A good machinery shed is sized to your equipment line, not to a stock building plan. Too many machinery sheds get built to a standard footprint and then fail the first time a new combine or a bigger sprayer will not clear the door. Size from your biggest machine first, then plan a little further out than what you own right now.
Here is how to think through the size, the doors, and the floor before you call an estimator.
Size the building around your biggest machine, not a standard plan
Start with the single largest piece of equipment you own. A combine with the head attached is longer and taller than the combine alone, and it is usually the number that decides your door height. A sprayer with the booms folded still has real width and height to account for. Measure the tractor in its normal travel position, loader down, for the door, and plan separate interior clear height wherever the loader has to lift an attachment. A large combine with the head attached often needs somewhere around 13 to 14 feet of clearance at the door, and a raised loader or cab-height implement can need more room overhead where it lifts. A grain cart adds length you have to store somewhere too. Before you call an estimator, measure:
- Length and height with the head or attachment on, not off
- Width with booms folded for a sprayer
- Tractor height in its normal travel position, loader down, for the door
- Clear height needed wherever the loader must lift an attachment inside the building
- Length of your largest cart or trailer towed behind
Use your actual fleet, not catalog numbers. Then think about what you are likely to buy next. Farmers who size a shed exactly to what they own right now often find, a few seasons later, that the next combine will not clear the door they built. Plan the door and eave height with that next purchase in mind, even if you are not buying it yet.
Door strategy: endwall, sidewall, and how many bays
Wide endwall doors let you drive straight through a long building, nose to tail. That works well for a single row of large implements. Sidewall doors create separate bays, so each machine gets its own opening instead of parking behind another one. A sliding door moves along the wall and requires clear wall space beside the opening, and works fine for most equipment. A roll-up door takes less swing room and clears the opening faster. Some farmers leave one or more bays open-front, with no door at all, for equipment that does not need full weather protection or a quick in-and-out during harvest. Door height decides eave height, not the other way around. Whatever clears your tallest machine, with margin, sets the wall height for the whole building.
Clear span keeps posts out of your way
Northcraft engineers clear span buildings up to 100 feet wide with no interior columns. That matters more in a machinery shed than almost any other building type. A post in the wrong spot is a post you will eventually back a sprayer boom or an auger into. Plan your bay widths and aisle space around the equipment you actually park, not around where a column would otherwise have to go.
Open-front or fully enclosed
An open-front bay is faster to pull in and out of during harvest. It also leaves equipment exposed to blowing rain and snow, and to anyone driving by. A fully enclosed shed protects tools, batteries, and electronics, and gives you a lockable building instead of an open one. Plenty of operations do both: enclosed bays for the equipment and tools worth protecting, open-front for implements that live outside anyway.
Floor: gravel, concrete, or both
Gravel can work for straightforward equipment storage. Concrete gives you a clean, level surface that pays off if you plan any maintenance work in the building. An oil change, welding, or working under a machine is a different job on a clean, dry, level slab than in a puddle of mud. Some operations pour concrete only in a dedicated shop bay and leave the rest of the shed on gravel, which is a reasonable middle ground. See our guide to preparing a site for a steel building for what the ground itself needs before either option goes down.
Lighting and outlets
A shed used only for parking equipment can get by with basic lighting. A shed where you also do maintenance needs enough light to actually see what you are working on. Outlets belong where you will use a grinder, an impact wrench, or a battery charger, not just one by the door. Plan outlet locations around your shop bay specifically, not spread evenly across the whole footprint.
Snow, wind, and why the roof matters as much as the walls
A roof that fails under snow load does not just damage the building. It comes down on whatever is parked underneath it. Northcraft runs the actual engineering calculations for your specific site before any money changes hands, and provides real engineering figures rather than an estimate, so the roof over your equipment is designed for your real conditions, not a generic average. See our guide to snow load ratings for how that number actually gets set.
Position it where the farm actually works
Put the shed where equipment naturally travels between the field and the yard, not wherever there happens to be open ground. Drive-through access matters more than a short walk from the house. Grade the site so water runs away from the building and the apron in front of the doors, the same way you would for any other structure on the property.
How a machinery shed compares to a pole barn
If you are weighing wood pole-barn construction against steel, the tradeoffs are worth understanding before you commit either way. See our comparison of pole barns and steel buildings for the honest version of that comparison, and Northcraft's agricultural buildings page for how a machinery shed fits alongside barns, livestock housing, and hay storage on the same operation.
Frequently asked questions
How big should a machinery shed be?
Start with your largest machine's real length, width, and height, including any attachment left on it, then add the next piece of equipment you expect to buy. A shed sized exactly to your current fleet tends to run out of room within a few seasons.
What size door do I need for a combine?
A large combine with the head attached often needs somewhere around 13 to 14 feet of clearance. Measure your own combine in that configuration, since it is usually the longest and tallest one, and bring that real measurement, plus margin, to your estimator rather than assuming a standard door size will work.
Should a machinery shed have a concrete floor?
Not necessarily for every bay. Concrete is worth it wherever you plan to do maintenance work; gravel is fine for straightforward parking. Many operations mix the two in the same building.
Is an open-front shed enough for farm equipment?
It can be, depending on what you are storing and how exposed your site is to wind-driven weather. Open-front speeds up harvest-season access; fully enclosed protects tools, batteries, and anything worth locking up.
Can I add a shop bay to a machinery shed later?
It is far easier to plan a shop bay into the building from the start, with its own concrete, lighting, and outlets, than to retrofit one later. Tell your estimator up front if maintenance work is part of the plan.
Bring your real equipment measurements, including what you expect to buy next, and let an estimator engineer the shed around them. See Northcraft's machinery shed buildings for how these choices come together, or tell us your equipment and site and an estimator will run the numbers.