Cost to Detached Garage Construction in St. Louis, MO

$17,600–$52,800 in St. Louis

12% below the national average · 0.88x cost multiplier

In St. Louis, a detached garage construction runs $17,600 to $52,800 on average — about 12% below what homeowners pay nationwide. The Midwest market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.

Cost Breakdown in St. Louis

Line Item	Low	Mid	High
Cost per sq ft	$31	$53	$106
Materials	$8,800	$15,840	$30,800
Labor	$8,800	$14,080	$24,640
Permits	$1,056	$1,584	$2,200
Design	$440	$1,056	$3,080
Total	$19,096-12% vs. national avg	$32,560-12% vs. national avg	$60,720-12% vs. national avg

Budget

Basic 20x20 (400 sq ft) single-car detached garage - wood frame, T1-11 siding, asphalt shingles, concrete slab, one standard garage door, minimal electrical

Mid-Range

24x24 (576 sq ft) two-car detached garage - wood frame, LP SmartSide siding, architectural shingles, concrete slab, two garage doors, full electrical with subpanel, windows

Premium

24x36 (864 sq ft) carriage-style two-car garage with bonus room above - engineered lumber, shingle siding, metal roof, concrete slab with radiant heat, custom carriage doors, full electrical, plumbing rough-in

Material Options

Material prices below are national averages; availability in St. Louis may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
Wood Frame with T1-11 Siding	$35 - $55 per sq ft	Lowest cost, widely available, easy to modify or repair	T1-11 requires regular painting, not as durable as engineered wood products	Budget builds where cost is the primary concern and the garage is utilitarianLowest cost, widely available, easy to modify or repair
Wood Frame with LP SmartSide	$45 - $70 per sq ft	More durable than T1-11, pre-primed, lower maintenance, better curb appeal	Higher cost than T1-11 but worth it for most applications	Mid-range builds that need to look good and last - the most popular choiceMore durable than T1-11, pre-primed, lower maintenance, better curb appeal
Concrete Block (CMU) or ICF	$55 - $90 per sq ft	Extremely durable, fire-resistant, pest-resistant, great sound deadening, higher perceived value	More expensive, heavier foundation required, less common in residential applications	Tropical climates (hurricane resistance), homes where fire separation is a concern, or workshop spacesExtremely durable, fire-resistant, pest-resistant, great sound deadening, higher perceived value
Steel Building Kit (Pre-Engineered Metal)	$25 - $50 per sq ft for shell	Lower cost for large structures, fast construction, very durable, low maintenance, clear-span interior	Industrial look, difficult to match home aesthetics, condensation issues without proper insulation	Rural properties, farms, or large workshop spaces where looks are secondary to functionLower cost for large structures, fast construction, very durable, low maintenance, clear-span interior
Carriage House / Custom Wood Siding	$70 - $120 per sq ft	High-end aesthetic, adds significant property value, highly customizable, can match any architectural style	Highest cost, requires experienced builder, more complex permitting	Premium properties where the garage is a visible architectural feature of the homeHigh-end aesthetic, adds significant property value, highly customizable, can match any architectural style

Other Projects in St. Louis

Full Kitchen Remodel

Basement Finishing

Roof Replacement (Asphalt Shingles)

Back to national average for Detached Garage Construction

St. Louis Estimate

Typical Range

$17,600–$52,800

vs. National Average

12% below national

Cost Multiplier

0.88x

Cost Per sq ft

$31–$106

Estimates apply St. Louis's 0.88x regional cost multiplier to national averages. Actual bids vary by contractor, project scope, and timing.

See national average costs →