Building Types
80x100 Livestock Barn
- Width
- 80 ft
- Length
- 100 ft
- Floor area
- 8,000 sq ft
- Perimeter
- 360 ft
Use
How a 80×100 Livestock Barn May Be Used
Equipment shelter
Machinery clearance height and door width are usually the limiting factors, not floor area.
Commodity and forage
Bulk storage depth against the sidewalls affects how the building is loaded and unloaded.
Drive-through access
End-to-end access lets equipment pass through without reversing.
Seasonal working space
Open floor is commonly kept for repairs and staging between seasons.
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
Configuration summary
| Building type | Livestock Barn |
|---|---|
| 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 Livestock Barn
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. Interior divisions are the last decision that should be fixed, because they are the first one that usually changes.
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 a deep-bedded pack barn cleaned out in campaigns rather than daily is the fit-out deep bedded pack barn implies, along with framed openings and the height chosen for the 80 ft span.
- ventilation provisions and sidewall openings
- interior pens, gates and durable linings
- the alley width the cleaning machine needs
- drainage and washdown provisions
Overview
A 80x100 livestock barn planned as a deep-bedded pack barn cleaned out in campaigns rather than daily
This page is ordered around the clean-out, because it is the one operation that touches every square foot and the only one that a fixed obstruction can ruin.
The footprint holds 4 bedded bays — 2 across by 2 deep — and the remaining 6 feet is marginal: there is no clean-out approach, so the pack is emptied through the same opening used daily and the building is out of use while it happens.
Efficiency is the useful number here: 2,000 square feet of enclosed floor per bedded bay, against a 1200-square-foot module. That is generous — the footprint is doing more than hold modules. Ground conditions and drainage decide the floor before the frame does.
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 2 runs of bedded bays at 40 ft, leaving 20 ft over — the 20 ft is where the argument about this size actually happens. A deep-bedded plan accumulates through a season and is emptied in one operation, which makes the clean-out the event the building is designed around. Anything fixed in the machine's path — a post, a pen division, a water line — turns a day's work into a week's. A stock building is entered at night by somebody alone, and lighting and route legibility are part of the brief.
This footprint is planned as a deep-bedded pack barn cleaned out in campaigns rather than daily. Spent as a square 89 by 89 instead, the same 8,000 sq ft would stand 2 bedded bays across rather than 2, 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 2 bedded bays 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. Daily work is bedding and feeding at the edges; the intensive work happens once or twice a year. The plan is judged on the intensive event because that is when its errors are expensive. Ventilation in a stock building follows the animals and the climate, and it is the system most often compromised by later additions.
Areas, perimeter, roof area, ridge height, slab volume and the bedded bay counts on this page are computed from the stored 80x100 record and this platform's planning module for the livestock barn category.
Openings
Openings for 2 bedded bays across
One opening per position works on this gable: 2 across 80 feet, with 20 feet of wall to distribute as piers. Splitting that margin evenly is what keeps the elevation buildable. Plan the exit as carefully as the entrance; buildings are emptied under more time pressure than they are filled.
A full-width or end opening that the clean-out equipment can enter and turn in. This is the defining opening of the plan and it is set by the machine rather than by the stock.
Animals loaded through a handling route at one end; feed and bedding delivered to a different point entirely.
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.
Usable area
How the 8,000 square feet divides at 80x100
Computed bedded bay fit for a 80x100 livestock barn
| Measure | Computed at this footprint |
|---|---|
| Bedded bays across the 80-foot width | 2 at a 30-foot module |
| Leftover width | 20 ft (2,000 sq ft as a full-length strip) |
| Rows along the 100-foot length | 2 at a 40-foot module after 14 ft of circulation |
| Leftover depth | 6 ft (480 sq ft across the width) |
| Total bedded bays | 4 |
| Share of floor committed | 60% |
Module footprint used here is 30 by 40 feet, this platform's planning module for a livestock barn. 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 |
|---|---|---|
| Stalls and animal housing | 45 ft | 3,600 sq ft |
| Aisle and handling space | 30 ft | 2,400 sq ft |
| Tack, feed and storage | 25 ft | 2,000 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.
Height
Interior height for a 80x100 livestock barn
Span drives headroom at 80x100: 80 feet of width on a 4:12 pitch puts 33.3 feet over the middle and 20 feet at the walls, so where a tall item stands matters as much as how tall it is. What the building holds in its busiest week is the honest brief; the rest of the year is slack.
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 deep bedded pack barn genuinely needs the extra clear height or only the floor area.
Ventilation across 8,000 square feet at this height: air quality above the animals is the defining requirement of the building, and it drives ridge, eave and sidewall decisions together.
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.
Allocation
Dividing the floor for a deep-bedded pack barn cleaned out in campaigns rather than daily
The housing pattern this barn could equally be planned around is a barn planned around handling, sorting and treating animals rather than housing them: there is no holding area, so gathering happens in the yard and the working position is fed one animal at a time. Dividing the 8,000 sq ft by the 30 by 40 ft bedded bay gives roughly 4 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 4 or drops to 2 comes back to the question this footprint is really answering: how does the machine that empties this building get in, and what has to be moved before it can?
Treating the last 6 feet as a room is the recurring planning error at 80x100: there is no clean-out approach, so the pack is emptied through the same opening used daily and the building is out of use while it happens. Neighbouring buildings, setbacks and the approach road often decide the orientation before the plan does.
Spare width is the more valuable of the two leftovers here: a continuous 20-foot strip beats the same area stranded at the end of the run, because it touches every position along the way. The plan should survive the day the largest item the operation owns has to come inside.
Spent as a square 89 by 89 instead, the same 8,000 sq ft would stand 2 bedded bays across rather than 2, 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 2 bedded bays 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. Daily work is bedding and feeding at the edges; the intensive work happens once or twice a year. The plan is judged on the intensive event because that is when its errors are expensive. Ventilation in a stock building follows the animals and the climate, and it is the system most often compromised by later additions. That movement pattern, not the 8,000-square-foot total, is what decides whether the leftover 6 feet is useful here.
Configurations
Configuring 4 bedded bays at 80x100
Nominal bay division computes to 4 bays at about 25 feet, narrower than the 30-foot module — so frame lines land inside positions and the interior has to be set out from the columns. A leftover strip earns its place only when something is deliberately put in it; otherwise it is circulation with a nicer name.
With 2 rows deep, the rear row is behind the front one. Without a route past it, those bedded bays become storage positions rather than working ones — the real cost of depth at this width. The corner nobody plans for is the one that fills first, which is an argument for planning it.
Bays are added in line, keeping every bay reachable from the same clean-out end.
Configured as a deep-bedded pack barn cleaned out in campaigns rather than daily, 80x100 is judged on whether the 4 bedded bays it holds match the operation, and on whether the 20 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?
- How does air move through the barn on a still day?
- Can the cleaning machine work the full alley without moving animals twice?
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 livestock barn
| Footprint | Floor area | Bedded bays |
|---|---|---|
| 40x80 | 3,200 sq ft | 4 (2 x 2) |
| 60x60 | 3,600 sq ft | 2 (2 x 1) |
| 50x80 | 4,000 sq ft | 4 (2 x 2) |
| 40x100 | 4,000 sq ft | 6 (2 x 3) |
| 60x80 | 4,800 sq ft | 2 (2 x 1) |
Areas computed from each stored size record; bedded bay counts computed with the same 30 by 40 foot planning module.
- 40x80 holds the same 4 bedded bays but changes the leftover depth by +6 feet, which is where the difference is actually felt.
- 60x60 moves the count from 4 to 2 bedded bays (2 across by 1 deep), which is the reason to choose between them.
- 50x80 holds the same 4 bedded bays but changes the leftover depth by +2 feet, which is where the difference is actually felt.
Nearby footprints read for a livestock barn: exact change in area and in planning bedded bays
| Footprint | Area Δ | % Δ | Bedded bays at that footprint | What changes for this use |
|---|---|---|---|---|
| 50x150 | −500 sq ft | −6.2% | 10 (2 x 5) | +6 bedded bays on the same planning module. |
| 60x150 | +1,000 sq ft | +12.5% | 15 (3 x 5) | +11 bedded bays on the same planning module. |
| 80x120 | +1,600 sq ft | +20% | 4 (2 x 2) | Same bedded bay count on this planning module; the difference is circulation and stored depth, not capacity. |
| 80x80 | −1,600 sq ft | −20% | 6 (3 x 2) | +2 bedded bays on the same planning module. |
Areas are arithmetic on two stored size records; bedded bay counts use this platform's 30 by 40 foot planning module and are not a capacity statement.
Because this footprint is planned as a deep-bedded pack barn cleaned out in campaigns rather than daily, the useful next reads are different from the ones a differently shaped livestock barn suggests: deep bedded pack barn, clean out access, seasonal bedding accumulation.
Visualization
Reading the 80x100 footprint as a livestock barn
FAQ
Questions about 80x100 livestock barn projects
7,200 square feet of wall and 8,433 square feet of roof at a 4:12 pitch — the roof exceeding the floor by 5%.
Reserving 14 ft across the 80 ft dimension for movement leaves 66 ft of working width, which takes 2 bedded bays at 30 ft. Along 100 ft it takes 2 runs at 40 ft. That is 4 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 how does the machine that empties this building get in, and what has to be moved before it can. These are planning figures computed from the footprint, not a quoted layout.
The width leaves 20 feet spare after 2 bedded bays. That margin absorbs wall storage and passing room. Width is the dimension that cannot be extended later.
Because the bedding pack builds up through the season and the air space above the animals reduces as it does. The allowance is specific to the operation and the climate.
Length here buys 2 rows and 4 nominal bays; width buys 2 positions side by side. At this aspect ratio both dimensions are still adding usable positions.
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.
- Bedded bay fit: Counts, leftover strips and per-module areas are computed from the stored 80x100 record against this platform's 30 by 40 foot planning module for the livestock barn category, with 14 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 equine housing and riding space 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 livestock barn configurations
Review the allocation models for this footprint side by side, then estimate the configuration you intend to build.