A home addition in Calgary typically costs $50,000–$350,000+ — from $50,000–$100,000 for a small bump-out to $175,000–$350,000 for a second-storey addition, and $250,000–$500,000+ for a major addition with a basement. Your fixed-price quote will vary based on your selections and square footage.
Home Addition Costs in Calgary for 2026
Running out of space but love your neighbourhood? A home addition expands your home without the stress of moving. Here’s what they cost in Calgary.
Types of Home Additions
1. Bumpout Addition
Small extension (100–300 sq ft) to expand an existing room — kitchen, dining, master bedroom.
Cost: $50,000 – $120,000
2. Single-Room Addition
New room added to main floor (bedroom, office, family room, etc.) — typically 150–400 sq ft.
Cost: $80,000 – $175,000
3. Second-Storey Addition
Adding a full second level to a bungalow or single-storey home.
Cost: $175,000 – $400,000+
4. Rear/Side Addition with Basement
Full two-storey addition with basement extension.
Cost: $250,000 – $500,000+
Per-Square-Foot Pricing
| Type | Cost/sq ft |
|---|---|
| Bumpout (heated space) | $400 – $600 |
| Main-floor addition | $350 – $550 |
| Second-storey addition | $400 – $650 |
| Basement addition | $200 – $350 |
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⚠ Estimate Disclaimer: These are only ROUGH estimates that can vary wildly. Do not take these numbers as gospel. Having a defined scope of work and exact selections will give you clarity.
What Drives Addition Costs
- Foundation work — new foundation or piling is 15–25% of cost
- Roof modifications — tying new roof into existing
- HVAC extension — may require new furnace or zone
- Electrical panel upgrade — often needed for larger additions
- Kitchen or bathroom — adds significant plumbing cost
- Finish level — materials and fixtures
Timeline
- Design and permits: 6–12 weeks
- Bumpout construction: 8–14 weeks
- Full main-floor addition: 12–20 weeks
- Second-storey addition: 16–26 weeks
Ready to Expand Your Home?
Contact Olympic City Renovations to schedule a Discovery Call.
Olympic City Renovations serves Calgary, Priddis, Okotoks, and surrounding communities. We specialize in kitchen renovations, bathroom renovations, basement developments, and luxury garage builds.
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Frequently asked questions
A bump-out runs $50,000–$100,000, a single-room addition $80,000–$150,000, a second storey $175,000–$350,000, and a major addition with a basement $250,000–$500,000+.
A second-storey addition is typically $175,000–$350,000, depending on size, structural work and finishes.
Often, yes — once you factor in realtor fees, land-transfer tax and moving costs, and you keep the home and neighbourhood you love.
Yes — additions require permits and usually structural engineering. We handle both as part of the project.
Related reading: Calgary renovation cost guide, home addition options, and how to choose a renovation contractor