Rooftop Solar on Apartment Buildings: Does It Work in a Syndication?
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Rooftop solar looks like an easy win on an apartment building: a large, flat roof, a lot of sun and a power bill that never goes down. In practice, the savings depend on who pays the electricity, how much of the building's load the panels cover, what the roof can carry, and what the tax and utility rules allow at the time of the deal. Some sponsors do well with solar. Others add a cost that the rents and the bills never repay.
This guide explains how to test a solar project in an apartment syndication, what can go wrong and how to show the case to investors honestly.
Raising for an apartment deal? Start free
Does the owner pay the power?
This question decides the case. In most apartment buildings, residents pay their own unit meters, and the owner pays for the house meters: hallways, the laundry, the pool, the gate and the exterior lights. Solar on the roof offsets the power on the owner's meters first. If the house load is small, most of the output goes back to the grid at a lower rate, or it is wasted, depending on the utility's rules.
Ask the utility for the building's meter map and a year of usage by meter. That shows how much of the electricity the owner can use directly.
What does a project involve?
- A structural check: an engineer confirms that the roof can carry the panels, the racking and the snow and wind loads.
- The roof condition and warranty: a roof with several years of life left is a better host. Many sponsors replace the roof first, then add solar, so the panels do not have to be moved for a repair.
- The electrical work and interconnection: the inverter, the wiring and the utility's approval to connect to the grid. Interconnection can take months.
- Monitoring and maintenance: a system monitor and an annual inspection, which are operating costs.
- Permits: the city's building and electrical permits, which vary.
How do you test the economics?
Build the savings from the building's own usage and the utility's rate schedule, not from the installer's average. Show three cases: the expected output, a lower output for shading or dust, and a case where the interconnection is late or the system is never connected. Then subtract the operating cost of monitoring and maintenance, and the cost of any roof work the panels require.
Keep the tax benefits separate. A tax credit or a depreciation deduction is a different kind of money from the cash the system saves. Ask your CPA to show the two lines apart in the investor model.
Hypothetical example
These figures are made up for illustration. Use the building's own bills, an engineer's load check and a written installer quote.
A 90-unit building pays $3,000 a month in house electricity. A 60-kilowatt system on the roof is expected to cover about 35 percent of that load, which is about $12,600 a year at the building's current rate. The installed cost is $120,000 before any incentive, and the monitoring and annual inspection cost $900 a year. The roof has seven years of life left, so the owner replaces it first for $85,000 in the same year.
| Item | Amount |
|---|---|
| Annual energy savings (expected case, made up) | $12,600 |
| Less monitoring and inspection | ($900) |
| Net annual cash saving, expected case | $11,700 |
| Net annual cash saving, low case (output 20 percent lower, made up) | about $9,200 |
| Installed cost before any incentive | $120,000 |
| Roof replacement, needed before the panels | $85,000 |
The simple payback on the panels alone is about 10 years in the expected case and about 13 years in the low case, before incentives. The roof replacement is a separate capital item that the owner would need in any case, so the solar case should not count it as a saving. The model should show the panels with and without the roof work, so investors can see both.
What should you check before you commit?
- The house meter usage and the utility's rules for net metering or credits, which can change.
- The roof warranty and the racking warranty, and whether the installer's work voids either one.
- The interconnection queue and the utility's timeline, which should appear in the schedule.
- The lender's approval for the panel lease or purchase, if the loan requires it.
- The insurance for the system and the roof penetrations.
How DoorRaise fits in
DoorRaise helps sponsors raise equity for apartment buildings with 5 or more units under Rule 506(b) or 506(c). The deal's budget shows the panels as a capital item, the monitoring as an operating cost and any savings as an estimate with the basis shown. DoorRaise does not choose solar installers or quote energy savings. Setup is $1,500 (non-refundable), and the administration fee is $5,000 a year from closing.
Start with a sponsor page or see the fees.
FAQ
Can residents' unit meters count toward the savings?
Not if residents pay those meters. The owner's savings come from the owner's meters. Check the lease and the utility billing setup before you count any unit savings.
Does solar raise rent?
Not by a fixed amount. Some sponsors offer lower utility costs as a leasing point, but test any rent effect with local comparables.
Should I buy the panels or lease them?
Both work in different cases. A lease or a power purchase agreement changes who owns the system and who keeps the incentives. Ask your CPA and the lender before you choose.
What if the roof leaks after the panels go on?
The panel contractor, the roofer and the warranty decide the fix. Keep the roof and the panel work under one plan, so the warranty covers both.
Sources
- Capital expenditures vs. operating expenses in apartments, for how to classify the panels, the roof and the monitoring.
- Roof replacement in apartment buildings, for the roof work that comes first.
- Cost segregation for apartment syndications, for how depreciation can change the tax picture.
- Example figures are hypothetical. No installer price, incentive amount or utility rate is cited here. Check current incentives with your CPA.
This article is general information, not legal, tax or investment advice. Talk to a securities attorney and a CPA about your deal. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.