Home Additions

Black bank building icon with a columned entrance and roofline

Powering Your New Spaces Safely and Seamlessly

When expanding your home, it is a common mistake to simply run extension wires from the nearest room's outlets. Doing so often leads to overloaded circuits, flickering lights, and tripped breakers because older home systems were never designed to handle the electrical demands of modern space additions.



At Holtzclaw Electric, based in Marion, IL, we analyze your home’s existing electrical infrastructure before we run a single line of new wire. We perform load calculations to determine if your current panel can handle the expansion or if a dedicated subpanel is required. This guarantees your new addition will have consistent, safe, and independent power without putting a strain on the rest of your house.

A Code-Compliant Process for Absolute Peace of Mind

Adding power to a new wing of your home requires precise coordination. We make sure the integration goes perfectly by focusing on:

1. Load Calculations

 We carefully measure how much power your home currently uses to make sure the added square footage will not trigger system outages.

2. Dedicated Subpanel Installation

If your main breaker box is full, we install a clean, organized subpanel in your new space, giving you localized control over your breakers.

3. Advanced Arc-Fault & Ground-Fault Protection

We strictly follow the latest safety codes, installing AFCI breakers for bedroom additions and GFCI outlets for wet spaces (like wet bars, bathrooms, or patios) to protect against electrical fires and shocks.

4. Permitting & Inspections

We handle all municipal permits and work directly with local inspectors so your building project passes structural checks smoothly.

Comprehensive Electrical Wiring for Detached & Attached Spaces

Our experienced team handles the unique electrical demands of all types of residential additions and structural upgrades:



  • Attached Home Additions: Running brand-new circuits for home extensions, master bedroom suites, dining room expansions, and second-story build-outs.
  • Detached Garages & Workshops: Installing heavy-duty subpanels, dedicated 240V lines for power tools or welders, and heavy-load outlets.
  • Sunrooms & Covered Patios: Installing outdoor-rated GFCI protection, moisture-resistant wiring, and custom ceiling fans to maximize year-round comfort.
  • In-Law Suites & Accessory Dwelling Units (ADUs): Setting up completely independent sub-metering, small kitchen appliances, and bathroom exhaust layouts.
  • Finished Basements & Attics: Retrofitting wiring inside existing structures, adding recess lighting, and configuring smart entertainment outlets.
  • EV Charger & Hot Tub Pre-Wiring: Preparing your new outdoor spaces or garages for high-draw modern amenities with dedicated, safe circuits.

Let's Design Your Dream Home's Electrical Core Today

Don't leave the critical framework of your new home to general contractors or rushed subcontractors. Contact Southern Illinois' favorite local electrical experts to schedule your new build layout walkthrough.