Interior Door Installation in Toronto & the GTA
Professional interior door installation in Toronto and the GTA for existing homes, renovations and new construction. Miter5 installs slab, prehung, solid-core, French, pocket and specialty interior doors with careful attention to fit, alignment, jambs, hardware and surrounding trim.
Interior Doors Installed for Existing Homes, Renovations & New Construction
Interior door installation is not one-size-fits-all. Some projects involve fitting new door slabs into existing jambs, while others require complete prehung assemblies, new frames or specialty hardware. Miter5 installs interior doors according to the opening, the door type and the finished result the space requires.
The Right Installation Approach for the Existing Opening
Replacing an interior door does not always mean removing the entire frame. When an existing jamb is straight, secure and suitable for reuse, a new slab door can often be carefully fitted to the opening, mortised for hinges and prepared for the latch and hardware.
When the jamb is damaged, poorly aligned or being replaced as part of a renovation, a prehung door assembly may provide the better solution. The opening, flooring, wall thickness, casing and adjoining trim all need to be considered before deciding which approach makes sense.
Slab Door Replacement
New door slabs fitted to suitable existing jambs, including sizing, hinge preparation, latch positioning and final adjustment for consistent clearances and smooth operation.
Prehung Interior Doors
Complete door-and-jamb assemblies installed in new or renovated openings when the existing frame is being removed or a completely new opening is being finished.
Solid-Core Door Upgrades
Replace lightweight builder-grade hollow-core doors with heavier solid-core doors where homeowners want a more substantial feel, improved privacy or a higher-end interior finish.
French & Double Doors
French and paired interior doors require careful alignment at the centre meeting point, consistent reveals and accurate hardware positioning so both doors operate and present properly.
Pocket & Space-Saving Doors
Pocket doors and other sliding systems require the door, track, framing and finished opening to work together. Miter5 can install and finish these systems as part of a renovation or interior carpentry project.
Specialty & Custom Openings
Unusual dimensions, concealed doors, angled openings and other specialty installations often require a finish-carpentry approach rather than simply installing a standard prehung unit.
What Professional Interior Door Installation Actually Involves
A door can be perfectly manufactured and still perform poorly if the opening, jamb, hinges or hardware are not installed correctly. Professional interior door installation starts with the condition of the opening and continues through the final adjustment of the door.
Miter5 approaches interior doors as finish carpentry. That means the door itself, the jamb, reveals, hinges, latch, casing and adjoining trim are considered together so the finished opening looks intentional and the door operates properly.
Existing homes rarely provide perfectly identical openings. Small differences in framing, flooring, wall thickness or previous renovations can affect how a new interior door needs to be fitted.
Measure the Opening
The width, height, wall thickness and condition of the existing jamb are reviewed before deciding whether the project is best handled as a slab replacement or a complete prehung installation.
Check the Jamb & Opening
Openings that are out of square or jambs that are twisted, damaged or poorly installed can affect clearances and how the door closes. These conditions need to be identified before fitting the new door.
Fit the Door & Establish Reveals
The door is fitted so the margins around the top and sides are visually consistent while allowing the appropriate clearance at the floor.
Mortise & Align the Hinges
Accurate hinge locations and mortises help support the door, maintain alignment and prevent binding. This becomes especially important when installing heavier solid-core doors.
Prepare the Latch & Hardware
Locksets, passage hardware and strike plates must align correctly so the door closes naturally without needing to be lifted, pushed or forced into position.
Finish the Casing & Final Adjustment
Door casing completes the opening and connects it visually to adjoining baseboards and trim. The finished door is then checked for swing, closing, clearances and hardware operation.
Interior Door Installation Across Toronto & the GTA
The right installation approach often depends on the home itself. Older Toronto houses, renovated interiors and newer GTA homes can present very different conditions at the door opening, jamb, floor and surrounding trim.
Older Toronto Homes
In older houses, settled framing, plaster walls, previous renovations and openings that are no longer perfectly square can make a standard replacement more involved. A new door may need to be fitted to the existing opening rather than assuming every jamb is straight and uniform.
Renovated Interiors
Flooring changes, rebuilt walls, new casing and updated baseboards can all affect the final door installation. During a renovation, the door opening needs to coordinate with the surrounding finish carpentry so the completed room looks consistent rather than pieced together.
Newer GTA Homes
Many newer homes are upgraded by replacing builder-grade hollow-core doors with heavier solid-core or more detailed interior doors. Whole-home replacements require consistent heights, reveals, hinge locations and hardware so the new doors read as one coordinated finish package.
For a single replacement door, a group of bedroom doors or a larger renovation, Miter5 evaluates the actual opening before determining how the new door should be installed.
Interior door installation is available for residential projects throughout Toronto and the GTA, including projects where new doors need to coordinate with casing, baseboards and other finish carpentry.
Interior Door Installation FAQs
Answers to common questions about replacing, fitting and installing interior doors in Toronto and GTA homes.
How much does interior door installation cost in Toronto?
The cost depends on the type of door and the condition of the existing opening. Installing a replacement slab into a suitable existing jamb is different from removing the frame and installing a complete prehung door.
Door weight, hinge preparation, hardware, jamb repairs, casing, modifications to an out-of-square opening and the number of doors can all affect the final price. Miter5 reviews the project details before providing a quote rather than applying one fixed installation price to every opening.
Can you replace an interior door without replacing the frame?
Yes. If the existing jamb is secure, reasonably straight and in good condition, a new slab door can often be fitted to the existing frame.
The slab still needs to be sized for the opening, mortised for the hinges and prepared for the latch and hardware. If the jamb is damaged, twisted or poorly installed, replacing the complete assembly may provide a better finished result.
What is the difference between a slab door and a prehung door?
A slab door is the door itself without a new jamb. It is commonly used when an existing frame can remain and the new door is being fitted to that opening.
A prehung door comes mounted in a new jamb assembly and is generally used when the existing frame is being removed, a new opening is being created or replacing the complete door and jamb provides the better installation.
Can Miter5 replace hollow-core doors with solid-core doors?
Yes. Replacing builder-grade hollow-core doors with solid-core doors is a common interior upgrade.
Because solid-core doors are considerably heavier, hinge placement, jamb condition and fastening are particularly important. The existing opening should be evaluated before assuming the heavier door can simply use the previous setup.
Does Miter5 install French doors and double interior doors?
Yes. Miter5 installs French doors and paired interior doors. Alignment is especially important because the centre meeting point, top margins and overall reveals need to remain consistent across both door slabs.
Does Miter5 install pocket doors and barn doors?
Yes. Pocket and barn doors can be installed as part of an interior renovation or finish-carpentry project.
Pocket doors depend on the framing, track and wall cavity being properly prepared, while barn doors require suitable wall structure, track placement and clearance.
Can you install doors in openings that are not square?
Yes, but the condition of the opening affects the installation approach. Older homes and previously renovated spaces frequently have jambs or framing that are no longer perfectly level, plumb or square.
The opening needs to be assessed so the finished door can maintain appropriate reveals, swing freely and close correctly.
Do you install the door casing as well?
Yes. Door casing and surrounding trim can be included when required. Casing covers the joint between the jamb and wall and completes the architectural finish around the opening.
During renovations, casing can also be coordinated with adjoining baseboards and other trim so the new door fits naturally with the rest of the room.
Planning an Interior Door Installation Project?
Whether you are replacing one interior door or updating doors throughout an entire home, tell Miter5 what you are working with. We can review the door type, existing openings and project scope and determine the right installation approach.
Interior door installation, replacement and finish carpentry for homes throughout Toronto and the GTA.