New Construction Electrical Planning Guide for Sarasota Coastal Homes | CoHarbor Electric

Building a new home on or near the water in Sarasota is a different project than building inland. Not just in the obvious ways — the views, the lot costs, the elevation requirements — but in the details that don’t always get talked about until something goes wrong. The electrical systems in a coastal home are working against conditions that inland homes don’t face at the same level. Salt air, humidity that never fully leaves, storm exposure, the kind of corrosion that can quietly work on connections and equipment for years before anyone notices.

We’ve wired new construction homes on Siesta Key, Bird Key, Lido Key, Casey Key, and along the waterfront corridors in Sarasota and Venice. The principles are the same as any residential new construction — load planning, panel sizing, code compliance, coordination with the other trades. But the execution looks different when salt air is part of the environment, and the decisions made during construction determine how well those systems hold up over the life of the home.

Here’s what goes into planning electrical systems for a new coastal home in Sarasota, from the first conversations through final inspection.

Start With Load Planning — Everything Else Follows

The biggest mistake on any new construction project is treating the electrical scope as something you figure out during rough-in. By the time rough-in starts, the decisions that matter most should already be made. Panel size, service voltage, feeder layouts, subpanel locations — those are design-phase conversations, not construction-phase ones.

Load planning means building a complete picture of everything the home is going to run. Not just the obvious loads like the range and the HVAC systems. The full list: EV chargers, a standby generator, pool and spa equipment, outdoor kitchen appliances, a home elevator if there’s one, a whole-home automation system, motorized hurricane shutters, a wine cellar refrigeration unit, a home theater system, a workshop or hobby space. Coastal homes in Sarasota often have all of this and more.

We build the load calculation from the ground up using the homeowner’s actual plans and appliance selections, not generic assumptions. The difference between a properly calculated load and a rule-of-thumb guess shows up in panel sizing — and a panel that’s sized too tight is a problem that’s expensive to fix after the house is built.

Service Size on a Coastal Custom Home

For a full custom home in Sarasota with serious outdoor living, multiple HVAC systems, and the kind of equipment load that comes with a higher-end build, 400-amp service is almost always the right starting point. Larger homes — especially those with a pool, a full outdoor kitchen, multiple EV chargers, a standby generator, and a home automation system — sometimes want a 400-amp main feeding a distribution panel with subpanels for specific areas.

The conversation about service size is worth having before the electrical drawings go to the engineer. A change from 200-amp to 400-amp service on a drawing is a line item. A service upgrade on a finished home is a project.

What Coastal Conditions Do to Electrical Systems

Salt air is corrosive in ways that aren’t always visible until real damage has been done. The closer the home is to open water — a Gulf-front property on Siesta Key or Casey Key, a bayfront home on the Sarasota Bay side, a canal-front home in Venice or Osprey — the more aggressively the environment works on electrical equipment.

We’ve opened panels on Gulf-front properties that were less than ten years old and found corrosion on the bus bars and terminals that looked more like forty-year-old equipment. The salt doesn’t give things a long lifespan when they’re exposed. And the corrosion isn’t just cosmetic — it increases resistance at connections, causes heat, and eventually causes failures. In a panel, that means nuisance tripping at best and real hazards at worst.

Panel and Equipment Placement

The first line of defense is placement. Main panels should be on interior walls where possible, away from direct salt air exposure. Where a panel has to be in a garage, the garage door orientation and prevailing wind patterns matter — a garage that faces the Gulf or the bay is a different exposure environment than one that faces inland.

Outdoor subpanels — for pool equipment, for a detached structure, for an outdoor kitchen — need NEMA 3R or NEMA 4 rated enclosures appropriate for coastal exposure. Standard residential-grade outdoor panels aren’t rated for what a true coastal environment delivers over time.

Hardware and Materials for Coastal Installations

Stainless steel fasteners throughout outdoor electrical installations — outlet covers, junction box screws, conduit straps. Corrosion-resistant weatherproof outlet covers rather than standard thermoplastic. Tinned copper wire in runs that pass through particularly exposed areas. Anti-oxidant compound on all aluminum conductor terminations.

None of this is exotic — it’s standard practice for a contractor who understands what coastal environments actually do. But it requires deliberate specification. The difference between equipment that lasts twenty years in a salt air environment and equipment that starts failing at eight is largely in those material choices.

Conduit Selection in Coastal Applications

Underground conduit for feeder runs, landscape lighting home runs, and pool wiring in coastal conditions should be schedule 40 PVC at minimum. Above-grade conduit on exterior surfaces in a true coastal environment — EMT, which is the standard metal conduit, corrodes significantly faster than it would inland. PVC conduit or liquid-tight flexible conduit with appropriate fittings holds up better where there’s direct salt air exposure.

This is something that varies by project and by exposure level. A home that’s two blocks from the beach faces different conditions than one that’s directly on the water. We evaluate exposure level on each project and specify materials accordingly.

Hurricane Shutters and Impact Windows: Electrical Coordination

Sarasota’s coastal homes are built to handle hurricane conditions, and the electrical systems need to be planned around that reality. Motorized hurricane shutters — roll-down or accordion systems — are common on higher-end coastal builds, and they have electrical requirements that need to be coordinated during construction.

Each shutter motor needs a circuit — typically a dedicated 120-volt circuit for individual motor operators, or a circuit feeding a group of motors through a central control unit. The control wiring, the motor wiring, and the switch or automation integration need to be planned alongside the shutter system design and roughed in before exterior finishes go up.

Impact windows and doors on a coastal Sarasota home don’t have electrical requirements themselves, but they affect how electrical penetrations through the building envelope are detailed. Every conduit penetration through an exterior wall on an impact-rated assembly needs to be sealed correctly to maintain the assembly’s rating. This is a coordination detail between the electrical rough-in and the building envelope, and it needs to be addressed during construction rather than at final inspection.

Generator Planning for Coastal Homes

This isn’t optional on a Sarasota coastal home — or at least it shouldn’t be. Hurricane season is real here, and power outages after a significant storm can run for days, sometimes longer depending on the extent of damage. A whole-home standby generator that starts automatically when utility power fails is the standard on serious coastal builds in this market.

The generator planning conversation involves several trades — electrical, mechanical (for the gas line), and sometimes the landscape architect if the generator location affects the site plan. From the electrical side, we’re sizing the automatic transfer switch, determining the feeder to the generator connection point, and making sure the load the generator needs to carry is within its rated output.

Generator sizing is a real calculation, not a guess. A 22kW unit that’s sized for a 2,000 square foot home isn’t sized for a 5,000 square foot home with two HVAC systems, a pool, and a whole-home automation system. We build the generator load calculation from the same base load data as the service calculation, scoped appropriately for what the homeowner wants to run during an outage.

Rough In for Future Generator Installation

For homeowners who want to plan for a generator but aren’t installing one at move-in, the right approach is to rough in the transfer switch location and the conduit pathways during construction. That means the generator can be added later without opening finished walls, without running conduit through completed landscaping, and without the coordination headaches that come with retrofitting into a finished home.

A transfer switch rough-in during construction costs a fraction of what it costs to add later. For a coastal home in Sarasota, it’s one of those items that almost always gets added eventually — planning for it during the build makes that eventually a lot easier.

Whole-Home Surge Protection

Lightning is a genuine hazard in Southwest Florida. Sarasota sees significant lightning activity during storm season, and the barrier islands and open waterfront areas can be particularly exposed. A direct strike or a near-strike can send a voltage surge through the utility lines that destroys electronics, appliances, and HVAC equipment that aren’t protected.

A whole-home surge protector at the main panel isn’t the same thing as the power strip with surge protection on your TV. Panel-level surge protection — a Type 1 or Type 2 surge protective device installed at the main service — clamps surges before they travel through the branch circuits. It protects the hardwired equipment throughout the house that no plug-in surge protector reaches.

On a coastal home with a whole-home automation system, quality HVAC equipment, an EV charger, and a pool automation system — the value of that equipment adds up fast. The cost of panel-level surge protection is modest by comparison. We install it on every new construction project we do. It’s not a line item homeowners push back on once they understand what it’s protecting.

EV Charging Infrastructure

Electric vehicles are common in Sarasota’s custom home market and becoming more so. Planning EV charging infrastructure during new construction is straightforward. Retrofitting it after the fact is more involved, and the cost difference is meaningful.

A Level 2 home charger — the kind that can fully charge most EVs overnight — needs a dedicated 240-volt circuit, typically 48 to 60 amps. For a two-car garage, planning for two charging circuits makes sense even if only one charger is being installed initially. The second circuit costs very little to rough in during construction and allows the homeowner to add a second charger without an electrician opening walls or pulling new wire through finished conduit.

On larger properties with detached garages or motor courts, the EV charging infrastructure needs feeder conduit run to the garage structure during site work, before hardscape is installed. Adding that feeder after the driveway and motor court are poured is a real job. Running the conduit sleeve during construction is not.

Smart Home Infrastructure for Coastal Builds

Whole-home automation — lighting control, motorized shading, climate, security, AV, pool and spa, gate and access control — is standard on Sarasota coastal custom homes at the higher end of the market. The electrical infrastructure to support it needs to be planned alongside the automation system design, not after it.

Lighting control systems like Lutron Homeworks require specific wiring approaches — each dimmer is a processor, home-run wiring to a central processor, phase-cut or forward-phase dimming depending on the load. That’s different from standard residential wiring and requires knowing what platform is being specified before the rough-in starts.

Motorized shading — interior roller shades, exterior solar shades on the lanai, drapery tracks — needs power at each shade location and control wiring back to the automation system. The wiring for motorized shades on a full coastal build can be substantial, and it needs to be coordinated between the electrical contractor and the shade system installer during rough-in.

Low-voltage infrastructure — network cabling, speaker wire, security camera runs, access control wiring — is typically a separate scope but requires coordination on conduit pathways, outlet box locations, and power circuits for equipment like access control panels and network switches. Getting that coordination right during rough-in makes the low-voltage installation cleaner and gives the homeowner a better end result.

Permitting and Inspections in Sarasota County

New construction electrical in Sarasota County requires permits through the county or municipality depending on the property location, and the inspection process covers rough-in, service, and final stages before a certificate of occupancy is issued. For barrier island properties — Siesta Key, Casey Key, portions of Venice Beach — jurisdiction can vary and needs to be confirmed early in the permit application process.

FPL coordination for the service entrance is part of the new construction process. The utility has specific requirements for meter installation, service entrance conductor sizing, and the point of delivery that need to be reflected in the electrical drawings. Getting those details right in the permit application avoids revision cycles that delay the plan review approval.

Sarasota County’s permitting volume has historically been significant, and the timeline from permit application to approval for a custom home depends heavily on how complete and correct the application package is. A well-prepared electrical permit package — accurate drawings, correct load calculations, engineer stamps where required — moves through review more cleanly than one that needs revision requests.

Work With Coharbor Electric From the Design Phase

The decisions that determine how well a coastal home’s electrical systems perform aren’t made at rough-in. They’re made during design — panel sizing, equipment placement, material specifications, coordination with the other systems in the house. That’s when the input matters most.

Coharbor Electric works on new construction custom homes across Sarasota, Siesta Key, Bird Key, Lido Key, Casey Key, Venice, Osprey, Nokomis, and throughout Southwest Florida. We understand what coastal environments require, we know Sarasota County’s permitting process, and we know how to deliver electrical systems that hold up and work well for the long run.

Call us or reach out through our website. If you’re in the design phase of a coastal custom home, that’s the right time to have this conversation.