Exterior Door Replacement Cost: Entry, Back and Side Doors
An exterior-door replacement is a complete weather boundary. The price can include the slab, frame, threshold, hinges, lockset, glazing, weatherstripping, flashing, trim, removal, disposal, and interior or exterior finish. Patio sliders, French doors, and large multi-slide systems have different economics and are covered separately.
Decide what is being replaced
Start by identifying whether the project replaces only the slab, the complete prehung assembly, the threshold and frame, or the entire opening and surrounding finish. A front entry, back door, side door, and service door may all be called an exterior door while carrying different product, security, weather, glazing, access, and finish scopes.
Record the rough opening, finished opening, handing, swing, clear width, sill height, frame condition, exterior cladding, interior floor and trim, and any glass or sidelight. A door that fits the finished opening may not fit the rough opening after the frame is removed. Conversely, retaining a frame that is out of square or water-damaged can make a slab replacement a false economy.
Simple, typical, and complex scenarios
A simple same-opening replacement may include a standard prehung unit, removal, shimming, weatherstripping, threshold adjustment, trim, and disposal. A typical project may add custom size, glazing, upgraded hardware, interior patching, exterior trim, flashing, air sealing, and paint. A complex project may involve a damaged jamb, rot, masonry or stucco, a changed opening, a landing or accessibility change, older materials, or a high-wind product with specific installation requirements.
The door unit is only one line. Separate product, frame, glass, hardware, threshold, flashing, air sealing, cladding, trim, interior finish, access, protection, disposal, taxes, and conditional work. A quote that includes a door but not its threshold, lock, weather seal, or finish is not comparable with a complete installed system.
Performance and water management
ENERGY STAR’s U.S. criteria use climate-zone context and door glazing level; they do not make a material name or glass appearance a complete performance rating. Ask for the complete product information where energy or comfort matters. Weatherstripping, threshold fit, frame alignment, and installation perimeter can affect drafts as much as the door slab.
Building America guidance treats the sill or pan, jamb, head, weather seal, and connection to the wall drainage plane as an integrated opening. If the existing door leaked, ask where water entered and what will be opened to correct it. A new slab does not repair a failed threshold or wall transition.
Replacement versus repair
Repair may be more economical when the slab and frame are sound and the problem is a hinge, lock, seal, glass, adjustment, or finish. A slab can fit when the existing frame is square, the hinges and lock preparation match, and the threshold remains weather-tight. A complete prehung replacement becomes more plausible when the jamb, sill, threshold, alignment, or perimeter flashing is failing, or when several components must be replaced.
The right comparison includes the remaining service horizon and future part availability. A low product price can be offset by custom fitting, finish restoration, another service call, or recurring water damage. Ask for the expected outcome: close, latch, lock, seal, drain, and operate as intended.
Older homes and approvals
Removing door trim, paint, caulk, siding, plaster, or insulation can disturb older materials. EPA guidance generally covers paid work disturbing paint in pre-1978 U.S. housing; Canadian guidance warns about lead paint and asbestos-containing materials in older homes. Confirm assessment, containment, cleanup, qualified work, disposal, and current local requirements where applicable.
If the replacement changes the opening, landing, fire or wind performance, or accessibility path, verify the applicable local requirements and professional scope. Do not assume a permit or a particular product is required everywhere, and do not assume it is unnecessary because the opening looks similar.
A defensible estimate identifies the complete door system, opening condition, water and air controls, finish boundary, access, warranty, and concealed-condition trigger. Compare that finished outcome rather than the slab price alone.
Ask for the opening dimensions, product type, frame condition, sill and threshold, glazing, hardware, weather seal, flashing, trim, finish, disposal, taxes, warranty, and concealed-work allowance. Clarify whether the quote restores the existing landing and floor transition. Compare repair or slab alternatives only when the frame is truly sound. The useful number is the cost of a weather-tight, operable, finished door system, not the price of a slab alone.