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
| 3x6 ft Moon Gate Arbor Plan | 3x4 ft Rose Garden Arbor Plan (Mahogany) | |
|---|---|---|
| Category | Arbors | Arbors |
| Style | Moon Gate | Rose Garden |
| Footprint | 3x6 ft (18 sq ft) | 3x4 ft (12 sq ft) |
| Wood species | Cypress | Mahogany |
| Roof finish | cedar shake shingles | standing-seam metal roofing |
| Difficulty | Intermediate | Intermediate |
| Build time | ~41 hrs | ~23 hrs |
| Materials cost | $325–$500 | $350–$575 |
| Footing depth | 36″ × 2 posts | 36″ × 2 posts |
| Concrete | 4 × 60-lb bags | 4 × 60-lb bags |
| Cut-list items | 5 | 5 |
| Build steps | 9 | 9 |
Cost & budget
The 3x6 ft Moon Gate Arbor Plan lands in the $325–$500 range for materials in Cypress, while the 3x4 ft Rose Garden Arbor Plan (Mahogany) runs $350–$575 in Mahogany. The first plan is approximately 13% more expensive at typical 2026 lumber-yard pricing — driven mostly by the choice of Mahogany over Cypress and the difference in cubic concrete volume between 2 and 2 footings.
Labor & difficulty
At ~41 hours, the 3x6 ft Moon Gate Arbor Plan is rated Intermediate. The 3x4 ft Rose Garden Arbor Plan (Mahogany) takes ~23 hours and is rated Intermediate. The labor delta is roughly 18 hours, or one extra working day on the 3x6 ft Moon Gate Arbor Plan. Both plans require the same skill level, so the deciding factor is footprint and aesthetics rather than your comfort with carpentry.
Footprint & site fit
At 18 sq ft vs 12 sq ft, you are choosing between a focal-point garden structure and a focal-point garden structure. Allow at least 24 inches of clearance on every side for furniture and walking paths — that means the 3x6 ft Moon Gate Arbor Plan needs a clear area of approximately 7×10 ft and the 3x4 ft Rose Garden Arbor Plan (Mahogany) needs 7×8 ft.
Material & durability
The 3x6 ft Moon Gate Arbor Plan is built from Cypress, while the 3x4 ft Rose Garden Arbor 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, 3x4 ft Rose Garden Arbor Plan (Mahogany) 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 3x6 ft Moon Gate Arbor Plan page and the complete 3x4 ft Rose Garden Arbor Plan (Mahogany) page. Both ship with full cut lists, hardware schedules, footing specs, and step-by-step build instructions.