v3.26.1
Cover Page - shares
 6 Months Ended
Jun. 30, 2026
Aug. 01, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-40599  
Entity Registrant Name BLEND LABS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 45-5211045  
Entity Address, Address Line One 7250 Redwood Blvd.  
Entity Address, Address Line Two Suite 300  
Entity Address, City or Town Novato  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94945  
City Area Code 650  
Local Phone Number 550-4810  
Title of 12(b) Security Class A common stock, par value $0.00001 per share  
Trading Symbol BLND  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Document Fiscal Year Focus 2026  
Document Period Focus Q2  
Entity Central Index Key 0001855747  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   233,256,934
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,256,385
Class C Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   0