A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable ADU Builders Across Albany
Adding an ADU in Albany means navigating some very specific rules: a 4-foot side-yard setback, a green space requirement on smaller lots, and seismic triggers on pre-1940 structures. Most Albany homeowners we talk to want a straightforward answer before anything else: what will this cost, and what will the city make me do? A detached ADU in Albany typically runs $280,000 to $520,000 depending on size, site conditions, and whether you’re converting a garage or building new. Call us at (424) 328-5746 and we’ll put a written price in front of you before any work starts.
Our crews know Albany’s compact lots, its Craftsman bungalows, and the design-review culture that shapes what gets approved. When you call, a live person answers. That’s not a perk; it’s the baseline for how we work.
Why Albany Homeowners Choose Benson ADU San Francisco
We’ve built enough projects on Albany’s numbered streets east of San Pablo Avenue to know exactly which questions the planning desk will ask. That matters because Albany reviews ADU applications for design character, not just code compliance. Homeowners who come to us after getting bounced elsewhere usually tell us the same story: their first contractor didn’t know the green space rule, or the setback, or the seismic scope on a 1920s garage. We don’t have that problem.
Our ADU Builders team is part of the Relay Home Co. family, founded in 2006. Every project in Albany runs under the Relay Visibility Guarantee: a written price before work starts, real-time tracking, and a 365-Day Done Right Promise. If the work isn’t right within a full year, we make it right. That guarantee is stamped on every contract we sign.
You’ll see background-checked, uniformed technicians on your Albany job site, and a live person answers the phone around the clock. Troy Eastman leads our crews, and he holds the same standard on every project: the plan and the price in writing from the first conversation.
ADU Construction in Albany
ADU construction in Albany is a different animal than it is across the border in Berkeley or El Cerrito. Albany’s small lots, pre-1940 housing stock, and active design-review process mean your project needs to be scoped correctly before a single permit application gets filed. We walk homeowners through every phase: site assessment, architectural drawings calibrated to Albany’s specific code, seismic evaluation, permitting, foundation work, and framing through finish. On an average Albany lot, construction itself runs 7 to 11 months once permits clear.
Site Assessment and Code Reality Check
Before we quote anything, we measure the actual buildable envelope on your lot. That means side-yard setbacks, rear-yard depth, green space calculations, and the existing garage foundation condition. We flag the things that drive real cost: rotted sill plates, missing shear walls, and whether your existing slab has a vapor barrier.
Design That Clears Albany Review
Albany’s design review culture means your ADU needs to look like it belongs on your street. We bring options from Plant Prefab and Abodu, plus James Hardie cladding materials, and we explain what each choice costs. You get curated options, not a single take-it-or-leave-it product.
Detached ADU in Albany
A detached ADU in Albany is the most common project we build, and it usually replaces an old detached garage on a numbered street east of San Pablo Avenue. Expect to pay $300,000 to $520,000 for a two-story unit that fits within Albany’s setback and green space rules. The scope includes demo, foundation work, seismic retrofit where needed, framing, utilities, and finishes. Most detached ADUs in Albany end up as two-story designs with a compact footprint, because a single-story layout consumes too much yard.
The Two-Story Cantilever Solution
Albany’s green space requirement on lots under 5,000 sq ft pushes many owners toward a two-story ADU with a cantilevered upper floor. That’s not a stylistic choice; it’s how you get usable square footage without eating your yard or violating the 4-foot side-yard setback. We design these deliberately, with the upper floor overhanging the required green area.
Garage Conversions and Seismic Scope
If your existing garage is from the 1920s or 1930s, assume it needs seismic retrofitting before it becomes living space. On Kains Avenue near the BART tracks, our crew converted a 1926 detached garage behind a Craftsman bungalow into a two-story ADU. We first performed a seismic retrofit on the original foundation, then cantilevered the upper floor over the required green space, using James Hardie siding to match the main house’s board-and-batten character while meeting the 4-foot side-yard setback. That project finished on budget because the retrofit was priced from day one, not discovered mid-demo.
Trusted Brands We Service in Albany
We build with Plant Prefab and Abodu systems because Albany homeowners like to research products independently before committing. You can pull up each brand’s specs, warranty, and reputation without taking our word for it. For cladding, we use James Hardie fiber cement because it holds up in Albany’s cool, foggy summers and wet winters far better than wood siding. We keep local inventory on hand for Albany jobs, which means less waiting on materials and fewer schedule slips when we’re mid-project.
Common ADU Builders Problems We See in Albany Homes
- Hidden foundation rot on pre-1940 garages. Demolition exposes rotted sill plates and missing shear walls that no one budgeted for. We include a seismic eval in every Albany quote so this doesn’t become a surprise line item.
- Single-story designs that trigger the green space rule. A footprint that works in El Cerrito can fail Albany review because it leaves no green space. We design to the constraint from the first sketch, not after the city sends it back.
- Moisture problems on slab-on-grade ADUs. Albany’s marine layer and wet winters mean a slab without a vapor barrier and proper insulation will develop dampness issues. We spec vapor barriers and upgraded insulation on every slab-on-grade build in Albany.
- Setback violations discovered mid-project. The 4-foot side-yard setback catches people who assumed Berkeley rules applied. Our crews measure the envelope before we quote, so the plan we submit is the plan that gets built.
Pricing for ADU Builders in Albany, CA
A detached ADU in Albany generally runs $300,000 to $520,000. Garage conversions with seismic retrofit land between $180,000 and $340,000. Junior ADUs inside an existing home are $90,000 to $160,000. Your specific number depends on size, foundation condition, whether you need a cantilevered upper floor, and the cladding and fixture package you choose. What won’t change is the written price you sign: no scope creep billed after the fact. Call (424) 328-5746 and we’ll schedule a site walk. You’ll get a line-item quote in writing, free.
We Also Serve Cities Near Albany
Our crews work throughout the East Bay, including Albany, plus Berkeley, Piedmont, Pinole, and Hercules. If you’re just outside city limits, call (424) 328-5746 and we’ll confirm coverage for your street.
Serving Albany, CA - Our Local Coverage Area
We’re based in the Albany 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 Builders in Albany
Albany’s green space rule applies to lots under 5,000 sq ft and requires a dedicated landscaped area separate from your ADU footprint. Practically, this means a single-story ADU often won’t fit without violating the requirement, so we design two-story units with a cantilevered upper floor that overhangs the green space. Your main floor footprint stays small; the upper floor gives you the square footage. Call (424) 328-5746 and we’ll measure your lot against the rule before you spend money on drawings.
Pre-1940 garages in Albany generally need foundation bolting, shear wall installation, and often a new concrete slab with proper tie-downs. We’ve opened 1920s garages on Kains Avenue and Solano Avenue where the sill plates were rotted through and the structure was essentially sitting on the ground. Retrofitting adds $25,000 to $45,000 to a typical garage conversion, and we price it upfront, not as a change order after demo.
The 4-foot side-yard setback in Albany is stricter than what many neighboring cities allow, and it usually pushes the ADU’s footprint inward on narrow lots. Combined with the rear-yard depth, this often means a two-story design is your only path to meaningful square footage. On the numbered streets east of San Pablo Avenue, where lots are deep but narrow, the cantilevered upper floor is the standard solution we recommend.
Yes. Albany’s fog and winter rain mean ground moisture will migrate through an unprotected slab, and you’ll smell it inside the ADU within the first year. We install a 10-mil minimum vapor barrier under every slab-on-grade ADU we build in Albany, plus perimeter insulation. It’s a few thousand dollars at build time, and it prevents moisture problems that cost far more to fix after the walls are up.
In Albany, expect 3 to 5 months for design and the permit application to run through the city’s planning and design review process, then 7 to 11 months of construction depending on scope and weather. Albany’s design review step adds time compared to some neighboring cities, so we start the paperwork as soon as you sign. Call (424) 328-5746 and we’ll give you a realistic calendar for your specific site.
Get Your Albany ADU Priced and Scoped, in Writing
You don’t need to become an expert on Albany zoning to get an ADU built. You need a team that already knows the rules, prices the job honestly, and puts every promise in writing. That’s what we do. Troy Eastman and our crews serve Albany full-time, and we answer the phone when you call. Call (424) 328-5746 for a free site walk and a written, line-item estimate. No verbal ballparks, no surprises at the door. Just a real price and a plan that clears Albany review.
Written by Troy Eastman, Owner at Benson ADU San Francisco, serving Albany and the East Bay.
