Cover - $ / shares	3 Months Ended
	Mar. 31, 2026	May 14, 2026
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2026
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2026
Current Fiscal Year End Date	--12-31
Entity File Number	001-42506
Entity Registrant Name	CALLAN JMB INC.
Entity Central Index Key	0002032545
Entity Tax Identification Number	99-0931141
Entity Incorporation, State or Country Code	NV
Entity Address, Address Line One	244 Flightline Drive
Entity Address, City or Town	Spring Branch
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78070-6241
City Area Code	(830)
Local Phone Number	438-0395
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	CJMB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		5,646,118
Entity Listing, Par Value Per Share	$ 0.001