How to Choose an ADU Contractor in Colorado (Questions to Ask)
How to hire an ADU contractor in Colorado, the questions to ask, the red flags to avoid, how licensing works here, and modular versus site-built compared.
Wheat Ridge’s real rules, taxes and rents — read from the codified ordinance, every figure sourced and dated. Here: rents floored at $1,754/mo. Run your own numbers below, free.
Read from the Wheat Ridge Code Of Ordinances itself — the operative legal text, not a website summary. Wheat Ridge is an HB24-1152 subject jurisdiction: since June 30, 2025, Colorado law guarantees one ADU by right on any lot with a single-family home here.
| Maximum ADU size | 1,000 sq ft, or 50% of the primary dwelling's floor area, whichever is smaller; an attached ADU in a basement or second floor may exceed this cap, up to the area of the first floor of the same structure.verified September 2026Wheat Ridge Code Of Ordinances §26-646the ordinance textThe floor area of an accessory dwelling unit shall not exceed fifty (50) percent of the gross floor area of the primary dwelling unit, or one thousand (1,000) square feet, whichever is more restrictive. ... As an exception, an attached accessory dwelling unit in a basement or second floor may exceed the size limitations, provided the area does not exceed the area of the first floor of the same structure. |
| Size relative to the main house | 50% of the primary dwelling's floor area, or 1,000 sq ft, whichever is smaller; an attached ADU in a basement or second floor may exceed this cap, up to the area of the first floor of the same structure.verified September 2026Wheat Ridge Code Of Ordinances §26-646the ordinance textThe floor area of an accessory dwelling unit shall not exceed fifty (50) percent of the gross floor area of the primary dwelling unit, or one thousand (1,000) square feet, whichever is more restrictive. ... As an exception, an attached accessory dwelling unit in a basement or second floor may exceed the size limitations, provided the area does not exceed the area of the first floor of the same structure. |
| Height limit | 25 ft (detached ADUs, any zone); attached ADUs instead follow the zone district's principal building height standard (no single citywide number stated).verified September 2026Wheat Ridge Code Of Ordinances §26-646the ordinance textA detached accessory dwelling unit in any zone district may not exceed twenty-five (25) feet in height. ... Attached accessory dwelling units shall be subject to the principal building development standards for the zone district in which they are located, set forth in sections 26-205 to 26-214 and this section, including bulk plane requirements for ADUs located in residential zone districts. |
| Short-term rental | Yes, but only as an owner-occupied/partial-home rental; the property owner must continuously occupy either the primary dwelling or the ADU for the duration of the rental.verified September 2026Wheat Ridge Code Of Ordinances §26-646the ordinance textA short-term rental shall be permitted to operate within an accessory dwelling unit and shall be considered an owner-occupied or partial-home short-term rental. ... If the ADU is to be operated as a "partial-home" short-term rental as described in section 26-645, then the property owner, as reflected in title records and evidenced by voter registration, vehicle registration or other similar means, must occupy either the primary dwelling unit or the ADU. |
| Extra parking | None beyond the main houseverified September 2026Wheat Ridge Code Of Ordinances §26-646the ordinance textParking: No additional parking spaces shall be required. |
Source: Wheat Ridge Code Of Ordinances, §26-646 · ordinance text retrieved 2026-08-25, re-verified September 2026 · open “the ordinance text” under any figure to read the exact sentence it comes from.
Wheat Ridge’s size cap is conditional rather than a single number: 1,000 sq ft, or 50% of the primary dwelling's floor area, whichever is smaller; an attached ADU in a basement or second floor may exceed this cap, up to the area of the first floor of the same structure. — worth reading closely before sizing a unit.
Short-term rental is conditional: Yes, but only as an owner-occupied/partial-home rental; the property owner must continuously occupy either the primary dwelling or the ADU for the duration of the rental.. No extra parking is required for the ADU.
And Wheat Ridge is one of only 30 Colorado jurisdictions certified ADU Supportive, which makes residents eligible for CHFA’s state-backed ADU financing — an interest-rate buydown and credit enhancement offered through participating lenders. Most of the Front Range doesn’t have this lever.
What an ADU adds to the tax bill in Wheat Ridge, and the conservative floor on what it rents for.
Levies: Jefferson County Assessor, 'Tax Authority Information and Reports' — 2025 Tag with Mill Levy All; 2025 Tax Authorities with Mill Levy All; 2024 Tag with Mill Levy and Authorities All (composition cross-check: summing 2025 per-authority mills for this authority set reproduces the 2025 tag total of 88.2390 exactly). Rates: Colorado DOLA, TY2026 — the 10% reduction on the first $700,000 of value applies to the local-government portion, once per property. Rents: HUD Fair Market Rents, huduser.gov.
Two ways to build the same unit in Wheat Ridge. Both figures are all-in — design, permits, foundation, utility connections and installation.
Published Front Range ranges for a comparable one-off build, 2025–26
≈ $2,100–$2,600 / month fully financed
≈ $2,800–$3,500 / month fully financed
Olerra ranges: published all-in project pricing, September 2026 — site preparation, foundation, utility connections and permitting included.
Free and specific to you. Want to go further?
Yes. The Wheat Ridge Code Of Ordinances permits accessory dwelling units (§26-646), subject to the size, height, setback and use rules quoted above from the ordinance text. Wheat Ridge is also an HB24-1152 subject jurisdiction, so since June 30, 2025 state law requires one ADU to be allowed on any lot with a single-family home. Zoning district, lot size and setbacks still decide what fits on a specific lot — the free property check confirms yours.
Yes. An ADU is a new dwelling unit, so Wheat Ridge requires a building permit (plus any zoning or site-plan review the code calls for) before construction starts. Olerra's all-in price includes permitting, and factory-built units are inspected to the same building code as a site-built home.
Per the Wheat Ridge Code Of Ordinances: 1,000 sq ft, or 50% of the primary dwelling's floor area, whichever is smaller; an attached ADU in a basement or second floor may exceed this cap, up to the area of the first floor of the same structure.. Both Olerra Flex Flats — the 490 and the 735 — are designed to fit typical Colorado caps; check the rules table above for the exact ordinance text.
It depends: Yes, but only as an owner-occupied/partial-home rental; the property owner must continuously occupy either the primary dwelling or the ADU for the duration of the rental..
A one-off site build with a general contractor typically runs about $500,000–$650,000 for a ~490 sq ft unit. Olerra's factory-built Flex Flats run $300,000–$365,000 (490) and $420,000–$465,000 (735) all-in — site preparation, foundation, utility connections and permitting included.
Roughly $611 per year for every $100,000 of value the ADU adds, using the local mill levy split across Colorado's TY2026 school (7.05%) and local-government (6.80%) assessment rates.
Same method, each city’s own ordinance. The Colorado hub lists every city, and the statewide ADU calculator covers any Colorado address.
Guides and real Colorado numbers from our team — a fresh pick every couple of weeks, or search for exactly what you need.
How to hire an ADU contractor in Colorado, the questions to ask, the red flags to avoid, how licensing works here, and modular versus site-built compared.
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Planning departments and journalists are welcome to reference this data.
Olerra ADU Cost Calculator — Wheat Ridge, CO. Data updated August 25, 2026. https://www.olerra.com/adu-calculator/wheat-ridge/ <a href="https://www.olerra.com/adu-calculator/wheat-ridge/">Wheat Ridge ADU rules & costs</a> Data as of August 25, 2026, the oldest figure on the page.
Planning estimates, not quotes or legal advice. Rules, fees, levies and rents change — confirm with the city and your lender before committing. Rules data: codified ordinance as of August 25, 2026, re-verified September 2026. Olerra pricing: published all-in project ranges, September 2026. Corrections: sales@olerra.com.
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