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What size shed for riding lawn mower storage? For one 42 inch lawn tractor, the smallest that works is an 8×10 or 10×12 with an 84 inch door on the long wall. For room to walk around it plus garden gear, pick 12×12 or bigger. Whatever the size, the door should be at least 6 inches wider than the mower.
The door is the usual sticking point, then the space to get off the mower and walk past it.
How big is a riding lawn mower?
TractorData’s sheet for the John Deere S120, a common 42 inch lawn tractor, lists it at about 69.7 in long and 55.2 in wide with the deck. With the discharge deflector raised it is about 46.5 in wide. Measure your own machine: a 48 or 54 inch deck adds width fast.
The S120 covers about 27 sq ft of floor. Add a 2 ft strip on one side so you can step off and walk past, and one tractor uses roughly 40 sq ft before any shelves.
Zero-turn mowers are often about as long, and the deck housing is the widest part. A deck is wider than the cut size printed on it, so measure deck edge to deck edge, plus the discharge chute if it does not fold.
How to measure your mower for a shed
- Width. Measure the widest point with the deck on, once with the chute down and once with it folded up.
- Length. Measure from the front bumper to the back of the rear tires or hitch. Add a bagger, cart or snow blade if it stays on.
- Seated height. Sit on the mower and have someone measure from the ground to the top of your head.
- Deck clearance. Raise the deck to its top setting and measure from the ground to its lowest edge. If the deck scrapes where the ramp meets the sill, lengthen the ramp or bevel its top edge rather than making it steeper.
Then add room around it: at least 3 inches each side of the door for a careful driver, and 6 inches or more each side for easy parking.
What size shed for riding lawn mower doors: the width table
Many shed buying guides set a 48 inch wide, 72 inch tall door as the minimum. That is too narrow for a 42 inch tractor like the S120: 55.2 in wide with the deck on, and 46.5 in with the chute up, which leaves 1 1/2 in. Here is the S120 checked against door opening widths from our own plan pages:
| Door opening width | Spare, chute down (55.2 in) | Spare, chute up (46.5 in) | Verdict |
|---|---|---|---|
| 39 in single door | none | none | Will not fit |
| 60 in double door | about 4 3/4 in total | about 13 1/2 in total | Only with the chute folded up |
| 78 in double door | about 22 3/4 in total | about 31 1/2 in total | Comfortable |
| 84 in roll-up door | about 28 3/4 in total | about 37 1/2 in total | Comfortable |
| 108 in roll-up door | about 52 3/4 in total | about 61 1/2 in total | Easy; measure a wide zero-turn deck |
The width on a plan is the framed opening. Trim, door stops and a center post on some double doors take away an inch or more, so measure the finished clear width on your build.
Door height matters when you drive in seated. Our mower-width doors run from 72 to 84 inches tall. If the opening is lower than your seated head height plus a few inches, do not duck under the header. Get off and walk the mower in.
Floor plans that fit a lawn tractor
With 2×4 walls, a shed loses about 7 inches each way inside, so a 10×12 is roughly 9 ft 5 in by 11 ft 5 in. The same guides suggest 36 to 48 inches of clear depth beyond the mower so you can walk behind it. Here is how our plans measure up with the S120 parked nose-in.
Shallow sheds: 8×10 or 8×16 with a long-wall door. The 8×10 gable shed plan has an 84 inch roll-up door on the 10 ft wall. About 70 inches of mower in about 89 inches of depth leaves 19 inches behind it, with close to 5 ft of floor beside it for a trimmer or wall hooks. The 8×16 hip roof shed plan has the same depth with a 108 inch door and room for a second machine.
One tractor with a walkway: 10×12 with a long-wall door. The 10×12 hip roof shed plan is 12 ft wide and 10 ft deep with an 84 inch roll-up door on the 12 ft wall. That leaves about 3 1/2 ft behind the mower and close to 7 ft beside it for shelving.
Tractor, wheelbarrow, bikes and shelves: 12×12 or 10×16. The 12×12 gable shed plan (144 sq ft) has a 78 inch double door and about 5 1/2 ft of floor behind a parked tractor. The 10×16 hip roof shed plan (160 sq ft) has an 84 inch roll-up door on its 16 ft wall, with about 10 ft of wall beside the mower for bikes and racks.
Tractor plus a snow blower or a bench: 12×14 to 12×16. The 12×14 lean-to shed plan (168 sq ft) has an 84 inch wide, 72 inch tall roll-up door. The 12×16 gable shed plan with a double door (192 sq ft) has a 78 inch door and room for a bench at the back.
Against that 36 to 48 inch walk-behind check: the 8×10 and 8×16 fall short at 19 inches, the 10×12 hip and 10×16 hip meet it at about 43 inches, and the 12×12 clears it at about 67 inches.
Sizes that do not suit a lawn tractor: the 10×10 gable shed plan has a 39 inch single door. The 8×12 gable shed plan and our 10×12 gable have a 60 inch double door, so they suit a push mower, or a tractor only with its chute folded up.
Hinged, sliding or roll-up door?
- Double hinged doors give the full opening when both leaves are open. They need swing room outside: each leaf of a 78 inch pair sweeps about 39 inches, plus the ramp. Hook them open so wind cannot swing a leaf into the mower.
- Roll-up doors need no swing room and suit a long-wall door. The door coils above the opening, so the shed needs headroom over the header; follow the door maker’s install sheet. The bottom bar and handle hang a little below the framed opening when the door is up, so measure the clear height with the door open.
- Sliding barn doors need clear wall beside the opening, and the track and stops can trim the usable width. Measure the clear opening with the door fully open.
If you build your own hinged doors, our shed door guide covers framing a wide pair that stays square.
Floor and ramp: height, load and slope
A lawn tractor puts its weight on four small tire patches, and you will drive the same tracks every week. Our plans floor the shed with 3/4 inch tongue and groove plywood on floor joists over pressure-treated skids. If you change a plan, do not thin the plywood or space the joists farther apart. Keep a full-depth rim joist under the door and the plywood edge fully supported where the ramp meets it.
The floor sits above the ground. On our 10×12 gable plan, 4×4 skids, 2×6 floor joists and 3/4 inch plywood put the floor about 10 inches above the base. Blocks or a sloped site add more, so measure the real rise at the door once the shed stands.
A 10 inch rise over a 5 ft ramp climbs 2 inches per foot, about 9.5 degrees. Over a 7 ft ramp it climbs about 1.4 inches per foot. LSU AgCenter’s loading ramp safety advice says a longer ramp gives a lower, safer angle and many mowers need a low angle so they do not bottom out. Check your deck clearance against the crest where ramp meets sill, and your operator’s manual for the slope limit.
Build the ramp from pressure-treated lumber, wider than the outside of the rear tires plus a few inches each side. Support it on its own framing or solid blocking, not only on the sill, and keep the top edge flush with the floor. LSU also notes wooden ramps get slick when wet, so add a traction surface. Our shed foundation options guide shows how skids, blocks and gravel change the floor height.
Fuel and storage safety
Let the engine cool before you park it against shelves or close the door. Store gas only in a container made for fuel, follow the label, and keep it away from anything with a flame or spark, such as a heater. Vents high and low in the walls let fumes and moisture out; our shed ventilation guide covers vent sizes and placement.
Common mistakes with riding mower sheds
- Buying by floor area alone. A 10×12 with a 60 inch door has the floor for a tractor but not an easy doorway.
- Measuring the cut size, not the deck. A 42 inch deck is wider than 42 inches. Measure the housing and the chute.
- Forgetting the center post. Some double doors close against a post or fixed leaf that narrows the opening.
- No room to step off. If the mower fills the width, you climb over the steering wheel to get out.
- A short, steep ramp. It scrapes the deck and is hard to drive down safely when wet.
- Building right at a size limit. Floor area and height can decide whether a shed needs a permit. Check your local permit office before you settle on a size; our shed permit checklist lists what to ask.
What we checked: mower size from TractorData’s S120 sheet, ramp angle and traction from LSU AgCenter, and every plan door width, door height, shed depth and floor area from our own plan pages.
Plans that fit
Every 3DSHEDPLANS plan is a $19.99 PDF with a full material list, step-by-step 3D images and the door opening size, so you can check your mower against the real doorway before you buy lumber. For a lawn tractor, start with these:
- Smallest that works: the 8×10 gable shed plan, 80 sq ft with an 84 inch roll-up door on the long wall.
- One tractor with a walkway: the 10×12 hip roof shed plan, 120 sq ft with an 84 inch roll-up door.
- Tractor and garden gear: the 12×12 gable shed plan, 144 sq ft with a 78 inch double door, or the 10×16 hip roof shed plan, 160 sq ft with an 84 inch roll-up door.
- Tractor and more: the 12×14 lean-to shed plan, 168 sq ft with an 84 inch roll-up door.
- Two machines: the 8×16 hip roof shed plan, 128 sq ft with a 108 inch roll-up door on the long wall.
Browse every size on the shed plans page, the gable shed plans hub or the hip roof shed plans hub. To see the format before you buy, download the free 12×12 gable shed plan preview PDF. For storage beyond the mower, our guide to what size shed you need covers tools, bikes and workshops.
Frequently asked questions
Can a riding mower fit in an 8×10 shed?
Yes, if the door is on the long wall and wide enough. An 8×10 with an 84 inch roll-up door on the 10 ft wall takes a 42 inch lawn tractor nose-in across the 8 ft depth, with about 19 inches behind it. That is tight: no walkway behind the mower.
How wide should a shed door be for a riding mower?
Measure the mower at its widest point with the deck on, then add at least 6 inches. A 42 inch lawn tractor that is 55 inches wide needs a clear opening of about 61 inches or more, so a 72 to 84 inch door is the practical choice.
Is a 10×12 shed big enough for a riding mower?
The floor is, if the door is right. A 10×12 with an 84 inch door on the 12 ft wall leaves about 3 1/2 ft behind a 42 inch tractor. A 10×12 with a 60 inch double door only takes that tractor with the discharge chute folded up.
How tall does a shed door need to be for a riding mower?
Tall enough for the mower is easy, since lawn tractors stand well under 6 ft. Driving in seated is the real test: sit on the mower, measure to the top of your head and add a few inches. If the opening is lower, get off and walk the mower in.