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Not every square foot on a Sioux Falls property earns its keep, and a detached garage used only for storage is a common example. Once that space is finished into a legal unit, our property marketing services help fill it quickly instead of letting it sit vacant after all that construction work.
A second investment property in this part of South Dakota is out of reach for a lot of owners at today's prices. Building a legal unit on a lot already owned is usually the faster path to the same result.
Key Takeaways
- A second unit lets Sioux Falls owners collect additional rent without buying more land.
- South Dakota's zoning flexibility has made adding a second unit more approachable for many homeowners.
- A well-placed second unit tends to raise both monthly income and long-term resale value.
- Reviewing financing, upkeep, and screening details early helps owners avoid costly setup mistakes.
The Space That's Already Costing You Money
Most properties in this area hold at least one section that produces nothing: a detached garage, an unfinished basement, or a bonus room that only gets used a few times a year. Turning that space into something rentable generally follows a short sequence.
- Identify existing space on the property so no additional land purchase is required.
- Add a private entrance, kitchen, and bathroom to separate it from a bonus room and make it a true rental unit.
- Confirm the design meets current city and county building standards before finalizing plans.
- Complete construction, pass inspection, and lease the finished unit on its own.
We worked with a homeowner near Harrisburg whose finished basement had sat unused for close to a decade. Once he added a kitchenette and a separate entrance, he leased it within three weeks and added several hundred dollars to his total monthly income without touching his lot size.
Local Approval Has Gotten More Predictable
Many municipalities across the Sioux Falls metro have clarified their rules around accessory units in recent years, which shortens the distance between planning a unit and actually collecting rent from it. Local contractors have grown more familiar with these builds as demand has climbed, part of why nearly 1 in 5 residential units produced today in ADU-friendly states is a second unit like this one.
Placement Inside Sioux Falls Still Shapes the Rent
Not every neighborhood carries the same rental demand, so where the unit sits on the lot still matters even within a single city.
Factors Worth Weighing
Proximity to schools and major employers tends to support higher rent, and lot shape often determines whether a garage conversion or a detached structure makes more sense. Owners weighing that decision often lean on our residential guarantee programs for the main house, and extending that same standard of care to a second unit tends to protect the investment from day one.
What a Second Unit Does to Resale Value
Beyond the added rent, a second unit tends to raise what the whole property is worth to a future buyer. Appraisers in this region report a pattern similar to what the Federal Housing Finance Agency found nationally, where the median appraised value for properties with an accessory dwelling unit reached $1,064,000 in 2023, notably higher than comparable properties without one.
The Financial Details Owners Often Miss
A few surprises tend to show up once owners run real numbers on a second unit.
- Financing usually comes from home equity, a construction loan, or a cash-out refinance, and each option carries different repayment terms.
- Rental income from the unit is taxable, so depreciation, insurance, and maintenance need tracking apart from the main house.
- Utilities, landscaping, and repairs for the new unit add ongoing costs that belong in the rent calculation from day one.
Our accounting and reporting services keep this second income stream organized instead of blended into a single set of books, which simplifies tax season considerably.
Larger Builds Benefit From Coordinated Oversight
A second unit is a bigger undertaking than a simple remodel, especially when foundation work, insulation for South Dakota winters, or utility upgrades come into play. Owners tackling a project at this scale often lean on our project coordination support to keep contractors, permits, and timelines moving together instead of stalling out separately.
Keeping Two Structures in Working Order
A second unit adds more than a lease. It adds another roof, another furnace, and another set of pipes that need attention through harsh Midwestern winters. Owners who already rely on dependable coordination for their main house tend to extend that same standard to the new unit through our property maintenance services rather than treating the second structure as an afterthought.
Two Units Bring Two Sets of Landlord Responsibilities
Adding a unit means adding a second tenant relationship and a second list of ongoing concerns.
- A separate lease apart from whatever agreement covers the main house.
- A full round of screening, since background and rental history checks apply regardless of unit size.
- A second set of maintenance requests, since repairs now cover two structures instead of one.
We had a client whose second unit sat vacant longer than expected because she assumed the same tenant pool that worked for her main house would apply. Adjusting the listing to fit a smaller, standalone unit brought in qualified applicants within days.
Deciding If a Second Unit Fits Your Property
Start with what you actually want from the property before committing to a design. Steady, higher monthly income without buying another home is worth serious consideration for many owners in this market. A free rental analysis gives realistic rent expectations based on comparable properties nearby, which helps settle the question before any money goes toward plans.
Where to Find More Guidance Before Building
Owners considering this step often have questions that go beyond rent projections, from zoning specifics to how a second tenant affects insurance coverage. Our owner resources page covers many of these topics in more depth, giving property owners a starting point before they commit to a contractor.
FAQs about ADUs as a Rental Income Strategy in Sioux Falls, SD
Does frost depth affect how a second unit's foundation needs to be built here?
Yes, foundations typically need to extend below the local frost line, often around forty-two inches in this region. A licensed contractor familiar with area codes can confirm the right depth for your lot.
Can I convert an existing garage into a second unit without expanding its footprint?
Often yes, provided the structure meets minimum ceiling height and can accommodate plumbing and electrical additions. A contractor walkthrough early on confirms whether the existing shell works.
How does adding a second unit affect snow removal responsibilities on my property?
Most owners handle snow removal for both structures themselves or through a shared service. Clarifying this in each lease avoids confusion once winter weather actually arrives.
Will my homeowners insurance need to change once a second unit is rented?
Likely yes, since insurers typically require updated coverage for an additional structure and tenant. Contacting your provider before leasing avoids gaps in coverage.
What's a realistic timeline for finishing a second unit in this climate?
Many projects plan around a single warm-weather season, since exterior work often pauses through winter months. Budgeting for that seasonal gap keeps expectations realistic from the start.
A Finished Second Unit Rarely Stays Empty for Long
A finished second unit rarely stays empty for long, especially once a first rent check clears alongside the original one. Owners who make the build often say the same thing afterward: that the return showed up faster than expected once permitting and construction were behind them.
PMI Sioux Empire helps owners move through that process, from permitting to the first tenant move-in, without losing momentum along the way. Run the return potential calculator on your own property to see what a second unit could realistically add to your income.
