18x20 Portable Garages

An 18 x 20 ft garage is the double: two cars side by side, or a pickup beside a boat on its trailer, under one cover. The lead model in this size is the ShelterLogic ShelterTube, a rectangular-tube steel frame (2 x 3 in, 15-gauge) under a triple-layer waterproof cover, rated for a 35 lb per sq ft ground snow load, and for 80 mph winds at 10 ft tall or 70 mph at 12 ft. It has zippered doors at both ends, so you can drive straight through, and comes 10 ft or 12 ft tall in gray or green.

The 10 ft ShelterTube stands 9′10″ tall and the 12 ft one 11′10″, with an 18 ft wide door opening that reaches 108 in at its peak on the 12 ft model — room for a van or a boat on its trailer. The size also includes the ShelterCoat 18x20 peak garage (9 ft or 11 ft) and the Gazebo Penguin Deluxe Double Car Shelter with two windows. One car? See 12x20 garages; for a permanent roof, 20x20 carports and car shelters.

18x20 garage FAQ

Is 18 x 20 big enough for two cars?

Yes, for two cars or small SUVs parked side by side, or one vehicle plus a trailer, a snowblower and a workbench. Inside, the ShelterTube is 19′9″ wide by 18′1″ deep. Leave about 2 ft between the cars and the walls so the doors can open.

Is 20x18 the same as 18x20?

Yes, the same footprint named from a different side. ShelterLogic names the ShelterTube 20x18: 20 ft along the side walls and 18 ft across the ends, where the doors are, so two cars park nose-in through one end.

What is it rated for?

The ShelterTube is rated for a 35 psf ground snow load; the 10 ft model for 80 mph winds and the 12 ft model for 70 mph. Its frame carries a 10-year prorated warranty (full repair or replacement in year 1) and the cover 1 year. The ShelterCoat 18x20 states no rating, and its warranty is 1 year. Snow-load ratings explained shows what 35 psf means where you live; brush heavy snow off any fabric roof.

How is it anchored?

Anchor every leg: to concrete, to ground anchors in soil, or to a pony wall. The ShelterTube goes together with slip-fit joints and self-tapping screws, and our portable garage assembly guide covers the set-up. Check your bylaw first: many municipalities limit the size and season of a temporary shelter.

Guides for 18x20 Portable Garages

All guides

Snow Load Ratings Explained: What PSF Means for Canadian Carports & Garages

Snow load ratings are the most useful spec on a carport, portable garage or utility shelter — and the one buyers most often skim past. Here is what psf actually measures, which ratings really exist on the Canadian market, and how to match one to the winter your address gets.
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How to Set Up a ShelterLogic Portable Garage: Complete Assembly Guide

Complete step-by-step assembly guide for ShelterLogic portable garages. Covers ShelterCoat and ShelterTube models with tools needed, Canadian climate considerations, and the 7 most common mistakes to avoid.
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Best Outdoor Structures for Canadian Winters: Carports, Garages & Sheds

Need year-round vehicle and equipment protection in Canada? Compare steel carports, portable garages (ShelterTube vs ShelterCoat), and permanent steel buildings. Snow load ratings, climate zone recommendations, and sizing guides for every Canadian province.
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Winter Car Shelters in Canada: Sizing, Anchoring & Timing

The garage is full, the second vehicle sleeps outside and the forecast has started to mention flurries. Here is how to size a winter car shelter to your vehicle, read the cover specifications, anchor it on asphalt or gravel, and stay inside your municipality's seasonal window.
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Shed Foundations in Canada: Gravel Pad, Concrete Slab or Floor Frame Kit

Most steel sheds that fail early in Canada fail from the bottom up. This guide covers sizing the pad from the real foundation footprint, the four base types that work in a Canadian backyard, and the anchoring and snow-load details that keep a shed square.
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What Size Storage Shed Do You Need? 8x6 to 12x12 in Canada

An 8x6 shed is Canada's default size, but the door opening decides what actually fits inside. This guide compares the real interior dimensions, door widths, foundation pads and prices of steel sheds from 4x3 to 12x12, with snow-load and permit advice for Canadian yards.
10 min read