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GOLDEN SERVICES
Second-Story Addition in Golden
Licensed second-story addition services for Golden and Jefferson County. Double your living space without moving.
What Golden requires
ADUs are permitted in the following residential zone districts in conjunction wi: R-E, R-1, R-1A, R-2, and R-3 (Municipal Code § 18.28.240; city ADU page). § 18.28.240
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Local Service
Second-Story Addition Services in Golden, Colorado
Autotelic provides professional second-story addition services throughout Golden and the surrounding Jefferson 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 Golden (gateway to the mountains) or nearby communities, our team delivers quality workmanship backed by Colorado licensing and full insurance coverage.
Permit Thresholds
Golden permit thresholds
- Code reference
- Building Permit Fees table (effective 05/01/11, as modified by resolutions).
- Exterior
- One-story detached accessory structures ≤200 sq ft (residential only); fences ≤7 ft tall (unless front yard, corner lot, or historic district); landscaping; minor roof or siding repairs/replacement (10% or less of total area); minor maintenance/repairs; painting; retaining/landscape walls ≤4 ft tall
- Code reference
- Retaining/landscape walls over 4 ft (or supporting surcharge) also trigger requirements, often needing engineering.
- For homeowners doing their own work
- materials cost × 2.
- Building permit fees are calculated from a tiered table based on total valuation
- $1–$500 = $25.85; higher tiers add per-$100 or per-$1,000 increments up to $1M+).
- Additional plan review fee (when applicable)
- 65% of the permit fee.
- Building use tax
- 3% use tax on building materials, stated as 1.5% of total valuation.
Codes are amended regularly — verify current requirements with **The City of Golden (specifically its Building Division/Building Department) issues residential building permits for properties within Golden city limits.
Zoning & ADU
Golden zoning & ADU quick facts
- ADUs are permitted in the following residential zone districts in conjunction wi
- R-E, R-1, R-1A, R-2, and R-3 (Municipal Code § 18.28.240; city ADU page).§ 18.28.240
- Code reference
- Lot coverage of all accessory structures must not exceed 10% of the lot area (§ 18.28.240).§ 18.28.240
- Code reference
- Specific numeric standards for max lot coverage %, max building height, ADU max size, and setbacks for the listed districts (or any form types within them) are not detailed in publicly available summaries of the code or related documents without direct access to the full current Municipal Code Title
- Code reference
- One reference notes aggregate total lot coverage limits applying to structures in RE, R-1, and R-1A districts, but the exact percentage is not specified in available sources.
- Code reference
- For precise, current standards, consult the full Golden Municipal Code (library.municode.com/co/golden/codes/municipal_code, Title 18) or contact the city, as the zoning code has undergone form-based updates.
Codes are amended regularly — verify current requirements with **The City of Golden (specifically its Building Division/Building Department) issues residential building permits for properties within Golden city limits.
The build sequence for a Second-Story Addition project
This service is a component of How a Home remodel project works in Golden.
Energy Code
Golden energy code quick facts
- Code reference
- 2024 International Energy Conservation Code (IECC), adopted by the City of Golden with no energy-specific local amendments noted beyond the base code (and state electric-ready/solar-ready provisions where applicable).
- Code reference
- Golden (Jefferson County, climate zone 5B) lists the 2024 IECC among its adopted codes on the official Building Permit Process page.
- Code reference
- Adoption aligns with the city’s update to the 2024 I-Codes suite (effective after the July 22, 2025 council action referenced in related materials).
- Code reference
- The code applies to new construction, additions, and remodels/alterations as scoped in the IECC/IRC.
- Code reference
- Key prescriptive requirements (2024 IECC residential provisions, Table R402.1.2 / R402.1.3 and related sections, climate zone 5 / 5B; relevant to additions and remodels where the thermal envelope or systems are altered):
- Ceiling/attic insulation
- Minimum R-49 (or equivalent U-factor).
- Code reference
- (2024 IECC Table R402.1.3 / IRC N1102.1.3; note reduction from prior editions.)
- Wood-frame wall insulation
- R-20 + R-5 ci, or R-13 + R-10 ci, or R-0 + R-20 ci (or equivalent U-factor options).
Codes are amended regularly — verify current requirements with **The City of Golden (specifically its Building Division/Building Department) issues residential building permits for properties within Golden city limits.
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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 Golden and Jefferson County
We serve Golden, 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 Golden 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 →Let's design your perfect Second-Story Addition together
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