Why get an appraisal before adding ADUs to property
Getting an appraisal before adding ADUs (Accessory Dwelling Units) to your property can be a smart strategic move, especially if you’re thinking about financing, resale, or long-term return. Here’s why:
✅ 1. Establish a Baseline Value (Before & After Comparison)
- An appraisal provides your current property value before any improvements.
- This creates a clear benchmark to evaluate how much value the ADUs actually add after construction.
- Useful if you’re planning to refinance or sell the property down the road.
✅ 2. Inform Your Budget and ROI Analysis
- Understanding your property’s current value can help estimate the potential return on investment (ROI) from adding one or more ADUs.
- This helps you decide whether the cost of construction is justified by the projected value increase.
Whats an ADU?
An ADU is a secondary housing unit located on the same lot as a primary residence. It can take several forms, such as:
- Detached ADU: A standalone structure (like a backyard cottage or guesthouse).
- Attached ADU: Built onto the main home (e.g., an addition).
- Garage conversion: A garage turned into living space.
- Basement or attic conversion: Internal space reconfigured into an independent living unit.
🔍 Key Features:
- Typically smaller than the main house.
- Includes basic amenities: kitchen, bathroom, and sleeping space.
- Must meet local zoning and building codes.
Benefits of ADUs
- Additional Income: Rent out the ADU for passive income, helping offset mortgage or living costs.
- Multigenerational Living: Offers space for aging parents, adult children, or extended family, maintaining privacy and independence.
- Property Value Increase: Can raise the resale value of a home due to added living space and rental potential.
- Flexible Use: Use as a home office, guest house, studio, or short-term rental (where permitted).
- Affordable Housing: Helps address housing shortages by adding smaller, more affordable units to residential neighborhoods.
- Sustainable Development: Makes better use of existing infrastructure and land, potentially reducing urban sprawl
Junior ADU (JADU)
A JADU is a small, independent living space created within the walls of an existing single-family home. Think of it as a “mini-ADU.” In short, a JADU is a more affordable and space-efficient way to add housing compared to a full ADU.
🔍 Key Features:
- Size: Limited to 500 square feet maximum.
- Location: Usually converted from an existing bedroom, garage space, or attic inside the main house.
- Bathroom: Can either have its own or share with the main house.
- Entrance: Needs a separate entrance from the main home for privacy.
💡 Pro Tip:
If you’re planning to build both a JADU and a full-sized ADU on your property, build the JADU first. Many cities allow only one ADU and one JADU per lot. By locking in the JADU first, you preserve your ability to add the larger ADU later—maximizing your property’s potential and avoiding costly permitting setbacks. .
Why Build a JADU First?
Under AB 2406 (Gov. Code §65852.22), provids a unique option for Junior ADUs (JADUs) offer a simpler path for expanding housing:
- Streamlined approvals – Local agencies can’t require extra parking or water/sewer fees.
- Lower cost – JADUs are limited to 500 sq. ft. and often use existing space, reducing construction costs.
- Quick rental income – Easier to permit and build, allowing homeowners to start earning sooner while planning a larger ADU.
Please see additional details in the HUD Frequently Asked Questions for JADUs.
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