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A prehung wood exterior door arrives with the leaf already coordinated with a frame, but “prehung” does not remove the need to verify the opening. The package still needs a clear unit size, frame depth, threshold condition, handing, swing, hardware preparation and installation plan. These details are especially important when replacing an existing door or working with an opening that is not square.
Separate slab size from complete unit size
Ask whether each dimension describes the leaf, the frame outside dimension, the finished opening or the rough opening. Record measurements at more than one point and photograph the threshold, jambs, trim and floor transition. Our custom door measurement guide explains how to label the information.
Confirm the parts included in the package
Clarify the frame material and depth, threshold, weather details, hinges, lock preparation, stops, seals, glass and finish. Confirm which items arrive assembled and which are handled on site. The installer should verify access, support, squareness, flashing or waterproofing requirements and the final adjustment process.
For timber selection and ongoing care, see the wood front door guide and solid wood care guide. A prehung unit is convenient when the scope is clear, not when the opening is assumed.
Choose a design direction
Browse the exterior door collection and solid oak collection, then send the existing opening information through the custom door brief so the complete unit can be discussed.
Replacement work deserves a separate conversation from new construction. The existing frame may be retained, removed or hidden behind new trim; each route changes the unit size and installation sequence. Confirm whether the project needs a template, a site check or a builder’s final rough opening before a prehung package is approved.
Ask how the door will be supported during installation and how the threshold will meet the finished floor. Confirm the swing, handing and lock side on a plan or elevation rather than relying on a verbal description. Clear documentation reduces the risk of a correctly made unit being presented to the opening the wrong way around.
