In Denver’s 80220 area, the best home additions don’t just add square footage—they add ease.
- More breathing room in the morning.
- A bathroom that feels like a retreat.
- Storage that finally makes sense.
And an outdoor spot that’s ready for coffee, friends, or a quiet night under the patio fan.
If you’re exploring a similar build, see our Denver room additions service for timelines, process, and options.
Verified Builders completed a 425 sq ft primary suite addition in Denver, CO 80220 with a 150 sq ft covered patio, closed-cell spray foam insulation, mini-split HVAC, James Hardie siding, and a PVC sewer line replacement to the alley main in 4.5 months.
Quick Project Snapshot (Denver 80220)
Location: Denver, Colorado 80220
Project Type: Home addition (primary suite expansion with dual access)
New Interior Space: 425 sq ft
Covered Patio: 150 sq ft on an 8-inch concrete slab
Timeline: 4.5 months
Exterior: James Hardie siding + trim (Alpine Lumber), shingles + underlayment, integrated flashing
Water Management: 5″ gutters and downspouts throughout the addition
Comfort Systems: Mini-split HVAC
Performance: Closed-cell spray foam in walls + ceiling, radon mitigation, waterproofing
Compliance: Permits, plans, engineering, and inspections completed through the City and County of Denver
Infrastructure: PVC sewer line replacement from backyard to main line in the alley
The Goal: Make the Addition Feel Like It Was Always Here
A good Denver home addition shouldn’t look “tacked on.” It should feel like the home grew naturally—architecturally, structurally, and stylistically.
This build was designed to blend with the existing house while delivering a modern, comfortable primary suite that’s easy to live in every day.
What We Added: Primary Bedroom, Spa Bathroom, Closet + Laundry
This addition was built as a true suite—private, functional, and finished with details that elevate the experience.
Primary Bedroom Details
Inside, the bedroom feels open and bright, with vaulted ceiling lines, recessed lighting, and a ceiling fan for comfortable airflow.
A sleek horizontal window adds personality without sacrificing privacy, and the layout supports both relaxation and real-life routines.
Walk-In Closet Built for Real Storage
The closet isn’t an afterthought—it’s a feature.
The space includes a custom built-in system with drawer stacks, shelving towers, hanging space, and shoe storage—clean lines, efficient layout, and a place for everything.
The laundry area is positioned for convenience, keeping daily flow simple.
Bathroom That Feels Like a Getaway
This bathroom brings the “spa” feel in a way that still works for everyday use:
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Frameless glass shower enclosure
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Rain shower head + handheld sprayer
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Built-in niche for storage
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Eye-catching tile choices that give the room character and contrast
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Freestanding soaking tub with a floor-mounted tub filler
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Stylish vanity lighting and warm mirror accents that brighten the space
Love the shower + freestanding tub look?
Here’s how we approach bathroom remodeling in Denver—from layout to finishes.
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Foundation
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Exterior Structure
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Interior Structure
Built for Denver: Structure, Envelope, and Exterior Finishes
Denver weather demands more than pretty finishes—it demands a tight envelope and smart water management.
Foundation + Concrete
4-foot concrete foundation walls with crawl space
Concrete slab throughout the entire addition
425 sq ft of concrete installed for addition slab work
150 sq ft covered patio slab, poured at 8-inch thickness
Framing
2×12 floor joists
2×6 wall framing
Roof trusses
Roofing + Weatherproofing Integration
Shingle roofing with underlayment
Proper flashing integration at tie-in points to existing roof and walls
Continuous weatherproofing so the addition performs like a single, unified structure
Siding, Trim, Gutters
James Hardie siding and trim (sourced through Alpine Lumber)
5-inch gutters and downspouts installed across the addition for clean drainage control
Comfort + Performance: Quiet, Efficient, and Built to Last
This addition isn’t just larger—it’s smarter.
Here’s what we did:
Insulation
Closed-cell spray foam insulation in walls for high-performance air sealing and comfort
Ceiling spray foam installed, with ventilation baffles included as required
Drywall Finish
Level 5 drywall finish with texture matching to blend with the existing home
Moisture-resistant board installed in bathroom areas where required
HVAC
For heating and cooling, we went with a mini-split system.
A great fit for additions when you want efficient comfort without overcomplicating ductwork.
Electrical & Lighting (Safety + Modern Function)
This project included full electrical work to support the new space, including:
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New circuits for the addition
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Panel capacity check to confirm safe service and integration
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Required GFCI/AFCI protection per code
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Smoke and CO detectors installed
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New lighting: recessed lighting, fan lighting, and supplementary fixtures to complete the design
Infrastructure Upgrade: Sewer Line Replacement to the Alley Main
Not glamorous—but absolutely valuable.
This project included a PVC sewer line replacement running from the backyard to the main line in the alley, improving reliability and reducing the risk of future backups or failures.
Covered Patio: Outdoor Space That Gets Used
A covered patio should feel like another room—especially in Denver.
This one was built for comfort and usability, featuring a clean exterior look, solid concrete work, and a layout ready for real life (morning coffee, summer dinners, and shaded afternoons).
Project Timeline
From start to finish, this Denver 80220 addition was completed in 4.5 months, with all required approvals completed through the City and County of Denver.
FAQs: Denver Primary Suite Additions
Can you build an addition with both interior and exterior access?
Yes. This suite includes access from the existing home and a separate exterior entry, offering flexibility for guests, extended family, or future use.
Why choose a mini-split for a new addition in Denver?
Mini-splits provide efficient heating and cooling with zoned comfort—ideal for additions where you want predictable temperature control without overextending the existing system.
Is James Hardie siding the correct choice for Denver?
It’s a popular choice for durability and clean aesthetics, especially when paired with proper flashing, underlayment, and smart drainage planning.
Do you handle permits and inspections in Denver?
This project’s permits, plans, engineering, and inspections were completed through the City and County of Denver, ensuring full compliance.
Thinking About a Home Addition in the Denver Metro?
Not sure where to start?
Our remodeling planning & design process helps you map scope, budget, and build details before construction.
