Can Your Roof, Barn or Garage Handle Solar? Engineering and Rafter Upgrades
Earthlight Technologies • November 9, 2026
Can Your Roof, Barn, or Garage Handle Solar Panels? Engineering and Rafter Upgrades Explained
Homeowners often ask whether their roof, barn, garage, or pergola is strong enough for solar. Some worry because a roof sags a little, or because a building is older. The answer starts with engineering. At Earthlight, every structure goes through an engineering review before panels go on, and if it needs reinforcement, our team can usually handle that too.
How Earthlight Checks Whether a Structure Can Hold Solar
Our team comes out, takes measurements, and sends everything to a structural engineer. The engineer confirms whether the structure can handle the load of the solar system. If it can, we move forward with installation. If it cannot, and a rafter upgrade or other structural improvement is possible, we make the improvement first.
What a Rafter Upgrade Involves
A common fix is sistering new rafters alongside the existing ones, based on what the engineer specifies. Our install crews double as carpenters, so they may do the rafter upgrade one day and come back the next day to start installing panels. You do not have to hire a separate contractor.
One recent project shows how this works. The home had cathedral ceilings, so there was no attic to work from, and it also needed a new roof. The crew pulled the plywood off the roof, completed the rafter upgrade from above, and then put the plywood back down.
Ground Mounts: An Option Many Installers Skip
If your roof is not the right fit because of dormers, valleys, limited space, or poor sun exposure, a ground mount may be the answer. Many solar companies do not install ground mounts, but Earthlight does. They make up a smaller share of our installs, roughly 5 to 10%, because they cost more. A ground mount needs its own structure, plus trenching and conduit to bring power back to the house, and many homeowners want the array a couple hundred feet away. If your house faces south or has good east or west sun exposure, a roof mount usually makes more financial sense. Compare ground and roof-mounted solar.
Frequently Asked Questions About Solar Structures and Engineering
Can solar panels go on a barn, garage, pergola, or the ground?
Yes, as long as the structure passes engineering. Earthlight takes measurements and sends them to a structural engineer to confirm the structure can handle the load. If it cannot, and a rafter upgrade or other structural improvement is possible, our team can make the improvement. Earthlight also installs ground mounts, which many solar companies do not offer.
What if my roof is not strong enough for solar panels?
If engineering shows your roof cannot handle the load, a structural improvement such as a rafter upgrade may solve it. Earthlight’s install crews can sister in new rafters or make other improvements the engineer specifies, then install your panels. You do not need to coordinate a separate contractor for the structural work.
Can you install solar on a home with cathedral ceilings?
Yes. Without an attic, a rafter upgrade has to be done from above. On one recent project, the home also needed a new roof, so our crew removed the roof plywood, completed the rafter upgrade from the top, and reinstalled the plywood. The engineer’s findings determine exactly what work is needed on each home.
Why do ground-mounted solar systems cost more?
A ground mount needs its own support structure, and power has to be brought back to your home through trenching and conduit. Many homeowners want the array placed a couple hundred feet from the house, which adds to that work. If your roof has good sun exposure, a roof mount usually makes more financial sense.
Do Earthlight’s crews handle carpentry work themselves?
Yes. Earthlight’s install crews double as carpenters for structural work such as rafter upgrades. They can complete the structural improvement one day and start installing panels the next, so your project stays with one company from engineering through installation. It is not another contractor to schedule and manage.
Wondering if your structure can handle solar? Schedule a site visit or learn more about residential solar from Earthlight.
