Earnings per share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Numerator:
Net income attributable to Smith Douglas Homes Corp., Basic	$ 246	$ 2,365	$ 811	$ 5,048
Add: Dilutive impact of unvested RSUs	0	0	0	6
Net income attributable to Smith Douglas Homes Corp., Diluted	$ 246	$ 2,365	$ 811	$ 5,054
Denominator:
Weighted average shares of common stock outstanding, Basic (in shares)	8,380,647	8,998,470	8,698,043	8,983,328
Dilutive effects of:
Unvested RSUs (in shares)	0	0	0	177,594
Weighted average shares of common stock outstanding, Diluted (in shares)	8,380,647	8,998,470	8,698,043	9,160,922
Basic earnings per share (in dollars per share)	$ 0.03	$ 0.26	$ 0.09	$ 0.56
Diluted earnings per share (in dollars per share)	$ 0.03	$ 0.26	$ 0.09	$ 0.55