ADU Requirements in Cascade Township, Grand Rapids, MI

What Homeowners Need to Know

Thinking about building an Accessory Dwelling Unit (ADU) or other accessory building in Cascade Township? Here's a quick guide to what’s allowed and what to watch out for:

🏡 How Many Accessory Buildings Are Allowed?

• Less than 3 acres: 1 accessory building (plus a garage)
• 3–6 acres: 2 accessory buildings (plus a garage)
• More than 6 acres: 3 accessory buildings (plus a garage)

📏 Size and Setback Rules

Setbacks and height affect what you can build:

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🚗 Garage Rules

• One garage per home is allowed by right.
• Detached garage: Up to 832 sq ft by right; more requires a Type I Special Use Permit.
• Attached garage: Base allowance is 832 sq ft for homes up to 1300 sq ft. You can add 1 sq ft of garage for every 5 sq ft over 1300.

🛑 Business Use Not Allowed

Accessory buildings can’t be used for business purposes.

🏘️ Design & Placement Requirements

• Buildings over 200 sq ft must match the style of the main house.
• No accessory building allowed without a main house already built (at least 50% complete).
• No building in front yards, unless on waterfront lots or allowed by special provision.
• Must leave at least 10 ft between the main house and any accessory building over 200 sq ft.

📝 Special Use Permit

If your building is:

• Over 832 sq ft, or
• Over 14 ft in height
  You may need a Type I Special Use Permit. This requires a full site plan and township approval.

✅ Summary

• You can likely build a small ADU (under 832 sq ft and 14 ft high) by right on most residential lots.
• Anything larger or taller requires a Special Use Permit.
• Style and placement must match zoning rules and your main home.

Need help designing your ADU or navigating permits in Cascade Township? Get in touch—we’re happy to help.