The Comprehensive Economics Of Accessory Dwelling Unit Development In Minnesota

The Comprehensive Economics of Accessory Dwelling Unit Development in Minnesota: A 2026 Technical and Regulatory Analysis
The residential landscape in Minnesota as of April 2026 is defined by a rigorous pursuit of “Missing Middle” housing solutions, with Accessory Dwelling Units (ADUs) serving as the primary instrument for suburban densification and urban infill. As the state navigates a chronic housing shortage, the economic viability of these units is dictated by a convergence of escalating material costs, stringent environmental engineering requirements, and a volatile legislative environment that pits state-level preemption against municipal autonomy. In this market, a standard ADU typically requires an investment ranging from $125,000 to $350,000, although high-performance detached units in premium markets frequently exceed $400,000. This analysis provides a peer-level examination of the structural, environmental, and regulatory variables that define the 2026 Minnesota ADU market, offering a comprehensive dataset for developers, policy analysts, and homeowners.
Macroeconomic Context and the 2026 Housing Crisis
To understand the current cost structure of ADUs, one must first consider the broader Minnesota real estate environment. By early 2025, median home values in the state reached approximately $340,000, a figure that continued to climb into 2026 as inventory remained constrained. This appreciation has driven a surge in ADU interest, as homeowners seek to leverage existing equity to create multi-generational housing or supplemental rental income. However, the cost to build has also risen; residential construction costs in Minnesota have experienced a year-over-year increase of 3.5% to 4.5% in 2026, with total increases reaching 25% to 35% compared to pre-pandemic 2019 levels.
Labor markets in the Midwest, while more competitive than the coastal regions, remain tight. In 2026, average skilled labor rates for construction trades in Minnesota run approximately $51 per hour, with specialized multi-family and accessory unit contractors commanding between $38 and $58 per hour depending on regional demand. These rates are approximately 6% above the national average, reflecting the specialized skills required for northern climate construction.
Economic Indicator (Minnesota 2026)
Value / Rate
Trend (YoY)
Median Home Value (Statewide)
~$355,000
+4.2%
Avg. Skilled Labor Rate
$51/hr
+3.5%
Construction Cost Multiplier
1.06x National Avg
Stable
Softwood Lumber Futures
$530 – $557 / MBF
Stabilizing
Ready-Mix Concrete Inflation
4% – 6%
Increasing

Structural Typologies and Primary Cost Drivers
The “chassis” or structural form of the ADU is the single largest determinant of the total project budget. In the 2026 market, the preference for detached new construction remains high for privacy reasons, despite its status as the most expensive option. Conversely, internal conversions provide a lower barrier to entry but are limited by the existing home’s footprint and structural integrity.
Detached Accessory Dwelling Units (DADUs)
Detached ADUs represent the “full-build” scenario, requiring a new foundation, a complete building envelope, and independent utility lateral runs. In Minnesota, these projects typically start at $300 per square foot, with complex or premium designs reaching $450 per square foot. The total expenditure for a detached unit is often double that of an internal conversion due to the lack of shared infrastructure.
In 2026, a 512-square-foot detached unit built with high-performance materials—such as steel framing, fiber cement cladding, and standing seam metal roofing—is estimated to cost $346 per square foot before general contractor markups. When factoring in a 20% contractor fee and architectural administrative costs, the final price tag for such a unit reaches approximately $177,354. This reflects a shift toward “performance-driven” accessory housing that prioritizes longevity and thermal efficiency over sheer square footage.
Attached ADUs and Additions
Attached ADUs, or “bump-outs,” share at least one structural wall with the primary residence. While this theoretically reduces exterior cladding costs, the structural integration often proves complex. Engineering the tie-in between the new roofline and the existing structure requires precision to prevent ice damming—a major concern in Minnesota winters. Attached units in 2026 typically range from $125,000 to $280,000 total, or approximately $250 to $375 per square foot.
A significant portion of the cost in attached units is attributed to fire-separation requirements. Under the 2026 Minnesota Residential Code, an attached ADU must be fully separated from the main residence by means of a fire-rated wall or floor assembly, and it must possess a separate entrance. If the unit is connected via an internal door, that door must meet specific fire-rating and self-closing standards to maintain the autonomy of the two living units.
Internal Conversions and Basement Finishing
Converting a basement or attic remains the most budget-friendly path to ADU creation, with costs ranging from $60,000 to $150,000. These projects benefit from the existing foundation, roof, and exterior shell. However, the 2026 cost of internal conversions is rising due to increased enforcement of egress and ceiling height requirements.
A typical basement ADU conversion in the Twin Cities metro involves:
Egress Windows: Cutting through concrete foundations to install code-compliant exits.
Plumbing Retrofits: Grinding concrete floors to install sewer ejector pumps or new waste lines for bathrooms and kitchens.
Moisture Mitigation: High-grade vapor barriers and sub-slab drainage to prevent the “basement smell” and mold issues prevalent in older Minnesota homes.
ADU Typology
Average Total Cost (2026)
Price per Sq. Ft.
Level of Difficulty
Detached (New Build)
$200,000 – $400,000
$300 – $450
High
Above-Garage ADU
$180,000 – $300,000
$325 – $425
Very High
Attached Addition
$125,000 – $280,000
$250 – $375
Medium
Basement Conversion
$60,000 – $150,000
$150 – $250
Low
Garage Conversion
$80,000 – $180,000
$150 – $400
Medium

The Minnesota Environmental Premium: Engineering for the 42-Inch Frost Line
Construction in Minnesota is governed by the state’s extreme climate, which imposes a set of “environmental taxes” on every project. The most significant of these is the frost line requirement. In the southern half of the state, foundations must extend at least 42 inches below grade to prevent heaving during the winter freeze-thaw cycles.
Foundation Economics and Excavation
For a detached ADU, foundation work accounts for 15% to 25% of the total budget. In 2026, the cost of a foundation for a typical 400-to-800-square-foot ADU ranges from $20,000 to $50,000. This includes excavation, gravel base, vapor barriers, perimeter insulation (often R-10 or higher), and the concrete pour.
Excavation pricing in the Midwest entering 2026 averages $7.00 per cubic yard for standard loam or clay soil, but this figure is misleading for foundation work, which requires precise depth control and safety measures. Foundation-specific excavation averages $11.50 per cubic yard. If a site encounters rocky soil or buried rock ledges—common in areas like Duluth or parts of the St. Croix River Valley—excavation costs can exceed $50,000.
Utility Trenching Below the Frost Line
Connecting a detached unit to the main house’s utilities is a major cost escalator. Because water and sewer lines must remain below the frost line, trenches must be dug deeper than the standard 24-inch electrical trench. As of February 2026, the national average for standard utility trenching is $5 to $12 per linear foot, but deep Minnesota-grade trenching often reaches $18 to $30 per linear foot.
The complexity of utility runs is illustrated by the following 100-foot power and water service lateral:
Trenching Labor and Equipment: $800 to $1,800.
Conduit and Materials: $5.50 to $25.00 per linear foot.
Surface Restoration: Cutting through an existing asphalt driveway or restoring a landscaped lawn can add $4 to $12 per linear foot.
Utility Connections: Many Minnesota cities, such as Edina and Blaine, require that the ADU connect to the same service lines as the main home rather than allowing a separate street tap, which simplifies the municipal side but complicates the on-site engineering.
The 2026 Regulatory Landscape: A Pivotal Year for Zoning
The year 2026 marks a historic shift in Minnesota housing policy. After years of legislative debate, state-level mandates are beginning to override municipal restrictions that have historically functioned as de facto bans on ADUs.
State Preemption and the “Starter Home Act”
The centerpiece of the 2026 reform is the “Minnesota Starter Home Act” (HF3895/SF4123), which aims to modernize antiquated zoning codes. The act targets several regulatory barriers that have historically inflated ADU costs. Key provisions being debated or implemented in early 2026 include:
Minimum Lot Size Reform: Prohibiting cities from requiring lots larger than 2,000 square feet for residential structures, thereby making ADUs viable on smaller urban parcels.
Administrative/Ministerial Review: Requiring cities to approve ADU applications through a “checklist” process rather than subjective public hearings, which reduces project timelines and legal fees.
Parking Mandate Bans: Prohibiting municipalities from requiring additional off-street parking for ADUs, a rule that previously forced homeowners to paved over green space at a cost of $5,000 to $10,000.
The Conflict of Local Control: Blaine and Edina
Despite state pressure, some municipalities have mounted a “Granny Flat Rebellion”. The city of Blaine is a prominent example; in early 2026, the Blaine City Council introduced an ordinance (ORD 26-2601) to ban detached ADUs entirely while retaining attached units. This move followed a local controversy where a proposed ADU for homeless families sparked neighborhood pushback, leading to a temporary moratorium on all ADU permits until June 2, 2026.
In contrast, Edina legalized ADUs in 2024, but with strict performance standards that remain in effect for 2026. Edina limits ADUs to 1,000 square feet and strictly prohibits their use as short-term rentals like Airbnb. These local variations mean that a homeowner in Minneapolis might spend $5,000 on permits and have their project approved in 14 days, while a neighbor in a nearby suburb might face $25,000 in fees and a 6-month discretionary review process.
Detailed Case Study: Dayton, MN Planning Commission Updates (March 2026)
The City of Dayton provides a clear window into how local governments are adapting to the 2026 housing mandates. According to the Planning Commission packet from March 5, 2026, Dayton has revised its ADU ordinance to align with state-friendly standards while maintaining high architectural quality.
Developmental Standards in Dayton
Dayton’s 2026 standards represent a “middle path” in ADU regulation:
Unit Size: The maximum size for a detached ADU has been expanded to 1,200 square feet, significantly higher than the previous 800-square-foot limit. Attached ADUs are capped at 50% of the primary dwelling’s area or 1,000 square feet, whichever is greater.
Setbacks: To facilitate development on smaller lots, side and rear setbacks have been reduced to just 4 feet.
Architectural Integration: Dayton requires that the exterior materials (siding color, roof pitch, and trim) match the principal structure. This prevents the “storage shed” look that often triggers neighborhood complaints.
Owner Occupancy: In a major shift, Dayton has suspended its owner-occupancy requirement for all units permitted between 2025 and 2030, allowing both the main house and the ADU to be rented out simultaneously—a move designed to attract small-scale developers.
Dayton Permit and Plan Check Fees
The cost of legality in Dayton is strictly defined by the 2026 Fee Schedule. For a typical $150,000 ADU project, the fees would be calculated as follows:
Base Permit Fee: Calculated from the valuation table. For a $150,000 build, the fee starts at $993.75 for the first $100,000 plus $5.60 for each additional $1,000 ($280), totaling $1,273.75.
Plan Check Fee: 65% of the permit fee ($827.94).
State Surcharge: $75.00 (based on 0.0005 of valuation).
Total Estimated Permit Cost: ~$2,176.69.
Notably, Dayton offers a 25% discount on permit and plan check fees for homes 20 years or older, recognizing that retrofitting older neighborhoods is more challenging than new construction.
Dayton Fee Item
Cost / Calculation
Accessory Building 200–1,250 sq ft
$300 + $1 Surcharge
Accessory Building > 1,250 sq ft
$400 + $1 Surcharge
Plan Review Fee (Standard)
65% of Permit Fee
Plan Review (Master Plan Construction)
25% of Permit Fee
Re-inspection Fee (after 2nd)
$100
Residential Mechanical Permit
$100

Technical Systems: HVAC and Thermal Resilience in -30°F Conditions
In Minnesota, an ADU is only as viable as its thermal management system. The 2026 market has seen a departure from standard residential HVAC toward specialized systems capable of handling the state’s extreme temperature swings.
The Rise of Cold-Climate Heat Pumps
While the national average for HVAC installation in a small unit ranges from $5,000 to $12,500, Minnesota projects frequently land at the $10,500 to $15,900 mark. This “Minnesota premium” is largely due to the adoption of Cold-Climate Air Source Heat Pumps (ccASHPs).
Standard heat pumps lose efficiency as temperatures drop below freezing. Modern inverter-driven systems, such as the Daikin Fit or Mitsubishi Hyper-Heat, can provide effective heating down to -13^{\circ}F or even -22^{\circ}F. These systems cost between $12,000 and $19,000 installed but are essential for ADUs that do not have access to natural gas lines.
Backup Heating and Redundancy
Many ADU designs in 2026 incorporate electric resistance “cove” heaters or radiant floor heating as a secondary backup. In a detached ADU, a frozen pipe can cause $10,000+ in damage in a single night. Consequently, investment in ultra-high efficiency variable speed systems is common, with high-end packages exceeding $20,000.
HVAC System Type
Typical Installed Cost (2026)
Best Use Case
Supplemental Mini-Split
$5,500 – $12,000
Add-on for conversions
High-Efficiency Central AC
$8,500 – $12,000
Attached additions
Inverter AC / Cold Climate HP
$10,500 – $19,000
Detached all-electric units
Dual-Fuel (Gas + Heat Pump)
$12,000 – $19,000
Large detached units

Soft Costs: The Price of Professional Planning
Beyond the “sticks and bricks,” soft costs represent 10% to 20% of the ADU budget in 2026. These fees are critical for navigating the increasingly complex building codes and municipal requirements.
Architectural and Engineering Fees
Architectural fees for residential projects in the Midwest typically range from 5% to 11% of construction costs, significantly lower than the 10% to 18% seen on the West Coast. For a $200,000 ADU, homeowners should budget $15,000 to $45,000 for a full-service architect who manages everything from concept through construction administration.
Structural engineering is nearly always required for detached ADUs in Minnesota to verify snow load capacity. In Minneapolis, structural engineers charge between $110 and $150 per hour. A standard set of structural drawings for a home addition or detached unit averages $3,000 to $5,000. If a homeowner already has plans and simply needs a Professional Engineer (PE) stamp for permit approval, they can expect to pay $400 to $1,000 for a plan review.
Surveys and Environmental Tests
Minnesota’s varied topography—from the Iron Range to the river valleys—makes site prep unpredictable.
Land Surveys: Required by most cities to prove setbacks ($3,000 – $7,000).
Tree Protection Plans: Cities like Edina require a detailed tree survey and protection plan, which can add $1,000 to $2,500 to the pre-construction phase.
Watershed Permits: Depending on the project’s proximity to Minnehaha Creek or Nine Mile Creek, a watershed permit may be required, adding several weeks and $500 to $2,000 in fees.
Finishes and Quality Tiers: Standard vs. Premium
Interior finishes are where ADU budgets either stabilize or skyrocket. In 2026, there is a distinct move toward “Premium-Standard” finishes—materials that look luxury but are selected for their durability in rental environments.
Standard/Builder-Grade Selections
A builder-grade ADU focuses on functionality. Standard finishes include:
Flooring: Luxury Vinyl Plank (LVP) or laminate ($4–$8/sq ft installed).
**Countertops: High-definition laminate or basic granite ($25–$60/sq ft).
Siding: Vinyl or basic fiber cement ($6–$10/sq ft).
Premium/Custom Selections
Premium ADUs, often used as primary residences for aging parents (“granny flats”) or luxury rentals, incorporate high-end materials that add 20% to 40% to the base construction cost.
Countertops: Engineered quartz brands like Cambria ($75–$150/sq ft).
Flooring: Engineered hardwood or high-end tile ($12–$25/sq ft).
Exterior: Clear cedar planks or standing seam metal wainscoting.
Roofing: Standing seam metal ($9.00/sq ft) compared to asphalt shingles ($4.50/sq ft).
Material Category
Standard Option (Cost)
Premium Option (Cost)
Impact on Longevity
Roofing
Asphalt Shingles ($4.50/sf)
Standing Seam Metal ($9/sf)
High (50+ years)
Exterior Cladding
Vinyl Siding ($6/sf)
Fiber Cement ($10/sf)
Medium (Fire/Ice res.)
Countertops
Laminate ($30–$60/sf)
Cambria Quartz ($75–$150/sf)
High (Non-porous)
Insulation
Batt Insulation
Closed-Cell Spray Foam
High (Thermal break)

Investment Potential and Financial Performance
The 2026 Minnesota market treats ADUs as a “safe-haven” asset. While the construction cost is high, the return on investment (ROI) is bolstered by the extreme scarcity of housing.
Rental Income Dynamics
In the Twin Cities metro, a studio or 1-bedroom ADU can command $2,200 to $2,800 in monthly rent. This compares favorably to markets like Seattle ($1,800–$2,500) or Denver ($1,600–$2,300), largely due to the lack of competitive 1-bedroom inventory in high-demand suburbs like Edina or Minnetonka.
Value Appreciation and Payback
A professionally built ADU typically increases the property’s total value by $180,000 or more. The payback period—the time it takes for rental income to cover the cost of the loan—ranges from 5 to 7 years in 2026. This is accelerated by tax advantages; many homeowners can deduct the interest on their construction loans or depreciate the unit as a business asset.
Emerging Financing Models
Traditional lending has been a bottleneck for ADUs, but 2026 has introduced new tools:
USDA Section 502(h): The Rural Housing Service’s proposed rule in March 2026 would allow for income-producing ADUs to be financed as part of the initial mortgage in qualifying rural and suburban-fringe areas.
ADU-Specific Construction Loans: Lenders are now offering products that lend based on the “After-Repair Value” (ARV) of the home plus the ADU, rather than current equity alone, with loan amounts ranging from $50,000 to $400,000.
The Road Ahead: 2027 and Beyond
As Minnesota enters the second half of 2026, the ADU market is expected to stabilize as cities finish their mandated zoning updates. The “Missing Middle” housing movement has shifted from a theoretical policy goal to a practical construction reality.
However, challenges remain. The Short-Term Rental (STR) debate continues to simmer; while cities like Edina have banned STRs in ADUs to protect long-term housing stock, other municipalities are considering allowing them to help homeowners offset the high cost of construction. Furthermore, the construction of “Multi-Unit ADUs” (up to two per lot) is being studied in St. Paul as a way to further maximize land use.
For professionals in the field, the 2026 data confirms that success in the Minnesota ADU market requires a trifecta of expertise: understanding the technical engineering of the frost line, navigating the shifting sands of state and local law, and managing the high expectations of a homeowner population that views these units as both a family legacy and a financial powerhouse.
The accessory dwelling unit has transcended its origins as a “granny flat” to become a cornerstone of the Minnesota housing market—a compact, high-performance solution for a state that desperately needs more places to call home.
Works cited
1. Minnesota ADUs – Floor Plans & Builders – DC Structures, https://dcstructures.com/minnesota-prefab-adus/ 2. How Much Does it Cost to Build an ADU in Minneapolis? – Hanson Remodeling, https://hansonremodeling.com/cost-to-build-an-adu-in-minneapolis/ 3. Free ADU Cost Calculator – Estimate Your ADU Construction, https://www.gatheradu.com/pricing 4. Multi-Family Home Construction Cost in Minnesota | 2026 Calculator & Pricing Guide, https://costtoconstruct.com/cost/multi-family/minnesota 5. Minnesota Concrete Calculator 2026 – CostFlowAI, https://costflowai.com/calculators/concrete/minnesota/ 6. ADU Construction Cost: What a 512 sq ft Costs to Build in 2026 – Design with Frank, https://www.designwithfrank.com/blogs/building-guide/adu-construction-cost-512-sqft-steel-cabin 7. ADU Construction Cost Guide: 2026 Pricing & Budget Tips – SelfStorage.com, https://www.selfstorage.com/blog/adu-construction-cost/ 8. Accessory Dwelling Units (ADUs) | Edina, MN, https://www.edinamn.gov/2056/Accessory-Dwelling-Units-ADUs 9. Minnesota HVAC Calculator 2026 | CostFlowAI, https://costflowai.com/calculators/hvac/minnesota/ 10. Complete Guide to ADU Costs – Great Lakes Tiny Home, https://greatlakestinyhome.com/adu-costs/ 11. Average Excavation Cost Per Yard by Region: 2026 Report – Kitching & Co, https://kitchingco.com/uncategorized/average-excavation-cost-per-yard-by-region-2026-report/ 12. Cost to build a house in 2026: Per square foot breakdown | reAlpha Tech Corp. (AIRE), https://www.realpha.com/blog/cost-to-build-a-house 13. How Much Does a Foundation Cost Per Square Foot? – USA Estimators, https://estimators.us/foundation-cost-per-square-foot/ 14. Cost to Trench per Foot in Residential Projects – CountBricks, https://www.countbricks.com/post/cost-to-trench-per-foot 15. How Much Does Trenching Cost Per Foot? (2026) – HomeGuide, https://homeguide.com/costs/trenching-cost 16. What is the Average Cost of Utility Trenching in Snohomish County? – In-Depth Excavation, https://indepthex.com/how-much-does-utility-trenching-cost-in-snohomish-county/ 17. Utility Trenching Cost Calculator – DEVCO Development and Engineering, https://developmentandengineering.com/utility-trenching-cost/ 18. ORD 26-2601 Ordinance Approving Amendments to Residential Sections and Performance Standards of the – Blaine, MN, https://www.blainemn.gov/m/newsflash/home/detail/3817 19. Re: HF 3895 Igo – Starter Home Act March 19, 2026 Chair Quam, Chair Freiberg and Members of the MN Elections & Gov. Ops. C, https://www.house.mn.gov/comm/docs/L09sVK4sI0q8Om5fB8vPqg.pdf 20. TESTIMONY – Minnesota House of Representatives, https://www.house.mn.gov/comm/docs/lcqRq-GKqECb-sfVTebxBQ.pdf 21. State Legislatures and Housing Reform 2026 Edition – Housing Affordability Institute, https://www.housingaffordabilityinstitute.org/housing-reform-2026/ 22. Planning Commission – City of Dayton, https://www.daytonmn.gov/government/planning_commission.php 23. Proposed Code Update:, https://civicclerk.blob.core.windows.net/stream/PRESCOTTAZ/244a46ab-abe1-4264-bfb0-9fa9126d1bf0.pdf?skoid=4bbe46ab-1a20-44be-a870-cd3e30527573&sktid=c26badce-f52a-4b54-be8d-3d9cd095d0e4&skt=2026-03-30T21:17:33Z&ske=2026-03-31T21:17:33Z&sks=b&skv=2022-11-02&sv=2022-11-02&st=2026-03-31T01:36:31Z&se=2026-04-07T01:36:31Z&sr=b&sp=rw&sig=tua3p36CDoaKXa1OjE8dEDnDzG9n1cf2bjoHZbCyN5w= 24. The Granny Flat Rebellion: Preempting Local ADU Restrictions – SMU Scholar, https://scholar.smu.edu/cgi/viewcontent.cgi?article=5067&context=smulr 25. Council holds first reading on ADU code changes that would remove detached units, https://citizenportal.ai/articles/7702496/Minnesota/Anoka-County/Blaine/Council-holds-first-reading-on-ADU-code-changes-that-would-remove-detached-units 26. They Tried To Build a Tiny Home To Help Families in Need—So Why Did Their City Council Ban ADUs in Response? – Realtor.com, https://www.realtor.com/news/trends/adu-tiny-home-blaine-mn-lawsuit/ 27. First Reading to Adopt an Interim Ordinance for a Moratorium on Accessory Dwelling Units (Case File – Blaine, MN, https://www.blainemn.gov/CivicAlerts.aspx?AID=3550&ARC=5771 28. Frequently Asked Questions – CivicPlus.CMS.FAQ – Edina, MN, https://www.edinamn.gov/faq.aspx?TID=105 29. Dayton City Zoning Code – Zoneomics, https://www.zoneomics.com/code/dayton-MN/chapter_37 30. 2026 Fee Schedule | Dayton, MN, https://www.daytonmn.gov/Documents/I Want To/View/2026 Fee Schedule.pdf 31. Trenching Cost [2026 Data] | Angi, https://www.angi.com/articles/trenching-cost.htm 32. How Much Does It Cost to Replace an Air Conditioner in Minnesota? (2026 Guide), https://ontimeservicepros.com/how-much-does-it-cost-to-replace-an-air-conditioner-in-minnesota-2026-guide/ 33. HVAC Replacement Cost in 2026: Prices, Factors, and Options – Fuse Service, https://fuseservice.com/hvac-replacement-cost-in-2026/ 34. How Much Should a New HVAC System Cost in 2026? – Poormans Heating & Air, https://www.poormansheating.com/blog/hvac/fort-wayne-hvac/how-much-should-a-new-hvac-system-cost-in-2026/ 35. Understanding the Cost of a New HVAC System: 2026 Guide, https://www.budgetheating.com/understanding-the-cost-of-a-new-hvac-system-guid/ 36. Average Architect Fees Residential: 2026 Report – Best Architecture Services Lake of the Ozarks – TXR AC, https://www.txrac.com/blog/average-architect-fees-residential 37. How Much Does a Structural Engineer Cost in Minneapolis, MN? – Angie’s List, https://www.angi.com/articles/how-much-does-structural-engineer-cost/mn/minneapolis 38. Cambria Countertops: Data-Backed Pros and Cons for Smart Homeowners, https://www.dreamhomeworks.com/countertops-remodeling/cambria-countertops/ 39. Free USA Residential Home Building Cost Calculator – TimeTrex, https://www.timetrex.com/resources/usa-residential-home-building-cost-calculator 40. Aspect ADU | Prefab Backyard Guest House | Studio Home, https://www.studio-home.com/products/aspect 41. Single Family Housing Guaranteed Loan Program-Income Producing Accessory Dwelling Unit (ADU) Provisions – Federal Register, https://www.federalregister.gov/documents/2026/03/31/2026-06173/single-family-housing-guaranteed-loan-program-income-producing-accessory-dwelling-unit-adu 42. 1-4 Unit Housing Study Frequently Asked Questions (FAQ) | Saint Paul Minnesota, https://www.stpaul.gov/departments/planning-and-economic-development/planning/current-activities/1-4-unit-housing-study/1