Fast, Reliable New Detached ADU Across East Palo Alto
On Runnymede Street near the Baylands, our crew replaced a detached garage slab where the original pour sat on unengineered fill. The salt air had already rusted the cheap electro-galvanized anchor bolts and corroded the aluminum window frames. That’s the pattern we see across eastern East Palo Alto, and it shapes how we spec every New Detached ADU we build here. We’re Ellery ADU Studio, a design-build practice founded in 2015 by Nadia Ellery. Drawings, permit set, and construction come as one contract at one written price. If you’re weighing a detached ADU on a East Palo Alto lot, call (971) 497-2402 and we’ll walk the site with you.
Why Ellery ADU Studio Is East Palo Alto’s Preferred New Detached ADU Company
East Palo Alto isn’t Palo Alto. The lots are smaller, the soil is different, and the salt air off the Bay reaches into everything. Nadia Ellery has built our practice around that reality. Every project here starts with the same question: which parts of this parcel sit on Bay fill, and what does the city’s flood map say about them. Most design-build firms treat the permit set as paperwork. We treat it as the core product, because in East Palo Alto the permit set is where a project lives or dies. Under Haven Standard Clause 1, you get a written price before any work starts. Not a phone quote. A written line item price.
Since 2015, we’ve designed, permitted, and built more than 900 ADUs, every one with a written price before work started and a documented photo record when work was complete. Our crews are background-checked and uniformed. A live person answers calls 24/7. And if the finished ADU is not built to the permitted drawings, our 365-Day Done Right Promise makes it right, in writing, before the project starts. That’s why East Palo Alto homeowners choose us over the Palo Alto firms that drive across the freeway with inland specs and bay-mud assumptions.
Our New Detached ADU Services in East Palo Alto
Custom Built ADU
Most East Palo Alto lots are 5,000 to 6,500 square feet with modest wood-frame ranchers from the 1940s through 1960s sitting on them. A custom detached ADU has to fit the rear setback, clear the FEMA Base Flood Elevation requirements if the parcel falls in Zone AE, and still leave room for the family to park. We design around all three. Foundations on eastern lots near the Baylands typically need a soils report before the building department will even look at the permit set. We handle that, and the slab elevation gets registered to the city’s flood requirement before we pull permits.
Prefab ADU Installation
Prefab works well on East Palo Alto lots because the site disturbance window is short. We specify and coordinate systems from Abodu, Cover, Dvele, and Mighty Buildings within the same single contract. But prefab doesn’t mean off-the-shelf. The anchor hardware, the hold-downs, the window frames, the flashing, all of it has to be marine-grade for the Bay salt air. A factory inland-spec unit bolted to a slab on Bay fill is a ten-year liability. We spec hot-dip galvanized hardware and marine-grade 316 stainless fasteners on every prefab ADU we place here.
Modular ADU
Modular units arrive with most of the enclosure built, but the foundation, utility connections, and site work stay with us. On eastern East Palo Alto lots with poor-draining bay-mud soil, we over-excavate and engineer the slab with drainage that handles winter ponding. The city and FEMA are already updating flood-zone boundaries based on sea-level-rise projections. A modular ADU set at the wrong elevation today can become a nonconforming structure in ten years. We set the finished floor elevation to current Base Flood Elevation plus freeboard, even when the current map doesn’t strictly require it.
Studio ADU
A studio ADU of 400 to 500 square feet is one of the most common requests we get from East Palo Alto homeowners. Often it’s an aging parent moving back in, or a rental unit to offset property tax reassessment. The constraint here is usually electrical. A shocking number of original East Palo Alto homes still run on 60-amp panels with galvanized supply lines. You can’t add a second dwelling unit on that. The panel upgrade becomes line one of the project scope, before framing. We’ll tell you that in the first site visit, not after you’ve signed.
1-Bed & 2-Bed ADU
The difference between a 1-bed and 2-bed ADU on a East Palo Alto lot is rarely just square footage. It’s parking, it’s the rear yard drainage that has to be re-engineered, and it’s the extra plumbing line that runs across a slab that may sit on undocumented fill. On Runnymede Street we replaced a garage slab where the original pour had no soils documentation at all. The geotechnical report took three weeks and added $4,800 to the foundation line item. That’s the kind of cost a homeowner deserves to know about before signing. Under Haven Standard Clause 5, the scope is locked at signing. No door-side upsells, no scope creep.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in East Palo Alto
We didn’t invent prefab, and we don’t pretend to. We specify and coordinate systems from Abodu, Cover, Dvele, and Mighty Buildings because they manufacture to a consistent structural standard. What East Palo Alto needs is a local build partner who knows which factory options survive Bay salt air and which don’t. We keep that knowledge current by tracking warranty claims and field failures across every unit we place in this city. When you call us about an Abodu unit or a Cover system, you’re talking to someone who has actually set the unit on Bay fill, not someone reading a spec sheet for the first time.
Common New Detached ADU Problems We See in East Palo Alto Homes
- Electro-galvanized anchor bolts rust through within five years. The salt air off the San Francisco Bay attacks the connection between ADU framing and foundation. We specify hot-dip galvanized hardware and 316 stainless fasteners on every project, and we document what was installed with a photo record.
- Standard aluminum window frames pit and seize. Bay salt gets into the tracks of patio sliders and windows, leading to water intrusion and stuck operation. We specify fiberglass frame windows with a coastal finish for every detached ADU in East Palo Alto.
- Sand-filled paver joints wash out during winter ponding. Eastern lots on bay-mud fill drain poorly. When paver joints wash, fence posts loosen, and walkways become trip hazards. We seal joints and engineer drainage at the lot level, not just around the ADU footprint.
- Original 60-amp panels can’t carry a second dwelling. Most East Palo Alto homes built in the 1940s through 1960s still have the original panel and galvanized supply lines. The panel upgrade is a prerequisite for permit approval, and we fold it into the written price from day one.
Pricing for New Detached ADU in East Palo Alto, CA
A new detached ADU in East Palo Alto runs $280,000 to $490,000 all-in, drawings through final inspection. Here’s the breakdown. A 400 to 500 square foot studio ADU typically lands between $280,000 and $360,000. A 1-bedroom of 550 to 750 square feet falls in the $340,000 to $440,000 range. A 2-bedroom with two baths runs $420,000 to $490,000. Prefab and modular units run 10 to 18 percent under custom-built on the structure, but the site work, foundation, and flood-elevation compliance are identical and often equal the unit cost. If the parcel is in FEMA Flood Zone AE, expect $18,000 to $38,000 in additional foundation and elevation work. The inland-spec version of this project is $25,000 cheaper on day one and $60,000 more expensive by year ten. We quote the coastal spec, because this city deserves it. You’ll get one written price before any work starts, and our Free Second Opinion covers any written estimate you already have in hand.
We Also Serve Cities Near East Palo Alto
Our East Palo Alto crews work locally, and the same coastal spec applies when we cross into Los Angeles, San Diego, San Jose, or San Francisco for projects that require the same design-build standard. Salt air and flood zone mapping don’t stop at the city line. Dispatch and scheduling are coordinated from our San Francisco Bay Area office, and crews serve East Palo Alto with local knowledge of the soil, the flood map, and the building department’s expectations.
Serving East Palo Alto, CA - Our Local Coverage Area
We’re based in the East Palo Alto 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 - New Detached ADU in East Palo Alto
If your parcel falls within FEMA Special Flood Hazard Zone AE along the Bay shoreline, the finished floor of your ADU must meet Base Flood Elevation requirements set by the city and FEMA. That means the slab gets raised, the foundation gets engineered differently, and the permit set must show the elevation certificate. Foundation costs typically run $18,000 to $38,000 more than a non-flood-zone ADU of the same size. Call (971) 497-2402 for an exact written price, not a range.
Garages and homes in the eastern sections near the Baylands were frequently poured on unengineered fill brought in decades ago with no soils documentation. The building department won’t issue an ADU permit without a geotechnical report confirming the fill can carry the new structure. The report typically adds three to six weeks and $3,500 to $6,000 to the project. We handle the soils investigation as part of the permit set, and the cost is included in your written price before work starts.
We specify hot-dip galvanized or 316 stainless steel fasteners for all roofing connections on East Palo Alto ADUs. Electro-galvanized fasteners, which are the default on most stock plans, rust through in the Bay salt air within five to seven years. The upgrade costs about $800 to $2,000 depending on roof size and pitch. We’d rather put that in the written price than have you pay for a roof tear-off and re-fasten in year eight.
Yes, in almost every case. A 60-amp panel cannot legally serve a primary residence plus a new detached ADU with its own kitchen, bath, and laundry. The upgrade to 200 amps, including any galvanized supply line replacement, typically runs $6,500 to $14,000 depending on the service drop and trenching. This is a hard requirement for permit approval, not an upsell. We include it in the written price from the first estimate, per Haven Standard Clause 1.
Sea-level-rise projections are already influencing how the city and FEMA redraw flood-zone boundaries in East Palo Alto. A lot that sits just outside Zone AE today may be drawn inside it in the next map revision. For that reason, we set finished floor elevations to current Base Flood Elevation plus freeboard on every east-side project, even when current mapping doesn’t require it. That costs more today and protects the asset for the life of the structure. Call (971) 497-2402 for a written quote on your specific lot.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving East Palo Alto since 2015.