Building Types
80x100 Agricultural Steel Building
- Width
- 80 ft
- Length
- 100 ft
- Floor area
- 8,000 sq ft
- Perimeter
- 360 ft
Use
How a 80×100 Agricultural Building May Be Used
Equipment storage
Machinery clearance height and door width are usually the limiting factors, not floor area.
Hay storage
Bulk storage depth against the sidewalls affects how the building is loaded and unloaded.
Livestock shelter
End-to-end access lets equipment pass through without reversing.
Example
Example Configuration
Quick dimensions
At a Glance
Width
80 ft across the gable end.
Length
100 ft along the sidewall.
Floor area
8,000 sq ft of clear floor.
Eave height
20 ft at the sidewall on the stored profile.
Configuration
How This Building Is Configured
Steel structures for equipment, hay, livestock and general farm storage.
Configuration summary
| Building type | Agricultural Building |
|---|---|
| Footprint | 80 ft × 100 ft |
| Floor area | 8,000 sq ft |
| Eave height | 20 ft |
Planning
Footprint & Space Planning
Footprint
Width and length are chosen together: width is usually fixed by what has to fit side by side, length by how many bays are needed.
Height
Eave height affects door options, storage height and how open the interior feels.
Access
Where vehicles and people enter changes the whole interior layout, so access is settled before anything else.
Doors and openings
Opening width, height and position are specified with the supplier; they affect the frame and the wall bracing.
Site
Slope, drainage, access for delivery and erection, and the foundation are confirmed for the actual property.
Expansion
Extending along the length is usually simpler than changing the width later, which is worth deciding up front.
Access
Doors & Access Considerations
Opening width
Across a 80 ft gable end, the practical opening width is limited by the frame and confirmed with the supplier.
Opening height
A 20 ft eave sets the ceiling on door height before any frame change.
Drive-through
Matching openings at both ends avoid reversing, at the cost of usable wall.
Similar sizes
Other Sizes for a Agricultural Building
80′ × 80′
6,400 sq ft
80′ × 120′
9,600 sq ft
70′ × 100′
7,000 sq ft
Related
Related Building Types
Example configuration — for planning purposes only.
FAQ
Common Questions
80 ft × 100 ft is 8,000 square feet of floor area before any interior partitions.
Length is usually adjusted in bay increments, and width is a larger design change. Both are confirmed with the supplier for the final design.
Site preparation, foundation and erection are commonly quoted separately from the building package. Confirm the scope of any quote you receive.
Compare nearby sizes
Related footprints for this building type
Each page works through one footprint for one building type.
Cost drivers
Quantities that move the estimate at 80x100
Quantities, not prices, are publishable here: roof cladding runs 8,433 square feet — 5% above the 8,000-square-foot floor at a 4:12 pitch — with 148.1 cubic yards of nominal slab beneath it. The mezzanine that is added afterwards is the change order that reprices the frame.
Proportion drives cost here as much as size does: 360 ft of wall around 8,000 sq ft is 0.045 ft of wall per enclosed square foot, and a squarer plan of the same area would carry less. What moves the figure further on a wide-span equipment floor is the fit-out wide span farm buildings implies, along with framed openings and the height chosen for the 80 ft span.
- the clear width the widest fully assembled implement needs
- whether the floor is left as dirt or gravel, partly concreted for the working end, or fully slabbed
- how many bays stay open for machinery and how many are enclosed for inputs
- the apron and yard surface machinery turns on
- interior partitioning between feed, tool and machinery zones
Overview
A 80x100 agricultural building planned as wide-span equipment floor
This page is ordered around height and clearance, because at 80x100 the 20-foot eave limits a agricultural building sooner than the plan does.
4 wide equipment positions fit across the 80-foot width with only 0 feet left over, which is a tight fit: the width is fully committed and nothing can be widened later without moving a wall.
Efficiency is the useful number here: 667 square feet of enclosed floor per wide equipment position, against a 520-square-foot module. That leaves working slack around each position. Temperature swing on a steel shell drives condensation decisions that outrank most layout preferences.
A 80 by 100 footprint is a mildly directional plan: 8,000 sq ft enclosed by 360 ft of wall, at a 1.3:1 length-to-width proportion. Along its 100 ft dimension it takes 3 runs of wide equipment positions at 26 ft, leaving 22 ft over — the 22 ft is where the argument about this size actually happens. A footprint that is wide relative to its depth is answering a different question from a long one. Width buys parallel positions and internal turning; it does not buy depth of run. Planned as a wide floor, this building lets several machines stand side by side and each leave without disturbing the others. Frost, thaw and heavy tires work on the apron before they work on the floor, and the apron is usually the weaker of the two.
This footprint is planned as wide-span equipment floor. Spent as a square 89 by 89 instead, the same 8,000 sq ft would stand 3 wide equipment positions across rather than 3, and would trade this plan's length for parallel access. That is the width-against-depth decision this footprint has already made. Compared with a 80 by 80 of the same width, the extra depth here adds run rather than reach: it buys about 3 wide equipment positions in line, and every position past the second is retrieved by moving what stands in front of it. A building of this size behaves like a small yard under a roof: zones need to be defined, signed and left alone, or they migrate. The longest internal travel on a 80 by 100 plan is about 128 ft corner to corner, and the shortest useful one is the 80 ft cross-run. For a wide-span equipment floor that matters where wide span farm buildings sits, because shortening the 80 ft run to serve it lengthens every trip along the 100 ft dimension. Whatever the plan says, a farm building accumulates a second use within a year or two, and the plan that survives leaves room for it.
Read this page as a use page, not a construction page. Agricultural building is a use category on this platform, not a construction method: it covers farm buildings by what they hold and how the operation runs, and the same use can be built as a clear-span steel frame, a post-frame building or another system. The question it answers is how useful a 80x100 footprint is for this use.
Areas, perimeter, roof area, ridge height, slab volume and the wide equipment position counts on this page are computed from the stored 80x100 record and this platform's planning module for the agricultural building category.
Height
Interior height for a 80x100 agricultural building
Across a 80-foot span the 4:12 pitch adds 13.3 feet between eave and ridge. The centreline measures 33.3 feet; anything parked or stacked near a wall lives with the 20-foot eave. Snow, wind and site exposure change what this shape costs to build long before the interior plan does.
Height on a 80 ft span is a separate decision from the 100 ft length, and it is the span that sets the frame's behavior. Raising the eave over 8,000 sq ft affects every bay along the 100 ft dimension, so the test is whether wide span farm buildings genuinely needs the extra clear height or only the floor area.
Ventilation across 8,000 square feet at this height: farm storage brings moisture in with it: green hay, wet machinery and any animals all release it, so ridge-to-eave airflow is a planning priority and a tightly sealed building is usually the wrong instinct here.
Clear height below purlins, bracing and lighting is lower than the eave height. The usable figure comes from the manufacturer's framing for the selected building.
Usable area
How the 8,000 square feet divides at 80x100
Computed wide equipment position fit for a 80x100 agricultural building
| Measure | Computed at this footprint |
|---|---|
| Wide equipment positions across the 80-foot width | 4 at a 20-foot module |
| Leftover width | 0 ft (0 sq ft as a full-length strip) |
| Rows along the 100-foot length | 3 at a 26-foot module after 16 ft of circulation |
| Leftover depth | 6 ft (480 sq ft across the width) |
| Total wide equipment positions | 12 |
| Share of floor committed | 78% |
Module footprint used here is 20 by 26 feet, this platform's planning module for a agricultural building. It is not a code minimum or an engineered clearance.
Example allocation of the 100-foot length — planning model, not survey data
| Zone | Length along the building | Computed area |
|---|---|---|
| Equipment bays | 60 ft | 4,800 sq ft |
| Material and input storage | 25 ft | 2,000 sq ft |
| Working and turning space | 15 ft | 1,200 sq ft |
Shares applied to the stored 100-foot length; areas computed against the 80-foot width.
Module footprints and allocation shares come from this platform's use typology and are published as example planning models. They are not recommendations and do not describe a majority of projects.
Allocation
Dividing the floor for wide-span equipment floor
The second use this farm footprint tends to absorb is mixed farm utility: the leftover is the buffer that keeps two competing uses from touching, which is a use in itself. Dividing the 8,000 sq ft by the 20 by 26 ft wide equipment position gives roughly 9 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 9 or drops to 6 comes back to the question this footprint is really answering: what does the extra width buy that extra length could not have bought instead?
There is no end zone at this footprint. 6 feet is circulation slack, not floor area with a purpose, and the leftover across the width is what allows a machine to turn inside rather than reverse the full depth. The count of working positions, not the headline area, is the figure that survives contact with the operation.
Width is fully committed at 80x100. With 0 feet spare, wall storage and passing room compete with the wide equipment positions directly. Access, not area, is what makes a plan feel small once it is in use.
Spent as a square 89 by 89 instead, the same 8,000 sq ft would stand 3 wide equipment positions across rather than 3, and would trade this plan's length for parallel access. That is the width-against-depth decision this footprint has already made. Compared with a 80 by 80 of the same width, the extra depth here adds run rather than reach: it buys about 3 wide equipment positions in line, and every position past the second is retrieved by moving what stands in front of it. A building of this size behaves like a small yard under a roof: zones need to be defined, signed and left alone, or they migrate. The longest internal travel on a 80 by 100 plan is about 128 ft corner to corner, and the shortest useful one is the 80 ft cross-run. For a wide-span equipment floor that matters where wide span farm buildings sits, because shortening the 80 ft run to serve it lengthens every trip along the 100 ft dimension. Whatever the plan says, a farm building accumulates a second use within a year or two, and the plan that survives leaves room for it. That movement pattern, not the 8,000-square-foot total, is what decides whether the leftover 6 feet is useful here.
Openings
Openings for 4 wide equipment positions across
At 80 feet the gable will not comfortably take one opening per wide equipment position: 4 positions with 0 feet spare leaves too little wall for piers. A single wider opening, or a sidewall opening, is the workable route. Fire separation, egress and occupancy are determined for the specific building and can reshape this plan entirely.
A wide wall can carry several openings without them competing, and that is the natural place for them: one opening per pair of positions removes most of the internal maneuvering.
Loading is done by machine from the apron, so the surface outside the door does as much work as the floor inside.
Framed-opening sizes, headers and the structure around them are engineered for the specific building. Confirm every opening with the door supplier and the building manufacturer before ordering.
Configurations
Configuring 12 wide equipment positions at 80x100
At 25-foot nominal bays the structure works with the layout instead of against it: one wide equipment position per bay line, walls free of awkward half-positions. Set the openings before the interior, because the openings cannot move and the interior can.
Two-plus rows change the access question entirely. Every rear position at 80x100 needs either its own opening or an aisle, and 0 feet of spare width is what that aisle has to come from. Where the building sits on the site changes how much of this floor is genuinely reachable.
A wide building is extended along its shorter dimension, which repeats the expensive span rather than the cheap one — worth knowing before the first phase is fixed.
Configured as wide-span equipment floor, 80x100 is judged on whether the 12 wide equipment positions it holds match the operation, and on whether the 0 feet of spare width leaves the route this mode depends on.
- Does the work need racking or work zones on both sides with a full vehicle lane down the middle, or does it need a second lane that this 80-foot span cannot give?
- Is the 100-foot length being bought for depth, or for the repeated bays — eight to ten repeated bays, which makes the layout a scheduling problem as much as a spatial one?
- What is the widest implement that has to come in fully assembled, and does it ever come in with an operator in a hurry?
- Does the building need a drive-through route, or is single-end access acceptable?
Bay division shown here is a planning module computed from the stored length. Actual bay spacing is set by the manufacturer's frame design for the building.
Comparison
What changes at adjacent footprints
Computed comparison of nearby footprints for a agricultural building
| Footprint | Floor area | Wide equipment positions |
|---|---|---|
| 40x80 | 3,200 sq ft | 4 (2 x 2) |
| 60x60 | 3,600 sq ft | 6 (3 x 2) |
| 50x80 | 4,000 sq ft | 9 (3 x 3) |
| 40x100 | 4,000 sq ft | 4 (2 x 2) |
| 60x80 | 4,800 sq ft | 4 (2 x 2) |
Areas computed from each stored size record; wide equipment position counts computed with the same 20 by 26 foot planning module.
- 40x80 moves the count from 12 to 4 wide equipment positions (2 across by 2 deep), which is the reason to choose between them.
- 60x60 moves the count from 12 to 6 wide equipment positions (3 across by 2 deep), which is the reason to choose between them.
- 50x80 moves the count from 12 to 9 wide equipment positions (3 across by 3 deep), which is the reason to choose between them.
Nearby footprints read for a agricultural building: exact change in area and in planning wide equipment positions
| Footprint | Area Δ | % Δ | Wide equipment positions at that footprint | What changes for this use |
|---|---|---|---|---|
| 50x150 | −500 sq ft | −6.2% | 9 (3 x 3) | −3 wide equipment positions on the same planning module. |
| 60x150 | +1,000 sq ft | +12.5% | 12 (3 x 4) | Same wide equipment position count on this planning module; the difference is circulation and stored depth, not capacity. |
| 80x120 | +1,600 sq ft | +20% | 16 (4 x 4) | +4 wide equipment positions on the same planning module. |
| 80x80 | −1,600 sq ft | −20% | 6 (3 x 2) | −6 wide equipment positions on the same planning module. |
Areas are arithmetic on two stored size records; wide equipment position counts use this platform's 20 by 26 foot planning module and are not a capacity statement.
Because this footprint is planned as wide-span equipment floor, the useful next reads are different from the ones a differently shaped agricultural building suggests: wide span farm buildings, side-by-side equipment layout, clear-span width planning.
Visualization
Reading the 80x100 footprint as a agricultural building
FAQ
Questions about 80x100 agricultural building projects
Farm buildings grow because the operation changes: length is added along the sidewall, open bays are enclosed when the use narrows, and interior partitions are moved far more often than the shell is altered Practically, the 100-foot dimension is the one that extends; the 80-foot span is fixed once the frames are set.
Reserving 16 ft across the 80 ft dimension for movement leaves 64 ft of working width, which takes 3 wide equipment positions at 20 ft. Along 100 ft it takes 3 runs at 26 ft. That is 9 positions out of 8,000 sq ft, and the remainder is circulation, walls and the margin every plan needs. Whether that count is enough depends on what does the extra width buy that extra length could not have bought instead. These are planning figures computed from the footprint, not a quoted layout.
Not enough for a planned room at this footprint: the leftover across the width is what allows a machine to turn inside rather than reverse the full depth.
Whether a given width can be clear-spanned is an engineering question for the specific building and manufacturer. What is a planning question is where a column would fall if one were used, and whether that position is survivable for the layout.
It depends on the tallest machine as it actually arrives — loader arm part-raised, folded implement up — rather than the machine at rest. The stored configuration computes to 33.3 feet at the ridge, but the eave is the number that governs anything standing near a wall.
Methodology
How this page was produced
Sources and methodology
Find Steel Buildings dimensional records
Find Steel Buildings · Primary platform dataset · Tier 1 — code authority, standards body, primary dataset or manufacturer engineering
Supports: Stored nominal width, length, eave height, roof pitch and slab thickness for this subject.
International Building Code and International Residential Code
International Code Council · Model code · Tier 1 — code authority, standards body, primary dataset or manufacturer engineering
Supports: The framework of adopted codes and local amendments that decides permitting, separation and opening requirements. Cited as the governing framework, never as a local requirement.
- Dimensional figures: Width, length, eave height, roof pitch and nominal slab thickness come from this platform's stored record for the subject. Floor area, perimeter, wall area, roof area, ridge height and slab volume are computed from those inputs rather than transcribed.
- Wide equipment position fit: Counts, leftover strips and per-module areas are computed from the stored 80x100 record against this platform's 20 by 26 foot planning module for the agricultural building category, with 16 feet allowed for circulation. The module is editorial planning typology, not a code minimum or an engineered clearance.
- Allocation model: Zone shares come from this platform's use typology for agricultural equipment and crop shelter and are applied arithmetically to the stored 100-foot length.
- Allocation and layout models: Layout splits are arithmetic on the stored footprint, published as example allocation models. They are not survey findings and do not describe what buyers most often choose.
- Clearance and opening guidance: Clearance and opening statements are planning guidance. Final dimensions depend on the selected door system, header detail and the manufacturer's engineering for the building.
Methodology notes
- Prices: No price figure appears on this page. Cost data is published on this platform only with a documented inclusion basis, a collection date and a named source.
Drawn to scale
Plans and dimensions
Every drawing below is generated from the exact dimensions for this building, so proportions and areas are accurate.
Continue your research
Related planning topics
Background reading on the questions this page raises. None of these pages sells anything.
Compare 80x100 agricultural building configurations
Review the allocation models for this footprint side by side, then estimate the configuration you intend to build.