Decision guide
Addition vs. ADU in Polk County
Both add square footage, but they serve different goals and go through different approval processes in Polk County. The decision usually comes down to whether you want more living space or an income-generating unit.
Side by side
| Home addition | ADU (accessory dwelling unit) | |
|---|---|---|
| Typical cost | $150–$300 per sq ft | $100,000–$200,000+ all-in |
| Permitting | Standard Polk County building permit | Zoning approval, utility connections, setback rules, occupancy requirements |
| Primary use | More living space for your household | In-law suite, multigenerational living, or rental income unit |
| ROI | Adds directly to appraised value | Rental income stream plus some appraised value |
Contractor's perspective
Our honest take
An ADU is a long-term income play, not a quick space solution. If you need a guest room or a home office, an addition is simpler, faster, and doesn't come with the zoning complexity. If you want $1,200–$1,800 per month in rental income for the next 20 years, or you have aging parents who need to live close but independently, the ADU math pencils out — but plan for a longer permitting timeline in Polk County.
Choose Home addition when
You need more living space for your own household, want a simpler permitting path, or the timeline is a factor.
Choose ADU (accessory dwelling unit) when
You have family who needs nearby-but-independent space, you want rental income, your lot and zoning support it, or you're planning a long-term hold on the property.
Not sure which way to go?
Tell us about your space and what you're weighing. We'll give you a straight answer and a quote — no sales pitch.