What a Caledon roof produces each year
Natural Resources Canada's municipal photovoltaic potential dataset puts Caledon at roughly 1,151 kWh a year for every kW of installed panel capacity. That figure describes a well oriented, unshaded array, so treat it as the best case for your property rather than a forecast. A plane facing east or west gives up a meaningful share of it, a north facing plane rarely justifies the equipment, and shading takes its own cut. On larger rural lots the shading culprit is usually mature trees rather than neighbouring buildings, and a tree that clears the array in June may still clip it in the low sun of March and October.
The number is a sizing tool. Take the annual kWh total from your Hydro One bill, divide it by the yield figure, and you have the approximate array size that would match a year of your own consumption. That is the right target in Ontario, because net metering credits your exports against future bills at the retail rate but pays no cash for a net annual surplus. Capacity beyond your own use produces credits that expire rather than income.
Because output swings hard between June and December, and snow can stop production entirely for a period, the credit system is designed to average the year out. Ontario carries unused credits forward for up to 12 months, so the summer surplus covers the winter shortfall. Size against your annual consumption, and be sceptical of any proposal justified by peak summer performance.
Building permits and conservation authority sign off
Caledon requires a building permit for roof mounted solar hot water systems and for most other residential alterations, with fees set out in Schedule B of the Town's Fees By-law. Note the precise wording there: the Town's guidance names solar hot water specifically, which is a different technology from the photovoltaic panels most homeowners are asking about. Rather than reading that either way, confirm directly with the Town what a roof mounted photovoltaic array at your address requires, and ask for the applicable fee line from Schedule B so it can go into the budget rather than surfacing later.
The second approval is the one that is easy to miss. Applications may also need sign off from the Toronto Region Conservation Authority or Credit Valley Conservation, two of four external agencies the Town flags for building permit applicants. Which authority, if any, has an interest depends on where the property sits, so this is a question about your address rather than about Caledon as a whole. It matters for scheduling, because an external agency review is a separate queue with its own timeline and its own information requests.
The way to keep this from stalling a project is to ask the question first. Before equipment is ordered, ask the Town whether your address triggers an external agency review, and if it does, start that file in parallel with the building permit rather than after it. An installer who works in Caledon regularly should know how to run these together, and it is a fair question to put to anyone quoting the job.
The order to do things in with Hydro One
Caledon homeowners deal with Hydro One Networks Inc. for both distribution and net metering, which simplifies matters slightly: one organisation owns the wires, approves the connection, changes the meter and applies the credits. What it does not do is let you leave the paperwork until the end. Applications go to Hydro One's Distributed Connections Group before you incur project costs, using Form C for systems of 12 kW or smaller and Form B for anything larger. Almost every residential rooftop array is a Form C.
Read before incurring project costs literally, because it dictates the sequence of your whole project. The right order is: settle the system size against your consumption, file the Hydro One application, resolve the Town permit and any conservation authority review, then order equipment and book the installation. The wrong order, paying for panels and then discovering a connection or approval condition, is expensive in a way that is entirely avoidable. Ontario also raised the simplified micro embedded generation threshold from 10 kW to 12 kW as of May 1, 2026, so the streamlined process now covers a wider band of residential systems.
Hydro One credits exported solar power for up to 12 months, and residential customers choose between Tiered, Time of Use and Ultra Low Overnight pricing, which sets how those credits are valued. Pick the plan deliberately rather than leaving whatever you are on, since a household that is out all day values midday generation differently from one that is home, and an overnight electric vehicle charge changes the answer again.
Heritage conservation districts in Caledon
Ontario has no United States style homeowners associations, so no neighbours association can stop your panels on aesthetic grounds. What Caledon does have is heritage conservation districts under the Town's own heritage program, which is a district level designation rather than a property by property one. If your home sits inside a designated district, the appearance of work visible from the public realm is a legitimate planning consideration and your panel layout may attract comment.
That is worth raising at the design stage rather than after drawings are finished. Ask the Town whether your address falls inside a heritage conservation district before a layout is finalised, and if it does, ask what has been accepted on comparable properties. Moving an array onto a rear or side roof plane on paper is free; moving it after a refusal is not, and in some cases a rear plane costs less annual output than homeowners expect.
If your property is not in a designated district, heritage is simply not part of your project, and the approvals that matter are the Town permit, any conservation authority review, and Hydro One.
Caledon housing and what it means for a design
Single detached houses account for 80.7% of Caledon's 23,695 dwellings, so for most residents the roof, the electrical service and the decision all sit with the same person. Apartment living is rare here by comparison, about 2% low rise and 1.1% high rise, which means the condominium and landlord questions that dominate solar advice in larger cities apply to a small minority of Caledon households. If you are in that minority, the roof still belongs to the building owner or the corporation, and roof access is a question to put to them before anything else.
The shared wall housing is more significant than the apartment stock. Row housing at about 7.7% and semi detached at about 7% together come to nearly 15% of dwellings. Semis normally still allow an individual install, with the caveat that anything running toward the party wall needs coordinating with the neighbour. Row houses are a tighter design problem: the usable roof plane is narrower, which can cap the number of modules that physically fit and therefore cap system size regardless of what your consumption would justify.
Across all of these, two physical checks are worth doing before quotes: the remaining life of the roof covering, since it is cheaper to re-roof before an array goes up than to remove and reinstall it later, and the capacity of the existing electrical service, which on older properties sometimes needs upgrading and belongs in the budget from the start.
Incentives available to Caledon homeowners
Ontario's Home Renovation Savings Program offers combined rebates of up to $10,000 for solar PV paired with battery storage. It launched in January 2025, and the expanded 2026-27 programme year runs from April 1, 2026 to March 31, 2027. Before you build a budget around it, note the interaction with your Hydro One application: homeowners taking the solar incentive are generally directed toward a load displacement configuration rather than full net metering. Those are different connection outcomes, so confirm with your installer which one your project is actually going to file for.
Federally, the loan most people have heard about is closed. The Canada Greener Homes Loan offered interest free borrowing of up to $40,000 but stopped accepting new applications on October 2, 2025, and only previously approved loans are still being funded. The Canada Greener Homes Affordability Program replaced it in September 2025, delivering no cost retrofits through participating provinces, which do not currently include Ontario, for low to median income households, with solar PV federally eligible but each province setting its own technology list. Canada has no federal investment tax credit for residential solar.
Some Ontario municipalities and utilities periodically run financing arrangements such as local improvement charges or on bill financing that can be applied to solar. These change over time and vary by service area, so ask what is currently available rather than assuming.