Last researched: September 18, 2026. La Plata is one of the strongest Maryland municipalities to research separately because the Town has adopted Ordinance 26-20 — Accessory Dwelling Units in 2026. That means homeowners should use the Town’s municipal framework rather than automatically applying Charles County ADU rules.
Homeowner takeaway: Start with La Plata Planning before buying plans. Confirm the exact enacted Ordinance 26-20 standards for your parcel, then separately verify the Town permit, utility, occupancy and rental-license steps. A statewide “Maryland-compliant” plan does not establish that it fits a La Plata lot.
La Plata ADU planning snapshot
| Question | What we verified |
|---|---|
| Municipal ADU legislation? | Yes. La Plata’s official 2026 ordinance archive lists Ordinance 26-20 — Accessory Dwelling Units. |
| Who handles Town planning? | La Plata Planning administers planning, zoning, development review and permits. |
| Use & occupancy? | Town permit guidance expressly identifies ADUs among uses requiring a Certificate of Use and Occupancy. |
| Utilities / facility charges? | La Plata’s FY2027 fee schedule contains ADU-specific major-facility fee categories, including a distinction for ADUs of 700 sq ft or less. |
| Rental use? | La Plata operates a rental-license program with inspections; rental authorization is a separate check from ADU zoning/building approval. |
| Accessory-structure siting? | Town accessory-structure materials show rear-yard placement and 5-ft side/rear standards for ordinary accessory structures; confirm how enacted ADU rules interact with them before siting a detached unit. |
Ordinance 26-20 is enacted—not a pending proposal
Current status: La Plata Town Council adopted Ordinance 26-20 on September 8, 2026. The Town’s official 2026 ordinance archive now lists “Ord 26-20 Chapter 191 — Zoning Ordinance for the Town of La Plata, Maryland — Accessory Dwelling Units.” This matters because homeowners should use the enacted ordinance rather than the August hearing draft when the two differ.
The Town’s online municipal code notes that its electronic code is only current through January 2, 2026, so a search of the codified code can miss this later 2026 amendment. For the ADU rules, use Ordinance 26-20 and any later Town amendments until the online code is fully updated.
1. La Plata has its own 2026 ADU ordinance
The Town’s official ordinance archive identifies Ordinance 26-20 as the zoning amendment for Accessory Dwelling Units. This is important because La Plata is not merely a location inside Charles County for zoning purposes. An in-Town homeowner needs the municipal ordinance and Town approval process.
If your parcel is outside Town jurisdiction, use our Charles County ADU Rules guide. Confirm jurisdiction first.
2. Do not stop at “ADUs are allowed”
The useful homeowner question is not simply whether La Plata recognizes ADUs. You need the currently effective standards for your zoning district and project type: maximum floor area, attached/internal/detached treatment, setbacks, parking, owner occupancy if applicable, utilities and the approval sequence.
Ask Planning to identify the exact Ordinance 26-20 section controlling your parcel and to confirm any administrative interpretation adopted since enactment. That written confirmation is more valuable than designing from an older hearing draft or third-party summary.
3. La Plata’s permit process is a separate layer
La Plata Planning handles permits for new construction, additions and interior alterations as well as zoning/development review. Depending on the project, electrical, plumbing, mechanical and other approvals can also apply.
The Town’s permit FAQ expressly lists an Accessory Dwelling Unit among uses requiring a Certificate of Use and Occupancy. In practical terms, zoning eligibility is not the last step—you need the Town’s authorization before legally occupying the completed unit.
4. Detached ADU? Verify setbacks before ordering a prefab
La Plata’s accessory-structure application materials identify ordinary accessory structures as rear-yard structures and show 5-foot side and rear setbacks. Do not automatically assume those exact dimensions are the final detached-ADU setbacks under Ordinance 26-20. Ask Planning how the enacted ADU amendment interacts with the underlying district and accessory-structure provisions.
This is particularly important with prefab models: the manufacturer’s footprint, eaves, stairs, utility equipment and required clearances can make a nominally small unit fail the actual buildable envelope.
5. La Plata has ADU-specific facility-fee treatment
La Plata’s FY2027 fee schedule is unusually useful because it includes specific Accessory Dwelling Unit categories in its major-facility fees and distinguishes an ADU of 700 square feet or less from a larger ADU category.
That does not mean every homeowner can calculate the total project fee from one line item. Ask the Town which water, sewer, major-facility, permit, inspection and other charges apply to your specific project. But the existence of an ADU-specific fee category is a strong reason to get a municipal cost estimate before finalizing financing.
6. Water and sewer can affect the project economics
An ADU adds plumbing fixtures and another dwelling load. Before final design, ask whether the unit can use the existing service, whether a meter or service upgrade is required, and which major-facility or connection charges apply. Do not assume either “free shared connection” or “full second-house connection fee” without a Town determination.
7. Renting the ADU requires a separate licensing check
La Plata maintains a rental-license program covering rental dwellings and performs inspections. Therefore, an ADU being legal to construct does not automatically mean it is legal to rent without another Town step.
If rental income is central to your budget, ask about the current rental-license requirement, inspection cycle, fees and any occupancy restrictions before committing to the project.
8. Internal conversion vs. addition vs. detached unit
These three concepts can have very different cost and feasibility profiles. An internal conversion may avoid a new detached footprint but can trigger egress, fire separation, ceiling-height and utility work. An addition changes the principal structure. A detached ADU adds site-plan, accessory-structure and utility-routing questions.
Ask La Plata which Ordinance 26-20 provisions apply to the exact configuration before choosing a stock plan.
9. La Plata homeowner checklist before paying for plans
- Confirm the parcel is inside the Town of La Plata.
- Identify the zoning district.
- Ask Planning for the enacted Ordinance 26-20 standards controlling your parcel.
- Confirm maximum ADU floor area and measurement method.
- Confirm whether your internal, attached or detached concept is allowed.
- For detached units, obtain the exact setback, height and lot-coverage rules.
- Confirm parking requirements.
- Ask whether owner occupancy or rental limitations apply.
- Get a Town utility/facility-fee estimate.
- Map building, trade and Certificate of Use and Occupancy approvals.
- If renting, confirm rental-license and inspection requirements.
- Only then purchase plans or order a prefab unit.
La Plata MD ADU FAQs
Does La Plata have its own ADU ordinance?
Yes. The Town’s official 2026 ordinance archive lists Ordinance 26-20 — Accessory Dwelling Units.
Are La Plata ADU rules the same as Charles County?
No. For a parcel inside La Plata, start with the Town’s zoning and permit process. Charles County rules apply where County jurisdiction controls.
Do I need a Certificate of Use and Occupancy?
La Plata’s permit guidance expressly identifies Accessory Dwelling Units among uses requiring a Certificate of Use and Occupancy. Confirm the exact inspection and close-out steps for your project.
Can I build a detached backyard ADU?
Confirm the enacted Ordinance 26-20 treatment for your zoning district and then verify setbacks, lot coverage, height, utilities and other site constraints. Do not infer detached eligibility solely from ordinary accessory-structure rules.
Are detached ADU setbacks 5 feet?
The Town’s ordinary accessory-structure materials show 5-foot side and rear setbacks, but you should not automatically treat that as the final ADU rule. Ask Planning how Ordinance 26-20 interacts with those provisions for your parcel.
Does La Plata charge ADU-specific facility fees?
The FY2027 fee schedule contains ADU-specific major-facility fee categories and distinguishes units of 700 square feet or less. Ask the Town for the complete project-specific fee calculation.
Can the ADU share my existing water and sewer?
Do not assume either way. Ask La Plata whether existing service has sufficient capacity, whether upgrades or metering are required and what facility/connection fees apply.
Can I rent my La Plata ADU?
If the ADU and proposed rental are otherwise lawful, La Plata’s separate rental-license and inspection program may apply. Confirm rental authorization before relying on rental income.
Should I buy a prefab ADU before talking to the Town?
No. Confirm Ordinance 26-20 eligibility, size, setbacks, utilities, parking and fees first. A prefab advertised as Maryland compliant can still fail a specific La Plata parcel.
Primary sources checked
- Town of La Plata — 2026 Ordinances (Ordinance 26-20 ADUs)
- Town of La Plata — Planning
- Town of La Plata — Permit FAQs
- Town of La Plata — Current Fee Schedule
- Town of La Plata — Rental License
Maryland ADU Guide is an independent research publication, not the Town of La Plata, Charles County, a law firm, architect or contractor. Confirm the exact enacted Ordinance 26-20 provisions and parcel-specific requirements with the Town before spending money on design or construction.
What to do next
Start by finding the office that reviews your property. A mailing city or a county guide does not establish your parcel’s authority.
- Find Who Reviews My Property.
- Obtain your parcel identifier, survey, floor plans and utility records.
- Ask the reviewing office which current rules, supporting documents and approvals apply.
- Continue to your planning workspace.
Enable JavaScript to prepare a downloadable next-step brief. Planning guidance is not permit approval.