What is this structure, where may it be used, and what must be verified before buying or moving it?
Identify the actual construction category and intended use before comparing price or floor area. Obtain the structure’s approval and installation documents, then verify the proposed site, use, services and occupancy route with the responsible authorities. Compare the complete delivered and usable option.
Evidence checked October 16, 2026 (America/Denver). Version 1.0. Desk review; no hands-on testing.
What this guide helps you do
For early comparison of a small conventional dwelling, ADU, modular or manufactured structure, with Colorado examples. It does not approve a parcel, RV, chassis-based home, rental use, transport, foundation, utility connection or occupancy.
Describe the use and classify the actual structure
Write whether the need is a permanent home, additional dwelling, shared household space or temporary shelter, and who will use it. Ask the seller for the actual model, manufacturer, construction category, approvals, certification/insignia information and intended installation. Similar size and appearance do not make two structures legally or technically equivalent. Do not infer a dwelling approval from a trailer registration, a marketing phrase or a seller’s assurance that a building is movable.
Keep manufactured-home identity with the unit
HUD’s homeowner resources explain certification labels, data plates, installation/relocation questions and state support routes. Obtain the actual unit’s documents and ask the manufacturer and responsible agency what they establish. Check proposed site conditions and installation requirements before arranging delivery. The general federal page and a Colorado summary use different chassis wording; this guide does not settle exceptions or adopt a universal chassis rule. No label, home, installer or site was individually verified. Source: HUD manufactured-home homeowner resources.
Use the current state program route
Colorado DOH distinguishes mobile, HUD-code, modular and tiny-home categories. Its current materials also point to rules implementing regional factory-built requirements; DOLA’s June 2026 announcement reports a June 30 effective date. Treat that announcement as a version-check signal, then obtain the actual applicable rule and approval documents. The captured consumer/modular pages have rendering diagnostics, although substantive guidance is readable. No particular state approval, construction standard or installation permission was established in this batch. Source: Colorado factory-built home classification navigator.
Match the location and application date to the right authority
First establish whether the site is inside a municipality or in unincorporated county territory. Boulder County’s adopted-code page states that its July 1, 2026 update applies to new permit applications from that date, using 2021 I-Codes and local amendments. A neighboring planning FAQ still cites 2015 IRC; its old edition and room-dimension examples are not used as current specifications here. Ask the responsible officials about the actual use, site, structure, services and permit history. Source: Boulder County adopted-code and amendment history.
Treat an ADU as a use and approval question
The City of Boulder describes an ADU as additional dwelling space with its own kitchen, sleeping and bathroom facilities and routes it through the building-permit process. Its FAQ says a state-approved modular ADU still needs a city building permit. Coordinate current state factory-built construction authority with local siting, service and occupancy questions; this review did not reconcile every sentence of the city FAQ with the new state rules. City guidance does not establish permission on an unincorporated parcel or in another municipality. Source: City of Boulder ADU approval navigator.
Compare a usable home and a workable daily life
Request actual costs for design, delivery, site work, installation, services, approvals and continuing care alongside the structure price. Have the occupants review cooking, bathing, storage, privacy, access and emergency exit needs with the designer. Consider how shared facilities would be governed and maintained. Keep conditions and unresolved approvals visible before signing. A lower purchase price or small floor area alone does not establish affordability, accessibility or a suitable place to live.
A pathway to practice
- Name the need and structure: Use, model, category, documents
- Establish site and authority: Municipality, state program, versions
- Verify usable installation: Approvals, services, access, occupancy
- Compare before committing: Complete costs, daily life, open conditions
Resources and their limitations
HUD manufactured-home homeowner resources
Use it for: Find certification/data-plate, installation, relocation and complaint questions for an actual manufactured home.
Access and cost: Public page freely readable; design, assessment, materials, construction and professional services may cost extra.
How to use it: Read the relevant product and installation headings with the actual certification labels, data plate and manufacturer documents; verify the responsible state and local contacts.
Evaluation and limits: No individual home, certification label, data plate, installer, zoning permission or service outcome checked. HUD’s general permanent-chassis wording and a Colorado summary-table exception were not reconciled; no universal chassis rule is adopted.
Alternatives: Actual manufacturer and state administrative agency; local siting/utility authorities; Colorado classification example.
Open HUD manufactured-home homeowner resources
Colorado factory-built home classification navigator
Use it for: Distinguish mobile, HUD-code, modular and tiny-home program routes.
Access and cost: Public page freely readable; design, assessment, materials, construction and professional services may cost extra.
How to use it: Identify the actual category, approved plans and insignia with DOH. Use its current rule links and coordinate the installation and proposed use with the responsible local authorities.
Evaluation and limits: Consumer and modular pages contain rendering diagnostics but substantive program text remains readable. The June 10, 2026 announcement reports rules taking effect June 30; underlying current rule text and a particular approval were not audited. Table summaries do not replace governing rules. Chassis wording differs from HUD’s general description and is not resolved here.
Alternatives: Current DOH rules and staff; actual manufacturer/approved plans; local planning/building authority.
Open Colorado factory-built home classification navigator
Boulder County adopted-code and amendment history
Use it for: Match application timing and jurisdiction to the stated code and local amendment version.
Access and cost: Public page freely readable; design, assessment, materials, construction and professional services may cost extra.
How to use it: Start with the July 1, 2026 update and Past Building Codes. Obtain the applicable amendment document and ask the building official about the actual proposal and permit history.
Evaluation and limits: Page identifies effective-date routing; linked amendments and model-code text were not fully reviewed. The neighboring planning FAQ still cites 2015 IRC; that is not treated as the current edition for a new application. No local interpretation, vested-rights or parcel decision made.
Alternatives: The actual building official; current state factory-built rules for applicable structures; City of Boulder has its own route.
Open Boulder County adopted-code and amendment history
City of Boulder ADU approval navigator
Use it for: Identify the municipal ADU process, records and questions rather than applying county guidance to a city property.
Access and cost: Public page freely readable; design, assessment, materials, construction and professional services may cost extra.
How to use it: Read Overview and the actual proposal’s FAQ, then inspect current city code and obtain project-specific guidance before purchase or design commitments.
Evaluation and limits: City guidance includes updates and older linked material; no complete ordinance/adoption audit. State/local factory-built construction authority must be coordinated under current rules, not inferred from one FAQ sentence. No zoning, rental eligibility, allowable size or permit approval promised. One Latest News ordinance link is malformed.
Alternatives: Actual city planning/building staff and current ordinance; county route only for unincorporated parcels.
Open City of Boulder ADU approval navigator
Checklist
- Intended use and actual location identified
- Model, category and approval/insignia documents obtained
- Current state and local responsibility routes coordinated
- Applicable code and amendment version confirmed
- Services, installation and occupancy questions resolved for the actual proposal
- Complete costs and occupants’ daily needs compared before commitment
Related guides
Choosing a site and understanding conditions (SG-D08-S01); Building design and space planning (SG-D08-S02); Construction methods and materials (SG-D08-S03); Owner-building and project management (SG-D08-S04); Roofs, foundations and building envelopes (SG-D08-S06); Codes, permits and inspections (SG-D08-S08); Water sources and household needs (SG-D07-S01); Toilets, wastewater and sanitation (SG-D07-S06).
From the Whole Earth registry to current practice
The Wilderness Cabin in Spring 1969 (PDF page 28, printed page 26; WE69S-E054/WE69S-L036) presents alternative shelter and site/tool questions. This visually reviewed historical lead does not establish modern siting, title, construction or occupancy permission. The link to present small-home categories is editorial and current approval routes are sourced separately.
Whole Earth Spring 1969 archive edition
Sources and review notes
No property, model certification, approval, transport, installation, utility capacity, lawful occupancy or actual cost was verified. The planning FAQ’s 2015-code statement is recorded as Needs update against the newer county page. Chassis-summary differences and precise state/local authority require current-rule and project-specific clarification.
