How Much Does It Cost to Build an ADU?
Building an Accessory Dwelling Unit (ADU) can cost between $100,000 and $300,000. Costs depend on location, size, type, and materials.
What Are the Average Costs of building an ADU?
The cost to build an ADU varies. On average, it ranges from $100,000 to $300,000. This means you can expect to pay $100 to $300 per square foot. ## Are Attached ADUs Cheaper? Yes, attached ADUs cost between $106,000 and $216,000. The cost per square foot is about $204 to $492.
How Much Do Detached ADUs Cost?
Detached ADUs are more expensive. They range from $160,000 to $285,000. The cost per square foot is around $310 to $380. ## What Else Affects the Cost? Several factors can change the overall cost: -
ADU Permits: Can range from $450 to $14,000.
Utility Upgrades: May cost more if the current system can't handle the new load. -
Site Work: Prepping the site might be pricey due to obstacles like rocks. -
Interior Finishes: Using luxury materials will cost more.
Do Costs Vary by Location?
Yes, here are some examples: -
For example in San Diego county ADUs go for about $300/ sqft but this price might go up if the ADU is being built on a hill side or requires ample foundation work.
Does the Type of ADU Matter?
Yes, different types change the cost:
Prefab Modular: Costs range from $80 to $160 per square foot. These are usually cheaper. -
Above Garage: These can be the most expensive, costing $200 to $500 per square foot.
Are There Any Other Costs?
Other factors include:
Labor Rates: Higher in urban areas.
Site Conditions: Bad soil or steep inclines can increase costs. -
Permitting: Costs vary by location, from $60 to $75 plus $0.25 per square foot.
To start your ADU project, contact LifeHouseSD for a consultation or get a feasibility report. We'll help you understand the full costs, timeline, and steps needed to build your dream ADU.
