Where the numbers come from
Each calculator uses published national cost guides, shown side by side on its page with the date they were checked. Where they disagree, the calculator shows the full range. Local prices can sit well above or below national ranges, so treat the result as a starting point for a conversation with a contractor, not a quote.
Pricing your own work? Start from your costs, not the market: the labor cost calculator works out what an hour of your crew really costs, and markup vs margin covers turning cost into a price.