v3.25.1
Cover Page
 12 Months Ended
Dec. 31, 2024
Document Information [Line Items]  
Document Type POS AM
Amendment Flag true
Entity Registrant Name Tectonic Therapeutic, Inc.
Entity Central Index Key 0001681087
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company false
Entity Small Business true
Entity Tax Identification Number 81-0710585
Entity Address, Address Line One 490 Arsenal Way
Entity Address, Address Line Two Suite 210
Entity Address, City or Town Watertown
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02472
City Area Code 339
Local Phone Number 666-3320
Entity Incorporation, State or Country Code DE
Entity Primary SIC Number 2836
Amendment Description This Post-Effective Amendment No. 1 (this “Post-Effective Amendment No. 1”) to the Registration Statement on Form S-1 (File No. 333-280909) (the “Registration Statement”), as originally declared effective by the U.S. Securities and Exchange Commission (the “SEC”) on July 30, 2024, is being filed to (i) include information contained in the registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, which was filed with the SEC on March 20, 2025 (the “Annual Report”) and (ii) update certain other information in the Registration Statement. The information included in this filing amends the Registration Statement and the prospectus contained therein. No additional securities are being registered under this Post-Effective Amendment No. 1. All applicable registration fees were paid at the time of the original filing of the Registration Statement on July 19, 2024.
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 490 Arsenal Way
Entity Address, Address Line Two Suite 210
Entity Address, City or Town Watertown
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02472
City Area Code 339
Local Phone Number 666-3320
Contact Personnel Name Daniel Lochner