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Pop-Top Addition in Westminster
Licensed pop-top addition services for Westminster and Adams/Jefferson County. Go up, not out — add a full second story.
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- Construction & Tenant Finish
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Go up, not out — add a full second story
EVERY PROJECT STARTS WITH DESIGN
Local Service
Pop-Top Addition Services in Westminster, Colorado
Autotelic provides professional pop-top addition services throughout Westminster and the surrounding Adams/Jefferson County area. Pop-top second-story additions across the Denver metro — add bedrooms, bathrooms, and living space without expanding your footprint. Structural engineering included. Whether you're in Westminster (between Denver and Boulder) or nearby communities, our team delivers quality workmanship backed by Colorado licensing and full insurance coverage.
Permits & Licensing
Permits in Westminster
Westminster building permits are issued by the Building Division within Community Services, and the city requires general contractors and mechanical, plumbing, and electrical subcontractors to be registered with the city before permit release. The permitting process is fully paperless, running through Westminster's eTRAKiT portal. Authority: City of Westminster — Building Division (Community Services Department).
Permit Thresholds
Westminster permit thresholds
- Code reference
- The primary source is the City of Westminster Building Division’s *Residential Building Permit Requirements* document (updated August 22, 2024), available on the official city website.
- Code reference
- Many exterior items common in remodels/additions (decks >30" above grade, room additions, attached/detached garages, retaining walls >3 ft or with surcharge, etc.) also require permits.
- Code reference
- Decks ≤30 inches above ground (with caveats).
- Code reference
- Stand-alone storage sheds ≤120 sq ft with no electrical/plumbing/mechanical.
- Code reference
- Minor roofing repair (≤100 sq ft).
- Code reference
- Minor siding repair (<100 sq ft).
- Code reference
- Retaining walls ≤36 inches in height (no surcharge).
Codes are amended regularly — verify current requirements with City of Westminster — Building Division (Community Services Department).
Zoning & ADU
Westminster zoning & ADU quick facts
- Code reference
- Westminster, CO primarily uses Planned Unit Development (PUD) zoning for residential areas, with development standards (including lot coverage, height, and setbacks for additions/ADUs/garages) established in approved Planned Development Plans (PDP) or Official Development Plans (ODP) rather than f
- Code reference
- 1, 2025) overlay these.
- Max lot coverage % (principal + additions/ADUs/garages)
- In traditional districts (WMC 11-4-5): RE: 30%; R1: 30%; RA: 30%; R2: 30%; R3: 30%; R4: 30%; T1: 30% (principal building; combined total for ADU contexts follows the same or plan limits).
- Max building height
- In traditional districts (WMC 11-4-5): RE: 25′; R1: 25′; RA: 25′; R2: 25′; R3: 35′; R4: 35′; T1: 35′ (principal).
- ADUs (detached)
- must align with principal or plan limits (one secondary source notes 16′ detached in some contexts, but primary rules tie to principal/plan).
- ADU permitted (yes/which districts)
- Yes, in all zones permitting single-family detached dwellings as a permitted use (including RE, R1, RA, R2, R3, R4, T1, O1, and PUD residential areas).
- ADU max size
- 1,200 sq ft or 50% of gross floor area (GFA) of the principal dwelling, whichever is less (GFA excludes attics <7′ headroom, unenclosed areas, mechanical spaces, etc.).
- If principal dwelling <1,500 sq ft
- up to 750 sq ft (but not larger than principal).
Codes are amended regularly — verify current requirements with City of Westminster — Building Division (Community Services Department).
Energy Code
Westminster energy code quick facts
- Code reference
- Westminster, Colorado, has adopted the 2021 International Energy Conservation Code (IECC) together with the Colorado Model Electric Ready and Solar Ready Codes (as required by state law HB22-1362 for jurisdictions updating building codes).
- Code reference
- This applies to new construction, major renovations, remodels, and additions (with the building thermal envelope and other provisions triggered as applicable under the IECC).
- Code reference
- Westminster is in Climate Zone 5B.
- Code reference
- No unique local amendments decreasing stringency or deviating from the 2021 IECC prescriptive tables (plus the state model electric/solar-ready provisions) are indicated in available adoption materials.
- Code reference
- Key prescriptive requirements for remodels/additions (drawn from the adopted 2021 IECC Residential provisions, Table R402.1.2 / R402.1.3 and related sections; these apply where the scope triggers energy code compliance for the affected envelope components):
- Ceiling/attic insulation
- Minimum R-60 (or equivalent U-factor ≤ 0.026).
- Code reference
- (2021 IECC Table R402.1.2 / R402.1.3, Climate Zone 5.)
- Wood-frame wall insulation
- Minimum R-30 (or 20 + 5 ci, 13 + 10 ci, or 0 + 20 ci options) or equivalent U-factor ≤ 0.045.
Codes are amended regularly — verify current requirements with City of Westminster — Building Division (Community Services Department).
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What a pop-top covers
A pop-top in the Denver metro raises or replaces the roof on the existing footprint to add a story or habitable attic. Walls usually stay; massing and bulk plane control the envelope. The existing foundation still has to take the new loads. A municipally licensed Denver general contractor coordinates the project, design professionals, and licensed specialty trades. Cost is project-specific and depends on roof structure, stairs, and how much of the first floor is opened.
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Bulk plane, height, and landmarks
Zoning height is measured in feet and stories from the front and rear base planes (DZC Sec. 13.1.2). Plans must show allowed versus proposed bulk plane, including roof overhangs. If the existing house already breaks height or bulk rules, elevations should distinguish retained structure from new work. Landmark Preservation lists pop-top/rooftop additions as a review type; designated properties need Landmark approval before zoning or building permits.
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Permits and who coordinates the work
City and County of Denver Community Planning and Development treats pop-tops like other second-story or attic work: structural review and a sealed structural-integrity letter from a design professional who inspected the existing foundation (DBCA 133.3), plus zoning, building, and typically SUDP. 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, roof and attic photos, known foundation issues, and landmark or historic-district status.
FAQ
Common questions
Is a pop-top different from a second-story addition?
A pop-top usually stays on the existing footprint and is controlled by bulk plane. A second-story addition may also expand walls. Both need structural review in Denver.
Who handles pop-top permits and licensing?
A municipally licensed Denver general contractor coordinates the project, design professionals, and specialty trades. Colorado has no statewide general contractor license.
Do historic houses need extra review?
Yes. Landmark lists pop-top/rooftop additions. Approval comes before zoning and building permits on designated properties.
Will the existing foundation work?
Only after a design professional inspects it. CPD asks for a sealed structural-integrity letter for second-story and attic work.
What information helps define scope?
Desired rooms, roof photos, landmark status, and city or county.
Service Area
Serving Westminster and Adams/Jefferson County
We serve Westminster, 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 Westminster 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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