Questions of density, and how to add it to single-family neighborhoods, abound in this article focusing on Honolulu and other communities on Oahu.

Stewart Yerton reports for Honolulu Civil Beat on the growing controversies surrounding large homes, built as multi-family dwellings, in traditionally single-family neighborhoods in Oahu.
The article commences with the controversy created by a proposed development for a nine-bedroom house designed to house workers in the Pacific Heights area of Honolulu, home to historic houses and affluent neighbors. Yerton explains the zoning conundrum presented by the home:
The problem is the house was going to be in a quiet residential neighborhood of historic homes. And even if the structure technically met the density criteria allowed by Honolulu’s land-use ordinance, its apparent intended use – as essentially an apartment building or dormitory – simply wouldn’t be allowed in a place zoned for single-family homes.
The development proposal caught the attention of Patrick Smith, president of the Nuuanu/Punchbowl Neighborhood Board, which has an oversight role for the project as part of Oahu’s Neighborhood Board System, established in 1973. "We don’t want our neighborhood having apartment buildings," Smith is quoted as saying in the article.
The neighborhood board succeeded in killing the project, reports Yerton, but the example is far from the only residential development controversy on the island. Residents and policymakers across Oahu are rejecting multi-room houses, "known as 'monster homes,'" amidst a surge in housing costs. The question of how to add density on the island is unanswered, according to the article.
Previous efforts include Bill 7, adopted by the Hawaii State Legislature in 2019. According to Yerton, the bill's incentives for density in the form of redeveloped small homes and under-used, walk-up apartment buildings applies to 7,000 properties in the state but has produced zero new projects. More on Bill 7 is available from an article by Noelle Fujii-Oride for Hawaii Business, published earlier in February 2022.
The source article, linked below, goes into feature depth on the housing development and zoning specifics in Hawaii and Oahu, as well as one architect who recently managed to navigate the Bill 7 "gauntlet."
FULL STORY: More Housing In Honolulu Means More Density. Are Monster Homes The Only Way?

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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research