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With an arched door, the frame is not a supporting afterthought. It defines the curve, receives the leaf, connects to the wall and influences trim, glass, threshold and weather details. A door can have the right visual style and still fail to suit the opening if the frame depth or arch geometry is assumed.
Measure the opening and the wall condition
Record width, straight-side height, spring line, centre height, wall or jamb depth, floor level and existing trim. Take photographs square-on and from an angle. Note uneven masonry, plaster returns, arch infill and any concealed frame that may need to be removed.
Coordinate frame, leaf and trim
Decide whether the door leaf, transom or frame carries the main curve. Check swing clearance, active leaf, hardware positions and the relationship to nearby windows. The outside casing and inside trim should be considered with the frame so the finished entrance does not lose the intended arch.
See the arched opening measurement guide and the main arched front door guide for the full sequence. Final structural and installation details should be confirmed on site.
Use the catalogue to compare complete units
Browse the arched door collection, especially the arched door with transom and sidelights. When you know the wall depth and approximate curve, submit them through the custom door brief so the frame can be discussed with the design.
Frame depth is especially important where an arched opening meets thick masonry, insulation, plaster returns or existing trim. A frame that is too shallow can leave awkward reveals; a frame that is too deep may change the finished sightline. Provide photographs of the wall from both sides and identify which trim is to remain.
Ask how the curve will be checked before fabrication. A template, site verification or approved elevation may be appropriate depending on the opening. The goal is not to create unnecessary paperwork; it is to make the geometry visible to the person responsible for the final fit.
