Sunnyside ADU + Garage Addition

ADU

Feb 18

Custom garage ADU in Denver’s Sunnyside neighborhood featuring a two-car garage, vertical siding, cedar shingle accents, and dormer windows, designed and built by Prenvalley Builders.

Project Overview

This beautiful Sunnyside ADU was completed in the summer of 2024. It features a 2.5 car garage, 2 bedrooms, 1 bathroom, a kitchen/ living area and vaulted ceilings/ dormers that provide a lot of character in and out of the structure.

Project Details

Denver, Colorado

811 sq. ft. (not including garage)

Radix Design

Upper-level floor plan of a custom ADU in Denver’s Sunnyside neighborhood showing two bedrooms, a full bathroom, open living and kitchen layout, stacked laundry, and efficient circulation designed by Prenvalley Builders.

Ground-level floor plan of a custom garage ADU in Denver’s Sunnyside neighborhood showing a two-car garage, dedicated ADU entry, stair access, storage, and EV-ready infrastructure designed by Prenvalley Builders.

Our Approach

We approached this project with a focus on efficiency, thoughtful design, and responsible material use. Our design–build process allowed us to refine every detail—from structural framing to material selections—ensuring the ADU performed well in Colorado’s climate while maintaining long-term durability.

Project Highlights

Detached ADU with efficient layout
High-performance insulation & windows
Durable exterior materials for Colorado climate
Energy-efficient HVAC system
Low-waste construction practices
Thoughtful interior finishes
Seamless connection between garage + living space
Designed for both family use & rental income

Framing in progress on a custom garage ADU in Denver’s Sunnyside neighborhood, showing structural walls, second-story layout, and design-build coordination by Prenvalley Builders.

Sheathing and roof assembly in progress on a custom garage ADU in Denver’s Sunnyside neighborhood, showing dormer construction, structural detailing, and envelope preparation by Prenvalley Builders.

Exterior siding installation on a custom garage ADU in Denver’s Sunnyside neighborhood, showing vertical siding, dormer windows, and architectural detailing built by Prenvalley Builders.

Finished exterior of a custom garage ADU in Denver’s Sunnyside neighborhood featuring vertical siding, cedar shingle accents, dormer windows, and a two-car garage built by Prenvalley Builders.

Results

This ADU added significant long-term value to the property while providing flexible living options for the homeowners. The high-performance envelope, durable materials, and thoughtful design ensure comfort, efficient energy use, and lasting durability.

Project Goals

Increase usable square footage
Add long-term rental income potential
Improve energy performance
Blend seamlessly with existing architecture
Support multi-generational living
Modernize functionality

Finished bathroom interior in a custom Denver ADU featuring a skylight, sloped ceiling, modern vanity, brass fixtures, and integrated storage designed and built by Prenvalley Builders.

Open-concept living and kitchen area inside a custom Denver ADU featuring vaulted ceilings, dormer windows, modern cabinetry, and a flexible workspace designed by Prenvalley Builders.

Kitchen interior of a custom Denver ADU featuring vaulted ceilings, a skylight, modern wood cabinetry, island seating, and energy-efficient appliances designed by Prenvalley Builders.

Phillip Daughton