If you have narrowed your shortlist to two specific designs, this is exactly the kind of decision where a side-by-side spec view saves a weekend of second-guessing. Both plans below are complete, code-aware DIY builds, but they differ on the things that matter for a backyard project — total cost, raw labor hours, footprint, and the wood species on the cut list.
Side-by-side specs
| 24x30 ft Dutch Gable Pavilion Plan | 20x30 ft Timber Frame Pavilion Plan (Mahogany) | |
|---|---|---|
| Category | Pavilions | Pavilions |
| Style | Dutch Gable | Timber Frame |
| Footprint | 24x30 ft (720 sq ft) | 20x30 ft (600 sq ft) |
| Wood species | Black Locust | Mahogany |
| Roof finish | tensioned 320-gsm shade sail fabric | open lattice rafters |
| Difficulty | Intermediate | Advanced |
| Build time | ~24 hrs | ~112 hrs |
| Materials cost | $52,275–$81,700 | $55,450–$86,625 |
| Footing depth | 36″ × 6 posts | 36″ × 6 posts |
| Concrete | 12 × 60-lb bags | 12 × 60-lb bags |
| Cut-list items | 7 | 7 |
| Build steps | 12 | 12 |
Cost & budget
The 24x30 ft Dutch Gable Pavilion Plan lands in the $52,275–$81,700 range for materials in Black Locust, while the 20x30 ft Timber Frame Pavilion Plan (Mahogany) runs $55,450–$86,625 in Mahogany. The first plan is approximately 6% more expensive at typical 2026 lumber-yard pricing — driven mostly by the choice of Mahogany over Black Locust and the difference in cubic concrete volume between 6 and 6 footings.
Labor & difficulty
At ~24 hours, the 24x30 ft Dutch Gable Pavilion Plan is rated Intermediate. The 20x30 ft Timber Frame Pavilion Plan (Mahogany) takes ~112 hours and is rated Advanced. The labor delta is roughly 88 hours, or one extra working day on the 20x30 ft Timber Frame Pavilion Plan (Mahogany). If you are newer to outdoor woodworking, the 20x30 ft Timber Frame Pavilion Plan (Mahogany) is the safer pick — it uses simpler joinery and fewer compound cuts.
Footprint & site fit
At 720 sq ft vs 600 sq ft, you are choosing between a full outdoor room and a full outdoor room. Allow at least 24 inches of clearance on every side for furniture and walking paths — that means the 24x30 ft Dutch Gable Pavilion Plan needs a clear area of approximately 28×34 ft and the 20x30 ft Timber Frame Pavilion Plan (Mahogany) needs 24×34 ft.
Material & durability
The 24x30 ft Dutch Gable Pavilion Plan is built from Black Locust, while the 20x30 ft Timber Frame Pavilion Plan (Mahogany) calls for Mahogany. The species choice drives the cost delta and the maintenance schedule. Pressure-treated southern yellow pine is the cheapest and most rot-tolerant for in-ground posts; western red cedar is the DIY favorite for visible parts; redwood and white oak are heritage choices that command a premium.
Verdict
For a builder weighing these two specifically, 24x30 ft Dutch Gable Pavilion Plan is the faster build. If both fit your budget and yard, default to the design whose style language matches the rest of your house — a Craftsman bungalow looks awkward beside a modern slatted pergola, and vice versa.
Read each plan in full before committing: the complete 24x30 ft Dutch Gable Pavilion Plan page and the complete 20x30 ft Timber Frame Pavilion Plan (Mahogany) page. Both ship with full cut lists, hardware schedules, footing specs, and step-by-step build instructions.