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LAFAYETTE SERVICES
Second-Story Addition in Lafayette
Licensed second-story addition services for Lafayette and Boulder County. Double your living space without moving.
What Lafayette requires
Code reference: Exempt work (from building permit requirements, per the City’s website and 2023 Lafayette Colorado Building Code amendments to IRC Section R105.2 / equivalent) includes (non-exhaustive list relevant to remodels): §R105.2
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Local Service
Second-Story Addition Services in Lafayette, Colorado
Autotelic provides professional second-story addition services throughout Lafayette and the surrounding Boulder 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 Lafayette (east Boulder County) or nearby communities, our team delivers quality workmanship backed by Colorado licensing and full insurance coverage.
Permit Thresholds
Lafayette permit thresholds
- Code reference
- This follows the City’s adopted codes (primarily the 2021 International Residential Code with local amendments in the 2023 Lafayette Colorado Building Code, effective August 1, 2023).
- Code reference
- Exempt work (from building permit requirements, per the City’s website and 2023 Lafayette Colorado Building Code amendments to IRC Section R105.2 / equivalent) includes (non-exhaustive list relevant to remodels):§R105.2
- Code reference
- One-story detached accessory storage sheds under 120 sq ft.
- Code reference
- Retaining walls under 3 ft high (measured from bottom of footing to top of wall, unless supporting a surcharge).
- Code reference
- Sidewalks, driveways, and patios less than 30 inches above adjacent grade and not part of an accessible route.
- Code reference
- Window awnings projecting no more than 54 inches from a residence (no additional support required).
- Construction use tax
- Any person obtaining a building permit must pay a use tax deposit of 3.87% on 60% of the value of the permit (per Sec. 110-37 of the Municipal Code).§110-37
Codes are amended regularly — verify current requirements with **City of Lafayette, Colorado Building Division (part of the Planning & Building Department) issues residential building permits within city limits.
Zoning & ADU
Lafayette zoning & ADU quick facts
- Code reference
- Most common single-family residential districts in Lafayette, CO (current Chapter 26 zoning, post-Ordinance No. 10, Series 2025 amendments) include RE1, RE2, R0, R1, R2, R3, R4, and OTR (Old Town Residential). ADUs are also permitted in AG, T1, DR, and P (plus limited cases in B1/C1 on lots withOrd. No. 10
- Code reference
- Key numeric standards from Table 26-B (SPATIAL REQUIREMENTS) and related sections (primarily §26-14-19 for ADUs/accessory structures; also Table 26-A for permitted uses):§26-14-19
- Max lot coverage (applies to all structures combined, relevant to additions/ADUs
- RE1: 15%; RE2: 25%; R0: 30%; R1: 30%; R2: 30%; R3: 30%; R4: 30%; OTR: 30%; AG: 20%.
- Code reference
- (Table 26-B).
- Max building height (principal structure)
- RE1: 27'; RE2: 27'; R0: 27'; R1: 27'; R2: 27'; R3: 35'; R4: 35'; OTR: 27'; AG: 27'.
- (Table 26-B; note
- heights to 35' possible in some districts with special review).
- ADU permitted
- Yes in RE1, RE2, R0, R1, R2, OTR, R3, R4, AG, T1, DR, P (and limited B1/C1 on qualifying single-family lots).
- Code reference
- Not in RSR or M1.
Codes are amended regularly — verify current requirements with **City of Lafayette, Colorado Building Division (part of the Planning & Building Department) issues residential building permits within city limits.
The build sequence for a Second-Story Addition project
This service is a component of How a Home remodel project works in Lafayette.
Energy Code
Lafayette energy code quick facts
- Code reference
- 2021 IECC (residential and commercial provisions) with local amendments, as adopted in the 2023 Lafayette, Colorado Building Code (effective August 1, 2023).
- Code reference
- This is confirmed on the City’s official Building Code & Design Information page and in the adopted code document (which includes Article 9 amendments to the 2021 IECC).
- Code reference
- The base prescriptive requirements follow the 2021 IECC (Climate Zone 5B for the Lafayette area).
- Code reference
- The City is in the process of considering 2024 I-Codes (including a Metro Cohort Model Code based on the 2024 IECC) but has not yet adopted them.
- Code reference
- Key prescriptive requirements relevant to remodels/additions (drawn from the 2021 IECC as adopted/amended locally; specific numeric values and sections are from the base 2021 IECC unless locally modified in Article 9 of the 2023 Lafayette code—local amendments focus more on electrification/solar
- Wall insulation (wood-frame above-grade)
- R-20 + R-5 ci or R-13 + R-10 ci (2021 IECC Table R402.1.2 / prescriptive path; applies to additions and alterations per R503).
- Ceiling/attic insulation
- R-49 (or higher per table footnotes; 2021 IECC Table R402.1.2; relevant for additions and certain alterations).
- Fenestration (windows/doors)
- Maximum U-factor typically 0.30 (or as specified in Table R402.1.2 for CZ 5; SHGC requirements also apply; relevant for replacement windows in remodels).
Codes are amended regularly — verify current requirements with **City of Lafayette, Colorado Building Division (part of the Planning & Building Department) issues residential building permits within 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 Lafayette and Boulder County
We serve Lafayette, 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 Lafayette 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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