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.
La Salle’s real rules, taxes and rents — read from the codified ordinance, every figure sourced and dated. Here: ADUs up to 750 sq ft, a HUD benchmark rent of $1,238/mo for a 1-bed. Run your own numbers below, free.
Read from the La Salle Municipal Code itself — the operative legal text, not a website summary. La Salle 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 | 750 sq ftverified September 2026La Salle Municipal Code §16-293the ordinance textThe accessory dwelling unit may not be larger or taller than the primary residence on the property and shall not be smaller than 500 square feet or larger than 750 square feet. |
| Minimum ADU size | 500 sq ftverified October 2026La Salle Municipal Code §16-293the ordinance text(8) The accessory dwelling unit may not be larger or taller than the primary residence on the property and shall not be smaller than 500 square feet or larger than 750 square feet. |
| Owner occupancy | Applicant must demonstrate residency on the lot at the time of application (one-time eligibility showing); the ordinance does not state an ongoing owner-occupancy requirement after ADU approval.verified September 2026La Salle Municipal Code §16-293the ordinance textEvidence sufficient to demonstrate that the applicant resides on the lot where the accessory dwelling unit is proposed. |
| Short-term rental | Noverified September 2026La Salle Municipal Code §16-293the ordinance textThe accessory dwelling unit shall not be used for short-term rental in any residential district. |
| Extra parking | None beyond the main houseverified September 2026La Salle Municipal Code §16-293the ordinance textNo additional off-street parking is required for construction of an accessory dwelling unit unless all three of the existing conditions exist: a. no existing off-street space usable for the ADU; b. the zoning district required parking for the primary dwelling as of Jan 1, 2024; and c. on-street park |
Source: La Salle Municipal Code, §16-293 · ordinance text retrieved 2026-10-08, re-verified October 2026 · open “the ordinance text” under any figure to read the exact sentence it comes from.
La Salle’s size cap is conditional rather than a single number: 750 — worth reading closely before sizing a unit.
Short-term rental of the ADU is not permitted, so the model here is long-term tenancy or family use. No extra parking is required for the ADU.
Property tax runs lighter than most of the state here: 69.686 mills total in the example tax area (Weld County tax area 0160), about 23% below the median of the Colorado tax areas we track (levies vary by parcel).
What an ADU adds to the tax bill in La Salle, and the federal benchmark for what it rents for.
Levies: Weld County Assessor, 2025 Mill Levy Report (Tax District and Authority Report) — example: Weld County tax area 0160; levies differ between tax areas inside La Salle; 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 La Salle. 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 La Salle, the 490 is below La Salle's 500 sq ft minimum ADU size
≈ $2,800–$3,500 / month fully financed
Fits La Salle’s size rule
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 La Salle Municipal Code permits accessory dwelling units (§16-293), subject to the size, height, setback and use rules quoted above from the ordinance text. La Salle 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 La Salle 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 La Salle Municipal Code: 750 sq ft. The Olerra Flex Flat 490 is below La Salle's 500 sq ft minimum ADU size; the 735 fits under this rule. The free property check confirms what fits on your lot.
No — the ordinance does not permit short-term rental of an ADU here, so plan on long-term tenancy or family use.
Per the ordinance: Applicant must demonstrate residency on the lot at the time of application (one-time eligibility showing); the ordinance does not state an ongoing owner-occupancy requirement after ADU approval.
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 $478 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 — La Salle, CO. Page updated October 9, 2026; rules verified October 2026. https://www.olerra.com/adu-calculator/la-salle/ <a href="https://www.olerra.com/adu-calculator/la-salle/">La Salle 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.
