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  • Inclusionary Housing
  • Affordable Housing Policy

Cash-in-Lieu (CIL) Calculator

The City of Boulder Inclusionary Housing Program is designed to maintain a diverse housing stock that meets the needs of people of all incomes. Currently the program requires that 20% of all new residential development be provided as permanently affordable housing. For-sale developments must provide at least have of the required affordable units on-site, the other half may be satisfied with a CIL contribution.  Rental developments do not have an on-site requirement and may satisfy the entire requirement with CIL.

Effective July 1, 2018 program updates will require that 25% of all new residential development be provided as permanently affordable housing.  The program updates include incentives when more than half of any required FOR-SALE affordable units are provided on-site. The higher percentage of units combined with the incentives are optional at this time and become mandatory on July 1, 2018.

Please note that all options to satisfy the inclusionary requirement, including CIL, must be approved by the city. Please contact a housing planner at 303-441-3157, # 5, to determine an acceptable option for satisfying the Inclusionary Housing requirement for your project.

The CIL Calculator below may be used to ESTIMATE the amount of CIL for a planned project or explore different scenarios for providing a combination of CIL and affordable units. This calculator is available for your convenience only. Please note that the data generated by this calculator is not transmitted to city staff.

CIL is due at the time of residential building permit issuance. CIL amounts are adjusted annually on July 1 and the amount in place when paid will apply.

Check out our web site boulderaffordablehomes.com for more details.


Required fields

Cash in Lieu Calculation

1. Total Residential Units (All New Market-Rate & Proposed Affordable Units)

  • Does not include existing units
  • If units were or will be demolished on the property to make way for new units, please contact a housing planner for a CIL estimate.

2. Required Permanently Affordable Units (25% effective 7/1/2018)

3. Are the new units in your development Rental or For-Sale?

If you project includes both, please stop here and contact a housing planner for a CIL estimate.

4. Number of Proposed on-site Affordable Units

  • For sale developments should provide a minimum of 50% of the affordable units on-site.
    • For fractions standard rounding applies; .5 of a unit and above is rounded up; .4 and below is rounded down
  • Rental projects do not have a minimum on-site requirement

5. Average Unit Size for All Units in the Development

6. Are the Units in Your Project Attached, Detached, Townhome or Attached Small?*

If you project has a mix of units, stop here and contact a housing planner for a CIL estimate.

  • Townhome: Attached single-family dwelling unit located or capable of being located on its own lot, and is separated from adjoining dwelling units by a wall extending from the foundation through the roof which is structurally independent of the corresponding wall of the adjoining unit.
  • Attached small: Buildings with two to eight units
  • Attached: Building with nine or more units
  • Detached: Single family homes

7. CIL Amount Due for Each Required Affordable Unit

  • (multiplier only; see 8 [rental] or 9 [for sale] below for final estimate)

8. CIL Estimate for a Rental Development

  • All required affordable units may be provided as CIL
  • Amount shown is for the entire project, not per unit

9. CIL Estimate for a For-Sale Development

  • A minimum of 50% of the required affordable units should be provided on-site.
  • The balance may be provided as CIL.
  • Amount shown is for the entire project, not per unit.

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