Green houses: Three chances to change your address and the world simultaneously.

$564,900

Philadelphi

1317 E. Berks St.

Taxes: $193 (10-year tax abatement).

This modern rowhouse, built by Onion Flats L.L.C., has achieved gold certification through the Leadership in Energy and Environmental Design (LEED) program, a national standard for sustainable building. Along with three bedrooms, three full baths and three balconies, the light-filled, energy-efficient house has a rain cistern in the backyard and a grass-covered "green" roof deck.

Pros: Price includes a three-wheel electric vehicle with a reserved on-street parking space. Roof is solar ready.

Cons: Only access to the roof is via a metal ladder.

Listing agent: Johnny McDonald, Re/Max City Space; 215-625-3650 or 215-669-0469.

$878,541

Wayne

316 Iron Works Way, Unit 312

Estimated taxes: $12,000

Fees: $375

Part of the Pembroke North development designed by Robert Venturi, this spacious two-bedroom, 2½-bath condo includes a large, private ground-floor terrace, a laundry room, and custom closet fittings. Built with sustainable materials and featuring state-of-the art insulation and geothermal heating and cooling, the still-under-construction complex is registered for LEED silver certification.

Pros: Price includes underground parking, locked storage.

Cons: Nearby train line may be noisy when custom-made, sound-dampening windows are open.

Sales office: Razak Co., George M. Hall; 610-687-3872.

$345,000

Lansdale

1684 Kriebel Rd.

Taxes: $2,930

A former one-room schoolhouse, this home was renovated by a green-building-supply store owner, who used earth-friendly materials such as bamboo flooring, low volatile-organic-compound paints and natural earth-plaster wall finishes. In addition to three bedrooms, two baths and a wisteria-draped front porch, there is a new kitchen with a radiant-heat Pennsylvania bluestone floor.

Pros: A 400-square-foot converted garage, heated by high-efficiency soapstone wood stove, could be a studio or an office.

Cons: The two upstairs bedrooms are tiny.

Listing agent: Janet Cribbins, Prudential Fox & Roach; 215-248-6534.