Can you only install solar on an existing building?

No, solar can be added to a new development or an existing building.

There are a few advantages to doing a solar project during the construction of a new building.

You have a new roof and complete warranty and structural information on the building and roof.
The site is currently under construction so there is no interruption to business operations.

How does installing solar during new construction work?

The solar project is built in sequential phases of the construction project. Your solar developer should work with the building contractor to develop a project plan.

How does installing solar on an existing building work?

You have to consider how old the roof is. The best sites for solar are new roofs or old roofs that already need to be replaced soon.