Compare quotes with the same checklist
This is a planning checklist, not a list of charges that apply to every property. Have the appropriate provider confirm each item, its cost and its responsible party.
| Budget area | Ask the provider |
|---|---|
| Unit and finishes | Which model, dimensions, fixtures and finish selections are included? |
| Design and permits | Who prepares and submits the property-specific plans? Which fees are estimates? |
| Site and foundation | What survey, grading, foundation or other site work is included or excluded? |
| Delivery and installation | Are transport, access planning, lifting equipment and installation in the scope? |
| Utilities and completion | Who prices connections, inspections and any required finishing work? |
| Funding and reserves | What financing costs, payment timing and contingency allowance should be planned? |
Three useful documents to request
- An itemized quote identifying estimates, exclusions and allowances.
- A responsibility list naming the provider for each project stage.
- A payment schedule showing deposits, milestones and change-order handling.
Does prefab mean the ADU is already approved?
Do not assume a model’s availability resolves your property’s requirements. Ask the provider and the local planning or building department which approvals and site-specific documents are needed. The HCD handbook is a starting point for California’s ADU framework; local review remains important.
Planning for family or rental use
Describe the intended use before selecting a layout. For family, consider access, privacy and daily living needs. For a potential rental, investigate operating expenses, applicable requirements and realistic local demand. Rental income, occupancy and investment returns are not guaranteed.
Where ADU Fund Co fits
We begin with your inquiry and help you explore financing and prefab ADU options. We do not perform permitting or installation. Ask the relevant provider to confirm its exact scope in writing. Our website designs are illustrations, not a model specification or a construction quote.
Sources & scope
Sources checked October 10, 2026. General educational information, not an individual financing recommendation. Loan terms and approval are determined by the lender. ADU Fund Co helps with initial inquiries and next steps.