🔥 1. Fireplaces are considered “recreational features”
The Planning Code treats fixed outdoor elements—such as fireplaces, barbecues, or grills—as recreational structures that are allowed only when they’re small-scale and accessory. Interpretations under §136(c)(20)–(23) define how tall those features can be before they’re considered new structures that violate the rear yard setback.
📏 2. Height limit: 8 feet maximum
- The main body of a fireplace, barbecue, or similar outdoor feature cannot exceed 8 feet above grade.
- A flue or vent may extend slightly above 8 feet if it is narrow—for example, a small-diameter metal or masonry flue designed only for smoke exhaust.
- Any portion broader than a narrow flue (like a tall chimney mass or masonry column) would not qualify as a permitted obstruction and would require a variance.
🔸 Example:
- ✅ An 8-foot-tall masonry fireplace with a 1-foot-wide flue pipe = allowed.
- 🚫 A 10-foot-tall solid chimney structure = not allowed without variance.
🧱 3. Location and design considerations
- The fireplace must remain entirely within the rear yard and below any upper-level decks or projections.
- It must be unroofed, unenclosed, and non-habitable.
- It can’t function as a structural wall or extension of the house.
- Materials must meet California Building Code fire-safety standards (noncombustible construction).
🚫 4. If you exceed 8 feet
Once the structure’s solid mass exceeds 8 feet, the City will treat it as a building projection or rear yard addition, not as an accessory feature. That means:
- It becomes subject to rear yard setback restrictions (§134), and
- It will likely require a variance or discretionary review—both of which are rarely approved for additional bulk in the rear yard.
✅ 5. Quick summary
| Feature | Allowed? | Height Limit | Notes |
|---|---|---|---|
| Outdoor fireplace (open-air) | ✅ | 8 ft above grade | Treated as a recreational feature |
| Narrow flue or vent | ✅ (limited) | Can extend above 8 ft | Must be small-diameter exhaust only |
| Chimney mass or tall column | 🚫 | — | Requires variance |
| Enclosed or roofed fireplace room | 🚫 | — | Counts as a building addition |
🧩 Key Reference
San Francisco Planning Code §136(c)(20)–(23) (Permitted Obstructions)
Interpretations (5/5/89 & 8/86):
“A built-in charcoal grill would be limited to eight feet above grade with a flue extension in the form of a narrow pipe being further exempt. A kiln whose main unit was eight feet high and whose flue was another 10 feet was not a permitted obstruction in the rear yard.”
🔍 Bottom Line
A fireplace up to 8 feet high (with only a narrow flue above) is allowed in a rear yard setback for single-family homes in San Francisco. Anything taller, bulkier, or enclosed would be treated as a structure and require a variance under §134.
