MOSCOW — Not since Joe the Plumber have contractors taken on such political overtones.

In a city where it is often impossible to get a plumber or any other repairman, somebody just figured out how to fix the pipes — and replace light bulbs, scrub off graffiti and patch leaky roofs. Throughout Moscow and other Russian cities, such elementary building repairs are suddenly in full swing as the city’s craftsmen, their reputations for surliness, laziness and drunkenness undiminished, are hurrying from one appointment to another.

Delighted Muscovites are crediting a new Web site for the unaccustomed Calvinist work ethic. Called Roszkh, it streamlines the process for filing complaints about maintenance of the communal areas of apartment buildings, like hallways and entryways, that remained public property after post-Soviet privatizations.

Stymied by a loss of momentum after street protests, Russian opposition leaders had been casting about for other approaches to remain relevant through what promises to be a long tenure for President Vladimir V. Putin. Aleksei Navalny, a blogger and political activist, hit upon the idea of the Web site, which is run under the auspices of his Foundation for Fighting Corruption.

“It’s difficult to say when the next wave of protests will come,” Mr. Navalny said in an interview about his new site, named after an acronym Russians use for their combined utility and building maintenance bills, ZhKKh.