What is the benefit of using a helical pier foundation for an ADU?

Helical piers reduce site disruption, require less excavation, and can be installed quickly, making them ideal for compact backyard ADUs. They also provide strong structural support while helping control overall construction costs.

How long does it take to build a detached ADU in Denver?

Construction timelines vary based on scope and permitting, but a compact detached ADU like this typically takes several months once permits are approved. Efficient construction methods and clear sequencing help keep the build moving smoothly.

Can a small ADU still feel functional and comfortable?

Yes. Thoughtful construction, efficient layouts, and features like lofted sleeping areas allow small ADUs to feel comfortable and highly usable without increasing the building footprint.

Is a backyard ADU a good option for rental or guest use?

A detached ADU offers flexibility for long-term rental income, guest accommodations, or future housing needs. When built efficiently, it provides lasting value without major changes to the primary home.

Compact Loft ADU

ADUNew Construction

Sep 23

Written By Phillip Daughton

Project Overview

The homeowner needed a compact backyard ADU that could be built efficiently while keeping costs and site impact low. Prenvalley Builders constructed this detached ADU using a helical pier foundation and a highly efficient layout, navigating the challenges of a tight urban lot and small footprint. What makes this project special is how much functionality was achieved within a minimal footprint without sacrificing comfort or long-term performance.

Project Details

Size: 280 sq ft

Location: Denver, Colorado

Architectural Design: NAGY Design Co.

Installation of helical piers for a detached accessory dwelling unit in Denver, Colorado, with construction crews setting deep foundation supports as part of an ADU build by Prenvalley Builders.

Floor framing and platform construction for a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, showing dimensional lumber framing prepared for vertical construction.

Exterior wall sheathing and partial siding installation on a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders during the construction phase.

Our Approach

Prenvalley Builders focused on efficient construction methods and careful sequencing to deliver a high-performing ADU within a compact footprint. By utilizing a helical pier foundation and precise framing, the team minimized site disruption while maintaining structural integrity. Close coordination throughout the build ensured a smooth process from foundation to final finishes.

Project Highlights

Constructed a detached ADU with a highly efficient, small-footprint layout
Installed a helical pier foundation to reduce site impact and control costs
Executed precise framing to maximize usable interior space
Built a lofted sleeping area to increase functionality without expanding the footprint
Delivered durable exterior materials suited for Denver’s climate
Completed a full ADU build on a tight urban lot with minimal disruption

Completed studio-style interior of a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, featuring an open living and kitchen area with efficient space planning.

Completed kitchen interior of a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, featuring open shelving, stainless steel appliances, and a farmhouse sink.

Finished living area inside a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, featuring integrated storage, a compact sofa, and an open connection to the kitchen.

Completed exterior of a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, featuring white horizontal siding, a pitched roof, and an elevated entry with wood stairs.

Results

The finished ADU delivers a comfortable, fully functional living space within a compact footprint. Thoughtful construction methods and efficient planning resulted in a durable, low-impact backyard residence well suited for Denver’s urban environment. The homeowner gained a versatile ADU that balances performance, cost efficiency, and long-term usability.

Project Goals

Create a compact, fully functional backyard ADU
Minimize construction costs and site disruption
Maximize usable living space within a small footprint
Deliver a durable, low-maintenance structure
Support long-term flexibility for rental or guest use

Loft interior inside a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, featuring ladder access, open railing, and vaulted ceiling above the main living space.

Completed bathroom inside a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, featuring a walk-in shower, compact vanity, and durable finishes.

Loft sleeping area inside a detached accessory dwelling unit in Denver, Colorado, built by Prenvalley Builders, featuring a vaulted ceiling, guardrails, and space-efficient bedroom layout.

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Phillip Daughton