Stockholders'/ Members' equity (Details) $ in Millions			3 Months Ended	6 Months Ended
		Jan. 16, 2024 USD ($)	Jun. 30, 2024 USD ($) shares	Jun. 30, 2024 USD ($) Vote shares
Summary of Capitalization and Voting Rights [Abstract]
Preferred stock, authorized (in shares)			10,000,000	10,000,000
Preferred stock, issued (in shares)			0	0
Preferred stock, outstanding (in shares)			0	0
Smith Douglas Holdings LLC [Member]
Summary of Capitalization and Voting Rights [Abstract]
Percentage of economic interest			17.30%	17.30%
Percentage of non-controlling interest			82.70%	82.70%
Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member]
Distributions to Members Related to Their Income Tax Liabilities [Abstract]
Tax distributions | $			$ 11.8	$ 26.3
Capital Unit Class C and D [Member]
Redemption of Class C & Class D Units [Abstract]
Aggregate redemption price | $		$ 2.6
Class A Common Stock [Member]
Summary of Capitalization and Voting Rights [Abstract]
Common stock, authorized (in shares)			250,000,000	250,000,000
Common stock, issued (in shares)			8,846,154	8,846,154
Common stock, outstanding (in shares)			8,846,154	8,846,154
Votes per share | Vote				1
Economic rights				Yes
Common Stock Reserved for Future Issuances [Abstract]
Common stock shares reserved for issuance (in shares)			44,487,179	44,487,179
Stock exchange ratio			1
Class A Common Stock [Member] | RSUs [Member]
Common Stock Reserved for Future Issuances [Abstract]
Common stock shares reserved for issuance (in shares)			2,051,282	2,051,282
Class A Common Stock [Member] | Continuing Equity Owners [Member]
Common Stock Reserved for Future Issuances [Abstract]
Common stock shares reserved for issuance (in shares)			42,435,897	42,435,897
Class A Common Stock [Member] | Smith Douglas Holdings LLC [Member] | Smith Douglas Homes Corp. [Member]
Summary of Capitalization and Voting Rights [Abstract]
Common stock, outstanding (in shares)			8,846,154	8,846,154
Class B Common Stock [Member]
Summary of Capitalization and Voting Rights [Abstract]
Common stock, authorized (in shares)			100,000,000	100,000,000
Common stock, issued (in shares)			42,435,897	42,435,897
Common stock, outstanding (in shares)			42,435,897	42,435,897
Votes per share | Vote	[1]			10
Economic rights				No
Votes per share upon Sunset date | Vote				1
Common Stock Reserved for Future Issuances [Abstract]
Stock exchange ratio			1
Class B Common Stock [Member] | Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member]
Summary of Capitalization and Voting Rights [Abstract]
Common stock, outstanding (in shares)			42,435,897	42,435,897

[1] Each share of Class B common stock entitles its holders to ten votes per share on all matters presented to the stockholders and on which the holders of the Class B common stock are entitled to vote; provided, that each share of Class B common stock will only be entitled to one vote per share on all matters presented to the stockholders generally upon the Sunset Date.