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.
Superior’s real rules, taxes and rents — read from the codified ordinance, every figure sourced and dated. Here: a HUD benchmark rent of $1,795/mo for a 1-bed. Run your own numbers below, free.
Read from the Superior Municipal Code itself — the operative legal text, not a website summary. Superior is an HB24-1152 subject jurisdiction: since June 30, 2025, state law requires it to allow an ADU wherever it allows a single-family home, with administrative approval — the local standards below still apply.
| Maximum ADU size | The larger of 750 sq ft or 50% of the principal dwelling unit's square footage, but never more than the principal dwelling unit's square footage.verified October 2026Superior Municipal Code §16-6-160the ordinance textThe ADU shall be no larger than fifty percent (50%) of the square feet of the principal dwelling unit or 750 square feet, whichever is larger. In no event shall the ADU exceed the square footage of the principal dwelling unit. |
| Height limit | Detached ADU: the maximum height allowed for the principal dwelling unit in the zone, capped at 32 ft (whichever is less). Attached or internal ADU: the maximum height allowed for the principal dwelling unit.verified October 2026Superior Municipal Code §16-6-160the ordinance textMaximum height (attached or internal) | Equivalent to the maximum height allowed for the principal dwelling unit | Maximum height (detached) | Equivalent to the maximum height allowed for the principal dwelling unit or 32,' whichever is less |
| Owner occupancy | Yes, but only as of the date the ADU permit application is filed (not a continuing occupancy requirement); the requirement does not apply when the ADU is built on a vacant lot.verified September 2026Superior Municipal Code §16-6-160the ordinance textThe property owner shall reside on the property on the date an application is filed to construct an ADU; provided, however, this requirement does not apply to the construction of an ADU on a vacant lot. |
| Short-term rental | Conditional: only with a Town short-term rental license, and only if Superior is the owner's principal residence; the main home and the ADU can't both be short-term rentals at once, and an owner may run only one (rentals under 30 days)verified October 2026Festival exception (§6-10-110): for Town-declared festival periods only (plus 10 days before and after, at most 29 days per festival), a limited festival license drops the principal-residence requirement and the one-rental-per-owner limit; two short-term rentals in the same dwelling unit stay prohibited. Year-round short-term rentals need the regular license.Superior Municipal Code §6-10-30the ordinance textShort-term rental means a residential dwelling unit, or any room therein, or a permitted accessory dwelling unit available for lease for a term of less than thirty (30) consecutive days, excluding bed and breakfasts and accommodation units. | A current, valid license is required for each short-term rental in the Town. | An affidavit, signed by the owner, under penalty of perjury, certifying ... that the owner's principal place of residence is in the Town | Multiple short-term rentals on the same lot or parcel of real property are prohibited. This limitation applies to two (2) or more short-term rentals operating within the same dwelling unit at the same time, or within a dwelling unit and an accessory dwelling unit at the same time. | An owner of a short-term rental shall only operate a single short-term rental in the Town. |
| Extra parking | None beyond the main houseverified September 2026Superior Municipal Code §16-6-160the ordinance textParking. Off-street parking is not required. |
| Setbacks | Rear: accessory-structure rear setback for the zone district (5 ft if none stated) for detached ADUs; for attached/internal ADUs, the portion of the structure containing the principal dwelling unit must meet the principal-structure rear setback instead. Front and side (interior and street) setbacks follow the principal dwelling unit's setbacks.verified September 2026Superior Municipal Code §16-6-160the ordinance textRear setback Equivalent to the rear setback allowed for accessory structures. If none is stated, then 5'. If the ADU is attached or internal to the principal dwelling, the portion of the structure that contains the principal dwelling unit must maintain the rear setback for principal structures. Front setback Equivalent to the front setback allowed for the principal dwelling unit. Side setback (internal lot line) Side setback (internal) of principal dwelling unit. Side setback (street side) Side setback (street side) of principal dwelling unit. |
| Water & sewer service | Must be connected to the main home's water and wastewater utilities and may not have separate connections, unless the Town or the applicable district approves separate connections in writing.verified October 2026Superior Municipal Code §16-6-160the ordinance textUtility service. ADUs shall be connected to the water and wastewater utilities of the principal dwelling unit and may not have separate connections, unless the Town or applicable district approves of separate connections in writing. |
Source: Superior Municipal Code, §16-6-160 · ordinance text retrieved 2026-08-25, re-verified October 2026 · open “the ordinance text” under any figure to read the exact sentence it comes from.
Superior’s size cap is conditional rather than a single number: The larger of 750 sq ft or 50% of the principal dwelling unit's square footage, but never more than the principal dwelling unit's square footage. — worth reading closely before sizing a unit.
Owner occupancy: Yes, but only as of the date the ADU permit application is filed (not a continuing occupancy requirement); the requirement does not apply when the ADU is built on a vacant lot.
Short-term rental is conditional: only with a Town short-term rental license, and only if Superior is the owner's principal residence; the main home and the ADU can't both be short-term rentals at once, and an owner may run only one (rentals under 30 days). No extra parking is required for the ADU.
Property tax runs heavier than most of the state here: 104.969 mills total in the example tax area (Boulder County tax areas 001447 / 001434), about 17% above the median of the Colorado tax areas we track (levies vary by parcel).
And Superior 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 Superior, and the federal benchmark for what it rents for.
Levies: Boulder County Assessor CamaView per-parcel property/tax records (live ArcGIS REST feature services -- CamaView/ParcelPropertyView and CamaView/PropSearch_TAXES at maps.bouldercounty.org -- which are the county's own data source behind its public 'Property Search' tool at https://maps.bouldercounty.org/boco/PropertySearch/); cross-checked against Boulder County Assessor 'Mill Levy Changes 2024 to 2025' workbook (Changes_by_Tax_Area / Changes_by_Authority sheets) — example: Boulder County tax areas 001447 / 001434; levies differ between tax areas inside Superior; check your parcel with the county assessor. 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 Superior. 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
In Superior, the 490 fits if the main home is at least 490 sq ft
≈ $2,800–$3,500 / month fully financed
In Superior, the 735 fits if the main home is at least 735 sq ft
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 Superior Municipal Code permits accessory dwelling units (§16-6-160), subject to the size, height, setback and use rules quoted above from the ordinance text. Superior is also an HB24-1152 subject jurisdiction, so since June 30, 2025 state law requires it to allow an ADU wherever it allows a single-family home, with administrative approval; the local standards above still apply. 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 Superior 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 Superior Municipal Code: The larger of 750 sq ft or 50% of the principal dwelling unit's square footage, but never more than the principal dwelling unit's square footage. The Olerra Flex Flat 490 fits if the main home is at least 490 sq ft; the 735 fits if the main home is at least 735 sq ft. The free property check confirms what fits on your lot.
It depends: Only with a Town short-term rental license, and only if Superior is the owner's principal residence; the main home and the ADU can't both be short-term rentals at once, and an owner may run only one (rentals under 30 days). Festival exception (§6-10-110): for Town-declared festival periods only (plus 10 days before and after, at most 29 days per festival), a limited festival license drops the principal-residence requirement and the one-rental-per-owner limit; two short-term rentals in the same dwelling unit stay prohibited. Year-round short-term rentals need the regular license.
Per the ordinance: Yes, but only as of the date the ADU permit application is filed (not a continuing occupancy requirement); the requirement does not apply when the ADU is built on a vacant lot.
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 $726 per year for every $100,000 of value the ADU adds, in the example tax area shown above: Colorado's TY2026 school (7.05%) and local-government (6.80%) assessment rates on the latest certified (TY2025) levy, a mixed-year estimate. Levies differ between tax areas, so check your parcel with the county assessor.
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.
Latest articles
Planning departments and journalists are welcome to reference this data.
Olerra ADU Cost Calculator — Superior, CO. Page updated October 9, 2026; rules verified October 2026. https://www.olerra.com/adu-calculator/superior/ <a href="https://www.olerra.com/adu-calculator/superior/">Superior ADU rules & costs</a> Page updated October 9, 2026. The oldest dated figure on the page is from August 25, 2026.
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 October 2026. Olerra pricing: published all-in project ranges, September 2026. Corrections: sales@olerra.com.
Built for your location and what you want to do.
We'll be in touch before then — a confirmation is on its way to your email.
Thanks — we’ll reply to your email, usually the same day.
Our team is already on it — here’s what happens next.
