K

California ADU Cost & Loan Planner

Newly Added Calculators

California ADU Cost & Loan Planner

Build budget ≈ sq ft × $/sf × regional multiplier × (1 + soft-cost fraction). Loan payment is fixed-rate amortization; cash flow uses rent minus vacancy minus payment.

Add California ADU Cost & Loan Planner Free On Your Website

Paste this HTML on your site.

What is California ADU Cost & Loan Planner?

A planning tool that estimates the total construction cost of an Accessory Dwelling Unit (ADU) in California based on size, type, and location. It also calculates loan payments, interest, and overall financing needed to build the unit.

California ADU Cost & Loan Planner Formula / Method

TotalCost=Costpersqft×Size(sqft)+PermitFees+UtilityHookup+DesignFeesTotal Cost = Cost per sqft × Size (sqft) + Permit Fees + Utility Hookup + Design Fees
M=P×[r(1+r)n]/[(1+r)n−1]M = P × [r(1+r)^n] / [(1+r)^n−1]
r=AnnualRate/12r = Annual Rate / 12
TotalInterest=(M×n)−PTotal Interest = (M × n) − P
ROI=(AnnualRentalIncome/TotalADUCost)×100ROI = (Annual Rental Income / Total ADU Cost) × 100

California ADU Cost & Loan Planner Worked Example

Detached ADU, 600 sqft, Los Angeles:

Construction = 300 × 600 = $180,000
Permit Fees = $12,000
Utility Hookup = $8,000
Design Fees = $10,000
Total Cost = $210,000
Loan: P=$180,000, annual rate=7.5%, n=360
r=0.075/12=0.00625r = 0.075/12 = 0.00625
M = 180,000 × [0.00625×(1.00625)^360]/[(1.00625)^360−1] = $1,258.58/month
Total Interest = (1258.58×360) − 180,000 = $273,088

Rental income $2,200/month:

ROI=(26,400/210,000)×100=12.57ROI = (26,400/210,000)×100 = 12.57%

Where California ADU Cost & Loan Planner Is Applied

  • California homeowners planning to build backyard ADUs
  • Real estate investors calculating ADU rental yield
  • Mortgage brokers advising on ADU construction loans
  • City planners assessing housing density solutions
  • Architects and contractors providing client cost estimates

Related Newly Added Calculators

Explore similar calculators to streamline your workflow.

View all
3 Wire RTD Calculation4th Order Bandpass CalculatorScope 1–2–3 Emissions Sketch Calculator4–20 mA Signal & Scale Calculator8 Position DIP Switch Calculator
Calculator By Adil Balti, Content Proofread and Verify by Muhammad Kumail & Gulzar Abbas.

About Calculators.is

At Calculators.is our sole focus is to provide 100% accurate, fast, comprehensive, convenient, easy-to-use free online calculators to everyone to use without spending a single $ on any online Calculators.

All the calculators on our website are designed and developed by our own team, and each one is put through strict, comprehensive testing before being made live on our website.

About, Founder and calculator.is.