Boulder, CO Zoning Overlays & Bonuses: Density Bonus Law (2026)

C. C. 1981, and only if the project commits to permanently affordable units. The bonus scales in three tiers tied to Chapter 9-13, 'Inclusionary Housing': a project earns up to five additional units per acre if at least thirty percent of all units meet the permanently affordable standard, up to eight additional units per acre if at least thirty-five percent of units qualify, and the full ten additional units per acre if at least forty percent of units qualify as permanently affordable. None of these bonuses are automatic; the approving authority may prohibit or limit the density increase entirely if the applicant cannot demonstrate that the project satisfies the site review criteria in Section 9-2-14.

This ties the RMX-2 bonus directly to Boulder's broader inclusionary housing framework rather than granting extra density for market-rate development, meaning a developer weighing the bonus has to model the full site review submittal, the long-term affordability restrictions under Chapter 9-13, and the underlying RMX-2 form and bulk standards together before the extra units pencil out.