Thinking About Building an ADU in Lexington? Here's What the City Wants You to Know
Lexington has been quietly making it easier — and more rewarding — for homeowners to add a secondary unit to their property. Here's the full picture, plus a limited offer if you're ready to build in 2026.
What is an ADU, exactly?
An Accessory Dwelling Unit (ADU) is a smaller, self-contained home on the same lot as your primary residence. Think a converted garage, a finished basement with its own entrance, a backyard cottage, or an addition attached to the back of your house. They go by many names — granny flats, in-law suites, backyard bungalows — but in Lexington, they're officially called ADUs, and the city has been actively changing its rules to encourage more of them.
Why Lexington is leaning in
Lexington's long-range plan, Imagine Lexington 2045, specifically promotes ADUs as a tool for improving housing affordability and supporting aging residents who want to stay in their neighborhoods. AARP Kentucky has backed these efforts, and the city has steadily loosened restrictions since first allowing ADUs in 2021.
How the rules have evolved
The current rules at a glance
One ADU per lot. You can build one ADU on a single-family residential lot — no more.
Size cap of 800 sq ft for new builds or additions. Basement conversions are exempt as long as they stay within the home's existing footprint.
No owner-occupancy requirement for long-term rentals. You can rent both the main house and the ADU simultaneously.
Occupancy limit of 2 adults (plus children in their care) in the ADU.
Short-term rentals (Airbnb, VRBO) require a separate Conditional Use Permit from the Board of Adjustment.
Design guidelines apply for detached units — one entrance on the primary wall, exterior stairs on the side or rear.
Before submitting any permit application, you're required to attend a pre-application conference with Lexington’s Division of Planning. This free meeting helps you understand your specific lot’s requirements before investing in plans.
The financial case
Adding a legal ADU does two things at once: it creates a rentable asset generating monthly income, and it adds appraised value to your home. Because Lexington removed the owner-occupancy rule in 2023, you're no longer locked into living on the property to benefit — the ADU can be a straightforward real estate investment.
2026 is a strong year to act. The regulatory framework is settled, demand for rental housing in Lexington remains high, and contractors are more experienced with ADU builds than ever before. The question isn't really whether to build — it's when.
ADU design + construction. One flat starting fee. Let’s build your ADU this year.
For a limited number of homeowners in 2026, Oliver at OH Design Lab is offering a direct design-build path for ADUs — architectural design, pricing, and construction under one lead team.
Flat non-refundable deposit · applied in full toward your ADU construction contract
- You place a $2,000 non-refundable deposit to begin.
- OH Design Lab prepares concept drawings and a full price to build your ADU.
- If you proceed, the $2,000 is credited into the construction contract.
This offer applies to ADUs up to 800 square feet. Larger or more complex projects are quoted separately.
Ready to get started?
Whether you work with OH Design Lab or go your own route, your first step is the pre-application meeting with Lexington's Division of Planning — it's required before any permit can be filed, and it's the best way to understand what's possible on your specific lot. The city's official ADU resource page at lexingtonky.gov has the full ADU manual and permit guides.
Have questions about your property?
Ask about lot eligibility, what the build process looks like, or whether your address falls within the 60-mile service area.
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