About this episode
Is a backyard ADU worth it? Michael Walliser takes a real lot in Durham, NC and works through it live with Reynolds McFarlane, Managing Broker at Carolina Land Experts, and Christopher Britt, Partner at Enduring Oaks Venture Partners and Chief People Officer at EasyDigz. Reynolds came into real estate through GIS and mapping and has put more than 240 properties under contract in the past three years. He walks through what he checks on every parcel: setbacks, stream buffers, floodplain and utility access. Christopher brings the investor's test: if an ADU doesn't at least pay for itself, it isn't worth building. Using GIS parcel maps, the Durham UDO and EasyInsights rental data, they show the questions to ask before you build an accessory dwelling unit, and where the numbers land.
What you’ll learn
- Why ADUs are coming up now, including North Carolina's new state ADU law
- How families use ADUs, from housing an aging parent to earning rental income
- How setbacks and stream buffers shrink the land you can actually build on
- Why sewer access, not septic, can make or break an ADU
- Durham's ADU size rules and what they allow on a single lot
- What an ADU costs to build, what it rents for in 27703, and whether one unit breaks even
Key numbers
- One ADU per lot in Durham, up to 1,200 sf total and 1,000 sf per story, and smaller than the main home
- $1,750 a month: the going rent for three rentals of 900 to 1,100 sf in 27703
- About $170K to $175K all-in: the build cost at which one ADU breaks even at that rent, assuming a 7% 30-year loan and about 35% for taxes, insurance, upkeep and vacancy
- About $8K to $22K: a typical upgrade to 400-amp electrical service
Common questions
What are Durham's ADU rules?
Durham allows one ADU per lot, and more units require a rezone. The size, parking and flood-zone rules are below.
How big can an ADU be in Durham?
Up to 1,000 sf per story and 1,200 sf total, and it must be smaller than the main home.
Do you need extra parking for an ADU in Durham?
No. Durham doesn't require added parking for an ADU.
Can you build an ADU in a flood zone in Durham?
No. Durham doesn't allow ADUs in flood hazard areas.
Can you build an ADU on septic?
It's difficult. A septic system is sized for the bedrooms of the existing house, so adding units usually means re-engineering it. On the Durham lot in this episode, sewer access was the deciding factor.
What is North Carolina's new ADU law?
A 2026 state law (SL 2026-59) requires cities of 50,000+ outside the coastal area to allow at least one ADU on single-family lots. Check your city's effective date.
Is building an ADU worth it?
It can be, if the build cost stays near $170K to $175K all-in. At $1,750 a month in rent, that's roughly break-even at today's rates. Owners with equity or lower build costs come out ahead.
Does an ADU add value to your property?
It can. When a city allows an ADU by right, the land can hold another home, which makes it more valuable. Reynolds and Christopher expect land values and tax assessments to rise as more cities allow ADUs.
Can ADU rent help you qualify for a mortgage?
In some cases. Fannie Mae now counts rent from one existing ADU on a 1-unit primary home, up to 30% of qualifying income. Construction loans for ADUs are still less standard.
What does a 400-amp electrical upgrade cost?
Typically about $8K to $22K. A backyard ADU can push an existing panel past its limit, so check power capacity early.
How do setbacks affect where you can build an ADU?
Setbacks are the required distances from the front, side and rear property lines, and they can take a lot of land off the table. On the Durham parcel in this episode, the Rural Residential setbacks are 50 ft front, 12 ft side and 25 ft rear.
Numbers in this episode are napkin estimates for discussion, not investment, legal or zoning advice.
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