Halsted Welles Associates

HWA is a published New York City Design-Build-Maintenance firm specializing in rooftops, terraces, and townhouse gardens. For over 50 years we have worked in partnership with a distinguished clientele to develop unique design solutions for lifestyle and functional outdoor living. HWA has set the gold standard for creating gardens in an urban setting with an understanding of native ecology and human needs. Our talented, multi-disciplinary team includes designers, horticulturists, engineers, carpenters, and support staff. We are committed to balancing modern living with outdoor space purposefully designed for connectedness with nature, creating outdoor retreats that are idealized visions of natural systems. HWA offers a full range of services in all aspects of Design and Construction Specifications, Installation, and Garden Services. We design custom made and custom fitted hardscape elements including planters, furniture, shade structures, seasonal heating elements, lighting, and irrigation systems. Garden services include seasonal planting, pest management, plant restoration, ecological plant care, and hardscape maintenance. HWA can also repair or restore existing garden elements.