How much does it cost to install new interior doors throughout a house in NB?

Replacing interior doors throughout a typical New Brunswick home costs $250-$600 per door installed, with a full house replacement of 8-12 doors running $2,500-$7,000 in total depending on door style, hardware, and whether the existing frames need replacement.

That per-door range reflects a meaningful spread in product choice. A standard hollow-core slab door in a two-panel or three-panel style — the entry-level option found in most NB builder-grade homes — costs $80-$180 for the door itself at any NB building supply outlet. Solid-core doors, which are significantly heavier, quieter, and more durable, run $200-$450 per door for standard sizes. Solid wood doors in pine, fir, or oak run $350-$700 or more per door depending on species, panel design, and whether they're pre-primed or unfinished.

Labour adds substantially to the per-door cost. Swapping a door slab in an existing, square, functioning frame — called a "slab-only" replacement — is straightforward work that a carpenter can complete in 30-60 minutes per door. That labour component typically runs $60-$120 per door. However, many door replacements in older NB homes are not straightforward. Houses built before 1970 often have non-standard rough openings, frames that have racked out of square over decades of settling, and door openings that are narrower than modern standard widths of 28, 30, or 32 inches. When a frame needs to be rebuilt or an opening needs to be modified, labour costs climb to $200-$400 per door and a structural assessment may be needed if the wall in question is load-bearing.

Pre-hung door units — where the door comes already mounted in a new frame — simplify installation when the rough opening is being reworked anyway. Pre-hung hollow-core units cost $120-$250 each while pre-hung solid-core units run $280-$550 each. Installation of a pre-hung unit takes longer than a slab swap because the frame needs to be shimmed and set plumb and square, but the finished result is a properly fitting door with correctly positioned hinges and strike plate.

Don't forget hardware when budgeting. Interior door knobs or lever handles typically run $30-$80 per door for mid-range sets; quality lever hardware with a lifetime finish warranty costs $80-$200 per door. Hinges are usually included with pre-hung units but need to be purchased separately for slab replacements — standard 3½-inch hinges run $8-$20 each and most doors need three. Adding up door, hardware, and installation for a solid-core pre-hung door with quality lever hardware lands you at roughly $500-$750 per door installed, all-in.

For a whole-house door replacement in NB, the most cost-effective approach is usually to tackle all the doors in one contractor engagement. A carpenter replacing 10 doors over two or three days will charge less per door than calling someone in for single-door jobs at different times. Get a fixed-price quote for the full scope rather than an hourly rate — it's easier to budget and holds the contractor to a defined deliverable.

Pocket doors and barn doors add cost and complexity. Pocket doors require opening the wall to install the sliding hardware and pocket frame — budget $600-$1,200 per pocket door installed in an existing wall. Sliding barn door hardware runs $150-$400 for the track and hardware kit plus the cost of the door panel itself, which is often a statement piece in reclaimed wood or glass-panel style at $300-$800.

Replacing interior door slabs is one of the more accessible DIY renovation tasks, provided the existing frames are in good shape and true. If the frame is square and the hinge mortises line up with the new slab's hinge locations, a careful homeowner with a chisel, drill, and patience can do a credible slab swap. Pre-hung installation is more demanding and benefits from two people. Any situation involving structural wall modification, load-bearing wall openings, or widening existing rough openings is firmly in professional contractor territory.

---

Looking for experienced contractors? The New Brunswick Construction Network connects homeowners with qualified professionals:

• Gionetterenovations
• Thirty Four Renovations