Front Door Replacement Cost: Steel vs. Fiberglass vs. Wood

A front door replacement combines the door unit (material, configuration, glass, and finish) with installation labor. The single biggest choices that move the budget are the material, whether you buy a bare slab or a prehung unit, and whether you add sidelights, a transom, or upgraded hardware.

Every figure below is a relative range and an editable planning assumption, not a national average. Confirm the real number with a local quote.

Material is usually the largest driver of the unit price. The table shows relative cost (not dollar figures) and the trade-offs:

Relative positions shift with brand, glass, and finish, so treat the ordering as a planning guide rather than a fixed ranking.

How the door is supplied changes both cost and difficulty:

• Slab only. Just the door panel, no frame. It is cheaper and fits when your existing frame, jamb, and threshold are sound and square, and you are reusing the hinges and lockset locations. It demands precise fitting and mortising.
• Prehung unit. The door comes already hung in a new frame with hinges and sometimes bored for hardware. It costs more but installs more predictably and is the right call when the existing frame or threshold is damaged, rotted, or out of square.

A slab swap looks cheaper, but if the frame is compromised a prehung unit is often the honest choice.

Configuration and accessories add to both the unit and the install:

• Sidelights. Narrow glass panels beside the door widen the overall unit, add glass cost, and usually require a wider rough opening.
• Transom. A window above the door adds height and glass, and like sidelights can involve framing changes if you are adding one that was not there before.
• Glass inserts. Decorative or privacy glass in the door panel raises the unit cost over a solid panel.
• Hardware. A basic lockset is a small line item; a keypad or smart lock, a multipoint locking system, or premium handlesets add meaningfully. Confirm smart-lock compatibility with the door bore and thickness.
• Finish. A pre-finished or custom-painted/stained door costs more than an unfinished one you finish yourself.

Swapping a prehung unit into a sound opening is achievable for a confident DIYer, and a simple slab swap reusing existing hardware locations is simpler still. The work that drives cost — and difficulty — is setting the door plumb, level, and square, flashing and sealing against water, and reinstating trim and threshold. A door that is out of plumb will not latch or seal, and poor flashing can cause rot you pay for later.

As a safety and security note, an entry door is also a security element, so correct strike-plate anchoring and a properly aligned deadbolt matter as much as looks. Adding sidelights or a transom that were not there before, widening the opening, or any frame repair beyond a straightforward swap are jobs most homeowners are better off hiring out.

A like-for-like door replacement in the existing opening is often exempt from permits, but enlarging the opening to add sidelights or a transom can involve framing and, in a load-bearing wall, a structural header — which commonly requires a permit and inspection. Rules vary by jurisdiction, so confirm with your local building department rather than assuming.

• Budgeting the door unit only and forgetting installation, hardware, and finishing.
• Buying a slab when the frame or threshold is damaged and a prehung unit was the better value.
• Adding sidelights or a transom without accounting for the wider/taller opening and possible framing work.
• Choosing a smart lock without confirming it fits the door bore and thickness.
• Treating a national "average" as your quote. Always confirm locally.