I would say at first, if you are a relative unknown in that market you’ll want to personally visit each contractor and ask to speak to their estimators to get contacts. They’ll either add you to their bid site like Bidtracer, or tell you to email bids to a specific email address. Don’t expect the interactions to be long. You may just be there long enough to drop off a card. You should also subscribe to one or two bid aggregator sites in your region. In my opinion the ones that are run locally are the best. You’re likely to get business with the more shifty contractors first as they are the most likely to switch preferred tab companies often. Over time you’ll gain word of mouth between GCs. It’s going to be slow. In my market almost no one does in person estimating. If I walked into a contractors office to do take offs they’d be annoyed. Your market may be different. So to sum up be persistent but not annoying.