Niewohner Construction Inc
Excavating contractor
Serving Onawa, IA
No phone or website on file.
Location: 309 E Iowa Ave, Onawa, IA 51040From Google Business Profile
Hours
| Monday | 8 AM–4 PM |
| Tuesday | 8 AM–4 PM |
| Wednesday | 8 AM–4 PM |
| Thursday | 8 AM–4 PM |
| Friday | 8 AM–4 PM |
| Saturday | Closed |
| Sunday | Closed |
Google categories: Excavating contractor
View on Google Maps →Last checked October 4, 2026.
More from Google Business Profile
Listed features
- Accessibility
- Wheelchair accessible parking lot
Photos on Google: 2
From Google Business Profile, last checked October 4, 2026.
Iowa Contractor Registration
- Reg. #
- C086262
- Expires
- September 27, 2027
Source: Iowa Division of Labor contractor registration data, licensed under CC BY 4.0. Look up this registration
About excavation contractors in Onawa
Excavating contractors handle digging, grading, trenching and site preparation. Excavators dig foundations and basements, grade lots for drainage, trench for utilities and drain tile, install culverts, remove stumps and prepare sites for driveways and building pads.
Typical cost: $2,000–$15,000 for residential site work. See the full cost guide
Typical U.S. ranges from industry sources (2024–25); not EdgeLocal data. Your quote will vary with scope, materials and location.
Questions to ask this contractor
- Confirm utility locates: Contractors must call 811 before digging.
- Ask about drainage planning: Grading should move water away from structures.
- Clarify hauling: Confirm where excess soil goes.