Electrical Planning for New Construction Homes in Missouri: What to Know Before You Build

Building a new home in Missouri is an exciting journey — but when it comes to the electrical system, there’s a lot more to consider than just where to put light switches. From panel sizing and outlet placement to future-proofing for solar, generators, and EV charging, proper electrical planning during new construction can save you thousands in upgrades later.

At Cain Electric, we work with homeowners and builders across Wildwood, Eureka, Washington, Union, and Pacific to design and install custom electrical systems that meet code, handle your lifestyle, and support future expansion.

Here’s what you need to know before construction begins.

1. Start With Your Lifestyle and Layout

Every family uses electricity differently. A one-size-fits-all panel setup won’t cut it if you:

• Work from home with dual offices
• Own electric vehicles or plan to buy one
• Use electric heat or have multiple HVAC zones
• Plan to finish the basement later
• Have outdoor living spaces that require power
• Want a hot tub, pool, or sauna

Tell your electrician about your lifestyle, not just your square footage. At Cain Electric, we create a custom load calculation based on how you live — not just how your house is framed.

See our Residential Electrical Services

2. Choose the Right Service Size From Day One

Most modern homes should have at least 200 amp service — even for modest square footage.

But we often recommend upgrading to 300 or 400 amps if you plan to add:

• An electric vehicle charger
• A whole-home generator
• A large solar array
• High-demand appliances or equipment

Upgrading your service after the house is built can be disruptive and expensive. It’s smarter and cheaper to do it during rough-in.

3. Plan Your Panel Locations Strategically

Your main service panel doesn’t always have to go in the garage. In fact, multiple panels might make more sense.

Consider:

• One main panel near the meter base
• A subpanel in the basement for finished spaces
• A garage subpanel for EV chargers, tools, or outdoor circuits
• A separate panel for generator or solar connections

This creates logical separation and easier access, especially for larger homes or multi-zone HVAC systems.

4. Get Smart With Switch and Outlet Placement

This is your chance to go beyond code minimums and design a home that works for you.

Ask yourself:

• Where do you charge phones or tablets?
• Will you mount TVs or hide cords?
• Do you need outlets in closets, built-ins, or pantries?
• Want to hide outlets behind nightstands or kitchen islands?
• Do you want a ceiling fan box prewired for each bedroom?

We recommend walking through your floor plan room by room and imagining how you'll live in the space. Cain Electric helps you identify gaps you may not catch on your own.

5. Rough-In for the Future

You might not want solar panels, a backup generator, or a hot tub right now — but if you think you might down the road, roughing in conduit or breaker space during construction saves massive time and cost.

We routinely prewire for:

• Backup generator connections
• EV chargers (even if the car comes later)
• Solar-ready subpanels
• Basement finishing
• Detached garages or workshops
• Low-voltage for cameras, speakers, or data

Planning for growth helps your new home evolve with you.

Explore our Backup Generator Services
Learn about Solar Prep and Installations

6. Lighting Layouts Matter — Inside and Out

Think beyond “one fixture in the center of the ceiling.”

We help you map out lighting for:

• Task areas (kitchen, garage, workshop)
• Ambient living spaces (dimmers, cans, pendants)
• Outdoor security and landscape lighting
• Holiday lighting plugs and soffit outlets
• Under-cabinet or toe-kick lighting
• Garage floodlights and driveway illumination

Good lighting makes your home feel complete — and it’s far easier to wire it now than after drywall goes up.

7. Don’t Forget Code Compliance

Missouri municipalities may adopt different editions of the National Electrical Code (NEC). Some key code areas for new builds include:

• AFCI/GFCI protection in living and wet areas
• Tamper-resistant outlets for child safety
• Dedicated circuits for major appliances
• Load calculations for service sizing
• Smoke and CO detector wiring
• Labeling and grounding

Cain Electric handles all permitting and ensures your rough-in and final inspection pass without surprises.

8. Smart Home? Wire for It Now

Even if you aren’t ready to automate your home today, you can rough in the wiring now for:

• Smart switches and dimmers
• Video doorbells and security cameras
• Audio systems and surround sound
• Structured data and Cat6 drops
• Control panels or smart hubs

We’ll future-proof your home so you can upgrade whenever you want — without tearing up drywall later.

9. Coordinate with Your Builder Early

Many general contractors use their preferred electrician by default — but if you have specific electrical needs, you can usually request to bring in your own licensed team.

Cain Electric works directly with homeowners and builders throughout the greater Franklin County area. We coordinate with framers, HVAC installers, plumbers, and inspectors to make sure your electrical system integrates cleanly and doesn’t hold up progress.

10. Work With a Team That Sees the Bigger Picture

At Cain Electric, we don’t just run wire — we plan, optimize, and build with intention.

We provide:

• Custom load calculations
• Smart panel and subpanel design
• Full-home and future-ready outlet layouts
• Generator and EV charger prewiring
• Permit management and inspections
• Clean, code-compliant final installs

Whether you’re building a custom home or managing a subdivision, we’ll make sure your electrical system is safe, efficient, and ready for the future.

Build Smarter With Cain Electric

Don't wait until drywall to think about outlets. Electrical planning for new construction is one of the most overlooked — and most critical — parts of building your dream home.

Let Cain Electric help you get it right the first time. We serve homeowners and builders across Wildwood, Union, Pacific, Eureka, Washington, and the surrounding region.

Contact us today to schedule a new construction consultation.