Home addition costs in Calgary range from about $50,000 for a small bump-out to $500,000+ for a major addition — a single-room addition runs $80,000–$150,000 and a second storey $175,000–$350,000. Your fixed-price quote will vary based on your selections and square footage.
When You’ve Renovated Everything and Still Need More Space
Sometimes the smartest move is adding square footage rather than reorganizing what you have. Calgary’s housing market makes additions increasingly attractive compared to moving. Here’s the full cost guide.
Addition Types
Bump-Out (Small Addition)
Extends an existing room by 2–10 feet. Expands a kitchen, adds a breakfast nook, or grows a bedroom.
- Cost: $35,000–$80,000 (depends on size and structural complexity)
- Requires: foundation extension, roof tie-in, exterior finishing
- Timeline: 8–14 weeks
Rear Addition
Full-width addition to the back of the home, typically one storey. Most popular addition type in Calgary — adds kitchen, great room, or primary suite.
- Cost: $150,000–$400,000+ (depending on size)
- Price per sq ft: $300–$550/sq ft (all-in)
- Timeline: 16–26 weeks
Second-Storey Addition
Pop the top — add a full second floor to a bungalow. Huge square footage gain, major structural project.
- Cost: $250,000–$600,000+ (full second storey)
- Price per sq ft: $350–$600/sq ft
- Requires: structural engineering, temporary shoring, roof replacement
- Timeline: 20–40 weeks
Side Addition
Add to the side of the home. Common on corner lots or where side setbacks allow.
- Cost: $120,000–$300,000+
- Timeline: 14–24 weeks
Sunroom / Three-Season Room
Enclosed porch or sunroom. Less expensive because minimal HVAC and simpler structure.
- Cost: $40,000–$120,000
- Timeline: 8–14 weeks
What Drives Addition Cost in Calgary
| Factor | Cost Impact |
|---|---|
| Foundation type (slab vs crawl vs basement) | $15,000–$60,000 |
| Roof complexity (simple shed vs matching pitched) | $10,000–$40,000 |
| Plumbing in addition (bathroom, kitchen) | $15,000–$35,000 |
| Structural work (columns, beams, shoring) | $15,000–$50,000 |
| Exterior match (siding, stucco, brick) | $8,000–$30,000 |
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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.
Permit Requirements
All additions require building permits in Calgary. Large additions or those affecting the home’s structure require a structural engineer’s stamp. Development permits may also be required depending on lot coverage and zoning rules. Budget 8–16 weeks for permit approval before starting.
Addition vs. New Build: The Math
In many Calgary communities, a well-done addition costs $350–$500/sq ft. A new build is $450–$700/sq ft for a similar spec. For adding 500–1,000 sq ft, an addition usually makes more financial sense — especially if you love your neighbourhood and lot.
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Contact Olympic City Renovations to schedule a Discovery Call.
Olympic City Renovations serves Calgary, Priddis, Okotoks, and surrounding communities.
Frequently asked questions
A small bump-out addition is typically $50,000–$100,000.
A second-storey addition in Calgary usually runs $175,000–$350,000.
A bump-out adds space to one room affordably; a second storey adds the most space but costs more and needs structural work. We can walk you through both.
Yes — additions require a permit and usually engineering, which we handle as part of the build.
Related reading: Calgary renovation cost guide, home addition pricing breakdown, and how to choose a renovation contractor