How much does it cost to wire a new addition in Calgary?

Wiring a new addition in Calgary typically costs between $3,000 and $10,000, with the price depending on the size of the addition, the number of circuits required, and whether your existing electrical panel can handle the additional load. A small single-room addition (bedroom or home office) sits at the lower end, while a larger multi-room addition with a kitchen or bathroom pushes costs higher due to the dedicated circuits and specialized wiring those rooms require.

For a basic bedroom or living space addition of 150 to 250 square feet, expect to budget $3,000 to $5,000 for the electrical component. This typically includes 3 to 5 new circuits (general outlets on 15-amp circuits, lighting on a dedicated circuit, and possibly a 20-amp circuit for a home office), smoke and CO detector connections tied to the home's existing interconnected system, exterior outlets with GFCI protection, and any outdoor lighting at entry points. The rough-in wiring is usually the most cost-effective part of a new addition since the framing is fully exposed — no fishing through finished walls.

A larger addition with a kitchen or bathroom significantly increases the electrical scope and cost. A kitchen alone requires a minimum of two dedicated 20-amp small appliance circuits, a dedicated refrigerator circuit, circuits for a range (40-50 amp), dishwasher, and microwave, plus GFCI-protected counter outlets. A bathroom needs GFCI outlets, a dedicated exhaust fan circuit, and possibly heated floor wiring. A multi-room addition with kitchen and bathroom wiring can run $6,000 to $10,000 or more for the electrical work alone.

The critical question your electrician will assess first is whether your existing panel has the capacity for the addition. If your home currently has a 100-amp panel — common in 1960s through 1980s Calgary homes in Brentwood, Varsity, Lake Bonavista, and similar communities — it almost certainly cannot support the additional load from a new addition. A panel upgrade to 200 amps adds $1,800 to $4,500 to the project, and this must be done before the addition circuits are connected. If your panel is already 200 amps with available breaker spaces, you may be able to accommodate the addition circuits without a panel upgrade, but your electrician will perform a load calculation to confirm.

For additions in Calgary, the electrical work follows a specific sequence that must coordinate with other trades. Rough-in electrical happens after framing and insulation but before drywall. Your electrician runs all wiring, installs boxes, and connects to the panel or a new sub-panel. A Safety Codes Officer inspects the rough-in before drywall is installed — this is a mandatory hold point. After drywall, mudding, and painting, the electrician returns for trim-out, installing all outlets, switches, light fixtures, and cover plates.

A sub-panel is often the most practical approach for larger additions. Rather than running individual circuits back to the main panel across the house, your electrician runs a single large feed (60 to 100 amps) to a sub-panel in or near the addition, then distributes circuits locally. A sub-panel costs $1,000 to $2,200 installed and simplifies both the wiring and future service.

Calgary's climate affects material choices for additions. Any exterior walls must have vapour barriers properly sealed around electrical boxes to prevent moisture intrusion, and outdoor outlets and fixtures need weather-rated enclosures that can withstand chinook cycling and UV exposure at Calgary's 1,045-metre elevation. Underground wiring to a detached addition must be buried below frost depth — exceeding 1.2 metres in the Calgary area.

An electrical permit is required for all addition wiring, and your general contractor or electrician typically handles the application through the City of Calgary. Budget $150 to $350 for permit fees. Calgary Electrical Services can connect you with licensed electricians experienced in addition wiring for free estimates.