Running out of room is a good problem to have. It usually means your business, farm or hobby is growing. When it happens, you face a choice: expand a metal building you already own, or build a separate new one.
Both options can work well. This guide walks through the questions that point you in the right direction.
Ways to Expand a Metal Building
Steel buildings suit additions well because the framing system is modular. Common options include:
- Adding bays by extending the building at one end wall
- Adding a lean-to along a sidewall for storage or covered work space
- Adding a connected building that ties in with a breezeway or shared wall
- Adding a mezzanine inside to use vertical space
When It Makes Sense to Expand a Metal Building
An addition is often the better choice when you want everything under one roof. For example, a growing shop may need a bigger bay right next to its existing work area. In addition, an addition can reuse an existing end wall, which saves material.
Expansion also works well when your lot is tight. Instead of finding room for a second building, you can grow the one you have.
When a New Building Is the Better Choice
Sometimes a separate building makes more sense. Consider building new when:
- The new space has a very different use, such as heated offices next to cold storage.
- Your existing building is near the end of its life or has structural issues.
- Snow drifting from a taller addition would overload a lower existing roof.
- Setbacks or zoning rules limit how far you can extend.
Check the Existing Structure First
Before you expand a metal building, an engineer should review the existing frame. An addition can change the loads on the original building, especially where roofs meet at different heights. As a result, the existing frame may need reinforcement.
Drifting snow is a big concern in New England. Our guide to metal building snow loads explains why drifts form where roofs meet.
Matching the Look and Performance
A good addition looks like it was always part of the building. To achieve that, match the panel profile, color, roof pitch and trim. In addition, plan insulation and vapor control so the new space performs as well as the old one.
Additions don’t always have to come from the original manufacturer. However, the new framing must tie in correctly with the existing structure.
How We Help You Expand a Metal Building
We design and install structural additions that integrate cleanly with existing buildings. We also coordinate closely with general contractors and project managers so nothing falls through the cracks. Learn more on our metal building additions page.
For background on steel building systems, see the Metal Building Manufacturers Association.
Talk to Maine Metal Buildings
Thinking about adding on? Send us photos, dimensions and your goals, and we will walk you through the best approach. Our team typically responds within 24 hours, and detailed quotes are usually ready within 7–10 business days. Contact us or call (207) 591-0196 to start your project.
