Sunroom addition cost in Montreal, CA
Lifestyle upgrade
In Montreal, CA, a midrange sunroom addition typically costs around C$61,700 — about 10% below the national average, reflecting local labour and material prices. On average it recoups about 50% of its cost at resale.
Montreal is the most affordable of Canada's big metros for renovation, with lower labour rates than Toronto or Vancouver, though permitting and language-of-trade logistics can add time.
Local cost factors in Montreal, CA
- Lower labour rates
- Montreal's trade rates are the lowest of Canada's big three metros, keeping totals down.
- Borough permitting
- Permitting is handled at the borough level and can add time; requirements vary across the island.
- Plex housing stock
- Iconic duplex and triplex 'plexes' with exterior staircases create common but distinctive renovation patterns.
| Estimated cost in Montreal, CA | C$61,700 |
| Typical range | C$52,400 – C$70,900 |
| Resale value added | C$30,800 |
| Cost recouped (ROI) | 50% |
| National average (for comparison) | $50,000 |
What's included
- Foundation or reinforced slab
- Framing and large glazed walls/roof
- Insulation and climate control (four-season)
- Flooring, electrical and lighting
- Permits and professional fees
Pro tip: A four-season room that ties into the home's heating and finishes reads as real living space and returns more; a three-season or screened room is cheaper but recoups noticeably less.
What affects the cost of a sunroom addition
- Three- vs four-season
- Insulation, glazing and climate control make a four-season room cost — and return — more than a screened one.
- Foundation
- A slab or reinforced foundation for a heated room costs more than a simple deck-style base for a three-season room.
- Glazing extent
- More glass and higher-performance windows raise both cost and comfort.
- HVAC tie-in
- Extending heating and cooling into the room is what makes it count as living space — and adds cost.
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Sunroom addition in Montreal, CA: common questions
General guidance for sunroom addition projects — figures quoted are national averages; see the table above for Montreal, CA estimates.
How much does a sunroom cost in 2026?
About $50,000 on average, from roughly $25,000 for a three-season room to $80,000+ for a fully insulated four-season room.
Does a sunroom add value?
It recoups around 50% of its cost — a four-season room that counts as living space returns more than a three-season or screened one. Treat it as a lifestyle addition.
Three-season or four-season sunroom?
A four-season room costs more but is usable year-round and adds to counted living area; a three-season room is cheaper but limited to mild weather.
Is a sunroom cheaper than a regular addition?
Usually yes — its glazed, lighter construction costs less per square foot than a conventional framed addition, though it also returns less.
Other locations
Regional figures apply a local cost adjustment to national midrange averages and are planning estimates only — confirm with local contractor quotes. Not financial or real-estate advice. Reviewed June 2026. See our full methodology →
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