de Leon & Primmer Sets a Radiating Timber Roof over Herringbone Limestone at Kentucky's Locust Grove

Locust Grove is one of Kentucky's most significant historic landscapes: a historic house, formal gardens, a cemetery and open meadow on the edge of Louisville. Adding a new building to a place like this is a test of restraint. Too loud and it competes with the heritage it is meant to serve; too timid and it becomes a tent with better plumbing. de Leon & Primmer Architecture Workshop, led by Roberto de Leon and M. Ross Primmer, answered with the Locust Grove Pavilion, a 7,636-square-foot open structure completed in 2022 that sits beside the existing visitor center.

What makes the project worth your attention is how few moves it relies on. A single low timber roof, a field of glulam beams crossing at angles, slender steel columns, and three limestone-walled rooms laid in a herringbone pattern. The architects frame it as both a community gathering space and an instrument for interpreting the site. We think the second claim is the more interesting one, because it asks a rentable event pavilion to do the work of a lens.

A Roof That Stays Below the Tree Line

From across the meadow, the pavilion barely registers as a building. The roof reads as a thin horizontal band tucked under mature canopy, and the posts beneath it are slim enough to disappear at distance. Seen past the stone wall and iron gate, it holds the tree line rather than breaking it.

This is the right call for a heritage setting. The historic house remains the vertical figure in the landscape, and the new structure accepts the role of a ground-hugging horizon. The slight slope of the roof edge is the only gesture that hints at what is happening underneath.

Glulam Beams Crossing at Angles

Step beneath the roof and the restraint gives way to pattern. Glulam beams cross over a tongue-and-groove engineered wood deck, radiating rather than running in a neat orthogonal grid. Looking up, you read the ceiling as a woven field, closer to a canopy of branches than a conventional framing diagram.

The angled geometry earns its keep in two ways. It gives a large open event floor a sense of direction without walls, and it ties the interior back to the grove outside. A lone figure standing at the edge facing the lawn shows the point: the structure orients you toward the landscape, which is exactly what an interpretive building should do.

Herringbone Limestone as Solid Counterweight

Against the lightness of the timber, the limestone rooms supply mass. Their blocks are laid in a herringbone pattern that catches raking light across the concrete floor, turning what are essentially storage and restroom volumes into the most tactile surfaces on site.

Service cores are usually where a pavilion budget goes to die visually. Here they become the anchoring objects. The diagonal coursing also echoes the angled beams overhead, so the two materials speak the same geometric language while staying distinct in weight and texture.

Arrival Court and Open Edges

The entry plaza is handled with the same economy. Slatted wooden benches and young birch trees sit against the stone wall, creating a forecourt that works on ordinary days as much as on event nights. Visitors arriving at the visitor center get a place to linger before heading out into the grounds.

Along the colonnade, the sloping roof edge meets the stone and the posts, and the building stays open to the air. In summer, the pavilion reads less as an enclosure and more as a shaded edge to the lawn.

Plans and Drawings

The site plan shows how deliberately the pavilion is placed: beside the visitor center and arrival drive, held back from the historic house, formal gardens and cemetery. The floor plan is disarmingly simple, an open event area with storage and restroom volumes, an entry plaza, a service yard and planted beds.

The reflected ceiling plan is the most revealing drawing. It makes clear that the crossing glulam beams over engineered wood decking are the organizing idea, with steel columns and three limestone-walled rooms set along one edge. The elevations and sections confirm the gaps between herringbone limestone panels, which let air and views slip through the solid walls.

Why This Project Matters

Historic sites across the United States face the same pressure: they need revenue-generating event space to survive, and that space often arrives as a generic tent or a pastiche barn. The Locust Grove Pavilion shows a third path. It is unmistakably contemporary, yet it defers to the landscape through height, placement and a limited material palette.

The lesson for designers is that restraint does not mean blandness. By concentrating ambition into two elements, a patterned timber roof and patterned limestone rooms, de Leon & Primmer gives a modest program real presence without stealing attention from the place it serves. That is what an instrument for interpretation should be: something you look through, not at.

Locust Grove Pavilion by de Leon & Primmer Architecture Workshop (Roberto de Leon, M. Ross Primmer; design team Michael Gastineau, Nate Ryman, John Welcher), Louisville, Kentucky, United States. Area: 7,636 ft². Completed 2022. Photography by de Leon & Primmer Architecture Workshop.

About the Studio

Share Your Own Work on uni.xyz

If projects like this are the kind of work you want to make, uni.xyz is a place to publish your own, find collaborators, and enter design competitions.