| Cover | Mar. 31, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 31, 2021 |
| Entity File Number | 001-37997 |
| Entity Registrant Name | SACHEM CAPITAL CORP. |
| Entity Central Index Key | 0001682220 |
| Entity Tax Identification Number | 81-3467779 |
| Entity Incorporation, State or Country Code | NY |
| Entity Address, Address Line One | 698 Main Street |
| Entity Address, City or Town | Branford |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06405 |
| City Area Code | 203 |
| Local Phone Number | 433-4736 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Shares, par value $.001 per share |
| Trading Symbol | SACH |
| Security Exchange Name | NYSEAMER |
| 7.125% Notes Due 2024 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 7.125% Notes due 2024 |
| Trading Symbol | SCCB |
| Security Exchange Name | NYSEAMER |
| 6.875% Notes Due 2024 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 6.875% Notes due 2024 |
| Trading Symbol | SACC |
| Security Exchange Name | NYSEAMER |
| 7.75% Notes due 2025 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 7.75% notes due 2025 |
| Trading Symbol | SCCC |
| Security Exchange Name | NYSEAMER |
