Historic Ahwahnee Hotel - Yosemite National Park

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Treeline Construction Inc. has served as a trusted preservation contractor for the Historic Ahwahnee Hotel for more than a decade, completing a wide range of rehabilitation, restoration, and structural projects in collaboration with the National Park Service.

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Our work at the Ahwahnee has included:

• Mural Room Restoration: Phased restoration of the interior finishes in the Ahwahnee’s Mural Room, scheduled around hotel operations. After a discovery phase to assess hidden conditions, Treeline took apart the historic panel-and-batten wall system and labeled and protected the reusable material. Where water damage was found, we built matching replacement panels. All panels, battens and baseboards were then refinished and reinstalled. The project also included:

  • Replacing about 342 square feet of red oak tongue-and-groove flooring with matching new stock, then sanding and refinishing the full floor

  • Patching, floating and repainting the plaster ceiling

  • Re-glazing the plaster faux wood beams to bring back their original appearance

  • Staining and varnishing the window and door trim to match the restored paneling

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          Together, this work returned the room’s finishes to a consistent whole that respects its historic character.

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• Roof Deck Rehabilitation: Comprehensive restoration of deteriorated concrete roof decks and water-damaged structural log columns. Treeline implemented an in-field redesign to replace column bases with concrete footings and copper flashing—executed ahead of schedule and without guest impact.

• Bridge Deck Replacement: Removal and replacement of a deteriorated exterior bridge deck, restoring safe and durable guest access.

• Historic Door Restoration: Multi-year rehabilitation of the Ahwahnee’s original doors, each uniquely restored to preserve architectural integrity and historic character.

• Additional Repairs: Plaster restoration in the Tudor Lounge and Tressider Room, 5th-floor sidewall and paint removal, and water intrusion testing.

• Bar and Kitchen Addition and Rehabilitation: As part of the Remove Barriers Act project, Treeline provided selective demolition, concrete work, and finish carpentry for the expansion of the Ahwahnee’s bar and kitchen. The project included new board-formed concrete walls, custom woodwork, and historically accurate finishes designed to match the original 1920s construction.

• Exterior Deck Railing Replacement: Complete removal and replacement of all 54 exterior deck log railings, using a custom-engineered system of spring-loaded brass dowels to secure new logs without impacting the surrounding historic concrete and granite.

• Structural Stabilization and East Wing Rehabilitation: Reinforcement and restoration of the hotel’s east wing structure, preserving the building’s historic integrity while improving seismic and structural performance.

• Guest Cabin Rebuilds: Reconstruction of storm-damaged guest cabins, including restoration of historic materials and detailing.

• Interior Plaster Restoration: Repair and restoration of water-damaged plaster finishes in guest rooms and common spaces.

• Waterproofing and Leak Mitigation: Investigation and correction of water intrusion at the presidential suite and exterior stairways, along with ongoing maintenance and abatement efforts.

• Ahwahnee Temporary Kitchen: Construction of a temporary kitchen facility designed to accommodate ongoing hotel operations while preserving the site’s historic setting.​

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From structural retrofits to fine restoration carpentry, Treeline’s continued partnership at the Ahwahnee reflects our deep understanding of the building’s historic fabric, our technical expertise in preservation construction, and our commitment to craftsmanship that endures.