Design
Kitchen Island Planning Guide
Updated 3 min read
The short answer
A kitchen island works when three conditions are met: the room is large enough for proper clearances (900mm minimum on all working sides), the island serves a defined purpose (not just a surface), and the features are chosen before the cabinetry is built. The most common island failures are an island that is too large for the room, one with no clear purpose, and one where electrical, plumbing and storage were not planned before fabrication.
Island sizing by room dimensions
| Room size | Recommended island | Clearance | Notes |
|---|---|---|---|
| 3.6m × 3.0m (12×10 ft) | No island — use a peninsula | Cannot achieve 900mm all sides | A peninsula attached to a wall is the better layout |
| 3.9m × 3.6m (13×12 ft) | Small island: 1.2m × 0.6m | 900mm minimum on working sides | Limited features — prep surface and storage only |
| 4.2m × 3.6m (14×12 ft) | Medium island: 1.5m × 0.9m | 900–1000mm on working sides | Can accommodate a prep sink |
| 4.5m × 4.2m (15×14 ft) | Large island: 2.1m × 1.2m | 1000–1200mm on working sides | Full feature island with seating, sink, storage |
| 5.4m × 4.2m (18×14 ft) | Island with seating overhang: 2.4m × 1.2m+ | 1050–1200mm on all sides | Full working island with social zone |
Island features and what they require
- Prep sink
- Requires a plumber to rough in water supply and drain before the island is built. The drain must slope to the main stack. Electrical for a garbage disposal (if included) must be planned. The sink cut-out is made during fabrication — it must be finalised before the countertop is templated.
- Dishwasher
- Requires water supply, drain, and a dedicated electrical circuit. The dishwasher must be accessible from the sink side for plumbing connections. The cabinet layout must accommodate the dishwasher width (typically 600mm).
- Electrical outlets
- Required by code on at least one face of the island (or within 900mm of the countertop edge). The electrical must be roughed in before the island is built. Pop-up outlets or end-panel outlets are the most common solutions.
- Seating overhang
- A 300–450mm overhang on one side of the island creates a breakfast bar. The countertop must be supported — either by the cabinet structure extending under the overhang, by corbels, or by a waterfall edge. An unsupported overhang over 300mm will sag or crack.
- Storage
- Drawers on the working side (facing the perimeter cabinets) are the most efficient storage. Deep drawers for pots, shallow drawers for utensils. Doors with shelves are less efficient but cheaper. The side facing the dining area can be finished panels or open shelving.
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The clearance rules
- 900mm minimum
- Between the island and any opposing cabinet, wall or appliance. This is the code minimum and the practical minimum for one cook to work comfortably. A dishwasher or oven door open into this space, so 900mm is the absolute floor.
- 1050–1200mm for two cooks
- If two people will work in the kitchen simultaneously, the clearance between the island and the perimeter must accommodate two people passing with appliance doors open. This is the most common clearance undersize in Calgary kitchens.
- Traffic flow
- If the kitchen is on a through-route (hallway to living room, front door to back door), the island must not create a bottleneck. A 1200mm clearance on the traffic side keeps the flow comfortable. A 900mm clearance on a traffic route feels congested.
Answers
Frequently asked questions
- Can I add an island to an existing kitchen?
- It depends on the room size and whether utilities can be extended. The room must have at least 3.9m in one direction and 3.6m in the other to fit a small island with proper clearances. If the island needs plumbing or electrical, those must be extended from the perimeter — which involves floor or ceiling work.
- How much does a kitchen island cost in Calgary?
- A small island (storage and prep surface only) runs $3,000–$6,000. A mid-range island with a prep sink and seating runs $6,000–$12,000. A large island with a sink, dishwasher, electrical, seating and premium finishes runs $12,000–$25,000+. The island is often the single largest line item in a kitchen renovation.
- Should the island match the perimeter cabinets?
- It can match or contrast — both are valid design choices. A contrasting island (different colour or material) creates a focal point and adds visual interest. A matching island creates a unified, seamless look. The choice depends on the kitchen style and the homeowner's preference.
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