Choosing the right size greenhouse is one of the most important decisions you'll make on your greenhouse journey. Whether you're dreaming of growing fresh veggies all year long or just looking for a cozy backyard retreat to nurture your favorite plants, getting the size right can make all the difference. At BC Greenhouse Builders we're here to help make the choice easier and more confident.
What to Consider Before Buying a Greenhouse: Size, Space & Goals
Your Gardening Goals
Start by thinking about how you want to use your greenhouse. Will it be a space to start seeds in spring? A tropical escape in the winter? A place to grow tomatoes, cucumbers, and peppers all season long? Maybe you want a mix of beauty and function, with room for a comfy chair among the greenery. Your goals will help determine how much space you'll need.
Available Yard Space
Take a good look at your yard or growing area. Measure the space and consider:
- Sunlight exposure
- Access from your house
- Proximity to water and electricity
- Space for ventilation and door swing
Even smaller yards can accommodate a greenhouse—you just need to find the right fit.
Your Budget
While larger greenhouses offer more space and flexibility, they also come with a higher upfront cost. However, investing in a slightly larger size than you think you need can save money in the long run by avoiding an upgrade later. Plus growing your own food and flowers can help offset costs over time.
Future Growth
Many greenhouse owners tell us, "I wish I'd gone bigger." It's common to outgrow your first greenhouse quickly once you realize how fun and rewarding it is. If you have the space and budget, we recommend sizing up just a bit to allow for future expansion.
FUN FACT: All BC Greenhouses can be expanded in length after you purchase them if you do feel you need a bit more room later.
Most Popular Greenhouse Sizes (With Real-Life Examples)
Compact Sizes (6x6, 8x8)
Our most compact greenhouse starts at 6x6, offering just enough room to start seeds, grow herbs, or extend your growing season. If you're working with a small footprint like a patio or narrow garden bed, this size fits the bill.
An 8x8 greenhouse provides significantly more space and flexibility, allowing for better airflow. shelving, and vertical growing. Models like the Legacy and Sunhaven offer compact options without compromising functionality. Both provide thoughtful features like taller sidewalls that make a real difference in usability.
Customer Inspiration: A Backyard Retreat in a 8x8 Greenhouse
Kelly has transformed her 8x8 Legacy greenhouse into both a productive and peaceful space. In spring, she uses it for seed starting—her shelves lined with tiny pots of tomatoes and greens soaking up the early light. But the real magic happens year-round, as the space doubles as her personal retreat. Outfitted with cozy lighting and a warm blanket, Kelly lounges in the greenhouse even in the heart of winter. Her loyal pug is never far behind, often curled up beside her while she enjoys the calm of her garden oasis.
Mid-Size Greenhouses (8x12, 10x12)
Mid-size greenhouses offer a comfortable step up for gardeners ready to expand their growing space. Sizes like 8x12 and 10x12 allow for more flexibility in layout—enough room to move around, set up a potting bench, or create separate zones for propagation and mature plants. This range is ideal for those looking to increase food production or simply enjoy a more organized space.
If aesthetics are important, The Parkside greenhouse is standout in this category. Its decorative base panels and steep roofline give it a classic, high-end look, while still being simple to install on a basic wood foundation. For those more focused on practicality and climate-specific needs, our value models offer a variety of roof pitches and glazing combinations. These options make it easier to customize based on your region's weather and your own growing preferences, whether that means maximizing light, improving insulation, or enhancing airflow.
Customer Inspiration: Seasonal Growing an Relaxation in a Mid-Size Greenhouse
Laura, from New Jersey, has created something truly special with her Parkside greenhouse. Originally chosen to extend her growing season, it quickly became much more than a place for plants. With a custom overhang, decorative base panels, and thoughtful touches like cedar benches, Laura's greenhouse blends functionality with personal style. It's a place where citrus trees bloom in winter, and cozy afternoons are spent tucked inside—surrounded by plants beauty, and inspiration.
Large Greenhouses (12x16 and up)
Large greenhouses are all about versatility and long-term investment. If you're dreaming of growing year-round, cultivating specialty crops, or creating a combined growing and gathering space, this category gives you the room to make it happen. With a larger footprint, it's easier to separate work areas from relaxing zones, manage different climate needs, or even dedicate part of the space to storage or tool benches.
Customer Inspiration: Year-Round Entertaining in a 14x20 Greenhouse
Steve and Dawn have made the most of their Cape Cod 14x20 greenhouse through all four seasons. Located in Wisconsin, they added a cozy woodstove to extend its use year-round. What began as a climate -controlled growing space evolved into something more—a place to gather with friends, host long table dinners, and enjoy the beauty of their garden in every season. Their greenhouse is a blend of form and function, thoughtfully customized to support both plants and people.
How to Choose the Right Greenhouse Size for Your Needs
Ask yourself:
- How many plants do I want to grow?
- Do I need room for potting benches, storage, or seating?
- Will I be using it seasonally or year-round?
- Can I expand later if needed?
QUICK TIP: Layout your potential greenhouse space with rope or garden hose to visualize how much room you'll actually have.
Expert Tips for Picking the Perfect Greenhouse Size
Our team has helped thousands of gardeners find their perfect fit. Here are a few of our top tips:
- Go a size up if you can. Most people wish they had more space once they get started.
- Think about comfort. Will you be standing, bending, or sitting? Extra space improves accessibility.
- Check your local bylaws. Some municipalities have size restrictions or permit requirements for structures over a certain square footage.
Final Thoughts: Find the Best Greenhouse Size for Your Garden
The right size greenhouse depends on your goals, your space, and your lifestyle. There's no one-size-fits-all answer, and that's okay! Whether you're dreaming big or starting small, BC Greenhouse Builders is here to help you grow.
