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ADU / Backyard Cottage in Aurora
Licensed adu / backyard cottage services for Aurora and Arapahoe/Adams County. Build an income-producing unit in your backyard.
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ADU / Backyard Cottage Services in Aurora, Colorado
Autotelic provides professional adu / backyard cottage services throughout Aurora and the surrounding Arapahoe/Adams County area. Accessory dwelling unit construction across the Denver metro — detached new builds, garage conversions, and basement conversions compliant with Colorado HB 24-1152. One veteran-owned design-build team runs the full Denver sequence under a single contract: zoning verification and concept design, municipal zoning and building permit reviews, then construction and inspections through certificate of occupancy. Whether you're in Aurora (Colorado's third-largest city) or nearby communities, our team delivers quality workmanship backed by Colorado licensing and full insurance coverage.
Permits & Licensing
Permits in Aurora
Aurora building permits are issued by the Building Division's Permit Center, which also handles public improvement, sign, and lawn and irrigation permits. Contractor licensing is a City of Aurora requirement, and applications go through the Aurora4Biz.org online portal. Authority: City of Aurora — Building Division (Permit Center).
Permit Thresholds
Aurora permit thresholds
- Code reference
- Permits are generally required for residential remodel work in Aurora, Colorado, per the adopted building codes (primarily the 2021 International Residential Code (IRC) with local amendments in Aurora City Code Chapter 22, Article V), unless specifically exempt.
- Aurora City Code § 22-184 (amending IRC R105.2) exempts only
- one-story detached accessory residential storage sheds, playhouses, or shade structures ≤120 sq ft, not attached to the residence, and not used for vehicle storage.§ 22-184
- Code reference
- Aurora City Code § 22-135 (amending IBC 105.2) has similar limited exemptions for certain small accessory structures, fences ≤7 ft high (plus all chain-link fences), and antennae/towers ≤25 ft high.§ 22-135
- Structural triggers
- Any structural alteration, addition, or work affecting load-bearing elements generally requires a permit under the adopted IRC (see R105 and amendments).
- Use tax (construction materials use tax)
- Prior to permit issuance, a deposit is required based on 3.75% (three and three-fourths percent) applied to 50% of the total estimated cost of the building/construction/reconstruction/alteration/expansion/modification/improvement (or 100% of the total estimated cost of construction materials/
- Code reference
- This is per Aurora City Code § 130-61.§ 130-61.
- Code reference
- All information is based on the Aurora Municipal Code (Chapter 22) and official city resources.
Codes are amended regularly — verify current requirements with City of Aurora — Building Division (Permit Center).
Energy Code
Aurora energy code quick facts
- Code reference
- Aurora, Colorado, has adopted the 2021 International Energy Conservation Code (IECC) as its base energy code (with the Colorado Model Electric Ready and Solar Ready Code also required by state law).
- Code reference
- Aurora is in IECC Climate Zone 5B.
- Code reference
- The adopting provision is Aurora City Code § 22-203 (Code adopted, under Article VI, International Energy Conservation Code).§ 22-203
- Code reference
- Key prescriptive requirements relevant to remodels/additions (drawn from 2021 IECC Table R402.1.2 and related sections for CZ 5B; these apply unless a performance path or other compliance option is used):
- Ceiling/attic insulation
- R-49 (2021 IECC Table R402.1.2, CZ 5B).
- Wood-frame wall insulation
- R-20 or 13 + 5ci (continuous insulation) (2021 IECC Table R402.1.2, CZ 5B).
- Floor insulation (over unconditioned space)
- R-30 (2021 IECC Table R402.1.2, CZ 5B).
- Fenestration (windows)
- Maximum U-factor 0.30 and SHGC 0.40 (2021 IECC Table R402.1.2, CZ 5B).
Codes are amended regularly — verify current requirements with City of Aurora — Building Division (Permit Center).
Zoning & Dimensional Standards
Setback & dimensional standards in Aurora
Zone-district dimensional standards for Aurora, quoted verbatim from the Aurora Unified Development Ordinance. Knowing your lot's district — and its setbacks, height, and coverage limits — is where every feasibility conversation starts.
I-1setback & dimensional standards
| Standard | Requirement |
|---|---|
| Rear Setback (min) | 5 ft. |
Aurora Unified Development Ordinance I-1 setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
I-2setback & dimensional standards
| Standard | Requirement |
|---|---|
| Rear Setback (min) | 5 ft. |
Aurora Unified Development Ordinance I-2 setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
R-1setback & dimensional standards
| Standard | Requirement |
|---|---|
| Lot Area, Single-Family Detached (min) | 6,000 sf. [1] |
| Lot Frontage, Single-Family Detached (min) | Subarea A: 50 ft. Subarea B: 60 ft. |
| Front Setback (min) | 25 ft. [4] |
| Side Interior Setback (min) | 5 ft. [6] |
| Side Setback Abutting Local Street (min) | 12.5 ft. |
| Rear Setback (min) | 20 ft. |
| Building Height (max) | 38 ft. |
Aurora Unified Development Ordinance R-1 setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
R-2setback & dimensional standards
| Standard | Requirement |
|---|---|
| Lot Area, Single-Family Detached (min) | 6,000 sf. [1] |
| Lot Frontage, Single-Family Detached (min) | Subarea A: 50 ft. Subarea B: 60 ft. |
| Front Setback (min) | 20 ft. [4] |
| Side Interior Setback (min) | 5 ft.[6] |
| Side Setback Abutting Local Street (min) | 10 ft. |
| Rear Setback (min) | 15 ft. |
| Building Height (max) | 38 ft. |
Aurora Unified Development Ordinance R-2 setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
R-3setback & dimensional standards
| Standard | Requirement |
|---|---|
| Lot Area, Single-Family Detached (min) | 5,000 sf. |
| Lot Frontage, Single-Family Detached (min) | 50 ft. |
| Front Setback (min) | 15 ft. |
| Side Interior Setback (min) | 5 ft. |
| Side Setback Abutting Local Street (min) | 10 ft. |
| Rear Setback (min) | 10 ft. |
| Building Height (max) | 45 ft.[7] |
Aurora Unified Development Ordinance R-3 setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
R-4setback & dimensional standards
| Standard | Requirement |
|---|---|
| Lot Area, Single-Family Detached (min) | 5,000 sf. |
| Lot Frontage, Single-Family Detached (min) | 50 ft. |
| Front Setback (min) | 12 ft. |
| Side Interior Setback (min) | 5 ft. |
| Side Setback Abutting Local Street (min) | 7.5 ft. |
| Rear Setback (min) | 10 ft. |
| Building Height (max) | 65 ft.[8] |
Aurora Unified Development Ordinance R-4 setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
R-MHsetback & dimensional standards
| Standard | Requirement |
|---|---|
| Lot Area, Single-Family Detached (min) | [2] |
| Front Setback (min) | 15 ft. |
| Side Interior Setback (min) | 5 ft. |
| Side Setback Abutting Local Street (min) | 15 ft. |
| Rear Setback (min) | 8 ft. |
| Building Height (max) | 20 ft.[9] |
Aurora Unified Development Ordinance R-MH setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
R-Rsetback & dimensional standards
| Standard | Requirement |
|---|---|
| Lot Area, Single-Family Detached (min) | 43,560 sf. |
| Lot Frontage, Single-Family Detached (min) | 120 ft. |
| Front Setback (min) | 30 ft. |
| Side Interior Setback (min) | 10 ft. |
| Side Setback Abutting Local Street (min) | 25 ft. |
| Rear Setback (min) | 25 ft. |
| Building Height (max) | 38 ft. |
Aurora Unified Development Ordinance R-R setback standards (146-4.2.2 Table 4.2-1) — effective 2026-02-23 · View the code
Verify current requirements with the jurisdiction — informational reference only. Standards vary by overlay, lot, and use; we confirm the exact rules for your property during feasibility.
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What this covers
Detached or attached accessory dwelling on a Denver lot: foundation or module, envelope, and utility tie-in. Height and massing follow Denver bulk-plane and ADU rules for the zone; confirm with CPD before drawings freeze.
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How the work is coordinated
A municipally licensed Denver general contractor coordinates licensed specialty trades for electrical and plumbing. Denver-metro work is permitted locally. Colorado has no statewide general-contractor license. Cities and counties license general contractors. DORA licenses electrical and plumbing (and similar regulated trades), not general contractors. Autotelic is a municipally licensed Denver general contractor that coordinates licensed specialty trades. Denver building permits run through Community Planning and Development (CPD). Costs are project-specific; no dollar figures.
FAQ
Common questions
Who handles the adu / backyard cottage permits and licensing?
A municipally licensed Denver general contractor coordinates licensed specialty trades. Colorado has no statewide general-contractor license; cities and counties license general contractors. DORA licenses electrical and plumbing, not general contractors.
What is typically in scope for adu / backyard cottage in Denver?
Detached or attached accessory dwelling on a Denver lot: foundation or module, envelope, and utility tie-in.
When do you need drawings or a permit?
Anything that changes structure, occupancy, or regulated electrical or plumbing usually needs a local permit. Denver building permits are reviewed by Community Planning and Development. Confirm the exact trigger with CPD for the address.
Service Area
Serving Aurora and Arapahoe/Adams County
We serve Aurora, CO and all surrounding Denver metro communities. Our team is based in Denver and operates throughout the Front Range, from Castle Rock to Longmont and everywhere in between. Contact us for a free estimate on your Aurora project.
FAQ
Common questions
Is an ADU allowed on my lot?
It depends on your city’s zoning — lot size, setbacks, and parking rules vary across the metro. We run the zoning check as the first step and tell you what your lot supports before you spend money on design.
Do you handle ADU permits and inspections?
Yes — ADU permitting is municipal, and we manage zoning review, permit application, and every inspection through certificate of occupancy.
Detached, attached, or garage conversion — which is right?
Each has different zoning, cost, and site implications. We design all three and recommend based on your lot, budget, and how you plan to use the unit.
What does an ADU cost?
Getting a real answer costs less than most people expect: an ADU feasibility consultation is $350, and the full ADU feasibility package — zoning check, site analysis, and concept direction — is $950, both listed at fixed prices on our booking page. Construction cost depends on the path: garage and basement conversions reuse existing structure, while a detached backyard cottage is new construction from the foundation up. After feasibility we quote the build itself as a fixed-price proposal, so you know the number before work starts.
How long does an ADU project take?
Three phases run in sequence: design (site measure, concept, construction documents), permitting (zoning and building review, which move on the municipality’s calendar), then construction. Conversions generally move faster than detached new builds because the shell and foundation already exist. We lay out the phase-by-phase schedule in your proposal, and you track progress on our operations platform once work starts.
How small a lot can support an ADU?
Smaller than most people assume — many Front Range single-unit lots that owners write off can carry a detached unit, and each city sets its own minimum lot size, setbacks, and building coverage. Whether your district’s standards leave room for a backyard cottage — or point you toward a garage or basement conversion instead — is exactly what the feasibility check answers for your address.
What is the ADU permit process?
Two municipal reviews run in order: a zoning review confirming the unit fits your district’s standards, then a building permit review of the construction documents, with inspections during the build and a certificate of occupancy at the end. Colorado HB 24-1152 now requires most Front Range municipalities to allow ADUs on single-unit lots, and we confirm how your city implements it as the first step of feasibility.
How It Runs
01
Survey
02
Design
03
Build
04
Verify
DESIGN SERVICES
Discovery & Site Analysis
Needs + preference programming, site survey, as-built documentation, feasibility.
We walk, measure, and photograph your property — existing conditions, utilities, structure, and constraints. You get the as-built documentation and feasibility read that every later decision rests on.
Learn more →Concept Design & Space Planning
Schematic design, floor plan studies, layout options.
Your scope becomes schematic floor plans you can compare side by side — circulation, daylight, adjacencies, and what each option does to the budget. Layout decisions happen on paper, where changes are cheap.
Learn more →Architectural Design & 3D Renderings
Design development, materials + finishes, photorealistic visualization.
The chosen concept resolves into materials, finishes, fixtures, and lighting — with the automation layer drawn in. Photorealistic renderings let you walk the space and adjust before anything is priced.
Learn more →Construction Documents & Permitting
Full CD sets, structural + MEP engineering coordination, permit-ready drawings.
Approved designs become coordinated architectural, structural, and MEP sheets — the set your jurisdiction permits from and trades build from. We submit, track, and answer review comments.
Learn more →CONSTRUCTION
New Construction & Custom Homes
Ground-up homes and light commercial, dirt to keys.
Ground-up residential and light commercial builds — foundations through finishes, including modular and steel construction. One accountable builder from dirt to keys.
Learn more →Remodels & Additions
Kitchens, baths, basements, pop-tops, whole-home.
Kitchens, baths, basements, pop-tops, and whole-home renovations that respect the house you already have. We handle structure, permits, and the dust.
Learn more →Commercial Tenant Finish & Build-Outs
Shells to working spaces — retail, office, restaurant, school.
Raw shells become working spaces — showrooms, offices, restaurants, schools. Dealer-spec finishes, code compliance, and opening dates held.
Learn more →ADUs & Modular Construction
Backyard cottages, garage conversions, factory-built homes.
Backyard cottages, garage conversions, and factory-built homes — zoning, design, permits, and set. Denver’s ADU rules are a specialty, not a surprise.
Learn more →Outdoor Living & Patio Structures
Decks, pergolas, and dining patios built for Colorado weather.
Decks, pergolas, and dining patios engineered for Colorado sun, snow, and hail — structure, shade, and drainage done right the first time.
Learn more →TECHNOLOGY
Smart Home Automation
Lighting, shades, climate, audio, security — one interface.
Whole-home control of lighting, shades, climate, audio, and security from a single interface — Crestron, Lutron, Savant, and Control4 designed in, not bolted on.
Learn more →A/V Systems
Theaters, distributed audio, video walls, commercial sound.
Theaters, distributed audio, video walls, and commercial sound — designed, installed, and tuned by the same team for over 20 years.
Learn more →Control Systems
Custom programming — scenes and schedules that fit the space.
Every subsystem brought into one elegant interface — custom programming for homes and venues, with scenes and schedules that match how the space is actually used.
Learn more →Networking & Edge Compute
Enterprise Wi-Fi, structured cabling, racks, on-prem compute.
Enterprise-grade Wi-Fi, structured cabling, racks, and on-premise compute — the backbone that makes everything else reliable, including our own Barbot platform.
Learn more →Solar & Energy Storage
Solar arrays, Tesla Powerwall, EV charging — certified install.
Solar arrays, Tesla Powerwall, and EV charging designed and installed by a Tesla Energy Certified team — roof, electrical, and app in one scope.
Learn more →TRUSTED TO BUILD FOR
- Punch Bowl SocialFirst four locations
- Spectrum RetirementSenior living communities
- Denver HighlandsFirst modular custom home
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