Sources
Sources and reference standards
Market prices come from current local quotes; regulatory and technical context uses authoritative sources where possible.
U.S. Access Board — Accessible Routes
U.S. Access Board — Accessible Routes. U.S. accessibility context for routes near entrances and canopies.
U.S. Access Board — Entrances, Doors and Gates
U.S. Access Board — Entrances, Doors and Gates. Entrance and accessibility context.
OSHA — Walking-Working Surfaces
OSHA — Walking-Working Surfaces. U.S. workplace surface-safety context around commercial exterior areas.
Local requirements
Accessibility, building, fire, workplace, planning and construction requirements vary by jurisdiction. The authority having jurisdiction and project team control the actual project.