I don't understand why there is always this question about material markup. If you supply the materials then you mark them up to cover :
Travel time and time at store to buy them
Storage of the materials
Interest on credit cards/supply houses etc.. depending on long these items sit in your shop before they are used on job
Warranty on these items which you are now responsible for.
If the customer questions your mark up tell them to buy it themselves and it is not covered by warranty. These types of customers remind of the people that drive across town to save $2 on gas but don't realize it costs them $3 to drive there.
Mark up materials no matter what type of work it is. If they do decide to get them on they're own then let them do just that... don't sit there and supply them a shopping list because the time you spend doing that is part of markup also.
Edited to remove Flaming comments.
[This message has been edited by dougwells (edited 07-02-2006).]
