Looking for an addition contractor in Roslyn, SD? Describe your project once and up to three addition contractors who work in Roslyn and Day County get back to you with a quote. It's free and there is no obligation.
Roslyn is home to about 180 people (2024 Census Bureau estimate), a shrinking community (−2.2% since 2020). With 825 people per sq mi, it is a semi-rural area. Growing families here often add space instead of moving.
Roslyn at a glance
- Population (Census Bureau estimate, 2024)
- 180 (−2.2% since 2020)
- Rank in South Dakota
- 183rd of 310 cities and towns
- Land area
- 0.2 sq mi
- Population density
- 825 people per sq mi (semi-rural)
- Type
- Town (Roslyn town)
- Main county
- Day County
What to check before hiring in Roslyn
- Zoning: check Roslyn's setbacks, lot coverage and height limits first.
- License and permit: in South Dakota, additions are built by licensed contractors under a permit.
- Structure: second stories need an engineer to check the existing house.
- Price drivers: size, foundation, roof tie-in, plumbing and finishes.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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NAHB
Official information and guidance.
Services available in Roslyn
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Room addition
Ground-floor addition with foundation, framing, roof and finishes.
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Second-story addition
New floor over the existing house, with structural engineering.
Frequently asked questions in Roslyn
How much does an addition cost in Roslyn, SD?
It depends on size, foundation and finishes. Describe your project: contractors who serve Roslyn reply with a quote.
How long does it take?
Often a few months, plus design and permits.
Does an addition raise property taxes?
Usually, since it increases the assessed value.
Which addition contractors will contact me?
Up to three independent addition contractors who serve Roslyn and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.