I’VE REALLY GROWN to love Sag Harbor, particularly the back streets lined with uber-charming cottages – at this time of year, often covered in climbing roses.

But surprisingly, this year’s annual Sag Harbor House Tour, which takes place Friday, July 10 from 11-4, features a much more varied selection of houses than one might expect in a town whose history goes back to 1707, including a couple of startlingly modern ones.

Among the six houses on the tour is a 19th century workingman’s cottage owned by the proprietors of Fisher’s Antiques, a longtime fixture in the village, where walls have been removed to create an open, airy interior filled with a mix of modern, historic, and handmade furniture.

And yes, there’s a classic Greek Revival built in the 1840s by Daniel Smith, a merchant sloop captain, and a rambling barn-red house with an artist’s studio, a collection of Oriental rugs, and kitchen cabinets fashioned from leftover floorboards.

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But there’s also a pre-fab, modular 2,500 square foot house in nearby Noyac, above and below, designed by architect/owner Laszlo Kiss — an ecologically correct dwelling so tricked out with energy-saving features that the energy bill for a year, including heating, cooling, and maintaining the swimming pool, is less than $1,300.

The architect calls it the “ASAP House,” for “About Saving A Planet.” Set back behind ornamental grasses  and clematis climbing up steel wires, the structure, built last year, uses photovoltaic panels, geothermal heating, and natural shade and light.

Kiss hopes to build more ASAP houses, the design of which can be adapted to the needs of its owners. The house takes only 7 to 9 months to build. The cost per square foot: $265.

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The tour benefits the John Jermain Library. Tickets are $40 at the library, 201 Main Street in Sag Harbor. For further information, call 631/725-0049.