Planning & Checklists
Deck Planning Guide
Updated 3 min read
The short answer
A deck plan answers four questions: how big, what material, what features, and where the utilities go. The size is determined by the yard, the room dimensions and the code clearances. The material is determined by budget and maintenance tolerance. The features (stairs, railing, pergola, lighting) are determined by how you use the space. The utilities (electrical, plumbing, gas) must be planned before construction begins.
The planning process
Work through these steps in order. Each one informs the next.
- Measure the yardMeasure the available space from the house to the property line, side to side, and the grade change from the house to the far edge. Note any obstacles: trees, utility metres, air conditioners, downspouts. These measurements determine the maximum deck size and shape.
- Set the purposeWhat will the deck be used for? Dining (needs 2.4m × 3.0m minimum for a table and chairs), lounging (flexible), entertaining (needs flow space), hot tub (needs structural engineering). The purpose determines the size, features and structural requirements.
- Choose the materialPressure-treated ($30–$50/sq ft), cedar ($45–$65/sq ft), composite ($50–$80/sq ft), or PVC ($60–$90/sq ft). The material determines the maintenance commitment, the appearance and the budget. Choose before the design so the design accommodates the material's requirements.
- Plan the featuresStairs (location, width, number of steps), railing (material, style, height), lighting (post cap, under-rail, stair), seating (built-in benches, overhang for stools), and any accessories (planters, privacy screens, pergola). Plan all features at once — retrofitting is expensive.
- Check the codeCalgary requires a building permit for decks attached to the house, taller than 600mm above grade, or larger than 108 sq ft. Unattached ground-level decks under 108 sq ft are typically exempt. Frost-depth footings (1.2m minimum) are required. Verify with Calgary Building Services.
- Plan utilitiesIf the deck will have electrical (lighting, outlets, hot tub), gas (fire pit, grill) or plumbing (outdoor sink), the rough-in must happen before the deck is built. Call Alberta One Call before digging any footings — utility lines may be present.
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Deck planning checklist
- Measure available yard space and grade change
- Define the primary purpose (dining, lounging, entertaining)
- Choose deck material (wood, composite, PVC)
- Determine deck size and shape
- Plan stair location and configuration
- Choose railing material and style
- Plan lighting (post cap, under-rail, stair)
- Plan electrical rough-in (outlets, hot tub circuit)
- Plan gas line if fire pit or built-in grill
- Check Calgary permit requirements
- Call Alberta One Call for utility locates
- Set budget with 15% contingency
- Select a contractor and get 3 quotes
- Order materials with lead time accounted for
Answers
Frequently asked questions
- What size deck should I build?
- The deck should be proportional to both the house and the yard. A good starting point: 200–400 sq ft for a small yard, 300–500 sq ft for a medium yard, 400–600+ sq ft for a large yard. The deck should feel like a room, not a platform — define the space with features, not just square footage.
- Do I need a structural engineer for my deck?
- For a standard ground-level or single-storey deck, a permit application with standard details is usually sufficient. For elevated decks (over 1.5m), decks supporting a hot tub, or decks with unusual spans, structural engineering is recommended and may be required by Calgary Building Services.
- How far in advance should I plan my deck?
- Start planning 2–3 months before you want to use it. The timeline: 2–4 weeks for design and material selection, 2–4 weeks for permit (if needed), 2–4 weeks for contractor scheduling, 3–10 days for construction, 1–2 weeks for finishing. Material lead times (especially composite) can add 2–6 weeks.
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