Quonset Hut Guide for Ontario Buyers

By Paul LeBlanc, owner, and Christian LeBlanc, second-generation operator, Van Blanc Ent. Inc.

Reading Time: 20 minutes

What’s a Quonset Hut?

A quonset hut is a building whose walls and roof are the same part. A run of corrugated, galvanized steel arches is bolted together rib by rib until the row becomes a hall. There is no frame inside and no column anywhere, which is the format’s signature trick. The whole interior, wall to wall and floor to peak, is usable clear span. People often spell it quanset or quansit, and the building is the same whichever way it’s typed.

Before we go further, a disclosure: Van Blanc sells shipping containers, not quonset kits. The LeBlanc family has supplied steel boxes to Ontario farms and yards since 1995, from our 4 Brantford yards. A quonset suits wide machinery, hay and any job that needs clear span; lockable storage that fits inside a 40-foot box suits a container. Paul LeBlanc owns the business, and Christian LeBlanc was raised in the container trade.

The two formats solve neighbouring problems, which is why we think a plain quonset guide belongs on the Van Blanc site. The head-to-head argument lives on a separate page, so this one can stay a buyer’s guide to the arch. The same disclosure sits on our Sprung Structures review, the fabric clear-span cousin of the arch.

Quonset Hut History: Quonset Point, 1941

The name is a place. In 1941 a team of engineers at Quonset Point Naval Air Station in Rhode Island designed the building that took the base’s name. That account comes from the Washington State Department of Archaeology and Historic Preservation’s style guide to the quonset hut. Future Buildings, an arch seller based in Markham, Ontario, credits the George Fuller Construction Company with making the first one for the US Navy. Fuller worked from the Nissen hut design that was common in the First World War.

The wartime numbers explain why the shape is still everywhere. The Washington State guide records that a team of ten could put up a typical twenty-foot hut in one day. By the end of the Second World War, an estimated 150,000 had been built around the world. Two standard sizes did most of the work. The Quonset 20 measured 20 by 48 feet (6.1 by 14.6 m), and the 40, nicknamed the Elephant Hut, measured 40 by 100 feet (12.2 by 30.5 m). The Quonset 20 enclosed 960 square feet. The same guide notes that a good part of it was unusable because of the sloping sides, still the first complaint about a semicircular arch today.

The huts were designed for 86 official uses, and after the war the shape moved into civilian life and the wider steel building trade. Stran-Steel issued a press release in late 1946 that listed 257 adaptations. The kits sold across Canada now descend from that design, and they still arrive stacked on pallets. The buyer’s job has barely changed: pour something honest to stand it on, bolt the arches in order, and close the ends. One Ontario dealer that sells Q, S and Alpine models gets a full page in our read on Metal Pro Buildings, which explains who actually rolls the steel.

Quonset Hut Models: Q, S, P and A

Canadian quonset sellers quote by model letter, and the letters describe the arch profile. The differences decide your usable width, your wall clearance, and how the building sheds weather, so they are worth two minutes of attention.

Every maker brands these differently (one company’s Alpine is another’s P model), but the profile taxonomy underneath is stable, and it maps to buyers cleanly. Grain, hay and machinery live happily under a Q, where the curved wall is irrelevant to a pile. The sealed-steel side of the same farm yard is covered in the farm storage guide. A mechanic’s bay wants the S, because a hoist and a workbench both want vertical wall behind them. The peaked models earn their premium in the snow belts, where shedding snow is worth more than any other feature on the sheet. One of the largest Canadian sellers of the Q and S profiles is covered in our Toro Steel Buildings review. One Ontario seller’s version of that taxonomy, its Q, S, P and A models, is read model by model in the Future Buildings arch review.

The spec sheet is where makers differ, and a few published figures show what a serious one contains. The table below takes each number from the maker’s own page. Treat it as a checklist of questions to ask any supplier, including the ones named in it.

Gauge talk follows the same rule we gave in our carport guide: smaller number, thicker steel. A seller who cannot quote the panel gauge for your exact model and span is reading their own brochure. Canadian steel building makers can be certified under CSA A660-10. CWB Group, which audits plants against it, says the standard covers the maker’s whole process, from design and engineering through fabrication, shipping and erection documentation. Ask whether the quote is A660-certified steel with stamped engineering for your snow district. No other question sorts serious suppliers from importers as fast. For arches beside rigid frames and post-frame barns, Van Blanc keeps a guide to the wider steel building market in Ontario.

Quonset Hut Cost: What Moves the Quote

We don’t sell quonsets, so this guide carries no quonset prices; our posted prices cover the 20ft and 40ft boxes among the container sizes we stock and sit on a separate container price page. What we can lay out is what moves a quonset quote in Canada, using the non-price figures makers and cost guides publish. BuildingsGuide’s 2026 cost guide puts the arch’s low cost down to having no heavy beams and to erection with 40-50% less labour. The rest of the quote is built from these lines.

For a Canadian buyer, two of those lines carry more weight than they do in a US cost guide. Snow district engineering decides the gauge, so the same span can quote differently in Chatham and in Bracebridge. Freight depends on whether the kit is made in Ontario or crosses the border, so ask where the plant is before comparing totals. (Freight is a house obsession here too; our delivery logistics hub is the container version.)

The Endwall Surprise

The arch kit and the endwalls are usually separate line items, and the arch price is the one on the banner. Read the banner price as the arch alone.

An arch run with no ends is a tunnel. To make it a building you buy or build two endwalls, and every choice there is real money. The options are steel endwall panels from the maker, framed-and-clad ends built by your carpenter, or one steel end with an open face for a drive-through hay shelter. Then the doors go in the endwall, and door hardware is its own market: a machinery-width roll-up or sliding door, a man door, maybe a window or two. By the time the tunnel has become a shop, the ends-and-doors bundle can rival the arch kit itself. Good sellers say so up front.

Quonset Hut Foundations in Ontario

A quonset hut needs a foundation. The arch pushes outward along its whole length, so it doesn’t sit on the ground so much as grip it. That grip is the foundation’s job, and there are three workable ways to provide it.

A full concrete slab with a thickened perimeter is the default for shops and garages, since one pour gives you the floor and the anchorage. In Ontario’s freeze-thaw climate, the perimeter goes below frost or the slab is detailed as a frost-protected shallow foundation. The grade-beam or pier approach anchors the arch feet on concrete runs along the two long sides. The floor stays packed gravel, a legitimate saving for hay, grain and equipment storage where concrete buys nothing. A third route bolts base plates to an existing slab, for buyers roofing over an old yard pad. Someone competent has to confirm the old concrete can take the arch thrust.

All three are engineered work, and the foundation is almost never in the kit price. It is also the part of the project most sensitive to your actual site. Sand plain in Norfolk, clay in Haldimand and shield-edge gravel near the Kawarthas are three different excavation and drainage conversations under the identical arch. Van Blanc’s own pad and ground primer walks the same soils from the container side. Budget the ground before the steel. On paperwork, one sentence covers it: permits are managed by your municipality, so check with your local building or planning department before you order.

Winter Snow and Condensation

Ask a quonset owner about February and you will hear about two kinds of water: the kind on the roof and the kind on the ceiling.

Snow first, because the news is good. The arch is among the best snow geometries in building: loads travel down the curve into the foundation, and the steeper models shed before depth builds up. Reputable Canadian makers engineer each order to the buyer’s district and will show stamped numbers for your ground snow value. Insist the engineering matches your district, and treat any kit sold without stamped numbers as the tent it legally is.

Condensation is the quieter enemy. Put a bare steel shell over warm, breathing contents (livestock, curing firewood, a heated shop, a tractor parked wet) and it will sweat on the first cold night. By morning it drips on everything below. Van Blanc answers the same question about containers, and why bare steel sweats on a cold night is the same physics under an arch. The fix is the trio the container world uses. Size the ventilation to the use. Insulate where the interior will be conditioned (closed-cell spray foam bonds well to the corrugation and kills the cold face). And keep wet machinery and green firewood in moving air. (The container version is written up in our ventilation guide.) Owners who skip all three get a rain cloud with a door.

Quonset Hut DIY Assembly: Crew and Days

Quonset kits are self-assembly, and that matters: it is why the format’s cost per enclosed square foot undercuts most alternatives at machinery scale. BuildingsGuide tells buyers to expect a professional crew to erect a 30 by 40 foot building in 2-4 days. A 40 by 60 takes about 4-6 days, and a first-time DIY crew should roughly double both.

Each arch rib is assembled flat from curved panel sections, then raised and bolted to the previous rib. The work is repetitive more than complicated. A building takes hundreds of bolts, torqued consistently, and the first three ribs decide whether the next thirty go up straight. Two or three people with basic lifting help is the realistic shape of a garage-sized build, and farm crews with a telehandler move much faster. Wind is the enemy of a half-built arch row, so raising happens in calm weather with bracing taken seriously. The labour is real and it is yours. Pricing a local crew for the raising is a sensible middle path plenty of Ontario buyers take. On the container side, a tilt-deck drop is the whole assembly. Write both labour lines on the same sheet before choosing.

Heating and Insulating an Arch

An uninsulated quonset is a magnificent cold building, and for most of its classic jobs, cold is fine. Machinery does not shiver, and hay prefers airflow to warmth. Insulation on a pure storage building is money the contents will never thank you for. So the first question is whether the building should be conditioned at all, and for many Ontario arches the answer is no, plus good ventilation.

When the answer is yes (the hoist bay, the workshop, the winter project space), the arch needs a different insulation logic than a framed building. There are no stud cavities to fill. Closed-cell spray foam on the inside face is the usual choice, since it bonds to the corrugation, adds stiffness and kills the condensation face. Natural Resources Canada’s Keeping the Heat In guide lists closed-cell polyurethane foam at R-5.2 to R-6.5 per inch. Its design value is roughly R-6 per inch. Over the long term, NRCan says the value should be limited to RSI 0.90 per 25 mm, because the foam loses blowing gas. At NRCan’s long-term figure of RSI 0.90 per 25 mm (about R-5.1 per inch), a two-inch pass works out near R-10 and three inches near R-15.

Blanket systems are glass fibre with a reinforced facing, hung on pins. The same NRCan table rates glass fibre at R-3.1 to R-4.3 per inch, and blankets need careful detailing at every rib to avoid loose, saggy runs. Either way, thermal bridging at the ribs is the weak point. Rigid board with strapping suits flat endwalls far better than curved arch faces. The same R-values apply to the insulated containers Van Blanc converts in our Brantford yards.

The floor matters as much as the shell. An uninsulated slab drains heat all winter. Buyers pouring new concrete for a heated arch should price under-slab foam and in-floor heating lines while the pour is cheap, because retrofitting either is not. Heating equipment then follows the building’s duty cycle. A shop used evenings and weekends wants fast-recovery heat, such as overhead radiant tube or a good unit heater. A building used every day can justify the in-floor investment. The volume under an arch is generous, which is wonderful for hoists and hard on heating bills, and radiant heat that warms objects suits the shape.

New, Used and Surplus Arches

Because the format has been in continuous production since the war, the arch market runs three tiers deep, and each tier has its own rules.

New certified kits are the straightforward tier: current-gauge steel, stamped engineering matched to your district, warranty paper, and the freight quoted from a known plant. For a building you intend to heat, insure or work under daily, it is the tier to buy.

The used market is real and worth respect, with eyes open. Whole arches come up for sale when farms consolidate or yards get cleared. A disassembled arch is, mechanically, a pile of numbered panels and a bolt count. The buyer’s checklist is short but unforgiving. Start with galvanizing condition: white storage stain is cosmetic, red rust through the coating is not. Then check the straightness of the base channel and the completeness of the hardware. Above all, ask the engineering question. A 1980s arch was stamped, if at all, for a different code era and possibly a different province. Re-erecting a used arch without an engineer’s review puts an unknown roof over known machinery. The steel checks overlap with a rust and corrosion checklist for a used container.

Actual military surplus is mostly a collector’s market in Canada now. Genuine wartime huts surface occasionally with heritage patina, and buyers love them for event spaces and shop character. Treat them as restoration projects with building-shaped outcomes; the cheap-square-footage crown belongs to the modern kit.

Are There Quonset Huts in Ontario?

Yes, plenty of them, and Ontario also has its own arch sellers. Future Buildings lists its address in Markham, and Metal Pro Buildings lists an office in Thornhill. Drive the province and the quonset population is not evenly spread, because the format follows specific working histories.

The heaviest belt is the southwest’s cash-crop and former tobacco country. Norfolk and the sand-plain townships turned tobacco infrastructure over to grains, ginseng and greenhouse operations. The arch was a natural machinery answer there: wide, affordable, and indifferent to curved walls because a grain pile has no shelving. Many of those arches have outlived the crop cycles that justified them, which is the format’s sales pitch visible from the road.

The second population tracks the hobby-farm and rural-shop wave within an hour of the cities. Think S-model garages and hoist bays on severed lots from Wellington down through Brant, where the arch competes with other prefab garage kits. The buyers have exactly the build-it-yourself temperament the kit format rewards. The third population is northern and institutional. Townships, contractors and camps put peaked arches over sand, salt and equipment, because the shape handles lake-effect snow and a palletized kit trucks north easily.

If your project rhymes with one of those stories, neighbours you can go look at have already proven the format on your ground. Looking at a local, decades-old arch before buying is diligence no brochure replaces. Van Blanc gives the same advice about containers: go see one that has lived through a few winters.

Quonset Hut Disadvantages

Every building format has trade-offs, and the arch’s are well known to the people who own one. None of them is a reason to avoid a quonset; each is a line to plan for.

Weigh those against what the arch does well. For wide storage the list is short and manageable. For a small, lockable tool store it is long enough to point at a different format, which the next two sections cover. Van Blanc also has a guide to a post-frame pole barn in Ontario, and a page on other drive shed options.

Where a Quonset Fits

Van Blanc sells the other format, so read this list as a concession from a container yard.

If that list is your project, buy the quonset, buy it certified, and put the saved money into the endwalls and the slab. The comparison shopping worth doing from there is between arch suppliers. Compare plant location for freight, A660 certification, stamped engineering for your district, endwall pricing, and the gauge on your exact span. Van Blanc has no stake in which arch supplier you pick.

The Other Steel Answer on the Same Farm

Now the part we know from the inside, disclosed and kept in its lane. On the same properties that quonsets serve, a different steel format keeps arriving on our trucks. The sorting between them is clean once the specs sit side by side.

A quonset is enclosed space you assemble: wide, permanent, and priced per square foot of span. A shipping container is enclosed security you drop: sealed, floored, lockable, moveable, and working the moment the truck leaves. The overlap is smaller than it looks. Nobody stores a combine in a sea can, and nobody should bolt together a forty-foot arch to lock up tools, seed and a quad. The two formats co-exist happily in the working yard that uses both. The arch covers the machinery and the hay, and a 20-foot or 40-foot container beside it holds everything that walks away. That means parts, chemicals, tools and the season’s valuables, behind a lockbox. Lockbox and lock choices are their own short science. The container figures above come from the 40ft high cube spec sheet Van Blanc publishes for the units in our rows.

The full head-to-head lives in our container versus quonset comparison, span for span and cost driver for cost driver. The fabric-covered cousin of the arch gets the same treatment in our fabric structure piece. The one buyer we will actively redirect: if your whole project is secure storage under 320 square feet, price sealed steel before you price any kit. A wind and watertight container needs no foundation pour, no assembly weekends and no endwalls. It also holds resale value as a moveable asset. For that buyer the arch is the wrong tool bought for the right instinct, and good sellers on both sides say so.

Sizing the Arch for Year Five

The last trap in quonset buying is sizing by the contents you own instead of the contents you are about to own. Van Blanc warns container buyers about the same trap. Farm equipment grows, and so does everything else that lives indoors once indoors exists. These rules of thumb hold up in real yards. Measuring the fleet before choosing any span, arch or box, is the first step in sizing a machine shed around the tractors.

See Sealed Steel Beside the Arch

Van Blanc has been selling steel boxes to Ontario buyers since 1995. If your project turned out to need sealed steel beside the arch, or in place of it, 90 Morton Avenue East is where you can put hands on every grade we sell.

Van Blanc Ent. Inc., 90 Morton Ave E Unit 1B, Brantford, ON N3R 7J7, 519-754-6844

Bring your machinery list and your site sketch. Sorting arch jobs from container jobs is a short conversation.

Related Reading

• Container vs Quonset Hut in Ontario
• Container vs Fabric Structure
• Farm Storage in Shipping Containers
• Carports in Ontario: The Honest Buyer’s Guide