The Massachusetts Clean Energy Center (MassCEC) has published an amazing ADU Wizard app that lets you look up your house and see an ADU on it.
Additionally, you can get an estimate on how much it would cost to finance building an ADU.
Check it out in full-screen here: goclean.masscec.com/adu-wizard/
Want to build an ADU?
Get Started – Building an ADU
Just, [click on] the amber Build me an ADU button above to learn more about building an ADU.