Post Frame Garages in Montana: Sizes, Styles, and Costs for 2026

Building a garage in Montana starts with a few key decisions: size, style, cost, and intended use. Will you use it only for parking, or also for storage, equipment, or a workshop?

A post-frame garage can be a basic, unheated building or a fully insulated shop with oversized doors, loft storage, and office space. The right design depends on what you need to store, your property’s layout, and Montana’s weather conditions.

This guide covers common garage sizes, styles, costs, and planning considerations.

The cost of a post-frame garage depends on its size, site conditions, concrete work, wall height, doors, insulation, utilities, engineering, and interior finishes. A basic storage garage costs considerably less than a heated workshop with plumbing, oversized doors, and finished rooms. The most accurate number comes from a quote for the actual property and intended use.

Garage Size	Square Footage	Common Use	Cost Treatment
24 × 30	720 sq. ft.	Two vehicles and light storage	Entry-level garage
30 × 40	1,200 sq. ft.	Vehicles, tools, and a small workshop	Popular mid-size option
36 × 48