Most solar conversations start with the roof, and for most houses that is the right answer. But a meaningful number of Michigan properties are better served by putting the array in the yard — and homeowners rarely hear the option because they have already been told that solar means rooftop.
If you have land, it is worth understanding what changes.
When a ground mount is the better answer
Five situations come up repeatedly:
Your roof is shaded. Mature tree cover is common across Michigan, and it is the single most damaging thing for solar production. Trees you would rather keep can make a rooftop array uneconomic while leaving a clear southern exposure fifty feet away.
Your roof is due for replacement. Putting a twenty-five-year array on a roof with eight years left in it means paying to remove and reset the panels partway through. A ground mount decouples the two entirely — you re-roof whenever you like without touching the solar.
Your roof faces the wrong way. A house oriented east–west with a steep pitch gives you two mediocre planes and no good one. On the ground you choose the orientation.
Your roof is too small for your consumption. Particularly relevant if you are heating with a heat pump, charging an EV, or running a well and septic system.
You have a large property anyway. Rural and semi-rural parcels across the state often have an obvious south-facing spot that is doing nothing.
What it costs, and the honest reason why
A ground-mount system runs roughly 14% more per watt than a comparable rooftop system — around $2.96 per watt against $2.60, using current national averages. The array is identical; the difference is entirely in what holds it up.
On a roof, the structure already exists and the racking simply attaches to it. On the ground you are building the structure from nothing: foundations, posts, rails, and a trench carrying conduit back to the house. That is where the money goes.
The frost line is the number that matters in Michigan
Here is the Michigan-specific fact that decides ground-mount design in this state, and it is not wind load.
Michigan requires exterior footings and foundation systems to extend 42 inches below grade. That is a state amendment to the residential building code, and it exists because of frost heave — the ground freezes deep here, and anything sitting shallow gets lifted, repeatedly, until it is out of alignment or damaged.
The practical consequences:
- Ballasted racking generally will not work. The concrete-block-on-grade systems used in milder climates do not satisfy a 42-inch frost depth requirement.
- You are looking at driven piles or poured concrete piers extending below the frost line. That means either a pile driver on site or a set of augered and poured footings, and it is the main driver of the cost premium over rooftop.
- Soil conditions genuinely matter. Sandy soil, clay, high water table and buried rock each change the foundation approach and the price. This is why a real ground-mount quote requires a site visit, not a satellite image.
A building official can modify the requirement on evidence of local conditions, but the 42-inch figure is the starting point, and any installer proposing a shallow-footing system in Michigan should be asked directly how it passes inspection.
The advantage that partly pays for the foundations
Ground mounts cost more to build and then give you something a roof cannot: you choose the tilt and the orientation.
A roof gives you whatever angle the builder chose, usually somewhere between 18 and 30 degrees, facing whichever way the house happens to face. On the ground you can set the array due south at the angle that actually suits Michigan’s latitude — generally in the 30 to 40 degree range for the southern half of the state, with installers often choosing the steeper end of that band.
The steeper end is chosen deliberately, for a reason that matters here more than in most states: snow sheds off a steeper array. A panel at 35 or 40 degrees clears itself far more readily than one lying at 18 degrees on a shallow roof. Given that Michigan’s production is already at its weakest in December and January, losing additional days to snow cover on a shallow array is a real cost — and one of the genuine performance arguments for putting the panels where you can angle them properly.
Ground mounts are also easier to clear by hand when you do need to, and easier to inspect, clean and service without anyone getting onto a roof in February.
Zoning and permitting: expect it to be straightforward, verify anyway
Michigan zoning is local. The Michigan Zoning Enabling Act delegates to townships and municipalities, so the rules that apply to you are your jurisdiction’s, not the state’s.
That said, the model ordinance widely used as a template across Michigan townships treats an accessory ground-mounted solar system as permitted by right in any district where structures are allowed, subject to administrative approval rather than a special land use permit. Typical provisions:
- Height capped around 16 feet, measured to the top of the array at maximum tilt.
- Setbacks matching the district’s requirements for structures, measured from the property line to the nearest point of the array.
- Lot coverage — the array area counts against the accessory-structure coverage limit.
- Placement in the side or rear yard in residential districts.
Because this is a model rather than law, treat it as the likely shape of your local rules and confirm the specifics with your township. An installer who works across Michigan regularly will know which jurisdictions differ.
Interconnection is the same regardless of where the array sits — the system enrolls in the Distributed Generation programme with DTE or Consumers Energy exactly as a rooftop system would, with inflow billed at retail and outflow credited at the lower power-supply rate. That crediting structure is one of the better arguments for pairing a ground mount with storage, since self-consumed power is worth considerably more than exported power.
What to ask before committing
- What is the soil like, and what foundation type does it call for? Driven piles and poured piers price differently.
- How far is the array from the service panel? Trenching is priced per foot and it adds up quickly.
- What tilt are you proposing, and why that angle? There should be a snow-shedding answer as well as a production one.
- Where exactly does it sit relative to setbacks and lot coverage? Get this checked against your township’s ordinance before design is finalised.
- What does the site look like in winter? Shading from bare trees differs from shading in July, and low winter sun angles cast long shadows.
You can model expected production for your own coordinates and tilt with PVWatts, which is a useful sanity check against any number in a proposal.
If the roof is the problem, stop designing around it
A shaded, aging or badly oriented roof is a reason to look at the yard, not a reason to give up on solar. It costs somewhat more to build, the foundations have to respect Michigan’s frost line, and the zoning needs checking — but you get an array pointed the way you actually want it, shedding snow, with a roof you can replace whenever it needs replacing.
Ready to take control of your energy costs and protect your home from Michigan’s frequent outages? Request a free, no-obligation quote from Stellar Solar Michigan — serving Michigan homeowners with solar and battery storage since 1998, A+ rated with the BBB — or call 858-395-6905.