London Sunrooms for Southwestern Ontario's Full Four Seasons
Three-season comfort from April through November. Year-round living when you want it.
Three-season comfort from April through November. Year-round living when you want it.
the local climate is more moderate than the London Valley, but it still delivers a full four-season challenge to any outdoor living structure. Humid summers push the humidex into the low 40s on July afternoons. Winters bring freeze-thaw cycling and the occasional ice storm through January and February. The shoulder seasons — London’s long springs and the October evenings that feel like summer one week and winter the next — are the months most homeowners want to be outside and find themselves unable to.
We build three-season rooms and fully insulated four-season additions. A three-season room runs comfortably from the first warm weekend in April through late November, handling the shoulder seasons that outdoor furniture can’t and the damp, cool evenings that send most people back inside. A four-season addition is a permanent, heated room — functional through London’s January grey, comfortable through the August humidity.
Every installation is custom-fitted to your home. Whether your property is a brick home in Old South, a newer build in Lambeth or Hyde Park, a century home in Westmount, or a property backing onto a ravine in Byron, the system is designed for your specific foundation, roofline, and exposure. No off-the-shelf kits. No subcontractors working from a manual.
Three-season: Built for London’s long shoulder seasons. Insulated panels hold warmth through the damp London springs and the cool fall evenings in October — well past the point a standard screen porch becomes uncomfortable. Open-panel options keep air moving during London’s humid July and August. The system closes tight when the weather turns, which in Southwestern Ontario can happen fast.
Four-season: A fully insulated, climate-controlled room addition. Heatable through London’s January cold, coolable through the humid summer heat. This is a permanent addition to your living space — built to the same structural standard as the rest of your home and finished to match.
Grand Vista is a Canadian-made aluminum sunroom system designed for the shoulder seasons — the months when London’s weather is interesting rather than extreme. Larger glass panels, a lighter structural frame, and a connection to the outdoors that heavily insulated four-season systems don’t offer. The right choice for homeowners who want to extend the season without committing to a full room addition. Custom-fitted to your home, backed by the same warranty as all Craft-Bilt installations.
Enjoy London’s summer evenings without the bugs. Craft-Bilt screen rooms and Vista windows give you the outdoor feel with full protection, custom-sized to fit your home.
Keep the bugs out without blocking the view. Craft-Bilt’s pleated screens enclose large openings between your London porch columns with effortless manual control. Open just enough to slip through, or all the way for a summer gathering. PET mesh outlasts competing screen materials, and the cassette snaps off mounting brackets for easy winter storage.
A freestanding outdoor retreat that never rots, warps, or needs repainting. Built on the same premium aluminum components as the Grand Vista sunroom, Craft-Bilt’s luxury gazebo is custom-sized to your London backyard with your choice of gable or single-slope roof, solid or glass kneewalls, and 4-track stacking windows that open 75% for full airflow on warm London evenings. Snow-load rated for year-round stability in Canada’s climate.
DIY Promotion!
Now get 20% off on Grand Vista Sunroom Kits!
Three Season and Insulated Sunroom Kits
See what local homeowners and contractors are saying about their experience with Craft-Bilt products, service, and quality.
Our team is here to help! Contact us for personalized answers to your specific questions.
Q1. What type of sunroom works best for London, Ontario's climate?
London gets warm, humid summers and genuine winters with snow and freeze-thaw conditions. A three-season room extends your patio season from May through October without full heating. A fully insulated four-season sunroom lets you use the space year-round, heated in winter and cooled in summer. The choice comes down to how you plan to use it and your budget. We are happy to walk you through both options.
Q2. Do I need a permit to add a sunroom to my London, Ontario home?
Most sunroom additions in London require a building permit through the City of London. Requirements depend on the size of the structure, whether it is attached to the house, and whether it will be heated. Your Craft-Bilt dealer can help you understand what documentation is needed. We recommend starting the permit process before ordering, as review times at the City of London can vary by season.
Q3. How long does sunroom installation take ?
A standard sunroom installation in London runs between two and five days depending on the size and complexity of the structure. Site preparation and any deck work can add time. Spring and summer are the busiest seasons in London, so reaching out in late winter gives you the best shot at your preferred installation window.
Explore the latest company updates, project highlights, expert insights, and outdoor living inspiration from Craft-Bilt.
Whether you’re looking to add value to your home to sell, or you’re undertaking home improvements to upgrade your property for changing family needs, the three questions you should ask yourself are “is it beautiful?
