Gem Plumbing & Heating, Lincoln, R.I., expanded its services and market area. In addition to plumbing, drain cleaning, heating and air conditioning, the company added electrical and septic tank services to its residential services division last year. This year, the company is rolling out well and septic services, indoor air quality and water purification, landscape lighting, and whole-house handyman services. In addition, the company now operates in all or portions of five New England states. In recent months the company has opened two new satellite offices in South Easton, Mass., and Hampton, N.H.