We will look at any job, discuss options, scenarios and even do some foot work ( engineering feasibility, municipal concerns, set backs, restrictions, flood plane, ect...) free of charge. We will give a good idea what a typical project in that range would cost for us to build.
To generate a solid scope of work and a spec book or table of allowances, we charge for that. One of the additions (fairly simple room addition and car port enclosed and converted to living space) we just finished, the scope was 16 pages, and there was a seperate Table of Allowances, as well. They signed a simple PSA and paid the fee, as we have been doing for several years. Design was charged for as well, all a package deal.
If we were slow and it was a deal killer, or the market was tough again, we'd probably pause in the practice.
We do lose some opportunities to bid jobs this way, but we close most of the ones who pay for it.
We show them a template scope and an example of a Table of Allowances or spec chart, and some plans during the interview process. Works pretty well.
These are for major projects ( at least relative to our company), an exterior renovation, or simple project we generally dont charge for it.
After the last hail storm I charged $100 for a bid on a roof replacement, siding, windows, paint.... credited back if we got the job.
On a PSA situation, the fee is not credited back, or at least not as of the last year. If we need to book something and its a deal killer I imagine we'd look at that option.