Your utility is Hydro Westmount, and that changes the questions
Westmount operates its own municipal utility, Hydro Westmount. Residents manage new accounts, moves, billing, outages and the city's energy-efficiency and electric-vehicle programmes through that service rather than through Hydro-Quebec's residential channels. For everyday purposes this is invisible. For a solar project it is decisive, because the rules on connecting a generator and on what happens to exported electricity are set by the utility you are actually connected to.
We cannot tell you what Hydro Westmount's terms for customer generation are, and this page will not invent them. Hydro-Quebec's option d'autoproduction, with its kilowatt-hour bank and its two-year reset, belongs to Hydro-Quebec's customers. A Westmount homeowner is not one, so nothing about that arrangement should be assumed to carry over.
So before you collect quotes, put four questions to Hydro Westmount and get the answers in writing. Does it permit a customer-owned generator to connect to its network, and under what technical conditions. If a system is connected, what happens to electricity exported to the grid: is it credited, purchased, or not compensated at all. What interconnection process, inspection and metering does it require, and what do they cost. And is any of this decided case by case rather than by published rule. The second answer is the one that determines whether a system sized around a summer surplus makes any sense at your address, or whether the design should target consumption you can use as it is generated.
Council approval, By-law 1305 and 39 character areas
Solar panel permits in Westmount are issued by the Permits and Inspections Division, but the permit is not the whole process. Because panels change a building's exterior, they fall under By-law 1305's Site Planning and Architectural Integration Programme, and that requires City Council approval. This is a materially heavier process than a counter permit, and it should be treated as the schedule-defining item in the project.
The scope is total. Westmount divides its whole territory into 39 designated character areas, so there is no part of the city where exterior work escapes the programme and no version of this project that avoids the review. Areas run from the vicinity of St. Joseph's Oratory and Westmount Mountain through Rosemount, the Holton Estate, Forden and Murray Park, Grosvenor Avenue, the Towers of Westmount and the streets around Westmount Park, among many others, and the character of each is what the review is designed to protect.
Cost is calculated from the value of the work under the city's tariffs by-law rather than published as a flat fee for solar, and no specific turnaround time is published. Both facts point the same way: do not commit to a payment schedule tied to an approval date, and ask the Permits and Inspections Division early what a submission for a rooftop installation needs. Ask specifically how visibility from the street is assessed and what mounting profiles and finishes have been approved before, because a review of this kind can determine which roof plane is usable, and roof plane determines production.
An apartment-heavy stock, and who owns the roof
Westmount's 8,590 dwellings are apartment-heavy. High-rise apartments account for 36.8 percent of them and low-rise apartments a further 17.9 percent, while single-detached houses are just 12.6 percent. For most residents here, the roof is common property or the building owner's property, and a solar decision belongs to a syndicate of co-owners or to a building's ownership rather than to an individual.
If that is your situation, the useful work is a written proposal rather than a quote. Ask the syndicate or the building manager for the building's own consumption data, since the common-area account, running corridors, elevators, ventilation and lighting, is often the natural host for an array and avoids the complication of allocating production among units. Then deal with the physical objections before they are raised: the age and condition of the roof membrane, roof loading, access for maintenance, and the conduit route to the electrical room. Read the declaration of co-ownership on work affecting common portions before the meeting rather than after.
Row houses are 13.8 percent of dwellings and semi-detached houses 15.7 percent, together close to 30 percent of the stock, and those usually mean a party-wall roof shared with a neighbour. That makes fixings, penetrations and future roof access a joint decision, and it is far easier to agree in writing before a layout exists. Single-detached owners are the group who can decide alone, though even there the Council approval process above still applies.
Grants: confirm eligibility before you count on anything
The headline Quebec incentive is Hydro-Quebec's LogisVert residential solar grant, which pays $1,000 per kW of installed capacity and covers up to 40 percent of eligible project costs, typically around $5,000 to $6,000 on a residential system. Installations must be completed on or after June 30, 2025 and the claim is filed through the LogisVert portal within 9 months of the installation date. Hydro-Quebec's own projection is that the grant brings a typical residential payback from 25 to 30 years down to roughly 10 to 12 years, though that projection assumes a Hydro-Quebec customer.
Westmount households are Hydro Westmount customers, so whether and on what terms that grant is open to them is a question to settle with the programme in writing before a contract is signed. Ask it at the same time as the interconnection questions above, because the two answers together decide whether a project is viable. The claim window runs from the installation date and cannot be reopened, so an eligibility problem discovered afterwards is not recoverable.
Federally, the Canada Greener Homes Loan, interest-free up to $40,000, stopped accepting new applications on October 2, 2025, and only previously approved loans are still funded. The Canada Greener Homes Affordability Program replaced it in September 2025, delivering no-cost retrofits through provincial partners 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.