Bonnet Roof: Design, Pros, Cons & Options
A bonnet roof is a hip roof with two slopes on each side: a steep upper slope and a shallower lower slope that flares out past the walls. The wide overhang shelters porches and walls, which is why it is common on French Colonial, Creole, and Southern cottage homes. It looks beautiful, but the slope break needs skilled roofers and careful flashing.
Bonnet roof vs. similar roof designs
Bonnet roofs are often confused with mansard and gambrel roofs. The key difference is which slope is steeper. On a bonnet, the upper slope is steeper and the lower slope flares out. A mansard is the reverse.
| Roof type | Slope layout | Overhang | Best known for |
|---|---|---|---|
| BonnetThis guide | Two slopes per side, steeper above, shallower below | Wide, flared | Covered porches, French Colonial and Southern style |
| Hip | One slope per side, all four sides slope | Standard | Wind resistance and simple, affordable roofing |
| Mansard | Two slopes per side, steeper below, shallower above | Minimal | Extra upper-floor living space, French and Victorian style |
| Gambrel | Two slopes on two sides only | Standard | Barns and Dutch Colonial homes |
| Gable | One slope on each of two sides | Standard | Lowest cost and easiest repairs |
Bonnet roof pros and cons
A bonnet roof trades simplicity for character and shelter. The benefits are real, but so are the extra cost and the extra points where water can enter.
| Factor | Pro | Con |
|---|---|---|
| Shelter | Deep overhang shades porches and windows and keeps rain off the walls | Overhang can catch wind uplift, so fastening and framing details matter |
| Water shedding | The steep upper slope sheds rain and debris quickly | The shallow lower slope sheds water more slowly, so material choice matters |
| Appearance | Distinctive, graceful curb appeal that adds character | Not every neighborhood or HOA approves of it |
| Cost | Long-lasting materials can pay off over decades | Often costs more than a simple hip or gable roof because of added framing, cuts, and flashing |
| Leak risk | Well-built slope breaks perform for decades | The slope break and any valleys are the most common leak points if flashed poorly |
| Repairs and installers | Experienced roofers know exactly where to look | Fewer roofing companies are comfortable with multi-slope roofs, so vet them carefully |
| Snow and ice | Steep upper slope helps shed snow | Snow can stack up on the shallow flare, and ice dams are possible in cold climates |
Best materials for a bonnet roof
The shallow lower slope is the limiting factor. Check each material minimum pitch against the lower slope, not just the steeper upper one.
| Material | Installed cost / sq ft | Lifespan | Fit for a bonnet roof |
|---|---|---|---|
| Architectural asphaltBest value | $4.50 – $8.00 | 20 – 30 yrs | Affordable and easy to repair. Make sure the lower slope meets the 2:12 minimum and use ice-and-water shield at the break. |
| Standing seam metal | $9.00 – $16.00 | 40 – 70 yrs | Works on low slopes and handles the transition well when detailed by a metal specialist. |
| Clay or concrete tile | $8.00 – $25.00 | 40 – 100 yrs | Classic on French Colonial homes. Heavy, so confirm framing and use a low-slope-rated underlayment on the flare. |
| Natural slate | $15.00 – $30.00+ | 75 – 150 yrs | Premium look and life, but the shallow lower slope may fall below the 4:12 slate guideline. |
| Synthetic slate / shake | $9.00 – $18.00 | 40 – 50 yrs | Lighter than natural products. Verify pitch limits, fire and impact ratings, and warranty. |
| Wood shake | $7.00 – $14.00 | 20 – 40 yrs | Needs 4:12 minimum and is restricted in wildfire zones. Rarely right for the lower slope. |
Estimated 2026 national ranges for the material and labor. A bonnet roof typically costs more than the same area of simple roof because of extra labor at the slope break. Always follow the manufacturer pitch requirements and local code, and get itemized quotes.
See what your bonnet roof would cost
Use the Rooferus cost calculator to compare materials side by side, then request quotes from roofing companies near you.
Bonnet roof design options
No two bonnet roofs are quite alike. These are the main choices to settle with your designer and roofer before work begins.
| Option | What it means | Consider |
|---|---|---|
| Straight vs. curved flare | A crisp angled break, or a smooth curved transition | Curves look elegant but cost more and suit metal or custom work best |
| Full wrap vs. porch-only | Flare on all four sides, or only over the porch side | Porch-only simplifies framing and lowers cost |
| Overhang depth | How far the lower slope extends past the walls | Deeper means more shade and shelter, but needs stronger support and uplift detailing |
| Dormers | Windows or vents through the steep upper slope | Add light and attic space, but each one adds valleys and flashing |
| Gutters and drainage | Standard, half-round, or hidden gutters along the flare | Plan for the water speed coming off the steep upper slope |
| Re-roof vs. rebuild | Keep the existing shape or change the pitch | Changing pitch needs engineering and permits |
How to find roofers near me for a bonnet roof
A bonnet roof is not the place to hire the cheapest bid. The best roofing companies near you will have worked on multi-slope roofs and can show you proof.
- Search for roofers with multi-slope experience Ask each roofing company how many bonnet, mansard, or complex hip roofs they have installed, and ask for photos and addresses.
- Verify license and insurance Confirm a valid state or local license, general liability coverage, and workers compensation before anyone steps on your roof.
- Ask how they flash the slope break A good roofer explains the underlayment, step flashing, and sealing details at the transition without hesitation.
- Get three itemized written quotes Compare the same material, the same scope, and the same warranty. Be cautious of a quote far below the others.
- Check warranties in writing Ask for both the manufacturer warranty and the roofer workmanship warranty, and confirm what voids each one.
Bonnet roof questions, answered
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