Do You Need a Permit to Build a Garage in Indiana?

The Short Answer: Yes, You Almost Certainly Need a Permit

In nearly every Indiana jurisdiction, building a garage requires a building permit — whether it’s attached to your home or a detached structure. This applies to new construction, not minor repairs to an existing garage.

The specifics — fees, required documents, size thresholds, and review timelines — vary significantly across Indiana’s 92 counties. Here’s what you need to know.

Attached vs. Detached Garages

Attached Garages

An attached garage connects to your home and shares at least one wall. Because it’s structurally tied to the house, an attached garage always requires a building permit. The permit process is similar to a home addition:

• Full construction drawings showing the connection to the existing structure
• Site plan with setback distances from property lines
• Foundation and footing details
• Electrical plans (if the garage will be wired)
• Fire separation details (attached garages require fire-rated separation from living space per Indiana code)

In Knox, Indiana, attached garages incur an additional $50 fee on top of the standard building permit cost.

Detached Garages

A detached garage is a standalone structure on your property. Most Indiana jurisdictions require a permit for detached garages, but some have size exemptions for very small structures.

Common size thresholds where permits are NOT required:

• Some counties exempt structures under 144 square feet (12x12)
• Others set the threshold at 200 square feet
• A few jurisdictions have no exemption — all structures need a permit

Important: Even if your detached garage falls under the permit-exempt size threshold, you may still need to comply with zoning setback requirements. Check with your local planning department before you start building.

What a Garage Permit Typically Costs

Garage permit fees in Indiana vary widely:

Jurisdiction	Fee Structure
City of Seymour	$75 flat fee for garages
Floyd County	$40-$100 or $0.15/sq ft for residential structures
Evansville / Vanderburgh County	$0.06/sq ft (minimum $100)
Parke County	$50 flat fee for residential
Ripley County	$115 + $0.10/sq ft
Union County	$150 + $0.07/sq ft
Washington County	$50-$500 based on square footage

Many jurisdictions — including Indianapolis, Fort Wayne, and Bloomington — base fees on the construction valuation rather than a flat rate. Call your local permit office for an exact quote.

Required Documents

While requirements vary, most Indiana jurisdictions want:

1. Building permit application — Available at your local building department or online (if your jurisdiction has a portal)
2. Site plan / plot plan — Shows your property boundaries, existing structures, and the proposed garage location with distances to property lines
3. Construction drawings — Floor plan, elevations, and structural details. Self-drawn plans are accepted by many Indiana jurisdictions if they include the necessary information.
4. Foundation details — Footing depth must extend below the frost line (typically 36 inches in Indiana)
5. Electrical plan — If the garage will have electrical service

For larger or more complex garages, you may also need engineered truss drawings and drainage plans.

The Permit Process: Step by Step

1. Check zoning first — Before you design anything, verify that your lot allows an accessory structure and confirm the setback requirements. Some lots have deed restrictions or HOA rules that are separate from building codes.

2. Gather your documents — Prepare the site plan, construction drawings, and application form.

3. Submit your application — Online through your jurisdiction’s portal or in person at the building department.

4. Plan review — A plans examiner reviews your submission for code compliance. This typically takes 1-3 weeks for a garage.

5. Pay fees and pick up your permit — Once approved, pay the permit fee and post the permit at the construction site.

6. Schedule inspections — You’ll need inspections at key milestones:

   • Footing inspection — Before pouring concrete
   • Framing inspection — After the structure is framed (if applicable)
   • Final inspection — After all work is complete

7. Receive certificate of completion — After passing the final inspection, you’re done.

Special Considerations

Concrete Slab vs. Frost-Protected Foundation

Indiana’s frost line means garage footings must extend at least 36 inches deep. A simple concrete slab without proper footings won’t pass inspection. Frost-protected shallow foundations are an option in some jurisdictions — ask your building department.

Electrical and Plumbing

If your garage will have electricity, a separate electrical permit is usually required. If you’re adding a sink or bathroom, you’ll need a plumbing permit as well. In Evansville, electrical permits start at $30 and plumbing permits are $6 per fixture (minimum $30).

Zoning Setbacks

Garages must meet minimum setback distances from property lines. These vary by zoning district and jurisdiction. Common rear setbacks are 5-10 feet; side setbacks are typically 3-5 feet. Exceeding your lot coverage maximum is another common issue — verify the total allowable lot coverage with your local planning office.

Find Your Local Permit Office

Garage permit requirements vary across Indiana’s 92 counties. Find the specific requirements, fees, and contact information for your jurisdiction on our county and city directory.