What is a garage ADU and is it allowed in Denver?

A garage ADU is a secondary dwelling built above or in place of an existing garage. Denver allows garage ADUs in many neighborhoods, subject to zoning, size, and setback requirements.

How much does it cost to build a garage ADU in Denver?

Garage ADU costs vary based on size, finishes, and site conditions, but they are often more cost-effective than standalone ADUs due to existing infrastructure and a smaller footprint.

Can a garage ADU be used as a long-term rental?

Yes, many homeowners build garage ADUs specifically for long-term rental income, guest accommodations, or flexible living space for family members.

What are the biggest challenges with garage ADU projects?

Common challenges include tight site constraints, utility connections, zoning compliance, and designing an efficient layout that maximizes livability.

Does building a garage ADU add value to my home?

When thoughtfully designed and built, a garage ADU can significantly increase property value while also providing ongoing rental income or flexible use options.

Compact Garage ADU Addition

ADU

Jul 9

Written By Phillip Daughton

Cost-effective garage ADU exterior in northwest Denver featuring efficient layout, durable siding, and private driveway access, designed and built by Prenvalley Builders.

Project Overview

The homeowner needed a cost-effective way to add rental income and flexible living space without overbuilding the site. Prenvalley Builders designed and built a highly efficient garage ADU, navigating tight space constraints while prioritizing durability, comfort, and long-term performance. What makes this project special is how much functionality and livability was achieved within a streamlined footprint.

Project Details

Size:

Location: Denver, Colorado

Architectural Design: Prenvalley Design

Efficient ADU kitchenette interior in Denver featuring white shaker cabinets, durable countertops, and space-saving layout designed and built by Prenvalley Builders.

Modern ADU bathroom interior in Denver featuring a tiled tub shower, compact vanity, and efficient layout designed and built by Prenvalley Builders.

Our Approach

Prenvalley Builders approached this garage ADU with a focus on efficiency, durability, and long-term value. By carefully balancing layout, material selection, and constructability, the team delivered a high-performing space that supports rental use and everyday comfort. The result is a thoughtful design-build solution tailored to the site and the client’s goals.

Project Highlights

Converted an existing garage into a functional ADU
Maximized space with an efficient open layout
Installed a durable, rental-ready kitchenette
Added a private bedroom and full bathroom
Integrated energy-efficient systems
Delivered a cost-effective rental solutio

Open-concept garage ADU interior in Denver featuring kitchenette, wood flooring, and efficient layout designed and built by Prenvalley Builders.

Results

The completed garage ADU provides a comfortable, efficient living space that supports both rental income and flexible use for the homeowner. Thoughtful planning and durable finishes ensure the space performs well over time. The result is a streamlined addition that adds real value without unnecessary complexity.

Project Goals

Create a cost-effective ADU for rental income
Maximize livability within a compact footprint
Improve long-term durability and performance
Support flexible use for guests or family
Add value without overbuilding the site

Light-filled ADU bedroom in Denver featuring wood flooring, ceiling fan, and efficient layout designed and built by Prenvalley Builders.

Compact ADU bathroom vanity in Denver featuring modern fixtures, efficient storage, and durable finishes designed and built by Prenvalley Builders.

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Phillip Daughton