Building a detached garage in Denver is one of the smartest investments a homeowner can make. Whether you need covered parking, a workshop, extra storage, or a foundation for a future accessory dwelling unit (ADU), a well-built detached garage adds function and value to your property. But before you break ground, you need to understand what it costs, what permits Denver requires, and how local zoning rules affect your plans.
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This guide walks you through everything you need to know about detached garage construction in the Denver metro area, from cost breakdowns and permit steps to design options and the ADU angle that many homeowners overlook.
What Does a Detached Garage Cost in Denver?
Detached garage costs in Denver vary based on size, materials, foundation type, and whether you add plumbing or electrical. According to Angi’s 2026 data, the average cost to build a garage in Denver is around $28,900, with most projects falling between $19,100 and $38,700. Per-square-foot costs range from $29 to $118, with $49 per square foot as the metro average. Simple builds sit at the low end, while high-end detached garages with full utilities and finished interiors push toward the top.
Here is how costs break down by garage size in the Denver area:
| Garage Size | Approximate Sq Ft | Estimated Cost Range | Best For |
|---|---|---|---|
| 1-Car Garage | 200 – 300 sq ft | $15,000 – $28,000 | Single vehicle, basic storage |
| 2-Car Garage | 400 – 576 sq ft | $28,000 – $55,000 | Two vehicles, workshop space |
| 3-Car Garage | 600 – 900 sq ft | $50,000 – $90,000 | Multiple vehicles, large workshop, storage |
These ranges assume a concrete slab foundation, wood or steel framing, standard roofing, and a garage door. Several factors push costs higher in Denver specifically:
- Foundation work: Colorado’s expansive clay soils often require engineered foundations, adding $4 to $8 per square foot depending on soil conditions. A Denver concrete foundation contractor can assess your site and recommend the right approach. For a deeper look at foundation pricing, read our guide on the cost to build a foundation in Colorado.
- Insulation for altitude climate: Denver sits at 5,280 feet with temperature swings from below zero in winter to 95+ degrees in summer. Proper insulation (R-19 walls, R-38 ceiling) adds $2,000 to $5,000 but pays for itself if you plan to use the space year-round.
- Electrical and plumbing: Adding a subpanel, lighting, outlets, and a utility sink typically costs $3,000 to $8,000. If you want to heat the space or run power tools, plan for this upfront.
- Permits and engineering: Denver building permits for a detached garage start at $220 (base fee) plus $8 per $1,000 of project value above $25,000, plus a 50% plan review fee on top. A 2-car garage valued around $40,000 typically runs $800 to $1,500 in total permit costs.
A detached garage also adds resale value. Industry data shows garages can add $12,000 to $36,000 to a home’s sale price depending on size and condition, making it one of the highest-ROI home construction projects you can take on.
How Do You Get a Garage Building Permit in Denver?
Denver requires a building permit for any new detached garage. The City and County of Denver’s Community Planning and Development (CPD) department handles all residential permits. You will also need a Sewer Use and Drainage Permit (SUDP) since detached garages have specific stormwater drainage requirements. Here is the typical process:
- Site survey and plans: You need a site plan showing the garage location relative to property lines, the main house, and any other structures. Most projects also need construction drawings showing the foundation, framing, electrical, and roofing details.
- Zoning review: CPD reviews your plans to confirm the garage meets setback requirements, height limits, and lot coverage maximums for your zone district.
- SUDP application: Denver requires a separate drainage permit for detached garages to manage stormwater runoff. Downspouts must be at least 3 feet from adjacent properties, and drainage conveyance must sit at least 1 foot from property lines.
- Permit application: Submit your plans through Denver’s online permitting portal (Denver ePlan) or in person. Residential garage permits typically take 2 to 6 weeks for review, though backlogs can push this longer during busy building seasons.
- Trade permits: If you are adding electrical, plumbing, or mechanical systems to the garage, you need separate trade permits for each. These run concurrently with the building permit review.
- Inspections during construction: Expect at least four inspections: foundation/footing, framing, electrical rough-in, and final inspection.
- Certificate of occupancy: After passing final inspection, you receive a certificate confirming the garage meets all code requirements.
The process is similar to the requirements for building a home addition in Denver. Your general contractor should handle the entire permit process as part of the project. At Faros Construction, we manage all permitting and planning so you can focus on design decisions instead of paperwork.
One important note: building without a permit is illegal in Denver and can result in fines, mandatory demolition, and problems when selling your home. Always pull permits, even for a simple garage.
Denver Zoning Rules: Setbacks, Lot Coverage, and Height Limits
Before designing your detached garage, you need to know what Denver’s zoning code allows on your specific lot. Denver’s zoning rules for detached accessory structures are governed by Section 5.3.4 of the Denver Zoning Code. The rules vary by zone district, but here are the general guidelines for most residential properties:
- Rear setback: In most Denver single-unit (SU) residential zones, detached garages must sit at least 12 feet from the rear property line if your lot has alley access, or 20 feet if there is no alley. This is larger than many homeowners expect.
- Side setback: A minimum of 5 feet from any side property line, with a combined total of at least 10 feet for both sides.
- Separation from the main house: Denver code requires at least 6 feet of separation between a detached garage and the primary dwelling, though this varies by zone.
- Maximum height: Detached garages located in the rear 35% of the lot are limited to 17 feet. You can gain anZYÚÜ]\HÈY]ÙY][Û[ÚYHÙ]XÚÈ^[ÛHZ[[][K\ÈHX^[][HÙNHY]ÛOOÝÛÏÝÛÝ\YÙNÜÝÛÏ[ÜÝ[\\ÚY[X[Û\ÈØ\Ý[Z[[ÈÛÝ\YÙH
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