When searching for someone to do a piece of job for you, the selection process is basically driven by type of job and cost. Certain service-oriented tasks, which can be handled via emails and phone calls, can be offered to providers from all over. Jobs which need onsite presence normally call for local handlers to reduce travelling costs incurred by offshore workers.
The easiest and most common method to sourcing local window dealers is to let your fingers do the walking. Whether be the local phone directory or the web listing, this is a place to start. However, the list will be too long and doesn’t give any indication on which the dealers of good reputation are. Alternatively, you can check with your friends and colleagues for a list of recommended places to go to.