Free tools

Free ADU calculators.
Run the numbers before you talk to anyone.

Every Avorino tool in one place: price a build, model the rent, size the loan, check your city’s permit reality.

Not sure which ADU calculator you need? The cost calculator answers what a build costs, the ROI calculator what it earns back, the loan calculator what the monthly payment looks like, and the garage conversion calculator prices a conversion rather than a new build.

The toolbox

Seven ways to find your number.

Four calculators that price a build, model the rent and size the loan, a property check that reads your own parcel, and two references that tell you what your city will actually ask for.

Calculator01 / 07

ADU Cost Calculator

$85K – $440K+All ADU types · typical OC range

Get an instant, detailed cost breakdown based on your property location, ADU size, and finish level. Powered by real Orange County market data.

Calculate Your Cost

Calculator02 / 07

ADU ROI Calculator

6.4 yrsPayback · 800 sqft detached · Irvine

See your projected rental income, property value increase, and payback timeline. Make confident investment decisions with real numbers.

See Your ROI

Calculator03 / 07

Garage Conversion Cost Calculator

$85K – $170K+Turnkey · permitted conversion

Price a garage conversion on your own garage: square footage, finish level, and what the permit and utility work really adds.

Price My Conversion

Calculator04 / 07

ADU Loan Calculator

4 routesHELOC · cash-out · construction · renovation

Work out the monthly payment, total interest, and what an ADU build costs to finance across the terms lenders actually offer.

Run The Numbers

Property check05 / 07

ADU Eligibility Check

800 sq ftState floor · detached ADU, every OC city

Enter an Orange County address and see what state ADU law allows on that parcel: lot size, terrain, hazard overlays, sewer or septic, HOA and overlay zoning, each field with its source.

Check Your Address

Reference06 / 07