| Cover | Mar. 18, 2021 |
| Affiliate, Collateralized Security [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 18, 2021 |
| Entity File Number | 001-38545 |
| Entity Registrant Name | LANDSEA HOMES CORPORATION |
| Entity Central Index Key | 0001721386 |
| Entity Tax Identification Number | 82-2196021 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 660 Newport Center Drive |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Newport Beach |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92660 |
| City Area Code | (949) |
| Local Phone Number | 345-8080 |
| 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, par value $0.0001 per share | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | LSEA |
| Security Exchange Name | NASDAQ |
| Warrants exercisable for Common Stock | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Warrants exercisable for Common Stock |
| Trading Symbol | LSEAW |
| Security Exchange Name | NASDAQ |
