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Garage Conversion in Castle Rock
Licensed garage conversion services for Castle Rock and Douglas County. Turn your garage into livable space.
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- Construction & Tenant Finish
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Turn your garage into livable space
EVERY PROJECT STARTS WITH DESIGN
Local Service
Garage Conversion Services in Castle Rock, Colorado
Autotelic provides professional garage conversion services throughout Castle Rock and the surrounding Douglas County area. Garage to living space conversions across the Denver metro — studios, offices, guest suites, and ADUs with full HVAC, insulation, and code-compliant egress. Whether you're in Castle Rock (Douglas County seat) or nearby communities, our team delivers quality workmanship backed by Colorado licensing and full insurance coverage.
Permit Thresholds
Castle Rock permit thresholds
- Code reference
- Exempt work follows the Town’s adopted amendments to the 2024 International Residential Code (IRC) and International Building Code (IBC), per Ordinance No. 2026-017 (effective around June 30, 2026).Ordinance No. 2026-017
- Code reference
- One-story detached accessory non-habitable structures (tool sheds, playhouses, etc.) ≤ 120 sq ft, ≥ 10 ft from the nearest occupiable structure.
- Code reference
- Fences ≤ 6 ft high (swimming pool barriers of any height are *not* exempt).
- Code reference
- Shingle repair or replacement not exceeding one square (100 sq ft) of covering per building.
- Code reference
- The adopted codes (2024 IRC/IBC and related) govern when alterations trigger permitting.
- Code reference
- See Title 15 of the Castle Rock Municipal Code (and amendments in Ordinance 2026-017) for the full adopted code language on work exempt from permit (primarily amending IRC R105.2 and equivalent IBC sections).Ordinance 2026-017
- Building use tax
- 5.2% applied to 50% of the project’s valuation (materials estimated at half the valuation).
- Code reference
- This comprises the Town’s 4.2% use tax rate + Douglas County’s 1% use tax rate.
Codes are amended regularly — verify current requirements with **The Town of Castle Rock Building Division (part of Development Services) issues residential building permits within the town limits.
Zoning & ADU
Castle Rock zoning & ADU quick facts
- Code reference
- R-1 Single-Family Residence District (primary/most common single-family district; Chapter 17.18) and R-2 Single-Family and Duplex Residence District (Chapter 17.22) are the relevant standard single-family zones.
- Max lot/building coverage
- R-1 and R-2 references indicate standards such as 40% building coverage in certain contexts or related districts (e.g., older or specific provisions); exact R-1/R-2 figures not uniformly detailed in accessible summaries without full code access.
- Max building height
- R-1/R-2: Principal buildings 35 feet; accessory buildings/structures (including garages) 20 feet (Chapter 17.22.040 for R-2; consistent descriptions for R-1).
- ADU permitted
- Yes in R-1 and R-2 (and other single-family residential zones/PUDs designated for single-family use), as an accessory use to single-family detached dwellings.
- Code reference
- One ADU per lot; administrative review/building permit (updated per state HB requirements and local Chapter 17.61).
- ADU max size
- Interior/attached ADUs up to 50% of primary dwelling or 750 sq ft (whichever greater); detached ADUs generally ~800 sq ft (per 2025 code update summaries; exact code limits in 17.61).
- Setbacks (R-2 example, consistent with R-1 descriptions)
- Front yard (all buildings) 25 feet; rear yard principal buildings 25 feet, accessory 10 feet; side yard per dwelling 5 feet (accessory buildings 2 feet if in rear one-third of lot, otherwise 5 feet).
- R-1
- Principal front/rear typically 25 feet.
Codes are amended regularly — verify current requirements with **The Town of Castle Rock Building Division (part of Development Services) issues residential building permits within the town limits.
Energy Code
Castle Rock energy code quick facts
- Code reference
- 2021 International Energy Conservation Code (IECC), with local amendments, as adopted by Ordinance No. 2026-017 (adopted June 2, 2026; effective June 30, 2026), along with the Colorado Model Electric-Ready and Solar-Ready Code.Ordinance No. 2026-017
- Code reference
- This applies to Castle Rock (Douglas County, Climate Zone 5B).
- Code reference
- The adoption aligns with state requirements for jurisdictions updating other building codes by the June 30, 2026 deadline.
- Code reference
- Specific local numeric amendments to prescriptive requirements (e.g., R-values, U-factors, or air-sealing thresholds for remodels/additions) are not detailed in publicly available sources beyond references to the base 2021 IECC tables/sections (such as Table R402.1.2 for insulation/fenestration and
- Code reference
- The adopting ordinance incorporates the 2021 IECC by reference with amendments thereto but does not appear to alter the core prescriptive values in available excerpts.ordinance incorporates
Codes are amended regularly — verify current requirements with **The Town of Castle Rock Building Division (part of Development Services) issues residential building permits within the town limits.
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What garage conversion covers
Garage conversions in the Denver metro turn an attached or detached garage into conditioned living space or, where zoning allows, an accessory dwelling unit. Work typically includes insulation, new openings, electrical, HVAC, and often a bath or kitchen. Parking on the lot still has to satisfy zoning. A municipally licensed Denver general contractor coordinates the project and licensed specialty trades. Cost is project-specific and depends on attached versus detached, ADU versus extra rooms, and how much of the envelope changes.
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Occupancy, energy code, and ADUs
Turning an unconditioned garage into a bedroom is a change of space conditioning. Denver Energy Code Chapter 5 [RE] treats that as a change of occupancy or use and applies addition/new-construction energy rules to the newly conditioned space. Creating a separate ADU is a different zoning path: the district must allow an accessory dwelling unit, and plans must clearly label the ADU and the primary structure. Transportation review is listed for ADUs, garages, and increases in dwelling units.
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Permits and who coordinates the work
City and County of Denver Community Planning and Development requires architectural and structural review for occupancy or use changes, plus zoning, building, and typically SUDP. Exterior changes on landmarks or in historic districts need Landmark review. Cities and counties license general contractors. Colorado has no statewide general contractor license. Autotelic acts as a municipally licensed Denver general contractor and coordinates licensed specialty trades plus the design professionals required for the project.
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What buyers should prepare
Attached versus detached, living space versus ADU, whether a bath or kitchen is included, and how parking will be handled.
FAQ
Common questions
Does converting a garage need a Denver permit?
Yes. It is a change of occupancy or use. CPD requires building and zoning review, and typically SUDP.
Who handles garage conversion permits and licensing?
A municipally licensed Denver general contractor coordinates the project, design professionals, and specialty trades. Colorado has no statewide general contractor license.
Is extra living space the same as an ADU?
No. Extra rooms for the main house stay one dwelling. An ADU is a separate dwelling and is only allowed in districts that permit it.
Does energy code apply to a cold garage?
Yes once it becomes conditioned. Denver Energy Code uses turning an unconditioned garage into a bedroom as an example of a change of space conditioning.
What information helps define scope?
Attached vs detached, ADU vs extra rooms, parking plan, and city or county.
Service Area
Serving Castle Rock and Douglas County
We serve Castle Rock, 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 Castle Rock project.
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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