Two years after declaring a hashtag war against ugly second-floor additions to classic Chicago bungalows, an advocacy group is unveiling a package of design ideas for what it considers better-looking alternatives.

"We're showing that you can maximize the space without dropping a big square box on top of that detailed (single-story) bungalow and ruining the look" of the traditional facade, said Manuel Hernandez.

An architect and general contractor with the firm Design Seed in Ravenswood, Hernandez is project manager for the Chicago Bungalow Association's Bungalow Expansion Project, developed in partnership with the American Institute of Architects Chicago chapter.

The expansion project's website, which launches today, shows three architect-designed plans for adding second-floor space that fit in with the original bungalow look, along with rough cost estimates, from about $143,000 to $192,000.

The designs grew out of the bungalow association's #StopThePop campaign on Facebook and Change.org, sparked two summers ago by a developer's practice of ripping off the sloped roofs of Chicago bungalows and replacing them with a boxy second floor.

The additions "destroy the streetscape on these blocks where you're used to seeing those iconic bungalows all in a row," said Mary Ellen Guest, executive director of the bungalow association. Many of Chicago's 80,000-plus bungalows, mostly built in the first half of the 20th century, were built a story-and-a-half tall, the half being the unfinished space beneath the sloping roof. Homeowners would finish that space as their family grew. Now, both building codes and the modern style of living push for creating a full second floor.