People use "pergola" and "gazebo" interchangeably, then get two quotes thousands of dollars apart and wonder why. One detail separates them.
A pergola has an open roof — rafters with purlins across them. It filters sun and lets rain straight through.
A gazebo has a solid roof: sheathing, underlayment, then shingles or metal. It keeps rain off, so it has to be built like a small building.
Everything else follows from that — the framing, the foundation, the permit and the price.
A naming note, since it trips people up. A true gazebo is octagonal with a deck floor. The square, hip-roofed version most Bay Area yards get is technically a pavilion. Everyone calls it a gazebo, so we will too.
What it will not do is keep you dry. A louvered aluminum pergola closes to a watertight roof, at a real jump in cost.
This is where a gazebo stops being a bigger pergola.
A hip roof means hip rafters running to each corner and jack rafters filling between them, every cut a compound angle. It is harder than deck framing, and it is where most DIY gazebo builds stall.
Then it has to work as a roof: sheathing, underlayment, shingles or metal, hip caps down every hip, flashing and drip edge. Plus bigger posts, beams and footings to carry the weight and the wind.
None of that exists on a pergola. That is the price gap.
Skip the styling question. Ask what you want to do out there when the weather is not perfect.
Two notes. A solid roof over a west-facing patio does far more for summer afternoons than a pergola will. And anything electrical out there wants a roof over it.
In most California cities a freestanding structure under 120 square feet — about 10 by 12 — needs no building permit. Above that, you are permitting.
Four things void the exemption at any size:
And the one almost everyone misses: setbacks apply even when the permit does not, usually three to five feet from a property line. Permit-exempt is not zoning-exempt.
Rules vary between cities, so check before anything gets poured. Thinking of attaching it instead? Our guide to attached patio covers covers that connection.
Much of the Oakland and Berkeley hills, Marin, and the South Bay hillsides sit in designated fire severity zones.
Chapter 7A of the California Building Code names gazebos, trellises, arbors and patio covers. A permitted structure needs noncombustible or ignition-resistant materials. The requirements start within 3 feet of the house and fall away past 50 feet. Permits pulled from January 1, 2026 fall under the 2025 WUI code.
It changes material and cost, so settle it before design.
A pergola runs close to half a gazebo for the same footprint. The gap is the roof and everything it forces: roofing material, heavier framing, bigger footings, slower labor, and a far better chance of needing a permit.
Budget for the surprises too — foundation work on sloping ground, permit and plan fees, and electrical if you want the space usable after dark.
Redwood and cedar are the Bay Area defaults: naturally rot-resistant, and they take a stain. Aluminum costs less and needs no maintenance, but reads differently beside a wood-sided house. Planning a deck in the same yard? Price them together.
Decide the roof first. Open roof: simpler, cheaper, no rain protection. Solid roof: real framing, real roofing, usable year-round.
Then check two things before you fall in love with a design — whether it clears 120 square feet, and whether you are in a fire zone.
The roof. A pergola has an open roof of rafters and purlins that filters sun and lets rain through. A gazebo has a solid roof — sheathing, underlayment and shingles or metal — that keeps rain off. That drives everything else: a gazebo needs heavier framing, bigger footings and real roofing work, and is far likelier to need a permit. It is why the two price so differently.
Usually not, if it is freestanding and under 120 square feet — about 10 by 12. Four things void that at any size: attaching it to the house, adding electrical, exceeding about ten feet in height, or running plumbing or gas. Setbacks still apply even when a permit does not, typically three to five feet from a property line. Rules vary between cities, so confirm with your building department first.
A pergola, usually close to half for the same footprint. The gap is the roof: roofing material, plus the heavier framing and larger footings needed to carry it, plus slower labor because hip framing is difficult work. A pergola is also likelier to fall under the permit exemption, which saves fees and weeks of schedule.
It depends on purlin spacing, which you decide at design time. Closer spacing gives deeper shade, wider spacing lets more light through. A pergola will never match a solid roof and will not keep rain off at all. For real shade over a west-facing patio, space it tight, add a canopy, or build the solid roof.
Yes. A pergola is top-heavy and has no walls to resist racking, so a strong sideways push can fold the post-to-beam joint like a hinge. A knee brace set at roughly 45 degrees turns each corner into a triangle and carries lateral force down the post into the footing. They belong at all four corners — they are structure, not decoration, and leaving them off is a common reason a pergola starts to lean.
Yes, and it is common — but attaching changes the project. It needs a permit regardless of size, because the connection affects the house's structure. It has to tie into framing rather than fascia or eaves, and it has to be flashed where the two roofs meet, or you have built a leak.
Redwood and cedar are the defaults — both naturally rot-resistant, both weather well here, both take a stain. Pressure-treated fir costs less and is fine for members that will be covered or stained. In a fire severity zone material is not just preference: Chapter 7A requires noncombustible or ignition-resistant materials on permitted structures.
You need proper footings, not necessarily a slab. Concrete piers under each post, dug below grade, are the standard for both structures. Deck blocks sitting on the surface show up in DIY plans and are not what we would build on here, especially under a solid roof that catches wind. If the ground slopes, foundation work becomes a real line item.
In a designated fire severity zone, Chapter 7A applies to permitted gazebos, trellises, arbors and patio covers and requires noncombustible or ignition-resistant materials. Requirements apply within three feet of the house and generally fall away at fifty feet or more. Permits pulled from January 1, 2026 fall under the updated 2025 WUI code. Settle it before design, since it changes material and cost.
