A. 
Density Denominator. Density is determined on an individual development proposal basis. For developments including multiple lots or parcels, the overall density of the entire proposed development site is calculated.
B. 
Gross and Net Density.
1. 
When determining minimum required density of an individual development, net density is used for calculations.
2. 
When determining maximum allowed density of an individual development, gross density is used for calculations.
C. 
Deductions to Calculate Net Area. Net area is the total area of land within an individual development, excluding the following areas (measured in square feet):
1. 
Right-of-way dedications for new rights-of-way or expansions of existing rights-of-way;
2. 
Land constrained by slopes of 25% or greater;
3. 
Special flood hazard area (SFHA), as determined by the Federal Emergency Management Agency;
4. 
Wetlands, as determined by the Oregon Department of State Lands;
5. 
Stream corridors, as defined in Article 5.130;
6. 
Open space or parkland and anticipated to be publicly owned;
7. 
Open space owned in common by owners within a residential development; and
8. 
Public utility easements.
D. 
Density Calculations.
1. 
Minimum Density. The minimum number of dwelling units required is calculated by dividing the net area (pursuant to TDMC Section 10.6.170.020(C)) by 43,560 square feet to convert the area to acres, then by multiplying the resulting acreage by the most restrictive minimum required dwelling unit density applicable to the project's zone district. See TDMC Section 10.6.070.020 for fractional rounding.
2. 
Maximum Density. The maximum number of dwelling units permitted is calculated by dividing the gross area by 43,560 square feet to convert the area to acres, then by multiplying the resulting acreage by the least restrictive maximum required dwelling unit density applicable to the project's zone district. See TDMC Section 10.6.070.020 for fractional rounding.
E. 
Density Fractional Rounding. If after a calculation the result applied is a rounded whole number which would result in a total number of dwelling units exceeding the maximum Comprehensive Plan density range, the development shall be permitted no more than one dwelling unit greater than the density range (e.g., an RL-zoned development with a maximum density of 8.65 may be rounded up to 9, thus exceeding the 8.712 maximum allowed density of the RL zoning district).
F. 
Minimum Lot Allowances.
1. 
Regardless of the density calculation described above, any residentially zoned lot of record is allowed at least one dwelling unit.
2. 
Any residentially zoned lot of record has a density of at least one dwelling unit.
(Ord. 23-1395; Ord. 25-1414, 7/14/2025)
A. 
No proposed development may exceed the maximum gross density prescribed to all developments within the underlying zone.
B. 
RL, RH, and RM Zoning Districts (All Development). For all proposed developments not meeting minimum density requirements, an approved redevelopment plan (pursuant to TDMC Section 10.3.120) shall be filed with the Wasco County Clerk at the applicant's expense and all development proposed shall comply with the approved redevelopment plan, unless a new redevelopment plan is approved by the City.
C. 
Duplexes and Accessory Dwelling Units.
1. 
Minimum Density.
a. 
Duplexes. For purposes of calculating minimum density, duplexes are counted as 2 dwelling units.
b. 
Accessory Dwelling Units. For purposes of calculating minimum density, accessory dwelling units are counted as 1 dwelling unit.
2. 
Maximum Density.
a. 
Duplexes. For purposes of calculating maximum density, duplexes are counted as 1 dwelling unit.
b. 
Accessory Dwelling Units. For purposes of calculating maximum density, accessory dwelling units are counted as zero dwelling units.
(Ord. 23-1395)