1920s Basement ADU Transformation

ADURenovation
Written By Phillip Daughton

Project Overview

This project is one of many basement renovations Prenvalley Builders has completed throughout Denver. Due to the home’s age, dating back to the 1920s, the lower level presented several challenges, including aging concrete walls, settled framing, and uneven floors. Through careful construction and problem-solving, the basement was transformed into a fully functional lower-level ADU, and the homeowners were thrilled with the finished result.

Project Details

Location

995 Sq. Ft.

NAGY Design Co.

Stairwell access to a lower-level ADU built during a Denver basement renovation, featuring updated finishes, handrails, and improved circulation by Prenvalley Builders.
Open living space within a lower-level ADU built during a Denver basement renovation, featuring new flooring, recessed lighting, and improved ceiling height by Prenvalley Builders.
Bedroom and bathroom entry within a lower-level ADU built during a Denver basement renovation, featuring new flooring, trim, and lighting by Prenvalley Builders.

Our Approach

Prenvalley Builders carefully evaluated the existing 1920s structure, addressing uneven floors, aging concrete, and low-clearance conditions common in Denver basements. Through coordinated construction and code-compliant execution, the team delivered a durable, fully functional lower-level ADU that integrates seamlessly with the existing home.

Project Highlights

  • Converted a 1920s basement into a functional lower-level ADU

  • Addressed uneven floors, settled framing, and aging concrete

  • Built a complete living space with kitchen, bedroom, and bath

  • Added flexible, long-term living space and property value

Lower-level ADU dining area and hallway built as part of a Denver basement renovation, showcasing new flooring, lighting, and circulation between living spaces by Prenvalley Builders.
Open living area and kitchenette within a lower-level ADU built during a Denver basement renovation, featuring new flooring, lighting, and cabinetry by Prenvalley Builders.
Lower-level ADU living area built as part of a Denver basement renovation, featuring new flooring, recessed lighting, and finished walls by Prenvalley Builders.

Results

The completed basement renovation transformed the lower level into a fully functional, code-compliant ADU with dedicated living, sleeping, kitchen, and bathroom spaces. Despite the challenges of the home’s age and existing conditions, the finished space provides comfortable, long-term living while adding flexibility and value to the property.

Project Goals

  • Convert an underutilized basement into a fully functional ADU

  • Address structural and code challenges common in older Denver homes

  • Create comfortable, long-term living space within the existing footprint

  • Add flexibility and long-term value to the property

Lower-level ADU bathroom built as part of a Denver basement renovation, featuring a custom vanity, modern fixtures, and a full shower by Prenvalley Builders.
Lower-level ADU bedroom built as part of a Denver basement renovation, featuring new flooring, recessed lighting, and integrated storage by Prenvalley Builders.
Lower-level ADU bedroom built as part of a Denver basement renovation, showcasing a finished sleeping area with updated lighting and durable flooring by Prenvalley Builders.
Phillip Daughton
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