Guess will just post my version maybe will be of some help to someone else.

CREATE FUNCTION [dbo].[weekday_dateadd] ( @startDate SMALLDATETIME, @Days INT, @SkipHoliday BIT = 1, @DayOnly BIT = 1 )

RETURNS SMALLDATETIME

AS

BEGIN

/*

Title: weekday_dateadd(2)

Author: Mark Wolff

Date: 11/18/2010

Purpose: Adds a specified number of weekdays to a given date allowing to SkipHolidays also

Examples:

SELECT dbo.weekday_dateadd(GETDATE(),90,DEFAULT,DEFAULT)

SELECT dbo.weekday_dateadd(GETDATE(),10,DEFAULT,0)

NOTE: Will not work past a few years

*/

DECLARE @endDate SMALLDATETIME

SELECT @endDate = date

FROM (

SELECT

ROW_NUMBER() OVER (ORDER BY date) Sequence

,CASE WHEN @DayOnly = 1 THEN Date ELSE Date + CONVERT(VARCHAR,@startDate,108) END Date

FROM dim_Date(NOLOCK)

WHERE DAYOFWEEK NOT IN ('Saturday','Sunday')

AND (CASE WHEN @SkipHoliday = 1 AND HolidayText IS NOT NULL THEN 0 ELSE 1 END) = 1

AND Date BETWEEN @startDate-1 AND DATEADD(d,@Days+@Days/7*3+20,@startDate)

)d

WHERE Sequence = @Days

RETURN @endDate

END

Did some basic testing seems to work 😛