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HIGHLANDS RANCH SERVICES
Second-Story Addition in Highlands Ranch
Licensed second-story addition services for Highlands Ranch and Douglas County. Double your living space without moving.
What Highlands Ranch requires
Permit Required Generally: Douglas County Code Chapter 15.12, Section 15.12.010, addresses when a permit is generally required. §15.12.010
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Local Service
Second-Story Addition Services in Highlands Ranch, Colorado
Autotelic provides professional second-story addition services throughout Highlands Ranch and the surrounding Douglas County area. Full second-story additions across the Denver metro with structural engineering, framing, roofing, and complete interior build-out. Commercially licensed and insured. Whether you're in Highlands Ranch (large master-planned community) or nearby communities, our team delivers quality workmanship backed by Colorado licensing and full insurance coverage.
Permits & Licensing
Permits in Highlands Ranch
Highlands Ranch is unincorporated, so building permits there are issued by Douglas County's Building Division rather than a city government. The county's Contractor Registration Program requires contractors applying for permits to be registered with the county first. Authority: Douglas County — Building Division.
Permit Thresholds
Highlands Ranch permit thresholds
- Code reference
- Douglas County has adopted the 2024 International Residential Code (IRC) with local amendments, effective July 1, 2026.
- Code reference
- Douglas County adopted the 2024 International Residential Code (IRC) with amendments, effective July 1, 2026.
- Permit Required Generally
- Douglas County Code Chapter 15.12, Section 15.12.010, addresses when a permit is generally required.§15.12.010
- Work Exempt From Permit
- Douglas County, Colorado, details exemptions under Chapter 13.
- Code reference
- CONSTRUCTION CODES, Section 13-107.4.1.§13-107.4.1.
- Code reference
- Work Exempt From Permit (Douglas County, Colorado - Chapter 13.
- Code reference
- One-story detached accessory structures (such as tool and storage sheds, playhouses, and similar buildings) provided the floor area does not exceed 200 square feet.
- Code reference
- Fences not over 7 feet high.
Codes are amended regularly — verify current requirements with Douglas County — Building Division.
Zoning & ADU
Highlands Ranch zoning & ADU quick facts
- Douglas County Residential Districts (General)
- 40% (for single-family detached, duplex, and triplex dwellings).
- Code reference
- This applies to the R-L (Residential Low Density) District and other general residential districts in Douglas County, and is generally applicable in the absence of more specific PD standards.
- Douglas County Residential Districts (Principal Structures)
- 35 feet.
- Code reference
- (Article 4, Division I, Douglas County Zoning Resolution).
- Douglas County Residential Districts (Accessory Structures)
- Two stories or 26 feet, whichever is less.
- Code reference
- (Article 4, Division I, Douglas County Zoning Resolution).
- Code reference
- Detached ADUs are typically restricted to one story or 20 feet.
- Code reference
- ADUs are permitted within rural or agricultural districts in Douglas County (DCC 18.16.170).
Codes are amended regularly — verify current requirements with Douglas County — Building Division.
The build sequence for a Second-Story Addition project
This service is a component of How a Home remodel project works in Highlands Ranch.
Energy Code
Highlands Ranch energy code quick facts
- Code reference
- Douglas County, which includes Highlands Ranch, Colorado, has adopted the 2024 International Energy Conservation Code (IECC) with local amendments, effective July 1, 2026.
- Code reference
- This adoption aligns with Colorado state law, which mandates that jurisdictions updating other building codes between July 1, 2023, and June 30, 2026, must adopt at least the 2021 or 2024 IECC and the Colorado Model Electric Ready and Solar Ready Code.
- Code reference
- Starting July 1, 2026, jurisdictions are required to adopt the Colorado Model Low Energy and Carbon Code (MLECC), which is based on the 2024 IECC and replaces the IECC and the Model Electric Ready and Solar Ready Code.
- Code reference
- The climate zone for unincorporated Douglas County is established as Zone 5B.
- Code reference
- Detailed local amendments to the 2024 IECC from Douglas County were not immediately available in the search results.
- Code reference
- Therefore, the following prescriptive requirements are based on the general principles of the 2024 IECC for Climate Zone 5B, with a specific amendment identified from previous Douglas County adoptions (2018 IECC amendments) that is likely to carry forward in some form, as local amendments generally
- Code reference
- For precise requirements, it is essential to consult the full Douglas County 2024 IECC Amendments document.
- Code reference
- ### Key Prescriptive Requirements for Remodels/Additions (Climate Zone 5B)
Codes are amended regularly — verify current requirements with Douglas County — Building Division.
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What a second-story addition covers
A second-story addition in the Denver metro adds habitable floor over an existing house: new floor structure, stairs, roof, windows, and usually electrical, mechanical, and plumbing. The existing foundation and walls have to carry the extra load. A municipally licensed Denver general contractor coordinates the project, design professionals, and licensed specialty trades. Cost is project-specific and depends on structure, roof, and how much of the first floor is opened.
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Structure and zoning height
City and County of Denver Community Planning and Development treats second-story additions as structural review items that exceed IRC prescriptive limits. The residential permitting guide asks for a letter of structural integrity sealed by a design professional who personally inspected the existing foundation and building (DBCA 133.3). Zoning height is measured in feet and stories from the front and rear base planes (Denver Zoning Code Sec. 13.1.2). Plans should show allowed versus proposed height.
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Permits and who coordinates the work
Additions typically need zoning, building, and Sewer Use and Drainage (SUDP) reviews, plus electrical, mechanical, and plumbing when those systems change. Denver Energy Code Chapter 5 [RE] applies to additions. 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
Target rooms, existing drawings if any, roof and attic photos, and known foundation concerns.
FAQ
Common questions
Do second-story additions need a Denver permit?
Yes. CPD requires building, zoning, and typically SUDP, with structural review because the work exceeds IRC prescriptive limits.
Who handles second-story permits and licensing?
A municipally licensed Denver general contractor coordinates the project, design professionals, and specialty trades. Colorado has no statewide general contractor license.
Can the existing foundation take a second story?
Only after a design professional inspects it. CPD asks for a sealed structural-integrity letter for second-story additions.
How is height measured?
In feet and stories from the zoning front and rear base planes, not just from the sidewalk.
What information helps define scope?
Desired rooms, existing drawings, foundation notes, landmark status, and city or county.
Service Area
Serving Highlands Ranch and Douglas County
We serve Highlands Ranch, 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 Highlands Ranch project.
How It Runs
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Survey
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Design
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Build
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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 →Let's design your perfect Second-Story Addition together
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