3-season solarium vs. 4-season solarium: which to choose in Quebec?

You are considering adding a 3-season solarium Or a four-season space on your property in Quebec? This decision directly influences your budget, your comfort, and the value of your home. Our guide compares these two options to help you make the right choice according to your needs and the Quebec climate.

What is a 3-Season Solarium?

A 3-season sunroom is an enclosed home extension designed for use from spring to fall. This uninsulated, glass-enclosed structure for winter protects against summer and autumn weather while maximizing natural light.

Main features of the 3 seasons

Construction

  • Durable aluminum frame
  • Single or double glazing
  • Installation on an existing concrete slab
  • No deep foundation required

Usage

  • About 300 days a year in Quebec
  • Ideal from May to October
  • Pleasant on sunny winter days
  • Not designed for prolonged -30°C

Visit horizontal sliding windows allow for maximum ventilation in summer, transforming your space into a comfortable, open room on hot Quebec days.

What is a 4-Season Solarium?

A four-season sunroom is a true habitable extension of your home, usable year-round, even during Quebec's harsh winters. This insulated structure requires permanent foundations and a heating system.

Main features of the 4 Seasons

Construction

  • Below-freezing concrete foundations
  • Triple glazing with Low-E
  • Complete insulation (walls, roof, floor)
  • Integrated heating system

Usage

  • 365 days a year
  • Comfortable even at -30°C
  • Year-round habitable room
  • Increase the living area of the house

Our 4-season rigid awnings offer superior insulation and optimal resistance to Quebec's winter conditions.

Comparison Table: 3 Seasons vs. 4 Seasons

Criteria Solarium 3 Saisons 4-Season Sunroom
Usage period ~300 days/year (spring-fall) 365 days/year
Isolation Minimal (single/double glazing) Complete (triple glazing, Low-E)
Foundations Existing database or simple base Foundations below frost line (mandatory)
Heating Not required (passive greenhouse effect) Heating system required
Average initial cost 25,000$ – 30,000$ 35,000$– 45,000$ +
Annual energy costs Minimums (no heating) Significant (winter heating)
Construction time 2-4 weeks 6-10 weeks
Permit required Yes (check municipality) Yes (stricter requirements)
Added value to the home Moderate Living space

Pros and Cons of a 3-Season Solarium

✓ Advantages

  • Lower initial investment 30-40%
  • Fast installation (2-4 weeks)
  • No winter heating costs
  • Exceptional natural ventilation in summer
  • Perfect for extending the outdoor season
  • Fewer construction constraints

✗ Disadvantages

  • Unusable during severe cold
  • No permanent heating
  • Do not add official living space
  • Moderate resale value
  • Furniture must withstand temperature variations

Advantages and Disadvantages of a Four-Season Sunroom

✓ Advantages

  • Usable all year, even at -30°C
  • Add a real habitable room
  • Significantly increase the value of the house
  • Optimal thermal comfort
  • Permanent living space
  • Best soundproofing

✗ Disadvantages

  • Initial investment 40-70% higher
  • Significant annual heating costs
  • Longer and more complex construction
  • Required foundations below frost line
  • Stricter building permits
  • Less natural ventilation in summer

Cost Comparison: Total Investment

Solarium 3 Saisons

Budget-friendly option
25,000$ – 30,000$
  • Includes: Full structure
  • Foundations: Base plan ($)
  • Installation: 2-4 weeks
  • Annual heating: 0$ – 200$
  • Total 5 years ~29 000$

4-Season Sunroom

Permanent option
35,000$– 45,000$ +
  • Includes: Isolated structure
  • Foundations: Under the frost (8,000$– 12,000$)
  • Installation: 6-10 weeks
  • Annual heating: 800$ – 1,500$
  • Total 5 years ~51,000$ – 65,000$

Key points on costs

  • The initial gap of 10,000$ – 20,000$ widens with annual energy costs
  • The 3 seasons are depreciated in terms of usage over 300 days/year without heating.
  • The 4 seasons adds a room to your municipal assessment (higher taxes)
  • Costs vary depending on the size, complexity, and chosen finishes.

How to Choose Between a 3-Season and a 4-Season Tent

Your choice depends on several personal and practical factors. Here's a guide to help you decide:

Choose a 3-Season if:

  • You want to maximize the use of your courtyard 8-9 months a year
  • Votre budget est de 25 000$ – 30 000$
  • Are you looking for a space to host this summer
  • You prefer to avoid heating costs
  • You already have enough winter living space
  • You like maximum natural ventilation

Choose a 4 Seasons if:

  • You need a room that can be used 365 days a year.
  • Your budget is over 40,000$
  • You want to enlarge your living space
  • You are looking to maximize resale value
  • Are you planning to use it as an office or a family room?
  • Winter comfort is a priority

Key Decision Criteria

1. Intended Use: A 3-season sunroom is perfect for summer meals, spring relaxation, and autumn evenings. A 4-season room becomes your year-round family room, home office, or winter reading nook.

Available budget: If your budget is limited to $30,000$or less, the 3-season offers excellent value. With $40,000$ +, the 4-season becomes a viable option.

3. Time Horizon: Do you plan to stay in this house for more than 10 years? The 4 Seasons is a long-term investment. For 5-7 years, the 3 Seasons offers more flexibility.

4. Climate of your region: In the Québec and Lévis region, both options work well. The 3-season (enclosure) benefits from approximately 300 usable days thanks to the natural greenhouse effect that retains heat on sunny days, even in late autumn.

Specific Considerations for Quebec's Climate

The climate in Quebec directly influences the performance of your solarium. Here's what you need to know:

3 Seasons Performance in Quebec

Climate performance data

  • May to September: Optimal use, comfortable temperature without heating
  • October-November: Still pleasant on sunny days (natural greenhouse effect)
  • March-April: Reusable as soon as the sun returns
  • December-February: Little usable during severe cold (-20°C and below)
  • Passive solar gain: Can reach +20°C even when it's 0°C outside

Performance of the Four Seasons in Quebec

The 4-season solarium is designed to withstand Quebec's harsh climate. With adequate insulation (minimum R-value of 7-8 for the walls, compared to R-24 for a standard house), it maintains comfort even during extreme cold snaps.

However, this complete insulation comes with an energy cost: heating a largely glazed space in the Quebec winter can represent 800$ to 1,500$ annually in electricity, depending on the area and insulation.

Regulations and Permits in Quebec

Important: The two types of solariums generally require a building permit in Quebec, but the requirements differ.

Permit for 3-Season Solarium

  • Building permit required in most municipalities
  • Plans and necessary quotes
  • Adherence to setback margins
  • Zoning compliance check
  • Approval time: typically 2-4 weeks

Permit for 4-Season Solarium

  • Building permit required
  • Plans signed and sealed by an engineer (often required)
  • Compliance with the Quebec Construction Code (CCQ)
  • Foundation and structural inspection
  • Electrical and heating certification
  • Approval time: 4-8 weeks

At Solarium EZ Sun, we assist you with all permit procedures and provide the necessary plans for your application.

Need help with your solarium project?

Our team will guide you in choosing between 3-season and 4-season options based on your budget, needs, and property.

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Frequently Asked Questions (FAQ)

How much does a 3-season vs. 4-season solarium really cost in Quebec?
A 3-season sunroom generally costs between $25,000$and $30,000$including installation, without major foundations. A 4-season sunroom requires an investment of $35,000$ to $45,000$ or more, including below-frost foundations ($8,000$ – $12,000$ extra) and complete insulation. Over 5 years, including annual heating costs ($800$ – $1,500$ /year for the 4-season), the total difference can reach $20,000$ – $35,000$ .
Can I really use a 3-season solarium in winter in Quebec?
Yes, but in a limited way. During sunny winter days, the natural greenhouse effect can maintain a pleasant temperature even when it's 0°C outside. However, during extreme cold (-20°C and below) or at night, a 3-season room is not designed to be comfortable without an auxiliary heat source. On average, in Quebec, you will enjoy your 3-season solarium approximately 300 days a year (spring, summer, autumn + beautiful winter days).
Will a four-season solarium increase my property taxes?
Yes, generally. A 4-season solarium is considered a permanent extension of your home (with foundations and insulation), so it increases the municipal assessed value of your property, which can raise your property taxes. A 3-season solarium, while it can also influence the assessment, generally has a lesser impact because it is not considered permanent living space. Contact your municipality to find out the precise impact on your assessment.
Can a 3-season sunroom be converted into a 4-season room later on?
It's technically possible, but rarely economical. The transformation would require adding foundations below the frost line, replacing all glazing with insulating triple-pane windows, installing a heating system, and reinforcing the complete insulation. These modifications would cost almost as much as building a new four-season structure. If you're hesitating between the two, it's better to invest directly in a four-season structure from the start rather than planning a future conversion.
Which option offers the best resale return on investment?
The 4-season sunroom generally offers a better long-term return on investment because it adds official living space to your home. However, the 3-season can have a better cost-benefit ratio if you sell within 5-7 years, as the initial investment is 30-40% lower and it appeals to buyers looking for a protected outdoor space. The best choice depends on your time horizon: 4-season for the long term (10 years+), 3-season for more flexibility in the short to medium term.

Conclusion: Which Solarium to Choose in Quebec?

The choice between a 3-season and a 4-season solarium primarily depends on your priorities:

The 3-season solarium It's the best choice if you're looking to extend your outdoor season from May to October, have a budget of $25,000$– $30,000$, and prioritize a bright space without heating costs. It's the ideal option for summer entertaining, enjoying autumn evenings, and creating a pleasant transition between your home and your yard.

The four-season solarium This is the best option if you need a usable space 365 days a year, your budget exceeds $40,000$, and you want to add a true living space to your home. It's the optimal investment for a home office, a permanent family room, or to maximize long-term resale value.

Both options are perfectly suited to the Quebec climate when well-designed and built to appropriate standards. Whether you choose a 3-season solarium Ez Sun or a permanent four-season room, you will create a bright living space that will transform your relationship with your home.

You can also explore our bioclimatic pergolas if you are looking for an intermediate solution offering adaptable protection according to the seasons.

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