RESIDENTIAL

Duplex & Multifamily Plans in Florida

Design and permit drawings for duplexes, townhouses and small apartment buildings.

What the work involves

A small residential development needs to work at both the unit and site level. The design considers how people enter and use each home, how units are separated and how parking, services and outdoor space fit on the lot. Shared stairs or corridors are addressed where the design includes them.

The scope may include

Site plan with parking and unit count
Unit floor plans for each unit type
Demising wall and rated assembly details
Shared stair and corridor plans
Roof plan across the whole building
Elevations showing the unit rhythm
Building sections cut through the demising wall
Framing plan and foundation plan

The final documents and any separate engineering work are confirmed with the practice before work starts.

Start with the site and the unit brief

Provide the survey and explain the intended number, size and mix of homes. Access, parking, outdoor space and services need to work at the site level as well as within each unit. A feasibility review helps identify what needs investigation before the units are designed in detail.

Discuss how people reach their homes and whether stairs, corridors or shared amenities are proposed. These choices affect the arrangement and the coordination needed between units. A desired unit count is a starting brief, subject to the property’s applicable requirements.

Coordinate the repeated and shared parts

Repeating a unit plan can simplify the design, but the site, orientation and shared connections still need attention. Establish the proposed construction, unit separations and the service arrangements with the relevant designers.

For an existing building, share its approved use and available plans. Converting accommodation or adding units can create a different investigation and drawing scope from a new development.

Common project situations

Examples of where this service can help:

Side-by-side duplex on a corner lot
Fourplex with a shared stair
Townhouse row of four units
Small apartment building on an infill parcel
Live-work building with a unit above

Planning the scope

These points help define the work before drawings or reports are prepared.

Existing conditions to discuss

Narrow lot with a single curb cut
Parcel zoned for low density with a unit cap
Existing structure being converted to more units
Lot with a drainage easement across the rear
Site that slopes down toward the street

Coordination with other specialists

Structural framing and roof truss engineering
Fire separation and rated assemblies
Mechanical design for each unit
Electrical service and metering per unit
Plumbing with separate shutoffs per unit
Civil work for parking and drainage
Surveyor for the lot and the setbacks

Issues that may affect review

A unit count above what the zoning allows
Parking below the minimum for the unit mix
Separation between units not shown as a rated assembly
Shared egress that exceeds the allowed travel distance
Fire sprinkler thresholds crossed by the unit count or the building height
Impervious area above the lot coverage limit

Work to discuss separately

Commercial and mixed-use tenant space
Structural design of the building frame
Civil engineering for utility mains
General contracting services
Property management and leasing

FLORIDA PERMIT DATA

What the permit records show

Data through August 2026

Matching permits: 3,099
Median declared job value: $420,000
Middle 50% of declared values: $75k–$2.2M
Permits with a declared value: 2,922

"multifamily" appears in 3,099 matching permits in the Florida records we analyzed. Declared job value is the value shown on the permit application, not a contract price, and it is based on 2,922 matching permits with a declared value.
How we count.

All multifamily data

How the work progresses

Typical steps are outlined below. The practice confirms the scope and who handles each stage.

Review the site and accommodation brief. Identify use, access, parking and service questions that affect feasibility.
Develop unit and site layouts together. Compare circulation, shared spaces and the proposed construction approach.
Coordinate the building and relevant specialist design. Resolve the relationships between units, shared areas and site infrastructure.
Prepare the agreed submission and construction information. Confirm review-response and later support responsibilities.

Questions about this service

Do I need an architect for a duplex?

Professional requirements depend on the proposed building and the exemptions that apply. Even where an architect is not required, the documents need to address the building and site requirements. Confirm the appropriate design team before preparing the application.

How many units can I build on my lot?

Check the parcel's land-use and zoning rules, then test the layout against parking, access, setbacks, drainage and utility constraints. A density allowance alone does not establish how many units will fit or be approved.

What fire separation is required between units?

Requirements depend on the building type, construction and arrangement of the units. Walls, floors, openings and service penetrations may all need specific details. The design team identifies the requirements for the proposed building.

Can a duplex be built on a single-family lot?

Only if the local rules allow the proposed duplex or an appropriate approval is obtained. An allowance for an ADU does not necessarily permit a duplex. Confirm the proposed building type and use with the local planning authority.

What happens after I send a request?

We pass your project details to a Florida architecture practice. Discuss the scope, fees and schedule directly with the practice before deciding to proceed.

Tell us about your project

Share the location and what you have in mind. A practice can review the scope and quote the work you need.

Request a quote See coverage

Prefer to talk it through? (321) 462-5592 or ask@floridaarch.com