5 Mistakes to Avoid When Planning Your Garage

Get it right the first time with these essential tips.

Planning a garage might seem straightforward - four walls, a roof, and a door, right? Not quite. Whether you're building a detached garage for storage, a workshop, or to boost your home's value, avoiding a few common mistakes can save you time, money, and a lot of frustration.

Here are 5 mistakes to avoid when planning your garage:

1. Underestimating the Size You’ll Need

One of the biggest regrets homeowners have is building a garage that’s just a little too small. What feels spacious when empty can quickly feel cramped once you add vehicles, tools, bikes, and seasonal gear.

Tip: Go a little bigger than you think you'll need - especially in width, ceiling height, and storage space. Think about what you'll use the garage for now and what you might want down the road (like a boat, larger vehicle, or hobby workspace).

2. Forgetting Local Zoning & By-Law Requirements
Before you fall in love with a garage plan, make sure it actually works where you live. Every municipality has its own zoning and by-law rules that can affect setbacks, maximum height, lot coverage, and even where a garage is allowed on your property.

Tip: Start by contacting your local zoning or by-law department to get a clear picture of what rules apply to your lot before moving forward.
And don’t worry - we’ve got the Ontario Building Code side of things covered. Our plans are designed to comply with OBC standards, so once zoning checks out, you’re already one big step ahead

3. Overlooking Future Electrical and Heating Needs

A basic garage might only need a light and a plug. But if you're planning to use the space for a workshop, electric vehicle charging, or as a future man cave or studio, you’ll need to plan ahead.

Tip: Talk to an electrician early and consider roughing in wiring, outlets, or even radiant heating - before the concrete is poured or the walls go up.

4. Poor Door Placement and Sizing

It’s easy to focus on vehicle doors, but don’t forget the importance of well-placed man doors and windows. A badly placed side door can make storage awkward, and undersized garage doors can limit your ability to upgrade vehicles.

Tip: Think through how you’ll move through the space on foot and by car. Consider wider garage doors (9' or 10' wide instead of 8') and extra headroom for taller vehicles or roof racks.

5. Skipping Thoughtful Design Upgrades

You only build a garage once - don’t miss the chance to make it truly work for your lifestyle. Skipping small upgrades like attic trusses for extra storage, a loft area, or adding windows for natural light can be a missed opportunity.

Tip: Explore garage plans that include optional upgrades, or consider customization. Many prefab plans can be tweaked to better suit your needs for a small additional cost.

Final Thoughts

Your garage is more than just a place to park the car - it's an extension of your home and lifestyle. By avoiding these five common mistakes and planning carefully from the start, you’ll end up with a garage that works hard for you now and in the future.

Need a head start? At Ontario Garage Plans, we offer permit-ready designs made specifically for Ontario homeowners - with customization options available. Browse our collection or get in touch for help choosing the right plan for your lot and lifestyle.