| Cover | Nov. 15, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 15, 2021 |
| Entity Registrant Name | Sunlight Financial Holdings Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39739 |
| Entity Tax Identification Number | 85-2599566 |
| Entity Address, Address Line One | 101 North Tryon Street |
| Entity Address, Address Line Two | Suite 1000 |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28246 |
| City Area Code | 888 |
| Local Phone Number | 315-0822 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001821850 |
| Amendment Flag | false |
| Class A Common Stock, par value $0.0001 per share | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | SUNL |
| Security Exchange Name | NYSE |
| Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 per share | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 per share |
| Trading Symbol | SUNL.WS |
| Security Exchange Name | NYSE |
