Make more profit
OK so you’ve designed and fitted the customers signs be they whatever, you now have all the customers relevant info stored on your computer, what else can you sell them?
Ever thought of where they get their printing from? there are plenty of trade only print firms on the web so why not start simple and offer the customer 500 full colour business cards all flash like their signage, have a ring round the local print firms and get quotes for 500 full colour cards, remember all the artwork is almost done all you have to do is transfer the info onto a smaller size (although designing for print is a little different than signs, I worked in printing for 15 years).
2 of the companies I use are http://www.rcs.plc.uk and http://www.printing.com they charge £28.50 and £40 respectively for 500 full colour business cards, local printers around here the cheapest price I was quoted was £89.50 so I sell them at £85 but bear in mind that they have to do the artwork and yours is almost all done. Also I am in what is known locally as the “back of beyond” here in the sticks so obviously alter your selling prices for your area accordingly.
If you are going to try this make sure you get their print buying catlogues first, cos they come with the relevant info for preparing files for print and it helps if you spend some time to understand CMYK printing and they all take Corel Draw files.
Last month i sold 14 sets of business cards thats £1190 for £399 cost all plus vat, remember all the artwork you have all ready designed, so you should have already charged for that.