The 4 Season Sunroom: A True Home Addition

July 28, 2025

A cozy Winnipeg sunroom with a high wooden ceiling features a beige sectional sofa with blue cushions, round wicker chairs, and a patterned rug. Large windows flood the space with natural light, revealing a wooden deck outside adorned with chic outdoor furniture.

Add Space. Add Light. Add Real Value.

A 4-season sunroom addition is one of the smartest ways to improve your home. It creates a bright, comfortable space you can enjoy every day of the year. It brings in natural light, offers a peaceful atmosphere, and connects you to your backyard through every season.

A True Home Addition

Unlike a seasonal enclosure, a 4-season sunroom is fully insulated and climate controlled. It is built on a permanent grade beam foundation and is considered part of your home’s total square footage.

It can be used as a family room, home office, dining area, or a relaxing place to enjoy natural light and views. Whether you are reading in the morning sun or hosting guests during the holidays, a 4 season sunroom becomes a space you will use and appreciate year round.

To explore examples of how a 4 season sunroom can transform a home, visit our sunroom project gallery or view this detailed case study on a recent 4 season sunroom addition completed by the Deck City team.

3 Season vs 4 Season Sunrooms

Feature 3 Season Sunroom 4 Season Sunroom
Seasonal Use Spring to Fall All Year
Foundation Built on a deck structure Grade beam foundation
Insulation None Insulated walls, roof, and floor
Climate Control Not included Includes heating and cooling
Home Square Footage Not included Included in home’s total square footage
Permits and Code Basic requirements Full building code compliance

Frequently Asked Questions

Is a 4-season sunroom considered livable space?
Yes, it is. A 4-season sunroom is fully insulated, climate controlled, and built on a permanent grade beam foundation. It meets all building code requirements and is included in your home’s total square footage.
Can this space be used as a home office or family room?
It can be used just like any other room in your home. Many homeowners choose to use their 4 season sunroom as a quiet workspace, a reading room, a dining area, or a bright extension of the living room.
How is a 4-season sunroom different from a 3-season sunroom?
The key difference is insulation and year-round usability. A 4 season sunroom is insulated, heated, and cooled, making it suitable for winter. A 3 season sunroom is not climate controlled and is best used from spring through fall.
Is a building permit required for a 4-season sunroom?
Yes, a permit is necessary. Since this type of sunroom is considered a full home addition and adds to your total square footage, it must meet local building code requirements. Deck City handles all permits on your behalf.
What is the typical timeline to build a 4-season sunroom?
Most projects are completed within a few weeks. The timeline depends on the size and design, but you will receive a clear plan before construction begins.
Can a 4-season sunroom be built in the winter?
Yes, winter is often one of the best times to start. Ground conditions are stable, there is less disruption to your landscaping, and your sunroom will be ready to enjoy by early spring.

Built for Comfort and Designed to Last

With over 30 years of experience in Winnipeg, Deck City brings thoughtful design, high quality materials, and expert craftsmanship to every sunroom project. Your space will be designed with care and built to stand up to Manitoba’s seasonal changes, year after year.

Whether you are relaxing with a book or enjoying the company of friends and family, your sunroom will quickly become one of the most used rooms in your home.

An inviting outdoor deck in Winnipeg features a hot tub and cozy seating. Dark wooden steps lead to a glass-enclosed room with illuminated ceiling lights, while potted flowers add vibrant colour. A large tree offers a picturesque backdrop to this serene setting.

Building in Late Fall or Winter Makes Sense

Starting your 4 season sunroom addition in the late fall or winter often makes the most sense. Construction during this time has less impact on your yard, provides greater scheduling flexibility, and ensures your new space is ready for spring.

Start Planning Your Sunroom Addition Today

Deck City has helped hundreds of Winnipeg homeowners bring their outdoor space closer to home with custom sunrooms. Explore our sunroom showroom page to learn more.

Book your consultation and start your project with confidence.

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