100x120 Steel Riding Arena

No price appears on this page. The quantities that scale an estimate at 100x120 are 12,000 square feet of slab, 148.1 cubic yards of nominal concrete, 6,160 square feet of wall cladding and 12,369 square feet of roof cladding. Storage expands until it meets a wall, so give it a wall on purpose.

Surface depth and consistency matter more here than in flatwork, and the base is engineered for the specific loading and drainage.

• the clear span across the riding area
• eave height for mounted clearance across the full width
• kickboards and interior lining
• the surface base and drainage, which is site work

This page is ordered around the second population this building acquires, because spectators bring access, sightlines and facilities that the working surface cannot supply.

The footprint holds 8 course lines — 4 across by 2 deep — and leaves 34 feet of depth for storage for jumps and poles inside the building, so the course changes without carrying equipment through weather.

Efficiency is the useful number here: 1,500 square feet of enclosed floor per course line, against a 864-square-foot module. That is generous — the footprint is doing more than hold modules. The count of working positions, not the headline area, is the figure that survives contact with the operation.

A 100 by 120 footprint is a mildly directional plan: 12,000 sq ft enclosed by 440 ft of wall, at a 1.2:1 length-to-width proportion. Along its 120 ft dimension it takes 3 runs of course lines at 36 ft, leaving 12 ft over — the 12 ft is where the argument about this size actually happens. A jumping arena is about approaches and landings rather than total area. Fences need a straight run before and a turning distance after, which means the long dimension is doing most of the work and the corners have to be genuinely usable. Dust control follows the surface and the ventilation together rather than either alone.

At 100x120 the operating question is a specific one: does this footprint hold a line of fences with a straight approach and a place to land and turn? That is a different question from the one a riding arena of another shape has to answer, and it is why this footprint is planned as an arena planned around a jumping course and its approaches rather than as generic covered area.

One opening per position works on this gable: 4 across 100 feet, with 4 feet of wall to distribute as piers. Splitting that margin evenly is what keeps the elevation buildable. The mezzanine that is added afterwards is the change order that reprices the frame.

A door wide enough to bring jump equipment through, in addition to the horse entrance.

Nominal bay division computes to 5 bays at about 24 feet, wider than the 24-foot module — so a position can sit inside a bay without a frame line splitting it. Where the building sits on the site changes how much of this floor is genuinely reachable.

With 2 rows deep, the rear row is behind the front one. Without a route past it, those course lines become storage positions rather than working ones — the real cost of depth at this width. Snow, wind and site exposure change what this shape costs to build long before the interior plan does.

Extension is cheapest along the 120 ft dimension, where each added bay repeats work already framed; widening past 100 ft is a different frame rather than a longer one. Growing to 100 by 156 adds a 4th run of course lines — useful if the constraint is course lines rather than the 12 ft already spare at the far end.

Configured as an arena planned around a jumping course and its approaches, 100x120 is judged on whether the 8 course lines it holds match the operation, and on whether the 4 feet of spare width leaves the route this mode depends on.

• Does the work need an interior street with independent zones on both sides and turning room at each end, or does it need a second lane that this 100-foot span cannot give?
• Is the 120-foot length being bought for depth, or for the repeated bays — a long repeating bay sequence, so segment boundaries are set by bay lines rather than by walls?
• What span does the discipline require, and is the clearance held across the full width?
• Can the groomer get in without the arena being unusable?

The riding use this surface could equally be prepared for is a schooling arena sized for flatwork and lessons rather than competition: there is no corner out of the track, so anybody halted is standing in the way of anybody working. Dividing the 12,000 sq ft by the 24 by 36 ft course line 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: does this footprint hold a line of fences with a straight approach and a place to land and turn?

The 34-foot leftover depth is 3,400 square feet across the full width — deep enough to plan deliberately, and at this footprint it goes to storage for jumps and poles inside the building, so the course changes without carrying equipment through weather. Access, not area, is what makes a plan feel small once it is in use.

Spare width is the more valuable of the two leftovers here: a continuous 4-foot strip beats the same area stranded at the end of the run, because it touches every position along the way. Set the openings before the interior, because the openings cannot move and the interior can.

At 1.2:1 the plan is close enough to square that neither width nor depth is doing the arguing; what decides the layout here is where the openings go, because no proportion is forcing a direction on the floor. Spent as a square 110 by 110 instead, the same 12,000 sq ft would stand 4 course lines 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. 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. Courses are rebuilt frequently, so moving equipment is a routine operation and the storage position is an operational decision. Ventilation in an arena serves dust and moisture, and it is designed for the specific building. That movement pattern, not the 12,000-square-foot total, is what decides whether the leftover 34 feet is useful here.

The stored configuration carries a 14-foot eave and computes to 26.5 feet at the ridge on a 3:12 pitch — a 12.5-foot rise across 100 feet. Height is therefore not uniform, and the sidewall is the constraint. Fire separation, egress and occupancy are determined for the specific building and can reshape this plan entirely.

Height on a 100 ft span is a separate decision from the 120 ft length, and it is the span that sets the frame's behavior. Raising the eave over 12,000 sq ft affects every bay along the 120 ft dimension, so the test is whether jumping course lines genuinely needs the extra clear height or only the floor area.

Ventilation across 12,000 square feet at this height: dust from the surface makes air movement a working-condition requirement for horses and riders alike.

• 60x80 moves the count from 8 to 4 course lines (2 across by 2 deep), which is the reason to choose between them.
• 40x120 moves the count from 8 to 3 course lines (1 across by 3 deep), which is the reason to choose between them.
• 50x100 moves the count from 8 to 6 course lines (2 across by 3 deep), which is the reason to choose between them.

Because this footprint is planned as an arena planned around a jumping course and its approaches, the useful next reads are different from the ones a differently shaped riding arena suggests: jumping course lines, approach and landing distance, jump storage.