Key takeaways
- Every project starts with an accurate survey. It shows your setbacks, existing footprint and room to build.
- Setbacks (front, side, rear) and maximum lot coverage (often around 50%) are set by each municipality and vary neighborhood to neighborhood.
- Detached ADUs have size caps that vary widely by town (e.g., Southwest Ranches: 1,200 sq ft on an acre or more, 600 sq ft under an acre; Davie: 400 sq ft detached), and a covered walkway usually does not count as "attached."
- In flood zones, new homes and substantially improved homes must be elevated. Stan's recent houses sit 2½ to 4½ feet higher than the homes they replaced.
- If improvements exceed 50% of your building's value, the whole house generally has to be brought up to current flood requirements. Know this before you buy or design.
- Even a six-inch encroachment into a setback can require a formal variance, with neighbor notification, a zoning board review and a city council hearing.
When someone calls Stan about a master suite addition, a room addition or a new home, his first question is always the same: "Can you send me a copy of your survey?" People ask why. The answer: before anyone talks about design, Stan needs to know whether there's even room on the site to build. And roughly half the time, the honest answer is no.
In Episode 2, Stan and architect Jeffrey Gross walk through the zoning issues that make or break residential projects in South Florida, from setbacks and lot coverage to ADUs, building height, FEMA flood elevations, fences, variances and short-term rentals.
Setbacks: the invisible lines around your house
Every residential lot has a front setback, side setbacks and a rear setback: the required distance from each property line to your building. Under Florida's home rule, each municipality sets these in its zoning code, and they're not the same in every city or even every neighborhood.
Jeff's tip: look down your street. You'll usually see one part of every house (a garage, a front bedroom) sitting at about the same distance from the street. That's the setback line. Houses come in L-shapes and H-shapes, but typically some part of the house is already built right to the setback. If yours is, you can't build past that imaginary line.
Pools and accessory structures often have their own, different setbacks. On one of Stan's projects, the pool could be as close as five feet from the property line to the water's edge, far closer than the house was allowed. That's exactly why the survey comes first: with it, Stan can pull your neighborhood's zoning requirements and see what room you actually have.
Maximum lot coverage (often about 50%)
Even if setbacks allow a big addition, lot coverage may not. For many South Florida properties, buildings can cover no more than about 50% of the lot. The rest must remain pervious area (landscaping, lawn and other surfaces that let rain soak in), and it has to accommodate things like the driveway.
"If you had your lot completely covered with house and driveway and sidewalk and swimming pool deck, the rain would have no place to go."Jeffrey Gross, Episode 2
Stormwater retention: keep your rain on your lot
When Stan designs a new house, the drawings must show where rainwater will be stored on the site. You're not allowed to drain onto your neighbor's property, and cities want the water that falls on your lot to stay on your lot rather than running into streets, canals and lakes. When a house is maxed out on both setbacks and coverage, there's very little green space left, and a civil engineer may need to design other solutions, such as underground exfiltration or retention systems.
ADUs (accessory dwelling units): size limits vary by town
For the last five years, one of the most common calls Stan gets is about ADUs: a separate unit for aging parents, or for grown kids who want their own space on the family property. The rules for detached units differ dramatically from town to town:
| Municipality (Broward) | Detached accessory unit limit (as discussed in the episode) |
|---|---|
| Southwest Ranches | Up to 1,200 sq ft on lots of one acre or more; up to 600 sq ft on lots under an acre |
| Davie | Maximum of 400 sq ft for an unattached structure |
| Plantation | Roughly 400–600 sq ft range (verify current code) |
The covered-walkway myth. Many homeowners assume that connecting a new building to the house with a covered walkway makes it "attached," so the size cap doesn't apply. In Davie, Southwest Ranches, Plantation and many other municipalities, a covered walkway does not count as a connection to the existing house. And "they did it down the street" doesn't help, because that walkway may have been part of an older, originally permitted house. You have to meet the current code, and variance requests on this point usually get thrown out.
The rules are evolving. With housing costs rising, an aging population and many families wanting relatives close by, there's a real push to make ADUs larger and easier to permit. Miami-Dade has been working on ADU-friendly zoning changes, and Stan expects more changes across Broward municipalities in the next few years.
Building height and the 22-foot step-back
Ever notice a two-story house in Broward with a third floor stepped back in the middle? That's zoning. Side setbacks in many neighborhoods are 5, 7½ or 10 feet or more, and many city codes say that above 22 feet, you must step the building in one foot for every additional foot of height, typically up to a maximum height around 35 feet. The goal: no three-story wall rising straight up next to a one-story neighbor, the so-called "McMansion" effect when an older house is torn down and replaced with something much larger.
FEMA flood zones: why new houses sit so much higher
Flood rules are pushing South Florida homes upward. Older neighborhoods are now being required to build the first floor higher than existing homes, which also raises the overall height of the house before you've added a single story.
Stan's last three houses were each built 2½ to 4½ feet higher than the houses they replaced, because all three sat in floodplains. One Fort Lauderdale example:
- The existing 1950s house's floor was at about 5½ feet elevation.
- The FEMA flood elevation at the time was 7 feet (it has since been raised to 8 feet).
- The city required the finished floor to be at least 8.4 feet, so Stan built it at 8½ feet.
The result: standing on the ground floor of the new house, you're looking at the roof of the low-slung 1950s house next door. Over time, Stan expects most houses along streets like that to be rebuilt higher.
Jeff adds that because the federal government provides much of the nation's flood insurance, it sets these elevation requirements, and they keep changing with experience. One newer concept is freeboard, which means building above the base flood level to account for waves driven by wind or boats during a flood.
The 50% rule: a costly surprise for buyers and renovators
Here's the rule that trips people up most. Look up your property on the county property appraiser's website and you'll see the value split into land and building. As Stan explains it: if the building value is $500,000 and you put more than $250,000 into it, you generally have to bring the whole house up to current FEMA flood requirements. For a house sitting below the flood elevation, that can mean elevating it or tearing it down. (Your building department makes the final determination of what counts toward the 50%.)
Stan shared the story of a homeowner near the Fort Lauderdale police headquarters, on a canal, whose house sat around 5 feet elevation in a 7-foot flood zone. He'd hired someone who presented herself as an architect but wasn't, and who had another architect sign and seal her drawings, which is illegal in Florida unless the architect directly supervised the work. Nobody told the owner his addition would have to be at about 8.4 feet, or that a large enough project would trigger the 50% rule. He was stuck with a house he could either knock down and rebuild, or leave as it was.
"It's important that you get the right people that can tell you the right answers when you propose doing something."Jeffrey Gross, Episode 2
Stan has heard that same story at least half a dozen times. Before you buy, or before you design, find out your flood zone, your current floor elevation and your building value.
Fences: get a surveyor before the fence company
Stan can't count how many times he's found a fence sitting on the neighbor's property. Have a surveyor stake your property lines before the fence goes in. It's far cheaper than moving a fence (or settling a dispute) later.
Variances and non-conforming houses
Zoning changes over time. One of Stan's clients nearby wanted a large addition, but the required setback had changed from about 30 feet to 35 feet since the house was built, leaving the existing house six inches inside the setback line. Even for six inches, they had to go through an administrative variance with the Town of Davie.
A variance is not a standard building permit. It's a separate process that typically includes:
- A drawing package: site plan, elevations and an accurate survey
- Letters or signatures from neighbors
- Mailed notices to property owners within a set radius (500 feet on Stan's recent projects)
- Review by a zoning board, which makes a recommendation
- A presentation and hearing before the city or town council
Neighbors within the notice area have the right to attend and speak for or against you. As Jeff notes, they usually only show up if they oppose. On one small variance converting a two-car garage into an art studio, a neighbor flatly refused to sign; he never showed up to the hearings, and the variance was approved because it was minor and enhanced the property.
Short-term rentals
Airbnb-style short-term rentals are an increasingly hot topic at city council meetings. Jeff lives three houses from one: some renters are considerate, others throw late-night parties with loud music and heavy traffic. Expect continued debate, and possibly new local rules, around short-term rentals in residential neighborhoods.
Stan's bottom line
Where do you really start? With an accurate survey, and with an architect who knows the local zoning code, the flood rules and the variance process. Those two things will tell you what's possible before you spend money on a design you can't build.
Frequently asked questions
Why does an architect ask for my survey first?
The survey shows your property lines, the existing house and its distances to each line. With it, an architect can check your municipality's setbacks and lot coverage limits to see whether there is room to build before any design work starts. Stan finds that about half of callers don't have room for what they want.
What is maximum lot coverage?
Lot coverage is the percentage of your lot that buildings may cover. For many South Florida residential lots it is around 50%, so enough pervious area remains for drainage and landscaping. Each municipality sets its own limit and definition.
Does a covered walkway make an ADU "attached" to my house?
Usually not. Many Broward municipalities, including Davie, Southwest Ranches and Plantation, do not count a covered walkway as a connection, so the detached-structure size limit still applies.
What is the 50% rule in a flood zone?
If the cost of improvements exceeds 50% of the building's value (the building value on the property appraiser's site, not including land), the building generally must be brought into compliance with current flood requirements, which can mean elevating the house. Your building department determines what counts.
Do I need a variance if my house already sits over the setback?
If you want to expand a house that is non-conforming because zoning changed after it was built, you may need a variance. Even a six-inch encroachment required an administrative variance on one of Stan's projects in Davie, including neighbor notices, a zoning board review and a council hearing.
This article summarizes a conversation on the HouseHelpPro Podcast and is general information, not legal, engineering or insurance advice for a specific property. Codes, zoning and flood maps change; confirm requirements with your local building and zoning departments or a licensed professional.