Document and Entity Information	6 Months Ended
	Jun. 30, 2012	Jul. 31, 2012
Entity Information [Line Items]
Entity Registrant Name	WELLS MID-HORIZON VALUE-ADDED FUND I LLC
Entity Central Index Key	0001374694
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		0