Garage Construction & ADUs Cost Guide — Great Falls, MT

Verified 2025 pricing for garage construction & adus services in Great Falls. Updated quarterly from local contractor data.

Service Cost Ranges

Service	Low	Average	High	Unit
Detached Garage Construction	$20,000	$45,000	$100,000	per project
ADU / Garage Apartment	$60,000	$120,000	$250,000	per project
Carport Installation	$4,000	$9,000	$25,000	installed

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Older housing stock (pre-1968) increases complexity and materials cost

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Limited provider competition can increase pricing above regional averages

✓Get at least 3 quotes

✓Ask about seasonal discounts

✓Bundle multiple services

✓Check for manufacturer rebates

✓Verify license before hiring

See who offers the best value for money in Great Falls.