How Much Does It Cost to Build a Pavilion? 2026 DIY Cost Guide
Last updated: November 2026 · From the KRMPLANS team, designers of DIY building plans
Quick answer: Building a wood pavilion yourself typically costs about $15 to $30 per square foot in materials, or roughly $3,000 to $6,500 for a 12x16, $4,500 to $9,500 for a 16x20, $6,500 to $14,000 for a 20x24, and $10,000 to $21,000 for a 24x30. A concrete slab, electrical, and permits add more. Hiring a contractor often doubles or triples the total.
These are rough 2026 estimates; prices vary by region, lumber market, and design. This guide is for homeowners pricing a backyard pavilion before they commit. It breaks the budget into posts, beams, roof framing, roofing, footings, slab, and extras, so you can see where the money goes and where you can save.
Key Takeaways
- Lumber and roofing usually make up 55% to 70% of a DIY pavilion's materials budget.
- Metal roofing is usually cheaper and faster to install than shingles, which also need sheathing and underlayment.
- A 4-inch concrete slab adds roughly $5 to $9 per square foot DIY, or $8 to $15 per square foot installed.
- Electrical work, often $800 to $3,000 or more, should be done by a licensed electrician.
- Most pavilions over 200 square feet need a building permit; check locally before you dig.
How Much Does a Pavilion Cost by Size?
Pavilion cost scales mostly with roof area, since a bigger footprint needs more posts, longer beams, more rafters or trusses, and more roofing. The table compares DIY materials, a pre-cut kit, and a contractor-built pavilion on footings, without a slab or electrical.
| Size | Area | DIY materials | Pre-cut kit | Contractor built |
|---|---|---|---|---|
| 12x16 | 192 sq ft | $3,000 to $6,500 | $6,000 to $12,000 | $12,000 to $25,000 |
| 16x20 | 320 sq ft | $4,500 to $9,500 | $9,000 to $18,000 | $18,000 to $35,000 |
| 20x24 | 480 sq ft | $6,500 to $14,000 | $13,000 to $25,000 | $25,000 to $50,000 |
| 24x30 | 720 sq ft | $10,000 to $21,000 | $18,000 to $40,000 | $38,000 to $75,000 |
Rough 2026 estimates; prices vary by region. The low end assumes pressure-treated lumber, a simple gable or skillion roof, and exposed-fastener metal. The high end reflects cedar or timber posts, a hip or specialty roof, and standing-seam metal or architectural shingles. Kit and contractor prices often include delivery and labor, which is where most of the difference comes from.
What Goes Into a Pavilion Materials Budget?
A pavilion materials budget breaks into five parts: footings, posts, beams, roof framing, and roofing. Here is how each part is usually priced.
Footings and concrete
Most pavilions sit on concrete piers poured in 12- to 16-inch cardboard tube forms, dug below your local frost line. Expect about $40 to $90 per footing for tubes, bagged concrete, and a post base. A 16x20 pavilion with six posts needs six footings, roughly $250 to $550.
Posts
Posts are typically 6x6 pressure-treated lumber, about $60 to $140 each for 10- to 12-foot lengths, while 8x8 timber or cedar posts can run $150 to $400 or more. Six to ten posts are common on 16x20 to 24x30 pavilions.
Beams
Beams are usually doubled or tripled 2x10 or 2x12 boards, or solid 6x10 to 6x12 timbers, spanning between posts. Budget $400 to $2,500 depending on span and species. Longer spans need deeper beams, which is why wider post spacing costs more than you might expect.
Rafters or trusses
Site-built 2x6 or 2x8 rafters at 24 inches on center are the cheapest roof framing. Prefabricated trusses cost more per piece, often $100 to $350 each, but go up fast. Hip and butterfly roofs need more cuts and hardware than simple gables.
Roofing: metal vs shingles
Metal roofing is usually the better value for an open pavilion. Exposed-fastener panels cost about $1.50 to $4 per square foot, can be screwed to 2x4 purlins, and last 30 years or more. Shingles cost about $1.50 to $3 per square foot, but also need plywood or OSB sheathing ($1.50 to $2.50 per square foot), underlayment, and drip edge, which often makes the shingle roof more expensive overall.
How Much Do a Slab, Electrical, and Permits Add?
A slab, electrical, and permits can add 30% to 80% to the base structure cost. Plan for them early, since they affect footing layout and conduit routing.
- Concrete slab: A 4-inch slab on 4 inches of compacted gravel uses about 1 cubic yard of concrete per 81 square feet. A 16x20 slab needs about 4 cubic yards. Rough 2026 cost is $5 to $9 per square foot DIY or $8 to $15 installed. Pavers or gravel are cheaper alternatives.
- Electrical: Lights, a ceiling fan, and a couple of GFCI outlets often run $800 to $3,000, more if the trench from the house is long. Hire a licensed electrician and pull an electrical permit.
- Permits and plans review: Often $100 to $1,000 or more depending on your jurisdiction and project value.
- Site prep: Grading, stump removal, or gravel can add a few hundred to a few thousand dollars on sloped lots.
Before digging any footing or trench, call 811 to have buried utilities marked. The US Pipeline and Hazardous Materials Safety Administration notes that not calling 811 before digging is against the law and could result in fines, on top of the danger of hitting a line.
Do You Need a Permit for a Pavilion?
Most pavilions need a permit. Many jurisdictions base their rules on the International Residential Code, which exempts small accessory structures; for example, Federal Way, Washington exempts one-story detached accessory structures with a floor area that does not exceed 200 square feet. A 12x16 pavilion (192 square feet) may fall under that line, but 16x20 and larger designs almost always need a permit. Local rules, setbacks, snow and wind requirements, and HOA covenants vary, so check with your local building department first.
DIY vs Kit vs Contractor: Which Is Cheapest?
Building from plans is the cheapest route, usually 40% to 60% less than a contractor, because labor is the biggest single line item. Kits save cutting time but cost more and limit design choices. Contractors cost the most but handle permits, inspections, and heavy lifting.
- Price your size first. Pick the footprint you actually need, then price posts, beams, and roofing from a local lumberyard.
- Get a full shopping list. A plan with a master cut list lets you get an accurate quote instead of guessing.
- Add the extras. Include footings, hardware, fasteners, stain, slab, and electrical in your budget.
- Add 10% to 15% contingency for waste, price changes, and the one beam that warps.
- Compare against kit and contractor quotes with the same size, roof type, and materials.
KRMPLANS pavilion plans include a shopping list and master cut list, which makes step 2 straightforward. The 16x20 hip roof pavilion plans suit a family dining area, while the 20x24 modern skillion pavilion plans use a single-slope metal roof that keeps framing simple.
Common Mistakes to Avoid
- Pricing only the lumber and forgetting post bases, beam brackets, hurricane ties, and structural screws, which can add $300 to $1,000.
- Choosing wide post spacing without pricing the deeper beams it requires.
- Pouring a slab after the posts are set, then fighting the posts with screeds and forms.
- Skipping the permit, which can mean fines or tearing out work at resale.
- Underestimating labor on a 24x30 roof. Large pavilions need at least two or three helpers on raising day.
DIY 24x30 Butterfly Roof Pavilion Plans: Large Modern Backyard PDF: instant PDF download with illustrated steps, a shopping list and cut lists.
Still deciding between structures? Our pergola vs pavilion vs gazebo comparison explains how cost and coverage differ, and the barn pavilion planning guide covers bigger event spaces.
Frequently Asked Questions
How much does a 16x20 pavilion cost to build?
A DIY 16x20 wood pavilion typically costs about $4,500 to $9,500 in materials as a rough 2026 estimate, not counting a slab or electrical. A contractor-built 16x20 pavilion often runs $18,000 to $35,000 depending on region and finishes.
Is it cheaper to build a pavilion or buy a kit?
Building from plans is usually cheaper because you buy lumber locally and supply the labor. Kits cost more but save cutting time and come with pre-cut parts, which some builders find worth the premium.
Is a metal roof or shingle roof cheaper for a pavilion?
Metal is usually cheaper overall because it can be screwed to purlins without plywood sheathing. Shingles need a solid roof deck, underlayment, and drip edge, which adds material and labor.
Does a pavilion need a concrete slab?
No. A pavilion only needs proper footings under each post. A slab is optional and adds roughly $5 to $15 per square foot, while pavers, gravel, or a wood deck are common alternatives.
Do I need a permit to build a pavilion?
Usually yes. Many codes exempt only small detached accessory structures, often up to 200 square feet, and most pavilions are larger. Check with your local building department and HOA before you start.
Sources
- City of Federal Way, WA: Residential Permit Exemptions (IRC Section R105.2)
- US DOT Pipeline and Hazardous Materials Safety Administration: 5 Headaches You'll Avoid by Calling 811 Before You Dig
Price Your Pavilion With a Real Shopping List
The fastest way to an accurate budget is a complete materials list for the exact size you want. Browse our pavilion plans for hip, skillion, and butterfly roof designs with cut lists and framing drawings in feet and inches.
