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
| 4x8 ft Trellis-Side Arbor Plan | 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar) | |
|---|---|---|
| Category | Arbors | Arbors |
| Style | Trellis-Side | Trellis-Side |
| Footprint | 4x8 ft (32 sq ft) | 4x8 ft (32 sq ft) |
| Wood species | Composite (Trex / Azek) | Western Red Cedar |
| Roof finish | corrugated polycarbonate panels | clear EPDM membrane |
| Difficulty | Advanced | Advanced |
| Build time | ~121 hrs | ~143 hrs |
| Materials cost | $1,100–$1,725 | $525–$825 |
| 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 4x8 ft Trellis-Side Arbor Plan lands in the $1,100–$1,725 range for materials in Composite (Trex / Azek), while the 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar) runs $525–$825 in Western Red Cedar. The second plan is approximately 112% more expensive at typical 2026 lumber-yard pricing — driven mostly by the choice of Composite (Trex / Azek) over Western Red Cedar and the difference in cubic concrete volume between 2 and 2 footings.
Labor & difficulty
At ~121 hours, the 4x8 ft Trellis-Side Arbor Plan is rated Advanced. The 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar) takes ~143 hours and is rated Advanced. The labor delta is roughly 22 hours, or one extra working day on the 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar). 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 32 sq ft vs 32 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 4x8 ft Trellis-Side Arbor Plan needs a clear area of approximately 8×12 ft and the 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar) needs 8×12 ft.
Material & durability
The 4x8 ft Trellis-Side Arbor Plan is built from Composite (Trex / Azek), while the 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar) calls for Western Red Cedar. 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, 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar) 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 4x8 ft Trellis-Side Arbor Plan page and the complete 4x8 ft Trellis-Side Arbor Plan (Western Red Cedar) page. Both ship with full cut lists, hardware schedules, footing specs, and step-by-step build instructions.