Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 22, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-37480
Entity Registrant Name	UNIQUE FABRICATING, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-1846791
Entity Address, Address Line One	800 Standard Parkway
Entity Address, City or Town	Auburn Hills
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48326
City Area Code	248
Local Phone Number	853-2333
Title of 12(b) Security	Common Stock, par value $.001 per share
Trading Symbol	UFAB
Security Exchange Name	NYSEAMER
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,733,147
Entity Public Float			$ 28.3
Entity Central Index Key	0001617669
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY