Garage Conversion vs. Detached ADU: Which Makes Sense?
The short version: a garage conversion is usually the cheaper path into an ADU (local builders publish roughly $80,000 to $150,000, versus $185,000 to $420,000 for detached new construction), because it reuses a foundation, a roof, and often utility runs that already exist. A detached new build costs more and buys you a clean slate: ideal layout, better siting, and no compromise with an existing structure. Both are fully legal under Ordinance #25-45.
Where each one wins
- Budget: conversion, clearly, when the existing structure is sound. If the garage needs a new foundation or major structural work, the gap narrows fast, which is why a structural assessment belongs at the start.
- Height and layout: here is the rule most people miss: a new detached ADU is capped at 16 feet, but a garage converted to a detached ADU may reach 25 feet. If you want a two-story carriage-house configuration, the conversion route may be the only way to get the height.
- Keeping your parking: converting the garage consumes covered parking while the ordinance still requires one off-street space for the ADU on top of the home's parking. Lots with a long driveway absorb that easily; tight lots may not.
- Siting and privacy: detached new construction can sit where the lot works best (corner, side, or rear yard; never the front), with separation between tenant and owner that a converted attached garage cannot offer.
- Utilities: a conversion often sits closer to existing service; a detached unit at the back of a deep lot means longer trenching runs, and in either case Colorado Springs Utilities decides during permit review whether the ADU shares service or needs its own connection.
Same rules, same process
Either way, the size cap, design-compatibility standard, short-term rental prohibition, and permit sequence are identical, and both routes require full habitable-dwelling construction: insulation, egress, kitchen and bath, energy code compliance. A converted garage is a real dwelling build, not a weekend project. The numbers by type are in the cost guide, the standards in the ordinance guide, and the approval sequence in the permit walkthrough.