How to Choose the Right Fabric Storage Building Size — Decision Guide

Start With the Thing Going Inside

The #1 sizing mistake we see: people pick a size that fits the equipment they have today and are shocked when they outgrow it in 3 years. Measure what you'll store, then add 25% for circulation, 25% for future growth, and 1 header-width of clearance above the tallest item.

Example: Storing a Large Combine

A John Deere S790 with a 40' flex header is 15.5' wide (header off) × 40' long (header on) × 14'4" tall. Store header-on, you need a 20'×45'×16' interior minimum. That's a 40'×50' building rounded up to the nearest available size. Add a second bay for a tractor and you're looking at a 40'×80' or 40'×100'.

Example: RV & Boat Storage Business

Class A motorhomes max out at 13'6" tall, 8'6" wide, 45' long. You can fit 6 motorhomes side-by-side in a 60'×50' (nose-in parking) or 6 nose-to-tail in a 15'×270' (impractical). Realistically, 60'×100' with 12 bays nose-in is the sweet spot for a startup RV storage business.

Dimensions by Use Case — What Actually Fits

30'×40' — Small Acreage & Hobby Use

• 2 full-size trucks + 1 tractor OR
• 1 RV (Class C) + workshop space OR
• 10–12 round hay bales (5'×6') stacked 2 high

Ceiling height: 14'–16'. Adequate for most residential equipment; tight for anything commercial.

40'×60' — Small Commercial / Mid-Size Farm

• 4–5 equipment bays OR
• 2 RVs + a boat + a truck OR
• 40 round hay bales stacked 2 high OR
• Small contractor's yard (6 work trucks + materials staging)

Ceiling height: 16'–18'. The most popular size for mid-size Alberta grain farms.

40'×80' — Our Best-Seller

• Full combine with header on + supporting equipment OR
• 6–8 RVs/boats in a commercial storage operation OR
• 80 round hay bales OR
• Seed processing operation (batch layout) OR
• Industrial cold storage for construction/landscape materials

Ceiling height: 18'–20' peak. This is the Goldilocks size — big enough for most serious operations, small enough to be permit-light.

50'×100' — Commercial Ag & Light Industrial

• Drive-thru combine shop with header on + maintenance bay OR
• 12 RV/boat storage bays OR
• Hay shed for 120+ round bales OR
• Industrial salt/aggregate storage

Ceiling height: 22'–24' peak. Requires full building permit in most jurisdictions.

60'×120' & Up — Commercial Operations

• Feedlot operations (300+ head capacity)
• Large seed-cleaning plants
• Commercial RV storage (18+ units)
• Municipal salt/aggregate storage for smaller towns

Ceiling height: 26'+. These are permit-heavy and sometimes require zoning review.

The "Door Width" Trap

A 40'-wide building has a 40'-wide interior but typically only a 14'–16' wide door. That's fine for most farm equipment but tight for:

• Flex headers wider than 14' (needs to go on separately)
• Motorhomes with slide-outs deployed
• Dual-lane contractor use (can't pass two trucks at the door)

Solution: order a wider door ($1,200–$1,800 upcharge on a 40'-wide), or buy the next size up where the standard door is already wider. The 50'-wide buildings have 20' standard doors.

Door Position

End doors are standard. Side doors are available at upcharge but structurally weaker — the side of a fabric building is the pressure zone during wind events. For RV storage, end doors are always the right answer.

Height — The Forgotten Dimension

Our standard sizes have the following peak heights:

• 30'-wide: 14'–16'
• 40'-wide: 18'–20'
• 50'-wide: 22'–24'
• 60'-wide: 26'–28'
• 70'-wide: 30'+

Interior clearance at the sidewall is typically 8'–10' lower than peak height. A 40'-wide building with 20' peak height has ~10'–12' of sidewall height. That matters for:

• Mezzanine builds — impossible under 8' sidewall
• Overhead crane installation — typical crane needs 14' clear, impossible in the 30'- and 40'-wide sizes
• Double-stack hay storage — requires 20'+ peak
• Large equipment with pop-up attachments (grain augers, etc.)

When to Buy Bigger Than You Need

Common scenarios where we tell customers to buy the next size up:

• Farms planning to expand. The marginal cost of going from 40'×60' to 40'×80' is roughly $2,000. The cost to buy a second 40'×60' later is a full second building. One-time upsize saves money.
• Any commercial storage business. Rent-by-stall math rewards larger buildings — higher throughput, same fixed costs.
• Cold-climate grain storage. Extra airflow = better drying. A 50'×100' breathes better than a 40'×80' full of damp grain.
• Construction contractors. Material storage needs and equipment storage needs grow together.

When to Stay Smaller

• Urban acreage with setback restrictions. Sometimes you physically can't fit the bigger building.
• Residential permit simplicity. Under 7,500 sq ft keeps you in simpler permit categories in most Alberta municipalities.
• Operating budget. A 40'×60' delivered is $10,888 CAD. A 50'×100' is $14,888. If the extra $4K breaks the budget, take the smaller building and plan to buy a second one in 3 years.

Our Actual Best-Sellers By Use Case

• Mid-size grain farms (2,000–5,000 acres): 40'×80', 50'×100'
• Large grain farms (5,000+ acres): 60'×120', 70'×150'
• Cattle operations (<200 head): 40'×80', 40'×100'
• Feedlot operations: 60'×120', 70'×200'
• RV/boat storage startups: 50'×100', 60'×100'
• Large RV storage businesses: 70'×150', 70'×200'
• Oil-and-gas service shops: 40'×80', 50'×100'
• Acreage equipment storage: 30'×60', 40'×60'
• Home-based contractor yards: 40'×80'