Irontown Modular · Authorized Dealer

Modular ADU Homes in Colorado

Plan your Colorado backyard home with My Cozy Outdoors, your authorized Irontown Modular dealer and direct point of contact. Irontown brings more than 40 years of building experience and is the seller of record.

Designed to the International Residential Code; set on a permanent foundation.
Delivery and crane set included for the first 250 miles; additional miles priced per truckload.
Free zoning guidance with your quote.
10 year limited structural warranty.

Get a Quote and Zoning Guidance See the City and County Rules

Irontown Modular Sledhaus 500 modular ADU

What counts as an ADU in Colorado?

Colorado defines an accessory dwelling unit as an internal, attached or detached unit on the primary home’s lot, with complete independent facilities for living, sleeping, eating, cooking and sanitation. Carriage house, backyard cottage, casita, granny flat, tiny home and prefab ADU are everyday names for the same thing here.

A modular ADU is factory-built to the International Residential Code, the same residential code as a site-built house. Engineered, stamped plans guide construction; a crane sets it on a permanent foundation as real property. A wheeled park model, what Colorado law calls a recreational park trailer, is a different product outside this guide.

Where can you build a Colorado ADU?

Your address determines which rules apply. MCO shares code sections and suggested questions. Confirm zoning, permits, fees and HOA rules with local planning before ordering, and septic and wells with the county.

Start With Local Guidance
This guide is a starting point. MCO helps and advises but takes no responsibility for zoning, permits, impact fees, septic approval or code compliance. Before ordering, you must confirm your parcel, model and use with city or county planning and building offices, and septic approval with the health department. We strongly recommend contacting those offices. MCO can share the code sections it found and suggest questions.

The state framework: C.R.S. 29-35-403

One statute binds “subject jurisdictions”: cities and towns with 1,000 or more people inside a metropolitan planning organization, and county land within a census designated place of 40,000 or more inside one. Mountain and western towns and most county land follow local codes.

Since June 30, 2025, 66 cities and towns across five metropolitan planning regions plus Douglas County’s Highlands Ranch must administratively allow one ADU per detached house without hearings.
Subject jurisdictions must allow 500 to 750 sq ft. Smaller or larger sizes, house-size caps, heights and stories remain local choices (29-35-402(18), 29-35-403(3)(c)).
Side setbacks cannot exceed the house’s; rear setbacks cannot exceed 5 ft or the accessory-building setback if larger. Larger lot minimums and stricter design rules are prohibited (29-35-402(18)).
Owner occupancy is limited to application residency proof or short-term rental licensing. New parking is barred except a narrow case with no off-street parking and prohibited street parking.
Factory-built ADUs face no stricter design or size standards; statewide, factory-built structures face no stricter size, floor-space, foundation, setback, side-yard rules than site-built homes since 2025 (30-28-115(3)(b)(I.5), 31-23-301(5)(b)(I.5)).
Local controls remain: building, fire, utility, stormwater, impact fees, short-term rentals, provider capacity statements. Water, sewer, well capacity, qualifying historic property and floodplain exemptions apply (29-35-403).

ADU rules inside city limits

The listed Denver-area, northern Front Range, Colorado Springs-area, Pueblo and Grand Junction cities are subject jurisdictions. Estes Park and the other mountain and western towns follow their own codes. These summaries reflect the rules read in September 2026.

City	Detached ADU	What the local rule says
Denver	Allowed with conditions	Caps are 864 or 1,000 sq ft by lot size. Application residency applies. Ask about Rabbit 1000 and 17 or 24 ft heights. 11.8.2. Phone 720-865-2700.
Aurora	Ask first	146-3.3.6.G caps units at 650 sq ft and requires owner occupancy on qualifying alley lots; ask how state law applies during the rewrite. Phone 303-739-7420.
Lakewood	Allowed with conditions	17.4.3.1.A caps units at 1,400 sq ft and accessory buildings at 10 percent of your lot, requiring owner occupancy; ask after repeal. Phone 303-987-7500.
Arvada	Allowed with conditions	5-1-5-2 allows 600 to 1,200 sq ft by lot size, never over 40 percent of your house; ask which owner-occupancy rule applies. Phone 720-898-7435.
Westminster	Allowed with conditions	Allows 750 sq ft; caps at lesser of 1,200 sq ft or 50 percent. Ask about Rabbit 1000 and house or 25 ft heights. 11-4-19. Phone 303-658-2092.
Thornton	Allowed with conditions	Caps start at 1,000 sq ft. Owner occupancy applies. Ask about modular eligibility. Outside RE, 16 ft blocks the two-story Rabbit 1000. 18-339. Phone 303-538-7295.
Centennial	Allowed with conditions	12-3-603(H) caps units at 50 percent of your house footprint; ask about the 17 ft height cap ruling out two-story Rabbit 1000. Phone 303-754-3321.
Boulder	Allowed with conditions	Caps are 800 sq ft, 1,000 for affordable or landmark units. Ask about Morada 800 measurement. Standard 20 ft blocks the two-story Rabbit 1000. 9-6-3(n). Phone 303-441-1880.
Longmont	Allowed with conditions	15.02.080.E allows 800 sq ft, or larger below 50 percent of your house, with a 500 sq ft minimum, so ask about the 497 sq ft plans. Phone 303-651-8330.
Broomfield	Allowed with conditions	17-32-160 caps units at 800 sq ft or 50 percent of your house footprint if less, with 500 sq ft always allowed. Phone 303-469-3301.
Littleton	Allowed with conditions	10-1-1.7 caps units at 1,000 sq ft or your house’s area if smaller; ask about Rabbit 1000 exceeding this by 2 sq ft. Phone 303-734-8076.
Castle Rock	Allowed with conditions	17.61.050.C.8 caps footprints at 800 sq ft, requiring owner residency at application; ask whether Rabbit 1000 clears the 20 ft accessory height. Phone 720-733-3527.
Parker	Ask first	13.05.050(d)(1) prohibits ADUs, with no local size cap or permit route; ask how the town applies the conflicting state law to your property. Phone 303-841-0353.
Fort Collins	Allowed with conditions	Allows 750 sq ft for smaller houses; otherwise, lesser of 1,000 sq ft or 45 percent. 1.5 stories block the two-story Rabbit 1000. 3.1.9. Phone 970-416-4311.
Loveland	Allowed	18.04.07.01 caps units at 900 sq ft, allowing 50 percent of your house in qualifying large-lot districts; you do not need to live onsite. Phone 970-962-2000.
Greeley	Allowed with conditions	24-403(b) caps units at 1,200 sq ft, 60 percent of house living area and 50 percent of its footprint; 9 ft walls rule out two-story Rabbit 1000. Phone 970-350-9780.
Estes Park	Allowed with conditions	5.2.B.2.a(8) caps units at 800 sq ft or 49 percent of your house if less; smaller lots need additional approval. Phone 970-577-3721.
Colorado Springs	Allowed with conditions	Caps reach 1,250 sq ft or 50 percent; 750 always allowed. Application residency applies. Ask: 16 ft blocks the two-story Rabbit 1000. 7.3.304E. Phone 719-385-5905.
Pueblo	Allowed with conditions	17-4-16 caps units at 800 sq ft or your house’s size if smaller; you must live on the lot when applying. Phone 719-553-2259.
Monument	Allowed with conditions	LLR allows 500 to 1,250 sq ft. Application residency applies. Ask about 497 sq ft. 16 ft blocks the two-story Rabbit 1000. 18.03.340.D. Phone 719-884-8015.
Woodland Park	Ask first	18.33.135 allows 300 to 800 sq ft, capped at 40 percent of your house, requiring owner occupancy; ask how state law allows free-standing units. Phone 719-687-5202.
Salida	Allowed	16-3-30(f)(1) caps units at 1,000 sq ft through 16 ft height, 800 above, always smaller than your house; you need not live onsite. Phone 719-539-4555.
Buena Vista	Allowed with conditions	3.3.4.A caps units at 850 sq ft, always smaller than your house; you need not live onsite, but exterior design must match. Phone 719-581-1166.
Breckenridge	Allowed with conditions	Policy 51A sets no size cap beyond being smaller than your house; ask about remaining density under Policy 3 and points review. Phone 970-453-3160.
Steamboat Springs	Allowed with conditions	306.D.3 caps units at 650 sq ft of net floor area; you need a limited use permit and cannot offer short-term rentals. Phone 970-879-2060.
Grand Junction	Allowed with conditions	The toolkit cites 21.04.040(e)(1)(i), capping units at 900 sq ft behind your house; you need planning clearance and a licensed general contractor. Phone 970-244-1430.
Montrose	Allowed with conditions	Sec. 11-11-5 caps units at 1,000 sq ft net; ask whether Rabbit 1000 fits that measurement and whether your zone requires hearings. Phone 970-240-1407.
Durango	Allowed with conditions	2-3-2-3 caps units at 550 sq ft and requires owner occupancy; ask about plate heights of 13 ft 6 in, or 11 ft 6 in in RL. Phone 970-375-4850.
Glenwood Springs	Allowed with conditions	070.030.040(d)(1) caps units at 1,000 sq ft or 55 percent of your house if less; ask for current water and wastewater fees. Phone 970-384-6450.
Carbondale	Allowed with conditions	Allows 500 sq ft for smaller houses; otherwise, lesser of 850 sq ft or 33 percent. Ask about April’s reported rewrite. 4.4.4.A. Phone 970-510-1248.
Pagosa Springs	Allowed with conditions	4.3.4.A caps units at 800 sq ft or 75 percent of your house if less; shared utilities generally apply, without owner occupancy. Phone 970-585-8610.

ADU rules on unincorporated county land

The state ADU law binds county land only inside Douglas County’s Highlands Ranch area. Everywhere else, the county’s own code decides. Most counties require water and septic capacity for the added dwelling. A well-served lot needs the well question answered first.

County (unincorporated)	Detached ADU	What the local rule says
Jefferson County Evergreen, Conifer, Ken Caryl, Columbine, Coal Creek Canyon	Allowed with conditions	Sec. 19 D allows 600 to 1,200 sq ft by lot size, capped at 40 percent of house. Owner occupancy, well and septic permits apply. Phone 303-271-8700.
Arapahoe County Byers, Strasburg, Watkins, county islands near Centennial and Aurora	Allowed with conditions	Allows 600 to 1,200 sq ft, capped at 40 percent. Owner occupancy applies. The 22 ft ridge cap blocks the two-story Rabbit 1000. 3-3.2.D. Phone 720-874-6711.
Adams County Sherrelwood, Welby, Henderson, Strasburg, Watkins	Allowed with conditions	Allows 500 to 1,500 sq ft. Ask about 497 sq ft. Provider approval or adequate well and septic permits apply. 4-03-03-02-01. Phone 720-523-6800.
Douglas County Highlands Ranch, Franktown, Sedalia, Perry Park, Roxborough, rural A-1 and ER lots	Allowed with conditions	No size cap. Detached units need one acre with central water, two with wells. Ask about Highlands Ranch’s state law. 1-303 through 1-703. Phone 303-660-7460.
Boulder County Gunbarrel, Niwot, Eldorado Springs, mountain and plains parcels	Ask first	Sec. 4-516.H caps family-care units at 700 sq ft with owner occupancy, agricultural-worker units at 1,800; both need special review, so ask after the rewrite. Phone 303-441-3930.
Weld County rural lots near Greeley, Windsor, Johnstown, Fort Lupton, Hudson, Keenesburg	Allowed with conditions	Sec. 23-4-600 sets no size cap or owner occupancy; residential zones need public water and sewer, agricultural lots 2.5 acres without public water. Phone 970-400-6100.
Larimer County LaPorte, Bellvue, Red Feather Lakes, Livermore, Masonville, Drake, Glen Haven	Allowed with conditions	Allows 900 to 1,200 sq ft by lot size; 75 percent maximum, 750 sq ft always allowed. Provider or well form required. 3.4.5.A. Phone 970-498-7683.
El Paso County Falcon, Peyton, Black Forest, Ellicott, Security-Widefield, Cimarron Hills	Ask first	Sec. 5.2.1 caps guest quarters at 1,500 sq ft without rent; family occupancy needs special use, rentals need a variance, so ask about the rewrite. Phone 719-520-6300.
Pueblo County Pueblo West, Colorado City, Rye, Beulah, Avondale, St. Charles Mesa	Allowed	Caps rise from 900 to 2,000 sq ft; 60 percent applies. Above 35 acres, uncapped. 500 sq ft always allowed. No owner occupancy required. 17.03.040(c). Phone 719-583-6000.
Teller County Divide, Florissant, Lake George, Guffey	Ask first	Secs. 2.5.B.7 and 2.6.1.B require qualifying A-1 parcels of 35 acres, with no stated size cap; your well and septic need Environmental Health approval. Phone 719-687-3048.
Mesa County Clifton, Fruitvale, Orchard Mesa, Redlands, Loma	Allowed with conditions	Allows 900 or 1,200 sq ft by lot size; above one acre, 1,500 sq ft or 50 percent. Septic review comes first. 6.04 E. Phone 970-255-7169.
Garfield County Battlement Mesa, Missouri Heights, Silt Mesa, Divide Creek	Allowed	7-701 caps units at 1,200 sq ft without owner occupancy; water and septic capacity are required, so ask about Rabbit 1000 against 25 ft height. Phone 970-945-8212.
Eagle County Edwards, Eagle-Vail, El Jebel, Wolcott	Allowed with conditions	R, RL, AR allow detached units capped respectively at 1,800, 1,200, 1,000 sq ft. Water, sewer, fire service required. Ask about garage-integrated units elsewhere. 3-310.A. Phone 970-328-8600.
La Plata County Animas Valley, Hesperus, Forest Lakes, Vallecito	Allowed with conditions	Sec. 73-3 caps director determinations at 2,000 sq ft or your house’s size if smaller; shared utilities and access qualify, with approved water and septic capacity. Phone 970-382-6263.
Archuleta County Pagosa Lakes, Aspen Springs, Arboles	Allowed with conditions	2.1.2.5 sets no size cap but requires 3 acres in qualifying districts and water and septic capacity; ask about smaller lots. Phone 970-264-8386.
Montrose County Spring Creek, the Uncompahgre valley, Nucla, Naturita	Allowed with conditions	Sec. III.C.2.a caps units below one acre outside agriculture at 1,100 sq ft, otherwise uncapped; water and wastewater proof apply, and septic requires one acre. Phone 970-249-6688.
Summit County Blue River, Peak 7, Summit Cove, Dillon Valley, Wildernest, Lower Blue	Allowed with conditions	Sec. 3809.03 caps units at 1,000 sq ft below 5 acres, 1,400 otherwise; one dwelling needs a workforce rental covenant, and wells require augmentation. Phone 970-668-4200.
Routt County Stagecoach, Clark, Milner, Phippsburg, Steamboat outskirts	Allowed with conditions	Sec. 2.43 caps units at 850 sq ft for one bedroom, 1,000 for more; lots under 5 acres need central water and sewer. Phone 970-879-2704.
Chaffee County Nathrop, Johnson Village, Maysville, Chalk Creek, Cottonwood, Salida and Buena Vista outskirts	Allowed with conditions	Sec. 2.3.3.4 caps units at 1,500 sq ft in AR and RR, 1,000 elsewhere, never larger than your house; water and wastewater capacity apply. Phone 719-530-5630.
Park County Bailey, Jefferson, Como, Hartsel, Lake George, Guffey and the rural subdivisions	Ask first	Sec. 5-714(B) allows ADUs on 2 acres with no posted size cap; ask about height, occupancy and process, and obtain Environmental Health approval for septic. Phone 719-836-4292.
Gunnison County Crested Butte South, Skyland, Almont, Ohio City, Somerset, Gunnison outskirts	Allowed with conditions	Sec. 9-101 sets no size cap beyond being smaller than your house; share well and septic where feasible, with one acre required for septic. Phone 970-641-0360.
Grand County Tabernash, Winter Park Highlands, Pole Creek, Columbine Lake, Parshall, Grand Lake area	Allowed with conditions	Caps at lesser of 1,500 sq ft or 50 percent of house. Detached units require central water in growth areas and adequate wastewater capacity. 13.1.2.g. Phone 970-725-3255.
Pitkin County Woody Creek, Old Snowmass, Brush Creek, Redstone, Emma, Castle Creek and Maroon Creek	Allowed with conditions	Caps at 700 sq ft below 30,000 sq ft lots, 1,000 otherwise. Detached units require hearings and employee or family occupancy. Ask about height. 4-30-50(e). Phone 970-429-6108.

State law requires listed subject jurisdictions to allow detached ADUs on qualifying parcels. Except Loveland, every subject jurisdiction we read adds conditions. Aurora, Parker and Woodland Park have not updated their codes, so ask how they apply state law. Ask Boulder County, El Paso County, Teller County and Park County, which lack general ADU routes. Grand Junction’s code text could not be read.

Ask About My Lot

How big can your ADU be?

Subject jurisdictions must allow the 500 to 750 sq ft band. Smaller and larger units, house-size limits, height and stories remain local. Local caps include 750, 800, 900, 1,000, 1,200 and 1,500 sq ft, or a percentage of your house.

Sledhaus 500 (580 sq ft), Cabana 700 (638 or 718) and Torrey Flats (696) fit the band. Mysa 500 and Cabana 500 are 497 sq ft, needing no 500 sq ft minimum. Morada 800 (793), Morada 1000 (989), Rabbit 1000 (1,002) and Walker (1,165) depend on your local cap.

Plan	Size	Rooms	Footprint
Mysa 500	497 sq ft	1 bed, 1 bath	14 ft x 36 ft
Cabana 500	497 sq ft	1 bed, 1 bath	14 ft x 36 ft
Sledhaus 500	580 sq ft	1 bed, 1 bath	14 ft x 45 ft with deck
Cabana 700	718 sq ft	2 bed, 1 to 2 bath	14 ft 6 in x 49 ft 6 in (638 sq ft, 44 ft with one bath)
Torrey Flats	696 sq ft	1 bed, 1 bath	15 ft x 48 ft
Morada 800	793 sq ft	1 to 2 bed, 1 to 2 bath	39 ft x 21 ft
Morada 1000	989 sq ft	1 to 2 bed, 1 to 2 bath	43 ft x 24 ft
Rabbit 1000	1,002 sq ft	2 bed, 2 bath	34 ft 8 in x 14 ft 6 in, two story
Walker	1,165 sq ft	2 bed, 2 bath	42 ft x 27 ft

Irontown ADU plans and starting prices

These Colorado Multi-State Designer Series starting prices cover plans designed to the International Residential Code. Modern, Balance and Rustic finishes are priced in your quote.

Mysa 500

497 sq ft · 1 bed, 1 bath · from $142,600

497 sq ft, one bedroom and bath; from $142,600.

See the Mysa 500 plan

Cabana 500

497 sq ft · 1 bed, 1 bath · from $184,400

497 sq ft, one bedroom, modern sloped roof; from $184,400.

See the Cabana 500 plan

Sledhaus 500

580 sq ft · 1 bed, 1 bath · from $179,300

580 sq ft, one bedroom, included front deck; from $179,300.

See the Sledhaus 500 plan

Cabana 700

718 sq ft · 2 bed, 1 to 2 bath · from $176,200

638 or 718 sq ft, two bedrooms; from $176,200.

See the Cabana 700 plan

Torrey Flats

696 sq ft · 1 bed, 1 bath · from $193,700

696 sq ft, one bedroom, open kitchen and living space; from $193,700.

See the Torrey Flats plan

Morada 800

793 sq ft · 1 to 2 bed, 1 to 2 bath · from $242,400

793 sq ft, flexible one-bedroom or two-bedroom layouts; from $242,400.

See the Morada 800 plan

Morada 1000

989 sq ft · 1 to 2 bed, 1 to 2 bath · from $247,700

989 sq ft, flexible bedrooms and optional second bath; from $247,700.

See the Morada 1000 plan

Rabbit 1000

1,002 sq ft · 2 bed, 2 bath · from $239,400

1,002 sq ft, two stories, two bedrooms, upstairs deck; from $239,400.

See the Rabbit 1000 plan

Walker

1,165 sq ft · 2 bed, 2 bath · from $276,800

1,165 sq ft, two bedrooms, two baths, porch; from $276,800.

See the Walker plan

Home price and delivery to Colorado

The Multi-State starting price includes Designer finishes, module delivery, standard crane and set for the first 250 miles from Spanish Fork. Grand Junction, Fruita and Palisade are inside that allowance. Most other Colorado destinations are beyond it: approximately $900 extra per load to Glenwood Springs, $2,900 to Denver and $3,700 to Colorado Springs.

Nearest townPlanTruckloads (estimated)

Approximate road miles from the factory

Estimated delivery beyond the 250 included miles

Starting price, delivered and set, plus estimated extra miles

Estimate only. Multi-State Designer Series starting price with standard delivery and crane set. Beyond 250 miles the rate is $12.75 per mile per truckload; plans wider than about 15 ft and two-story plans usually ship as two modules, and your quote confirms the count. Foundation, site work, stitch, utilities, permits, fees, engineering, pilot cars and sales tax are not included.

Beyond 250 miles, transportation costs $12.75 per mile per truckload, plus any required pilot car. Single-module plans take one load; bigger plans arrive as two modules on two trucks, stitched on your foundation. Use the calculator’s truckloads selector. Your written quote confirms loads, pricing, finishes, transportation and tax treatment.

Costs not in the home price

These additional costs come on top of the home price and are quoted by your general contractor, city and county, not MCO.

Site work and grading
Engineered foundation and site engineering
Utility trenches, connections and septic work
Module stitch and finishing
Steps, porches, decks and landscaping
Permits and plan review
Impact, tap, plant investment and school fees
Applicable sales and use taxes
Transport touch-ups and minor cosmetic adjustments

Impact fees remain local; no state rule exempts ADUs from impact, tap or plant investment fees. Reductions include Loveland through 900 sq ft, Boulder’s affordable housing fee, Westminster and Summit County workforce-covenant permit fees. Longmont, Fort Collins, Castle Rock and Durango charge new-unit fees. Published examples: Longmont impact fees $925 plus $582.58 through 800 sq ft; Castle Rock about $14,700 plus stormwater. Ask your city or county which fees an ADU pays.

Since January 1, 2025, Colorado law exempts a modular home built to the Division of Housing‘s codes from state sales and use tax (39-26-721). Most city and county sales taxes and home-rule city taxes are not covered. Whether your purchase qualifies and which local taxes apply at your address depend on the transaction and appear on your written quote. Your county assessor sets the ADU’s added property value.

Living in or renting your ADU

Subject jurisdictions cannot require owner occupancy beyond application residency proof or short-term rental licensing. Long-term rental is unrestricted by statute; short-term rules are local. Boulder, Longmont, Broomfield, Centennial, Fort Collins, Estes Park and Glenwood Springs bar ADU short-term rentals. In subject jurisdictions, HOAs cannot block ADUs beyond reasonable restrictions (38-33.3-106.5).

Elsewhere, local codes decide. Durango, Jefferson and Arapahoe counties require owner occupancy; Lakewood, Arvada and Thornton still require owner occupancy in their codes, so ask which rule applies. Summit and Pitkin counties impose workforce or employee covenants. Many places prohibit separate sale. Read your HOA declaration before ordering; reasonable restrictions can remain.

Factory approval and local permits

Irontown is a registered factory-built manufacturer with the Colorado Division of Housing. Colorado modules undergo state review; feasibility confirms site loads and plan approval.

Reviews take Lakewood 15 days, Grand Junction 2 to 3 weeks, Arvada about 3 weeks, Westminster up to 4 weeks.
Irontown supplies stamped, engineered plans designed for your site’s snow load, wind and wildfire zone.
The Division or authorized third-party agency approves plans and inspects factory work; each module carries the Division’s insignia of approval.
Local building departments permit and inspect foundations, utilities, set and stitch without duplicating state factory review (24-32-3311).
Complete applicable septic, well, wildfire-code and HOA steps; local agencies set their timing.

Irontown’s three project phases

Irontown gives these phase durations as its goals. Local permit review adds time, and site or building delays can affect the schedule. Your city and contractor set timings for their work.

Phase 1 Feasibility Review (1 to 2 weeks). $2,000 credited to your final contract; includes virtual site and route review, budget, schedule, building requirements and contractor support.
Phase 2 Pre-construction Agreement (2 to 3 months). Site visit, detailed planning, limited customization, site design loads, interior selections and stamped engineered permit plans.
Phase 3 Construction and Delivery (12 to 16 weeks). Irontown builds, ships and sets your modules, with communication about permit, building or site delays.

Six steps at your property

Your general contractor handles the on-site work and coordinates with Irontown. These steps have no fixed published durations.

Prepare and coordinate. Evaluate and prepare the site, obtain permits and coordinate delivery with Irontown.
Build foundation and utilities. Build the engineered foundation and install water, sewer, electrical and gas connections.
Receive and set modules. Prepare access, inspect arriving modules and coordinate crane placement on the foundation.
Join and finish. Connect modules, weatherproof seams, finish surfaces and connect and test building systems.
Inspect and hand over. Complete inspections, system testing, punch list and walkthrough; hand over documents and keys.
Support after move-in. Address warranty issues and help arrange maintenance schedules if wanted.

Your general contractor handles the site

A licensed general contractor is required for on-site work and prices it separately from your home. Irontown has connections to some general contractors; contact MCO to see whether we can recommend one for your area. Irontown’s feasibility review includes contractor support.

Are you a general contractor building ADUs for clients? Email support@mycozyoutdoors.com to join the MCO contractor network.

How to order your Colorado ADU

Choose a plan. Share your address, intended use and finish preferences with MCO.
Request pricing. Receive a written quote and free zoning guidance sharing the local rules we found.
Confirm locally. Confirm zoning, permits, fees and HOA rules with local planning before ordering, and septic and wells with the county.
Start feasibility. Review your site, delivery route, budget and contractor needs with Irontown.
Finalize your project. Complete pre-construction selections and agreements, then coordinate permits, site preparation, construction and delivery.

Visit the Spanish Fork factory

Visit Irontown’s factory in Spanish Fork, Utah, about an hour south of Salt Lake City International Airport, with direct flights from Denver International Airport. Walk finished modules on the line and see the finish series.

Schedule a Factory Visit

Common Questions

Does my city have to allow a detached ADU?

Subject jurisdictions must allow one through administrative approval with a detached house on qualifying parcels. Exempt parcels and local standards still matter. Mountain and western towns outside those jurisdictions follow their own codes; a state rule is not a permit.

How big can my ADU be?

Subject jurisdictions must allow the 500 to 750 sq ft band. Smaller and larger units depend on local rules, sometimes tied to house size. Height remains local. The 497 sq ft plans need a code that accepts units below 500.

Can I rent it out, and must I live on the property?

Subject jurisdictions cannot require you to live onsite beyond application residency proof or short-term rental licensing; statute leaves long-term rentals unrestricted. Some codes disagree, so ask. Elsewhere, owner occupancy or workforce covenants may apply. Short-term rental rules are local.

What does an ADU cost all in?

There is no single published total. Add your general contractor’s site-work quote, local fees and applicable taxes to the home and transportation price. The home quote includes delivery and standard crane set for the first 250 miles.

How long does it take?

Irontown lists 1 to 2 weeks for feasibility, 2 to 3 months for pre-construction and 12 to 16 weeks for construction and delivery. Local permit review adds time. Site readiness, agency reviews and building delays can change the schedule.

Do I need a general contractor?

Yes. A licensed general contractor handles the foundation, utilities, set-day coordination, stitch and finishing, priced separately. Contact MCO to see whether Irontown’s contractor connections include someone for your area. Feasibility includes contractor support.

Rules were read in September 2026. This summary is not legal advice or approval; rules change and local offices decide their application. MCO takes no responsibility for zoning, permits, impact fees, septic approval or code compliance. You are responsible for confirming these matters with city or county planning and building offices and the health department for septic, and obtaining required permits before ordering. MCO strongly recommends contacting those offices and can share code sections and suggested questions.