Solar pergolas and patio covers

A conventional pergola is an open lattice on posts, built for dappled shade, and it is not designed to carry a roof. Panels weigh roughly three pounds per square foot and a Colorado wet snow can add 20 to 40 or more on top, plus the wind uplift on a raised, open structure. A typical cedar 4-by-4 pergola from a kit will not pass that check, and we won’t mount on it.

What gets built instead is an engineered aluminum or steel patio cover with panels as the roofing, the same idea as a solar carport at patio scale. Bifacial panels, which collect light from the back as well as the front, are popular here because the gaps between panels let some light through and the reflected light off a light-colored patio adds a little production. Expect a building permit, an engineered drawing and footings, then the electrical permit and interconnection like any array.

Patio covers are nearly flat, typically pitched just enough to drain, which in Colorado means a tilt of a few degrees instead of the 20 to 35 that a house roof gives. Low tilt costs some annual production, on the order of 10–15%, and costs more in winter, when snow sits on a flat surface for days instead of sliding off. A pergola array also tends to be lower to the ground and closer to trees and the house itself, so shading is more common than on a roof.

Bifacial gain helps but doesn’t close the gap; a bright patio underneath adds a modest percentage, not a third. The honest comparison is that the same panels on a decent south or west roof face produce more per year, for less money, with less snow trouble. When we quote a pergola, we put the roof alternative next to it.

If you were going to build a covered patio anyway, the math changes. The structure cost is spent regardless, and roofing it in panels instead of metal or polycarbonate is a smaller increment. That’s the case where a solar patio cover can make sense, especially on a lot where the house roof is shaded, north-facing, historic-district restricted or already full.

Shade has value on its own. A west-facing patio in Colorado is unusable at 4 pm in July; a panel roof fixes that and keeps hail off the furniture. If that comfort is what you’re really buying, be clear-eyed that the solar is the bonus, not the payback engine. The federal residential credit is gone for systems placed in service after 2025, so there’s no 30% offset softening the structure cost as of September 2026.

HOAs come up. Colorado’s C.R.S. 38-30-168 protects solar installations on your property from bans and unreasonable restrictions, but a patio cover is also a structure, and the HOA’s ordinary architectural rules on structures still apply to the pergola itself. Expect a normal architectural review for the cover, with the solar protected once the structure is approved.

Snow on a low-tilt panel roof over a patio has to melt in place; it won’t slide, and you shouldn’t rake it from below with a metal pole near live wiring. That’s a real winter production hit along the Front Range and a bigger one in the foothills. Water and meltwater drain off the low edge, so gutters and the placement of the low edge relative to doors and walkways matter.

Hail is a plus: panels rated for roughly one-inch hail make a better hail roof than polycarbonate. Wiring runs inside the beams or in surface conduit to the house, and the array ties into the main panel like any other. Every joint is outdoors and the underside is visible, so we spend extra care on wire management; a tidy pergola underside is part of what you’re paying for.