Sanford ADU Rules (2026)

Sanford is Seminole County’s county seat — a downtown built along the Lake Monroe waterfront that has been through several cycles of growth, decline, and deliberate revival. The revitalization that started in the mid-2000s took hold: the historic blocks along First Street and the marina district now draw residents and investment from across the region. For homeowners, that revival history matters because a significant portion of Sanford sits inside one of three National Register Historic Districts, and any accessory dwelling project in those areas requires a step that most of Central Florida does not: a Certificate of Appropriateness from the Historic Preservation Board.

One state-law clarification: Florida’s SB 48 ADU preemption bill did not become law. The bill passed the Senate and died in the House when the legislative session ended on March 13, 2026. The City of Sanford’s own Land Development Regulations govern your project.

How Sanford differs from unincorporated Seminole County

Properties inside Sanford city limits are governed by Sanford’s LDR — not by Seminole County’s land development code. The county code governs unincorporated Seminole County addresses (much of which was recently codified in a 2024 LDC overhaul). If your parcel is inside city limits, start with the city code, not the county page.

The most significant city-specific difference for most homeowners is the historic district layer.

Three historic districts — and what they mean for your project

Sanford has three residential and commercial areas listed on the National Register of Historic Places:

Downtown Commercial Historic District. The commercial core along First Street and the surrounding blocks between the waterfront and downtown grid. Most of these parcels are commercial, but some residential properties sit at the edges.

Sanford Residential Historic District. The primary residential historic district — a grid of pre-WWII homes east and northeast of downtown. Properties here include Craftsman bungalows, Victorian-era houses, and early 20th-century vernacular construction. This is the district most homeowners pursuing an ADU will be navigating.

Georgetown Historic District. A historically African American neighborhood immediately west of downtown, also listed on the National Register, with its own architectural character and preservation priorities.

If your property is in any of these districts, a Certificate of Appropriateness (COA) from the Historic Preservation Board is required before you can make any external modification — including painting, reroofing, adding a fence, building an addition, or constructing an accessory structure. The COA process evaluates architectural compatibility: height, massing, materials, and visibility from the street. It is not a discretionary veto on your right to build — the HPB evaluates conformance with adopted design guidelines, not neighbor opinion — but it adds a review step that is not present in non-historic areas.

HPB timeline: Applications are reviewed at monthly HPB meetings. Contact the Historic Preservation Officer at (407) 688-5140 to confirm the current submission schedule. For accessory dwelling projects in historic areas, a pre-application conversation with the HPO before commissioning plans is worth the call — you want to know the compatibility criteria before your architect finalizes massing and materials.

How to check your historic status: Call Planning at (407) 688-5140 with your address and ask whether your parcel is in one of the three historic districts. Alternatively, the city’s online zoning map shows district overlays.

What Sanford’s LDR says about accessory dwellings

Sanford’s Land Development Regulations address accessory structures and accessory dwelling units in Schedule E (Additional Requirements for Specific Uses) and Schedule B (Permitted Uses), with dimensional standards in Schedule F. The general framework permits accessory dwellings in single-family residential zones, with architectural compatibility with the primary residence required.

The specific standards you need to verify before designing:

The city’s LDR dimensional standards for accessory structures — setbacks, maximum height, maximum size relative to the primary dwelling — are set by zoning district and should be confirmed directly with Planning before commissioning drawings. The reason for this direction rather than a specific table: Sanford’s LDR schedules are updated by ordinance, and dimensional standards that were current at the time of research may have been amended. A five-minute call to Planning at (407) 688-5140 with your zoning district gets you current numbers and puts them in writing.

Specific questions to ask:

• What zoning district is my parcel in?
• Is an accessory dwelling unit a permitted use by right, or a conditional use requiring HPB or Commission approval?
• What are the current setback, height, and maximum size requirements for accessory structures in my district?
• Is my parcel in one of the three historic districts?

Submit permit applications through Sanford’s Citizenserve online portal.

The Lake Monroe waterfront and downtown adjacency

One practical dimension of Sanford’s geography worth noting: the neighborhoods immediately adjacent to downtown — along Magnolia Avenue, Oak Avenue, and the cross streets running toward Lake Monroe — are among the most sought-after parcels in Seminole County right now, and many of them sit inside the Sanford Residential Historic District. These tend to be Craftsman and Victorian-era homes on 60- to 75-foot lots with moderate rear-yard depth. The historic character adds appeal but also adds review. If the numbers work on a project in this area, the HPB step is manageable — plan for it.

Properties further east and south of downtown, in post-1950s residential areas outside the historic district boundaries, face standard LDR review without the HPB layer.

Permit process in Sanford

1. Pull your parcel from the Seminole County Property Appraiser and confirm the municipality field shows City of Sanford.
2. Call Planning at (407) 688-5140 with your parcel ID. Ask: your zoning district, whether ADUs are permitted by right or conditional use, current dimensional standards, and whether your parcel is in a historic district.
3. If in a historic district, contact the Historic Preservation Officer (same number) for a pre-application meeting before commissioning plans.
4. Commission a Florida-licensed architect or designer for site plan and construction drawings.
5. Submit through the Citizenserve Portal for building permit review.
6. Seminole County impact fees apply in addition to city permit fees. Confirm the current schedule with the Seminole County Impact Fee Coordinator before finalizing your budget.

Contacts:

• Planning and Historic Preservation: (407) 688-5140
• Address: 300 N Park Ave, Sanford, FL 32771
• Hours: Mon–Thu 7:00 am–5:30 pm; Fri 8:00 am–1:00 pm
• Permits: citizenserve.com/Sanford

What state law does not change

Florida Building Code applies to all new construction in Sanford. Chapter 489 governs contractor licensing — verify licensure through DBPR’s license lookup before signing. Chapter 713 governs construction liens and Notice to Owner procedures. The § 163.31771 affordable ADU pathway exists in state law; whether Sanford has adopted it is worth asking Planning directly.

See the Seminole County page for the surrounding county rules that apply outside city limits, and the zoning and lot check guide for the full parcel and setback verification process.