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Stockholders'/ members' equity (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Jan. 16, 2024
USD ($)
May 15, 2024
USD ($)
Mar. 31, 2024
USD ($)
Vote
shares
Mar. 31, 2023
USD ($)
Summary of Capitalization and Voting Rights [Abstract]        
Preferred stock, authorized (in shares)     10,000,000  
Preferred stock, issued (in shares)     0  
Preferred stock, outstanding (in shares)     0  
Smith Douglas Holdings LLC [Member]        
Summary of Capitalization and Voting Rights [Abstract]        
Percentage of economic interest     17.30%  
Percentage of non-controlling interest     82.70%  
Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member]        
Distributions to Members Related to Their Income Tax Liabilities [Abstract]        
Tax distributions | $     $ 14.5 $ 19.5
Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member] | Subsequent Event [Member]        
Distributions to Members Related to Their Income Tax Liabilities [Abstract]        
Tax distributions | $   $ 6.4    
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  
Common stock, issued (in shares)     8,846,154  
Common stock, outstanding (in shares)     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  
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  
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  
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  
Class B Common Stock [Member]        
Summary of Capitalization and Voting Rights [Abstract]        
Common stock, authorized (in shares)     100,000,000  
Common stock, issued (in shares)     42,435,897  
Common stock, outstanding (in shares)     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  
[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.