Location plays a big role in the cost of a screen room, but an average screened-in pressure-treated wood porch will run about $145 per square foot in the Maryland; Virginia; and Washington, DC, areas.
When comparing bids, make sure you’re looking at comparable services. The price should include all plans, the permit, inspections, and clean-up. Clean-up is a significant factor that many contractors don’t add to their bids, but you should ensure it’s included. Inspection of the condition and quality of your porch ought to be planned at regular intervals, and for that, you can hire a local inspector. For example, someone who lives in the Maryland region should go for lead inspection Baltimore.