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
| 3x4 ft Moon Gate Arbor Plan | 3x4 ft Pergola Archway Arbor Plan | |
|---|---|---|
| Category | Arbors | Arbors |
| Style | Moon Gate | Pergola Archway |
| Footprint | 3x4 ft (12 sq ft) | 3x4 ft (12 sq ft) |
| Wood species | Pressure-Treated Pine | Black Locust |
| Roof finish | tensioned 320-gsm shade sail fabric | retractable canvas awning |
| Difficulty | Advanced | Intermediate |
| Build time | ~50 hrs | ~33 hrs |
| Materials cost | $150–$225 | $275–$450 |
| 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 3x4 ft Moon Gate Arbor Plan lands in the $150–$225 range for materials in Pressure-Treated Pine, while the 3x4 ft Pergola Archway Arbor Plan runs $275–$450 in Black Locust. The first plan is approximately 100% more expensive at typical 2026 lumber-yard pricing — driven mostly by the choice of Black Locust over Pressure-Treated Pine and the difference in cubic concrete volume between 2 and 2 footings.
Labor & difficulty
At ~50 hours, the 3x4 ft Moon Gate Arbor Plan is rated Advanced. The 3x4 ft Pergola Archway Arbor Plan takes ~33 hours and is rated Intermediate. The labor delta is roughly 17 hours, or one extra working day on the 3x4 ft Moon Gate Arbor Plan. If you are newer to outdoor woodworking, the 3x4 ft Pergola Archway Arbor Plan is the safer pick — it uses simpler joinery and fewer compound cuts.
Footprint & site fit
At 12 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 3x4 ft Moon Gate Arbor Plan needs a clear area of approximately 7×8 ft and the 3x4 ft Pergola Archway Arbor Plan needs 7×8 ft.
Material & durability
The 3x4 ft Moon Gate Arbor Plan is built from Pressure-Treated Pine, while the 3x4 ft Pergola Archway Arbor Plan calls for Black Locust. 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 Moon Gate Arbor Plan is the clear budget pick. 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 3x4 ft Moon Gate Arbor Plan page and the complete 3x4 ft Pergola Archway Arbor Plan page. Both ship with full cut lists, hardware schedules, footing specs, and step-by-step build instructions.