Key Facts Ordinance Text Full Breakdown Violations FAQ Sources

Post Falls, ID Accessory Structures: ADU Rules (2026)

Some Restrictions

Researched & edited by Martyn O'NeillHow we verify

ADU rules in Post Falls, ID — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.

Verified yesterday

Recently verified

Key Facts

Units allowed: One ALU per parcel
Size cap: 1,000 sq ft or 50% of primary
Common wall: Not permitted
Permit: Accessory living unit permit required
Setbacks: Accessory-building setbacks of the zone

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home — converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Idaho under recent ADU streamlining laws. The Post Falls, ID rules below cover local size, height, and setback requirements.

Kootenai County rule: Post Falls does not have its own ordinance for adu rules. The rule below comes from Kootenai County and applies to Post Falls.

Summary

Unincorporated Kootenai County allows one accessory living unit per parcel with an accessory living unit permit from the Director. It cannot share a common wall with the main home and is capped at 1,000 sq ft or 50% of the primary home's habitable space.

Full Breakdown

Under Kootenai County Land Use and Development Code 8.4.301, an accessory living unit is a secondary dwelling with independent living, cooking, sanitation, and sleeping facilities on the same parcel as the principal dwelling. It cannot share a common wall with the primary home. Size is capped at 1,000 sq ft of habitable space or 50% of the primary structure's habitable space, whichever is greater. Only one ALU is allowed per parcel, and it must meet the accessory-building setbacks of the underlying zone. An ALU permit from the Director is required. Idaho cities (Coeur d'Alene, Post Falls, Hayden) set their own ADU rules.

Violations & Fines

Establishing an ALU without the required permit is a land-use code violation subject to enforcement under Chapter 8, Article 8.6 of the code.

Frequently Asked Questions

Can I share a wall between my ADU and house?

No. County code 8.4.301 states an accessory living unit cannot share a common wall with the principal dwelling unit.

How big can my ADU be?

Up to 1,000 sq ft of habitable space or 50% of the primary structure's habitable space, whichever is greater. Garage space with an 8-foot-wide door is excluded.

Sources & Official References

[1]Kootenai County Land Use and Development Code (Ord. 493, 8.4.301)

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Key Facts Ordinance Text Full Breakdown Violations FAQ Sources

Post Falls, ID Accessory Structures: ADU Rules (2026)

Some Restrictions

Researched & edited by Martyn O'NeillHow we verify

ADU rules in Post Falls, ID — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.

Verified yesterday

Recently verified

Key Facts

Units allowed: One ALU per parcel
Size cap: 1,000 sq ft or 50% of primary
Common wall: Not permitted
Permit: Accessory living unit permit required
Setbacks: Accessory-building setbacks of the zone

ADU Eligibility Quick-Check

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Idaho under recent ADU streamlining laws. The Post Falls, ID rules below cover local size, height, and setback requirements.

Kootenai County rule: Post Falls does not have its own ordinance for adu rules. The rule below comes from Kootenai County and applies to Post Falls.

Summary

Full Breakdown

Violations & Fines

Establishing an ALU without the required permit is a land-use code violation subject to enforcement under Chapter 8, Article 8.6 of the code.

Frequently Asked Questions

Can I share a wall between my ADU and house?

No. County code 8.4.301 states an accessory living unit cannot share a common wall with the principal dwelling unit.

How big can my ADU be?

Up to 1,000 sq ft of habitable space or 50% of the primary structure's habitable space, whichever is greater. Garage space with an 8-foot-wide door is excluded.

Sources & Official References

[1]Kootenai County Land Use and Development Code (Ord. 493, 8.4.301)

ADU Rules in Other Cities

Los Angeles, CA New York, NY Chicago, IL Houston, TX Phoenix, AZ San Francisco, CA

How does Post Falls compare?

See how Post Falls's adu rules rules stack up against other locations.

Compare to Another Location View Idaho Overview

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.

Post Falls, ID Accessory Structures: ADU Rules (2026)

Key Facts

Summary

Kootenai County LUDC 8.4.301

Full Breakdown

Violations & Fines

Frequently Asked Questions

Popular Rules in Post Falls, ID, ID

Sources & Official References

Related Post Falls Ordinances

Landscaping Rules: Composting

Landscaping Rules: Artificial Turf

Landscaping Rules: Native Plants

Landscaping Rules: Rainwater Harvesting

Landscaping Rules: Water Restrictions

Landscaping Rules: Weed Ordinances

ADU Rules in Other Cities

How does Post Falls compare?

Get notified when ADU Rules in Post Falls, ID changes

See something wrong?

Post Falls, ID Accessory Structures: ADU Rules (2026)

Key Facts

Summary

Kootenai County LUDC 8.4.301

Full Breakdown

Violations & Fines

Frequently Asked Questions

Popular Rules in Post Falls, ID, ID

Sources & Official References

Related Post Falls Ordinances

Landscaping Rules: Composting

Landscaping Rules: Artificial Turf

Landscaping Rules: Native Plants

Landscaping Rules: Rainwater Harvesting

Landscaping Rules: Water Restrictions

Landscaping Rules: Weed Ordinances

ADU Rules in Other Cities

How does Post Falls compare?

Get notified when ADU Rules in Post Falls, ID changes

See something wrong?