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.
Compare a complete entry system
A door quote can describe a slab, a prehung unit, or a full entry assembly. Verify whether the price includes the frame, threshold, sill, weatherstripping, hinges, lockset, deadbolt preparation, glass insert, sidelights, brickmould, interior casing, and paint or stain. A low material figure may cover only the leaf, while another proposal includes delivery and installation of a complete weather-tight system.
The existing opening determines how much work surrounds the product. If the frame is square, dry, and firmly attached, a slab-only change may be possible. If the jambs, sill, or threshold are damaged or out of square, retaining them can make alignment and sealing difficult. Ask the contractor to identify the visible condition and explain how the frame will be checked once trim is removed. Any concealed rot or damaged flashing should have a written change-order process.
Glass, sidelights, and decorative transoms change both the unit price and installation weight. Ask whether the chosen glazing is appropriate for the door’s location and whether ratings apply to the complete assembly. Hardware can also range from a basic lockset to multipoint locking, electronic access, or a custom finish. Compare the actual functions and finish level rather than an unspecified “door package.”
A complete project budget includes removal and disposal, access and protection, threshold transition, flashing and air sealing, exterior trim or cladding, interior casing, paint, taxes, and any landing or framing work. The door installer may not include masonry or siding repair. If the opening size or configuration changes, price the structural design and wall restoration separately; this is no longer a routine same-size replacement.
For competing proposals, ask for the same product series, opening dimensions, swing, glass, frame material, finish, hardware, and installation method. Keep repair as an alternate when a sound door needs only a bounded adjustment or component. That gives the homeowner a meaningful comparison between restoring the existing system and buying a complete replacement.
Simple and complex replacement scopes
A same-size swap in a protected opening with a sound frame can have a relatively narrow scope: remove the old unit, install the matched product, seal the perimeter, adjust hardware, and restore limited trim. A custom entry with glass, sidelights, a changed swing, or a different frame material is a different product package. If the sill is wet or the opening is out of square, the work may expand to framing, flashing, cladding, or flooring transitions.
For an older home, ask what will happen if the contractor finds lead paint, asbestos-containing material, or concealed rot. Do not treat a hazard allowance as authorization for unplanned work. The quote should identify the survey or protection assumption, the party responsible for regulated work, and the approval point before removal or disturbance proceeds. Requirements vary by jurisdiction and project age.
If the selected door includes a performance rating, verify that the record belongs to the complete assembly and exact configuration. A product label does not establish that a field-modified opening, reused frame, or separate sidelight has the same rating. Compare ratings only when they apply to the units being quoted.
When a contractor proposes replacing the entire assembly, ask whether the old slab could be repaired or reused with a new frame. Conversely, if a slab-only replacement is proposed, ask whether the frame, threshold, and hinge locations have been checked for compatibility. The more components retained, the more important their condition and fit become. A part that is inexpensive to keep may require additional labor to align or seal.
A written proposal should also distinguish product warranty from installation workmanship. Ask who handles an air or water leak at the opening, which party will return for adjustment, and whether the warranty covers labor, transportation, and surrounding trim. Retain the model and installation documentation for later service. These records help identify the responsible party if a component or interface fails.
Clarify how the work will be sequenced
If removal exposes an unfinished wall, ask how the opening will be secured and protected before the new unit is ready. Confirm whether delivery, installation, and finish trades are scheduled in sequence and who is responsible if a custom product arrives damaged or late. These details matter for a primary entrance where the household needs reliable access and security.
The final invoice should identify the installed model, any substitutions, finish, hardware, and remaining exclusions. Photograph the frame and threshold before trim is installed if the homeowner wants a record of the flashing interface. Keep the warranty and installation invoice together so future service can identify the product and responsible parties.
If the home has an alarm contact, smart lock, or doorbell wiring, identify it before removal and ask whether reconnection is included. A separate electrician or low-voltage provider may be needed.
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.