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
| 12x16 ft Hot Tub Pavilion Plan | 14x18 ft Hot Tub Pavilion Plan | |
|---|---|---|
| Category | Pavilions | Pavilions |
| Style | Hot Tub Pavilion | Hot Tub Pavilion |
| Footprint | 12x16 ft (192 sq ft) | 14x18 ft (252 sq ft) |
| Wood species | Black Locust | Composite (Trex / Azek) |
| Roof finish | aluminum louvered system | bamboo reed mat overlay |
| Difficulty | Advanced | Advanced |
| Build time | ~138 hrs | ~102 hrs |
| Materials cost | $13,950–$21,775 | $26,625–$41,600 |
| 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 12x16 ft Hot Tub Pavilion Plan lands in the $13,950–$21,775 range for materials in Black Locust, while the 14x18 ft Hot Tub Pavilion Plan runs $26,625–$41,600 in Composite (Trex / Azek). The first plan is approximately 91% more expensive at typical 2026 lumber-yard pricing — driven mostly by the choice of Composite (Trex / Azek) over Black Locust and the difference in cubic concrete volume between 6 and 6 footings.
Labor & difficulty
At ~138 hours, the 12x16 ft Hot Tub Pavilion Plan is rated Advanced. The 14x18 ft Hot Tub Pavilion Plan takes ~102 hours and is rated Advanced. The labor delta is roughly 36 hours, or one extra working day on the 12x16 ft Hot Tub Pavilion 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 192 sq ft vs 252 sq ft, you are choosing between a generous patio cover and a full outdoor room. Allow at least 24 inches of clearance on every side for furniture and walking paths — that means the 12x16 ft Hot Tub Pavilion Plan needs a clear area of approximately 16×20 ft and the 14x18 ft Hot Tub Pavilion Plan needs 18×22 ft.
Material & durability
The 12x16 ft Hot Tub Pavilion Plan is built from Black Locust, while the 14x18 ft Hot Tub Pavilion Plan calls for Composite (Trex / Azek). 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, 12x16 ft Hot Tub Pavilion 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 12x16 ft Hot Tub Pavilion Plan page and the complete 14x18 ft Hot Tub Pavilion Plan page. Both ship with full cut lists, hardware schedules, footing specs, and step-by-step build instructions.