Garage Construction & ADUs Cost Guide — Charleston, SC

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

Service Cost Ranges

Service	Low	Average	High	Unit
Detached Garage Construction	$23,000	$51,750	$115,000	per project
ADU / Garage Apartment	$69,000	$138,000	$287,500	per project
Carport Installation	$4,600	$10,350	$28,750	installed

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Older housing stock (pre-1978) increases complexity and materials cost

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High humidity increases wear on systems; maintenance needs are higher

✓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 Charleston.