Accessory dwelling units are one of the few home projects in South Florida where the rules, the budget, and the payoff have all moved in the homeowner’s favor at the same time. Florida law now requires municipalities to accommodate ADUs, Delray Beach lots in many neighborhoods have the room, and a finished unit adds both living space and rental potential. What trips most people up is not the construction. It is not knowing the sequence. This guide walks through how the process actually runs in Delray Beach, what it costs, and how long each phase takes.
Step One: Find Out What Your Lot Allows
Every ADU project starts with a feasibility check against the City of Delray Beach land development regulations. Before anyone draws anything, four questions get answered: what setbacks apply to a secondary structure on your lot, how large the unit can be, what parking is required, and whether your existing water, sewer, and electrical service can carry a second dwelling. A lot that fails one of these tests is not necessarily dead, but the fix (a utility upgrade, a smaller footprint, a different placement) needs to be known before design starts, not discovered in permit review.
Step Two: Design and Engineering
An ADU is a complete dwelling with a kitchen, bathroom, and sleeping area, so it gets designed like one. Architectural drawings, structural engineering, and mechanical, electrical, and plumbing plans are produced to the Florida Building Code, which in Palm Beach County includes wind-load design for hurricane zones. Design and engineering on a typical unit runs four to eight weeks. Working design-build, where the firm drawing the plans is the same one building them, matters here because the budget is being priced while the drawings develop rather than after they are finished.
Step Three: Permitting with the City
The full drawing set goes to the Delray Beach building department for review. Expect six to twelve weeks depending on department workload and how many revision comments come back. This is the phase homeowners can least control and the one where an experienced local contractor earns their fee quietly: clean, code-complete submittals generate fewer comment cycles, and each avoided cycle saves weeks.
Step Four: Construction and Inspections
Once the permit is issued, a detached ADU typically takes four to six months to build. The sequence is the same as any dwelling: foundation, framing and roof, then plumbing, electrical, and mechanical rough-ins, each verified by a city inspection before walls close, followed by insulation, drywall, finishes, and fixtures. Garage conversions run faster because the foundation and shell already exist. The project ends with final inspections and a certificate of occupancy, which is the document that makes the unit legal to occupy or rent.
What an ADU Costs in Delray Beach
Costs divide sharply by type. Converting existing space, such as a garage or a portion of the main house, generally lands between $60,000 and $130,000 depending on how much plumbing has to move. A detached new-build unit, with its own foundation, roof, utility connections, and impact-rated openings, typically runs $150,000 to $300,000 or more depending on size and finish level. The line items people forget to budget: utility connection fees, impact windows and doors, and site work like drainage and access paths. A design-build contract prices all of it before ground breaks.
Frequently Asked Questions
Can I rent out an ADU in Delray Beach?
Long-term rental of a permitted ADU is generally allowed; short-term rental rules are stricter and worth confirming with the city for your specific zoning district before you build around that assumption.
Do I need a separate address or meter?
Not necessarily. Many ADUs share the main house’s utility service if capacity allows. A separate meter is an option, not a requirement, and the feasibility review settles it.
How is this different from a home addition?
An addition extends your living space; an ADU is a self-contained second dwelling with its own kitchen and bath. The permitting path and the code requirements differ, which is why the two projects are priced and planned differently.
Thinking About an ADU on Your Property?
KMR Enterprises is a licensed and insured design-build general contractor in Delray Beach, FL. We handle the full ADU sequence under one contract: feasibility, design, city permitting, construction, and final certificate of occupancy. See our ADU building services, or contact us at (561) 288-5000 for a feasibility conversation about your lot.
Related: home addition vs. ADU and our residential construction services in Delray Beach. For Boca Raton lots, see ADU construction in Boca Raton.