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
| 20x30 ft Dutch Gable Pavilion Plan (Composite (Trex / Azek)) | 20x30 ft Timber Frame Pavilion Plan (Mahogany) | |
|---|---|---|
| Category | Pavilions | Pavilions |
| Style | Dutch Gable | Timber Frame |
| Footprint | 20x30 ft (600 sq ft) | 20x30 ft (600 sq ft) |
| Wood species | Composite (Trex / Azek) | Mahogany |
| Roof finish | bamboo reed mat overlay | open lattice rafters |
| Difficulty | Intermediate | Advanced |
| Build time | ~51 hrs | ~112 hrs |
| Materials cost | $63,350–$99,000 | $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 20x30 ft Dutch Gable Pavilion Plan (Composite (Trex / Azek)) lands in the $63,350–$99,000 range for materials in Composite (Trex / Azek), while the 20x30 ft Timber Frame Pavilion Plan (Mahogany) runs $55,450–$86,625 in Mahogany. The second plan is approximately 14% more expensive at typical 2026 lumber-yard pricing — driven mostly by the choice of Composite (Trex / Azek) over Mahogany and the difference in cubic concrete volume between 6 and 6 footings.
Labor & difficulty
At ~51 hours, the 20x30 ft Dutch Gable Pavilion Plan (Composite (Trex / Azek)) is rated Intermediate. The 20x30 ft Timber Frame Pavilion Plan (Mahogany) takes ~112 hours and is rated Advanced. The labor delta is roughly 61 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 600 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 20x30 ft Dutch Gable Pavilion Plan (Composite (Trex / Azek)) needs a clear area of approximately 24×34 ft and the 20x30 ft Timber Frame Pavilion Plan (Mahogany) needs 24×34 ft.
Material & durability
The 20x30 ft Dutch Gable Pavilion Plan (Composite (Trex / Azek)) is built from Composite (Trex / Azek), 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, 20x30 ft Dutch Gable Pavilion Plan (Composite (Trex / Azek)) 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 20x30 ft Dutch Gable Pavilion Plan (Composite (Trex / Azek)) 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.