,000 |
| Room-to-ADU conversion | $120,000-$180,000 |
| Foundation & grading | $25,000-$50,000 |
| Electrical panel upgrade | $4,000-$8,000 |
| Plumbing lateral | $6,000-$15,000 |
Prices in San Ramon push upward on hillside parcels with expansive clay, on any lot where the sewer lateral has to be replaced, and in Dougherty Valley where HOA review adds process time. Every project gets a written price before any work starts under Haven Standard Clause 1, and that price does not change unless you change the scope.
Neighborhoods We Serve in San Ramon
Our crews work throughout San Ramon, and we know which neighborhoods carry the site conditions that change an estimate. We schedule a walkthrough within about a week of your call.
- Twin Creeks
- Crow Canyon
- Bollinger Canyon
- Dougherty Valley
- Windemere
Service Area - Cities Near San Ramon
We also serve the surrounding Tri-Valley and East Bay communities, including Dublin, CA and Pleasanton, CA to the south, Danville, CA to the north, and Hayward, CA across the ridge. The same written-price guarantee and single design-build contract apply on every project in every city.
Serving San Ramon, CA - Our Local Coverage Area
We’re based in the San Ramon area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU in San Ramon
We typically schedule a site walkthrough within about a week of your call, and the design phase begins as soon as the written price is signed. Permitting with the city and DSRSD runs 60-120 days in parallel with our construction planning. Call (971) 497-2402 to get your project on the schedule.
No. California state ADU law limits what an HOA can block, but HOA architectural review still adds steps and a few weeks to the timeline. We prepare the HOA submittal package with every zoning standard documented so the review moves without unnecessary back-and-forth.
Yes. Bring us any written estimate from another designer or contractor and we will review it against San Ramon’s actual conditions, DSRSD fees, and Title 24 requirements at no charge. You’ll get a line-by-line written response, not a summary of how it felt.
Call (971) 497-2402 to schedule your free San Ramon ADU estimate. A live person answers, and every project gets a written price before any work begins.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What San Ramon Customers Say
"Handled the whole planning process. We went to one hearing and that was it."
- Rowena C."Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
- Arjun D."The permit set and the build were one contract with one number. Our neighbours used two firms and spent a year watching them blame each other."
- Helena V.