
Cost to build accessory dwelling unit in Idaho
Last updated: September 24, 2026
Idaho offers opportunities for ADU builds. Meridian is a growing area where ADUs are popular. The state's climate allows for a good building season. Accessory dwelling units add value and flexibility.
Choose your city
Idaho's climate is generally favorable for construction. Cold winters are manageable with proper planning. Spring, summer, and fall provide ample building time. This can lead to efficient project timelines. Many homes in Meridian and elsewhere are newer. We assess your property for its ADU potential. Local zoning and building codes are important. We help you understand these rules for your Meridian ADU. Choosing a builder with local experience is beneficial. We are familiar with Idaho's building environment.
Common questions
What is the cheapest way to build an ADU?
What does ADU stand for?
ADU stands for Accessory Dwelling Unit. It is a secondary, independent living space on a single-family lot. ADUs have their own kitchen, bathroom, and entrance. They provide flexible housing solutions.
Are ADUs allowed in Idaho?
Yes, ADUs are permitted in many Idaho cities, including Meridian. Local ordinances dictate size, placement, and other requirements. We can help you understand the specific rules for your property.
What is the most expensive part of building an ADU?
Foundation work and structural framing are usually the biggest expenses. Connecting to essential utilities like water, sewer, and electricity can also be costly. High-quality interior finishes add to the overall price.
How much does it cost to build an ADU?
The cost of building an ADU varies based on size, design, and materials. Site preparation and permit fees also influence the final price. We provide a free phone quote for your specific project in Idaho.
What about ADU permits in Idaho?
Permitting for ADUs in Idaho is handled at the local city or county level. Each jurisdiction has its own application process. We help you navigate these permit requirements for your Meridian ADU.
Useful reference: HUD ADU resources — ADU policy and financing research.