OK questions -
1) You need to ask about budget. Cause you say that and they might think that but you do the work and flop down a bill for 5k, that is not the time to discuss the budget lol. And it will steer you in the right direction as far as equipment.
2) Do they have a business internet connection? 14 people on a single normal connection they are getting fairly normal speeds. Unless that 5 - 10 is only on their LAN? But you need to find out if they are unhappy with the speed to the internet and/or on their LAN. I'm guessing both lol
3) What is the band of the wireless? b? g? n?
4) Have you done a site survey for other wireless signals? It could be they are using a heavily used channel.
If they have their hearts set on being wired.
You need to go there with a tape measure. You need to know where the network equipment is going, it can't just be sitting around where someone could bump into it or something. You need to figure out where and how the cable drops are going to be located. Take some measurements once you know where the equipment is going so you know if you want to make cable or just buy pre-made.
5) Are they going to expand in that location? If they have empty offices pulling a few more cables isn't too difficult and will make the expansion easier.
6) Are they still going to need wireless?
7) How many printers and where are they going to be located?
I think you get the picture, till you go there and have a look there's not much more you can do. Do NOT take someone's word for how something is, go there yourself and see what's what. Ask questions. Get a point of contact that you can call if you have other questions.