Design Guides
Fireplace Design Guide
Updated 2 min read
The short answer
Fireplace design starts with the appliance, not the aesthetic. Every certified appliance publishes minimum clearances to combustible material, and how far a mantel projects from the wall increases the minimum height above the opening. Those numbers set the design envelope before any material or style decision is made.
Clearances govern everything
Wood, MDF and most millwork materials are combustible. An appliance’s installation instructions state how far combustible material must sit from the opening, and that requirement typically increases as a mantel projects further into the room.
Different appliance types have very different requirements. Electric fireplaces generally have the fewest restrictions, direct-vent gas units sit in the middle, and wood-burning appliances are the most demanding. A design that works above one will not necessarily work above another.
If the original documentation is lost, the rating plate inside the firebox identifies the model. Where the requirement cannot be established with confidence, the correct response is a conservative design and — for gas appliances — confirmation from a licensed gas fitter.
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Proportion rules that make a surround look right
- Mantel width relative to the opening
- A mantel shelf typically extends 100–200mm past the surround on each side. Flush with the surround looks abrupt; much wider looks top-heavy.
- Mantel height
- Traditionally 1200–1400mm from the floor in a room with 8–9ft ceilings — but the appliance clearance takes precedence over convention every time.
- Hearth projection
- Where a hearth is present, it should project far enough to read as a base rather than a lip. Wood-burning appliances have code requirements for hearth extension.
- Surround width
- The material framing the opening should be wide enough to read as deliberate — usually 150mm minimum on each side.
- Centring
- Chimney breasts are rarely centred in a wall. Flanking cabinetry usually has to be built asymmetrically to look symmetrical.
- Full-height treatments
- If carrying material to the ceiling, take it all the way. Stopping short of the ceiling on a fireplace wall almost always looks unresolved.
Answers
Frequently asked questions
- Can I put a TV above my fireplace?
- Often yes, subject to appliance clearances and a mantel or hood that deflects rising heat. The bigger practical problem is usually viewing height — a firebox plus a mantel typically pushes a screen above comfortable seated eye level. A tilting or pull-down mount helps. If the room is primarily for watching television, an adjacent wall gives a better result.
- How high must a mantel be above the firebox?
- It is set by the appliance manufacturer, and it increases as the mantel projects further from the wall. There is no universal number — the appliance’s installation instructions are the authority.
- What is the highest-impact fireplace change?
- Replacing a dated surround while keeping the existing appliance. It typically takes one to three days on site, needs no permit, and changes the focal point of the room entirely. The 1990s oak-and-brass surround and the builder-grade tile face are the two most common candidates in Calgary.
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