Sunrooms in Ottawa: permits, heritage districts and installers

Quick answer: a sunroom that adds floor area to an Ottawa house needs a building permit. The City of Ottawa charges $12.52 per square metre of new floor area for houses in 2026, with a $117 minimum, so a 20 m² sunroom is about $250. Ottawa has 20 Heritage Conservation Districts and more than 300 individually designated buildings; an addition to one of those needs a heritage permit, which costs $837 for a staff-approved addition under 30% of the existing floor area.

A note on words: Canadian installers mostly say sunroom, and in Quebec solarium. A three-season room is glazed but usually unheated and lightly insulated, so it is used from spring to autumn; a four-season room is insulated and heated so it works in January; a solarium or conservatory has a glass roof as well as glass walls. Our Canadian sunroom and conservatory costs guide explains the difference in more detail.

Who decides: Building Code Services

The City of Ottawa’s Building Code Services issues building permits under the Ontario Building Code Act. The addition must also meet the zoning by-law; if it does not, you may need a minor variance from the Committee of Adjustment first. Electrical permits come from the Electrical Safety Authority.

Ottawa building permit fees for a sunroom addition

For new buildings and additions, Ottawa multiplies a service index by the new gross floor area, measured to the outside face of the walls:

Work	2026 fee basis	Worked example
Addition to a detached, semi-detached or row house, or duplex	$12.52 per m² of new gross floor area	15 m²: $187.80; 20 m²: $250.40; 30 m²: $375.60
Alterations with no new floor area (for example, closing in an existing porch)	$12.75 per $1,000 of construction value	$20,000 of work: $255
Minimum fee	$117	–
Heritage permit for an addition (staff level, under 30% of existing floor area)	$837 per application	Only for designated or HCD properties

Sources: Gross Floor Area Fee Schedule, revised 1 January 2026, and Comprehensive Building Code Fee Schedule (ottawa.ca); Heritage Permits: Staff-level authority (ottawa.ca). Worked examples are our arithmetic.

Unless the homeowner draws the plans personally or an architect or engineer does, the designer must be registered with the province. Ontario tells homeowners to check designers on the QuARTS public registry before paying for permit drawings.

Heritage Conservation Districts and designated houses

The City of Ottawa says it has over 300 individually designated buildings and 20 Heritage Conservation Districts, with a Heritage Overlay in the zoning by-law that adds requirements for new additions in most designated areas. Under the Ontario Heritage Act, all alterations to designated properties and to properties in an HCD need the City’s approval, and the city names construction of additions first on its list.

Staff-level additions (less than 30% of the gross floor area of the existing building) cost $837. Alterations such as porch changes or new openings cost $279.
Talk to a heritage planner first. The city asks applicants to discuss proposals with the Heritage Planning Branch, which sets the documents and fee. A cultural heritage impact statement may be required.
Heritage approval is not a building permit. The city stresses that heritage approval does not replace the building permit.

Heated or unheated: why the building code cares

Ottawa applies the Ontario Building Code; the 2024 edition came into force on 1 January 2025, and its energy rules for houses are in Supplementary Standard SB-12, which follows the same logic as the national code. Under the energy efficiency rules for houses in Section 9.36, spaces that are not required to be heated are exempt from those energy requirements, and where the house wall is protected by an enclosed unheated space such as a sun porch or enclosed veranda, the insulation needed in that wall may be reduced slightly (by RSI 0.16). In practice that means a three-season room is usually treated as an unheated enclosure kept separate from the house by an exterior-grade wall and door, while a four-season room that is heated and opened up to the house must meet the insulation, glazing and air-tightness rules for the house itself. Remove the dividing door later, or add a heater, and you may need a new permit. See heating a conservatory and glazing, U-values and safety glass.

Snow. The roof of any sunroom has to be designed for the local ground snow load and rain load that the building code sets for Ottawa. This matters more for a low glass or polycarbonate roof sitting under a taller house roof, where snow can slide or drift onto it. Ask who has checked the roof for snow load: the manufacturer’s engineering, a local engineer, or the city’s plan reviewer. Our guide to glass, polycarbonate or solid roofs covers the trade-offs.

Typical private prices

We have not found a reliable sunroom price survey for Ottawa alone, so use the national ranges in our Canadian costs guide. HomeStars (updated August 2026) puts a three-season sunroom at $12,000–$45,000, a four-season sunroom at $25,000–$85,000, a solarium at $30,000–$80,000 and a conservatory at $50,000–$155,000. RenoQuotes (May 2026) quotes $150–$250 per square foot for three-season rooms and $400–$600 per square foot for four-season rooms. City permit fees above, drawings, electrical permits and any heritage application are usually extra unless the quote says they are included. Our guide to what to include in a realistic budget lists the other items that catch people out.

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How to choose an installer in Ottawa

Get it in writing. Ontario law requires any home renovation contract worth more than $50 to be in writing. If the estimate is part of the contract, the price cannot go more than 10% above it without a signed change.
Know your cooling-off right. If you sign a renovation contract worth $50 or more in your home, you can cancel within 10 calendar days for any reason, though you may owe for work already started.
Keep the deposit small. The province recommends a down payment of no more than 10% and never paying in full before the work is done.
Check WSIB and ESA. Ask for WSIB coverage, and check any electrician on the Electrical Safety Authority licence search.
Check the Consumer Beware List. Ontario suggests searching both the business and its operator on the Consumer Beware List before you sign.
Ask who pulls the permits. Get in writing who prepares the drawings, applies for the building and any heritage permit, and books inspections. Our guide to contracts and payment stages has a checklist.

Sunroom firms serving Ottawa

These businesses appear in public business listings for the Ottawa area. We have not checked their work, prices, licences or insurance, and they have not paid to appear.