Market Selection Framework

Not Every Market Is an ADU Market

An ADU strategy that prints money in Portland might lose money in Indianapolis. The economics are entirely market-dependent. Before you source a deal, you need to understand whether your target market actually supports ADU investing — and which ADU strategy it supports best.

This chapter gives you a scoring framework to evaluate any market in the country for ADU investment viability.

The Seven Factors That Determine ADU Viability

Factor 1: Regulatory Environment

This is the gatekeeper. If local regulations don't allow ADUs or make permitting unreasonably difficult, nothing else matters.

What to evaluate:

• Does the state have ADU preemption legislation? (If yes, local restrictions are limited)
• Does the city/county have a specific ADU ordinance? (If no, you may be working through conditional use permits — slower and riskier)
• What's the permitting timeline? (Under 90 days is good. Over 6 months is a project risk.)
• Are there owner-occupancy requirements? (Deal-breaker for some investor strategies)
• What are the impact fees? ($0–$5K is manageable. $20K–$30K changes your underwriting.)
• Is there a history of ADU permits being approved? (Check the city's permit database)

Scoring:

• 5 = State preemption + streamlined local process + low fees
• 3 = ADU ordinance exists but moderate restrictions and fees
• 1 = No ADU ordinance, conditional use required, high fees or long timelines

Factor 2: Rent-to-Construction-Cost Ratio

The fundamental question: does the rent an ADU will generate justify what it costs to build?

How to calculate:

Monthly ADU Rent ÷ Total ADU Construction Cost = Monthly Yield on Construction

Example: $1,500/month rent ÷ $100,000 construction cost = 1.5% monthly yield (18% annualized)

Benchmarks:

• Above 1.2% monthly yield: strong ADU market
• 0.8% – 1.2%: workable, but watch your costs
• Below 0.8%: the numbers are tight — only works with very low construction costs or very high ARV uplift

Scoring:

• 5 = Monthly yield above 1.5%
• 3 = Monthly yield between 0.8% and 1.2%
• 1 = Monthly yield below 0.8%

Factor 3: Lot Characteristics

ADUs need space. If the typical residential lot in your target market is 3,000 sq ft with the house taking up most of it, detached ADUs won't work.

What to evaluate:

• Average residential lot size (5,000+ sq ft is ideal for detached ADUs)
• Typical setback requirements (how much buildable area remains after setbacks?)
• Lot coverage limits (what percentage of the lot can structures cover?)
• Prevalence of garages or outbuildings suitable for conversion
• Topography (flat lots are cheaper to build on than sloped)
• Alley access (common in older neighborhoods — great for detached ADU access without disrupting the front yard)

Scoring:

• 5 = Large lots, generous setbacks, many conversion-ready structures
• 3 = Adequate lot sizes but some constraints on buildable area
• 1 = Small lots, restrictive coverage limits, few conversion candidates

Factor 4: Construction Costs

Construction costs vary dramatically by market. A unit that costs $100/sq ft to build in Texas might cost $250/sq ft in coastal California.

What to evaluate:

• Per-square-foot construction cost for residential (get bids or talk to local contractors)
• Contractor availability (tight labor markets = higher costs and longer timelines)
• Material costs (supply chain and regional pricing)
• Permit and inspection fees
• Impact fees, school fees, utility connection fees

Scoring:

• 5 = Construction costs under $150/sq ft all-in
• 3 = $150 – $250/sq ft
• 1 = Above $250/sq ft

Factor 5: Property Values and ARV Potential

The after-repair value determines your equity position and your exit options.

What to evaluate:

• Current median home price in target neighborhoods
• Sales comps for properties WITH legal ADUs vs. without (this spread is your value-add)
• Appraiser familiarity with ADU valuations (newer ADU markets may lack comps)
• Price-per-unit metrics for small multifamily in the area (this is what your improved property competes with)

Scoring:

• 5 = Clear ARV uplift from ADU addition, strong comp support, experienced appraisers
• 3 = Some comparable sales, moderate uplift expected
• 1 = No ADU comps available, uncertain value impact

Factor 6: Rental Demand

A beautiful ADU that sits vacant doesn't generate returns.

What to evaluate:

• Vacancy rates (below 5% = strong demand)
• Population growth trends
• Employment centers and major employers
• Proximity to transit, universities, hospitals, military bases (these drive ADU-specific demand)
• Short-term rental demand (if STR is part of your strategy)
• Median household income relative to asking rents (affordability drives occupancy)

Scoring:

• 5 = Sub-3% vacancy, strong population growth, multiple demand drivers
• 3 = 3–6% vacancy, stable population, at least one demand driver
• 1 = Above 6% vacancy, flat or declining population

Factor 7: Investor Competition

Early-mover advantage is real in ADU markets. If ADUs are already prevalent and rents are being competed down, your margins shrink.

What to evaluate:

• How many ADU permits have been pulled in the last 12–24 months?
• Are there ADU-specific developers or builders already operating at scale?
• Are ADU rental listings sitting on the market or leasing quickly?
• Is the market in the "education" phase (few investors know about ADU potential) or the "saturation" phase?

Scoring:

• 5 = Low ADU activity, early-mover opportunity
• 3 = Moderate ADU activity, market is growing but not saturated
• 1 = High ADU activity, rental rates being competed down

The ADU Market Scorecard

Rate your target market on each factor (1–5) and total the score:

Interpreting your score:

• 28–35: Prime ADU market. Move fast. The fundamentals are strong across the board. These markets don't stay under the radar for long.
• 21–27: Solid ADU market. Workable with the right strategy and deal selection. Identify which factors are holding the score back and determine if you can work around them.
• 14–20: Marginal ADU market. Specific deals may work, but the market doesn't broadly support the strategy. You'll need exceptional execution and deal selection.
• Below 14: Look elsewhere. The market fundamentals don't support ADU investing at this time. Revisit if regulations change or rental demand shifts.

Market Tier Examples

Tier 1 Markets (Score 28+)

These markets typically have state-level ADU preemption, strong rental demand, and favorable construction economics:

• Los Angeles metro — massive lot supply, state preemption, strong rents, but high construction costs. Works best for conversions and lot splits where land value drives returns.
• Portland, OR — progressive ADU policy, moderate construction costs, strong rental market. Ground-up ADUs pencil well here.
• Sacramento, CA — lower acquisition costs than coastal CA, same state preemption, growing rental demand.
• Austin, TX — strong population growth, evolving ADU regulations, lower construction costs than coastal markets.
• Seattle/Tacoma, WA — state preemption via HB 1337, strong rents, tech-driven demand.

Tier 2 Markets (Score 21–27)

Strong in some factors, weaker in others. Strategy selection matters more:

• Denver, CO — good demand but higher construction costs and evolving (not yet state-preempted) ADU regulations.
• Raleigh-Durham, NC — strong growth but ADU policy is city-by-city and still maturing.
• Phoenix/Mesa, AZ — growing ADU acceptance, lower construction costs, but lot sizes in some areas are constrained.
• Nashville, TN — strong rental demand but limited ADU-specific regulation and high construction costs.

Tier 3 Markets (Score 14–20)

Possible but challenging. You need an edge:

• Atlanta, GA — city of Atlanta has ADU provisions but suburban jurisdictions vary widely.
• Boise, ID — strong growth market but limited ADU framework.
• Midwest markets (Columbus, Indianapolis, Kansas City) — low construction costs but rents may not justify the build. Garage conversions at the lowest cost tier might work.

Going Deeper: Submarket Analysis

A metro-level score is a starting point, not a conclusion. ADU viability varies block by block. Within any metro, you need to drill into specific neighborhoods:

• Which zip codes have the right lot sizes? Pull GIS data or drive neighborhoods to identify areas with garage inventory or buildable lots.
• Where are the rent pockets? Rents near a university campus or hospital may be 20–30% higher than a neighborhood two miles away.
• Where are the comps? Find the neighborhoods where ADUs have already been built and sold or rented. Those comps de-risk your appraisal.
• Where is the path of progress? Gentrifying neighborhoods where values are rising are ideal — you capture both the ADU value-add and market appreciation.

Using RISE for Market Validation

Once you've scored a market using the framework above, validate it with numbers:

1. Open RISE at rise.revcaplending.com
2. Select the scenario type that matches your strategy
3. Input market-specific numbers:
   • Average purchase price for your target property type
   • Estimated ADU construction cost (get at least two contractor bids)
   • Projected ARV based on comparable sales
   • Local carrying costs (taxes, insurance, utilities at local rates)
4. Review the Returns Summary:
   • Is the Net Profit positive with a reasonable margin?
   • Is the Cash-on-Cash ROI above your hurdle rate?
   • Is the Margin of Safety above 10%? (Below 5% means one cost overrun wipes your profit)
5. If the numbers don't work in RISE, the market — or at least that specific deal profile — isn't right for you. Adjust your assumptions or move to a different market.