Plan it, price it,
ask about it.
Free tools for working out whether an ADU or a build fits your lot and your budget. They use public maps and our published prices. Your lot and your town have the final say, so call when you want a real number.
Lot planner
See an ADU on your own lot
Enter your address to see your lot lines, soil and water layers, your town's rules, and a Langone model placed on the parcel. A sketch from public maps, not a survey or a permit.
Open lot plannerADU rules by town
What each town allows
Size limits, owner occupancy, parking and setbacks from each Maine and New Hampshire town's own zoning ordinance, with the section number and a link.
Open adu rules by townInstant pricing
A ballpark for your project
Answer a few questions about an ADU, a new home, an addition, a garage, a deck or a septic system and get a ballpark range.
Open instant pricingADU rental calculator
Rent, cash flow and payback
Pick a model and put in your own rent, costs and loan terms to see monthly cash flow, cash-on-cash return and how many years until the cash you put in comes back.
Open adu rental calculatorFAQ
The questions that come up first
Straight answers on ADU costs, town approval, septic, excavation and how the build runs.
Open faq