Arcfluence at AIA Ohio: ADUs for a Growing Columbus

Live in Columbus: Arcfluence Takes the AIA Ohio Stage

This weekend in Columbus, Arcfluence principals Paul Fatkins, AIA, NCARB, and Nick Karakaian stepped on stage at the AIA Ohio conference to tackle a timely question: How can Accessory Dwelling Units (ADUs) help Central Ohio grow smarter? The firm was also there to accept People’s Choice Awards for two projects—The Cliffs (2nd place, Residential) and BeAligned Health (3rd place, Commercial/Healthcare)—but the ADU session was the main event. The presentation—titled Integrated Living: ADUs as Catalysts for Community & Sustainable Growth—wasn’t abstract theory. It was a practical walkthrough of what’s happening in Columbus neighborhoods right now, what’s changing inside City Hall, and how architects, homeowners, and small developers can make good projects pencil and make neighborhoods better. (Download the full presentation PDF to follow along.) The opening slides set the tone: Columbus is growing faster than peer Midwestern metros while housing production hasn’t kept pace—exactly the kind of market pressure that makes “gentle density” solutions like ADUs worth everyone’s attention.

The presenters led with clear context: Columbus added roughly 30,000+ residents in 2024—a metro growth rate about 38% higher than the national average—and still faces a persistent annual supply gap, which continues to elevate prices and tighten vacancy rates. That’s the backdrop for the ADU conversation, and it’s why the room was full.

“Columbus has to get creative with housing solutions. ADUs won’t fix the shortage alone—but they meaningfully help and do it without blowing up neighborhood character.”

Deep Experience Where Policy Meets Practice

Paul’s practice background runs deep in residential; Nick’s path weaves through commercial interiors, client-side coordination at Google, contracting, and real estate investing—together, they’ve touched 700+ homes over the past decade and change. They work daily where policy meets constructability, and they’ve had a front-row seat to how Columbus’s housing market has shifted. In the first few minutes, Nick noted the broad trend many residents feel: the region drew them for affordability and space, and in recent years, the cost curve has steepened again. For architects in the room, that signal is clear: if you’re not prepared to discuss ADUs with clients—in historic districts, in walkable neighborhoods, or on deeper lots—you’re missing an increasingly common part of the Columbus conversation.

The team framed ADUs as one piece of a broader, credible toolkit that includes zoning reform, transit-oriented development, and design strategies that squeeze value out of smaller footprints. It’s the pragmatic, “let’s solve this together” posture Columbus needs right now.

Columbus: Fast Growth, Tight Supply, Real Pressure

The session’s early slides make the data legible at a glance: population up, housing production lagging, median home prices outpacing income growth, and rental vacancy rates sliding. In short, Central Ohio needs projects that can be delivered incrementally, on existing parcels, with careful attention to neighborhood fabric. ADUs fit that description well. They’re also a political and community conversation starter: small enough to feel manageable; impactful enough to matter.

For the Columbus SEO crowd: yes, this is squarely about Columbus ADUs, Columbus zoning reform, carriage houses in Victorian Village and German Village, and what “gentle density” means at the street level. The point of framing it locally isn’t just keyword flavor—it’s that Columbus’s details matter: historic commissions, lot configurations, parking expectations, and neighborhood character are all real constraints and opportunities.

What Counts as an ADU in Columbus Practice?

Paul and Nick defined today’s ADU plainly: a secondary, independent living space on the same parcel as a single-family home, with its own kitchen, bath, sleeping area, and private entry. Depending on the neighborhood, you’ll hear “carriage house,” “granny flat,” “in-law suite,” or “backyard cottage.” The form factors are straightforward: internal (basement/attic conversions), attached (an addition), and detached (standalone structure). Each path carries different permitting implications, structural constraints, and value dynamics.

One practical thread the presenters returned to throughout the hour: have the value-add conversation early. In many scenarios, a detached ADU is simpler to build and creates a clearer rental product with an easier path to ROI than carving space out of a basement or attic—with the bonus that you can foreground access, daylight, and privacy from the start.

Who Benefits from ADUs in Columbus?

The short answer, as Nick put it in the room, is “pretty much everyone.” The longer answer breaks down by audience:

• Young families / first-time buyers: Rental income from a carriage house can make a mortgage in a strong school district attainable.

• Young professionals / remote workers: A self-contained home office or studio solves the “working out of the bedroom” gray area post-COVID.

• Empty nesters: Downsize into a right-sized ADU and rent the primary home to stay rooted in your neighborhood.

• Aging parents: Multi-generational living with dignity and proximity—common globally, increasingly normal in the U.S.

• Investors / owner-occupants: Lower barrier to entry than buying a whole multifamily; diversified rental strategy options (STR/MTR/LTR) with a manageable footprint.

None of this is theoretical. During Q&A, the presenters described exactly how an ADU can pencil in Victorian Village or German Village scenarios, how to stage the conversation with a real estate agent, and where owners tend to underestimate the hidden friction (neighbor relations, commission reviews, foundation realities for over-garage units, etc.).

“Gentle Density”: More Neighbors, Same Neighborhood

The phrase that anchored the presentation—gentle density—isn’t a slogan. It’s a lens. ADUs can increase housing supply without changing the street’s overall character or forcing major infrastructure upgrades. You’re building on an existing lot, tapping existing services, and preserving the front house that already tells the street’s story. If you’re trying to grow a city responsibly, that’s a powerful posture: more options, more affordability, and more neighbors—without turning every block into a construction zone or a parking debate.

What Columbus Can Borrow from LA, Minneapolis, and Portland

The case studies were instructive. Los Angeles dramatically accelerated ADU production after 2017 with a comprehensive policy stack: streamlined permitting, pre-approved plans, and financial incentives. The results: 20,000 ADU permits and ADUs accounting for roughly 22% of new housing units—a shift you can literally see on the chart. Minneapolis rewrote the rules: triplex zoning, eliminated parking minimums, simplified ADUs, and TOD-aligned density—all of which stabilized rent growth and kept production high per capita. Portland? Early to the party, waived development fees, and backed a strong culture of design-forward ADUs—see the Namaste ADU example for compact, accessible indoor–outdoor living.

The obvious lesson: comprehensive beats incremental. If you want ADUs to matter, line up policy, process, and product. If you want adoption to feel normal, educate the public and make the path legible.

Zone In Columbus: The Most Meaningful Rewrite in 70 Years

The presenters spent meaningful time on Zone In Columbus—the city’s multi-year zoning modernization, the first comprehensive update in more than seven decades. The goal is straightforward: move away from project-by-project variances, modernize for how Columbus lives and grows, and cut down the friction that slows even small, sensible projects.

The project timeline tells you this is a marathon, not a sprint. Phase 1 has already landed (corridor-focused). Phase 2 aims to touch roughly 40% of the city by 2027, expanding beyond corridors and into the fabric between them. That matters for ADUs because the ADU-specific reforms highlighted—simplified permitting with a dedicated review team, relaxed parking in transit areas, and allowance for attached and detached ADUs on qualifying lots—are the kinds of nuts-and-bolts changes that turn a six-month mystery into a predictable submittal.

During Q&A, Paul acknowledged the current “two-tracks” feeling: even with corridor reforms, historic commissions like Victorian Village can still create a parallel layer of scrutiny not yet fully harmonized with Zone In. Translation: reforms are real and helpful, but site context still rules.

How to Design Columbus ADUs People Love to Live In

The “how to” portions of the talk were instantly useful. The presenters emphasized fundamentals that make small spaces feel generous:

• Combine kitchen + living; minimize hallways; let ceilings run tall.
• Plan for a king-size bed in one good bedroom (often better than two tiny rooms).
• Think HVAC early: splits or connections for internal/attached; lower-level equipment for carriage houses.
• Pair shared and private outdoor rooms for flexibility (patio + balcony).

• Bake in universal design (door widths, thresholds, clearances, outlet placement) and pet-friendly details (durable surfaces, fenced runs).

• Right-size and distribute storage; housekeeping closets for rentals.

Nick’s guidance was frank and actionable: in A/B class neighborhoods, prioritize one excellent bedroom; in C class contexts, the conversation may shift. And don’t forget the marketing angle: universal design features can command higher rents and broader demand—thoughtful choices today preserve optionality tomorrow.

Real Costs and Returns: Why ADUs Make Financial Sense

Paul and Nick addressed costs directly and transparently. Expect a typical range of $100,000–$350,000+, driven by size, complexity, and finishes. Renovations of existing garages and basements often sound cheaper but introduce real complexity—foundations that won’t carry a second story, odd geometries that fight accessibility, and daylight compromises that undermine livability. Detached new-build ADUs are, more often than not, the most straightforward path to a high-quality unit.

On returns: a well-located ADU in Columbus offers credible rental income (leasing trends locally are strong), with flexible strategy levers (STR/MTR/LTR) to dial the operational load versus yield. Smaller footprints cost less to furnish, and in many cases, payback periods compare favorably to ground-up single-family projects.

The Sustainability Upside: Smaller, Closer, Smarter

ADUs are not just a housing-supply tactic; they’re a sustainability tactic. The big wins include: 40–60% lower energy use from compact envelopes, efficient use of existing infrastructure, and real transportation benefits when people can live closer to work or amenities. The design process itself can integrate green strategies—passive shading, solar gains, PV readiness—at a scale that doesn’t overwhelm budgets.

From Policy to Projects: A Columbus Playbook

If the point of Zone In is to get sensible projects unstuck, then ADUs are the test case. The presenters’ recommendations read like a to-do list for stakeholders:

• City: Keep aligning commissions with modernized zoning. Stand up the dedicated ADU review team and publicize the path.

• Policy makers: Consider pre-approved ADU plan libraries and fee relief pilots modeled on LA and Portland.

• Architects: Lead with site-specific feasibility + value-add scenarios. Coordinate early with real estate agents, lenders, and property managers to ground the rent/ROI conversation.

• Owners / small developers: Choose detatched new-builds where feasible; emphasize universal design and outdoor room strategies; keep future rental flexibility in mind from day one.

Why “Right Now” Matters for Columbus ADUs

Columbus is in motion: population growth continues, major employers are still investing in the region, and housing demand isn’t going to cool just because we hope it will. If we want teachers, nurses, service workers, and young families to live within the ring of our neighborhoods—not just drive in from farther and farther out—then we need more units in the places people actually want to be. ADUs are the smallest, least disruptive way to do that at scale.

Voices from the Room: Moments Worth Repeating

“Have the value-add conversation early. If a basement or attic conversion forces too many compromises, a detached carriage house is often the simpler, better product.”

“Universal design isn’t a ‘nice to have’—it’s a market advantage. It raises demand, widens your audience, and it doesn’t have to blow up the budget.”

“Zone In is the biggest modernization in 70 years. Aligning commissions and creating a dedicated ADU review path turns good ideas into permits and keys.”

Columbus ADU Checklist: Start-to-Finish on a Single Page

• Site Reality: Lot depth, alley conditions, tree canopy, utility locations, and historic or overlay districts.

• Commission & Zoning: Confirm current Zone In applicability and any commission oversight; verify setbacks, height, lot coverage, and parking context.

• Structure: Assume most existing garages are not ready for a second story; plan for rebuild and fire separation where relevant.

• Programming: One excellent bedroom (king-capable), real kitchen, compact laundry, and storage strategy that fits use (owner use vs. rental).

• Mechanical: Early HVAC strategy selection (split vs. tie-in), dedicated metering if appropriate, belt-driven garage operators for over-garage units.

• Outdoor Rooms: Pair shared and private; think morning/evening sun and privacy gradients.

• Universal Design: Door widths, zero/low thresholds, turning radii, outlet/switch placement; plan for aging in place from day one.

• Financing & Returns: Model STR/MTR/LTR options; evaluate insurance, management, cleaning, and furnishings costs; confirm rent comps in the immediate micro-location.

• Neighbors: Communicate construction staging; keep access open; offer contact info for issues; show elevations and materials that match context.

What Arcfluence Delivered at AIA Ohio—And How You Can Use It

The presentation delivered a clear-eyed, hands-on walkthrough of how Columbus ADUs move from talking point to reality—anchored in data, tested against real neighbor concerns, and connected to the Zone In reforms that can turn “we should” into “we did.” If you’re a Columbus homeowner, a small developer, or an architect advising clients, the path is increasingly navigable. The next step is bringing a specific site into the conversation and deciding which constraints are immovable and which are design problems waiting for a clever solution.

And if you missed the session, the slides make the key points legible: the housing gap chart, the LA/Minneapolis/ Portland case studies, the ADU-specific reforms coming into view, and the design heuristics that make small spaces live large. The live discussion added the texture: what commissions ask for, how to prep neighbors, and where the ROI math actually lives.

Planning a Columbus ADU? Start with a Feasibility Conversation.

Whether you’re thinking Victorian Village ADU, German Village carriage house, a Clintonville backyard cottage, or a Franklinton live–work accessory unit, the first conversation is simple: site constraints, zoning context, and program goals. From there, you can compare an over-garage concept to a ground-up detached unit, and decide what best serves your long-term plan. If you’re ready to talk through it, we’d love to help.