1. Define the surface list
Separate walls, ceilings, trim, doors, cabinets, exterior siding, and specialty surfaces. Each category has a different production rate and preparation requirement, so combining everything into one number can hide the real labor.
2. Pick a production rate
Use a rate that matches the work method. Rolling open walls, cutting occupied rooms, spraying commercial space, and refinishing cabinets all move at different speeds. The best estimate starts with a realistic crew output, then adjusts for condition and access.
3. Convert hours into price
After man-hours are estimated, add loaded labor cost, materials, overhead, and target profit. Keeping these steps separate helps a contractor see whether a bid is low because the hours are wrong or because the business costs are missing.
4. Review risk before sending
Look for schedule limits, customer protection, surface repairs, color changes, lift rental, travel, cleanup, and warranty expectations. These items should be written into the scope or carried as contingency before the final number is sent.