How Long Does Door Installation Take? Timelines and What to Expect

How Long Does Door Installation Take? Timelines and What to Expect

Most homeowners in Los Angeles start researching Door Installation with a simple question: how long will the crew be in my house? The honest answer frustrates people because it depends. A standard prehung interior door swap can be done before lunch. An exterior door with a rotted frame, a new sidelight, and a permit inspection can stretch across a week. This guide breaks down the actual timelines for four different scenarios, explains what crews do during the hours you don’t see, and gives you one specific question to ask before booking that will tell you more about a contractor than any review ever could.

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Quick Answer

A single prehung interior door replacement typically takes 2 to 4 hours. A standard exterior prehung door takes 4 to 8 hours, similar to How Long Does Window Installation Take? Timelines and What to Expect. Exterior doors with frame repair or stucco work take 1 to 2 days on site, and cutting a new rough opening into an existing wall takes 2 to 3 days plus permit inspection time in Los Angeles.

Table of Contents

• Interior Door Replacement: 2 to 4 Hours
• Exterior Prehung Door: 4 to 8 Hours
• Exterior Door with Frame Repair or Sidelights: 1 to 2 Days
• New Rough Opening in an Existing Wall: 2 to 3 Days Plus Permits
• What the Crew Does When You’re Not Watching
• How Hardware Selection Changes the Timeline
• Why Permit Inspections Add Days in Los Angeles
• The One Question to Ask Before You Book

Interior Door Replacement: 2 to 4 Hours

Interior door replacement is the fastest job on this list, but only when the rough opening cooperates. A prehung interior door arrives with the slab already attached to the jamb by hinges. The crew removes the old casing, pulls the old jamb, sets the new prehung unit into the opening, shims it level, nails the jamb in place, and reinstalls the casing. If the door was ordered pre-bored with the correct lockset backset, the hardware goes on in fifteen minutes.

Where interior jobs go long is when the framing is off. In older Los Angeles homes, many from the 1920s through the 1950s, we regularly see rough openings that are out of square by half an inch or more. Framing lumber shifts over decades. The plaster walls don’t flex the way the studs do. That means the crew spends extra time shimming, planing, and adjusting the jamb to get a clean reveal around the slab. Add 45 to 90 minutes if the opening needs significant correction.

What does a two hour interior door job look like from the homeowner’s side? The technician lays down a drop cloth, covers the nearby furniture with plastic sheeting, and removes the old casing with a pry bar. The old jamb comes out in sections. The new unit goes in, gets checked with a four foot level on both jambs and the head, and gets shimmed at the hinge locations. The slab is test swung. The latch is checked. The casing goes back on, nail holes get a quick fill, and the area is swept. The C.A.R.E. values matter on a job this fast: clean up like it’s our own home, ask before moving anything, respect quiet hours if there’s a napping child. A two hour job should leave no trace except a new door.

Exterior Prehung Door: 4 to 8 Hours

An exterior prehung door follows the same process as an interior one, but with three additions that double the time: flashing, insulation, and exterior trim. The rough opening gets stripped down to bare framing. The sill pan is installed to direct water away from the structure. The new unit is set, leveled, and fastened. The gap between the jamb and the framing is insulated with low expansion foam. Flashing tape goes over the exterior fins. The brickmould or stucco trim is reinstalled, and the threshold is sealed.

In Los Angeles, exterior door work often involves stucco. If the door has a stucco return, the crew needs to cut back the stucco cleanly, set the door, and then patch the stucco to match. Matching a float finish or a sand texture takes skill and dry time. A straightforward exterior prehung on a wood framed wall with wood siding might run four hours. The same door on a stucco home in Eagle Rock or Silver Lake can push to six or eight hours because of the finish work.

Weather sealing is the part that should not be rushed. A door that swings freely on installation day but leaks during the first winter rain is a failure. The gap under the threshold gets a continuous seal. The corner joints at the sill and the jambs get caulked. The weatherstrip gets checked against the slab with a dollar bill test: shut the door on a dollar bill, and if it slides out easily, the seal needs adjustment. These details take time, and skipping them is how a four hour job becomes a callback.

Exterior Door with Frame Repair or Sidelights: 1 to 2 Days

This is where the timeline splits from the prehung scenario. If the existing jamb has rot, or if the rough opening needs reframing, the job is no longer a swap. It’s a repair plus an installation. In our experience across Los Angeles neighborhoods from the Valley to the Westside, frame rot hides behind old caulk and paint. A jamb that looks solid on the surface can be soft inside from years of sprinkler overspray or a missing drip cap.

Day one is demolition and repair. The old door and jamb come out. The rotted section of framing is cut back to sound wood. New treated lumber is installed. If the sill plate is compromised, that gets replaced too. The opening is re squared and re leveled. This is not the kind of work that should be raced through. A properly repaired rough opening will hold a door square for decades. A rushed repair will sag in two years and bind the slab.

Day two is the actual installation, plus any stucco or trim work around the opening. If the project includes sidelights, the rough opening is wider, which means more framing, more glass, more flashing, and more finish work. A door with two sidelights is essentially three window units and a door in one opening. That’s not a four hour job. Plan for a full day on any exterior door with frame repair, and two days if sidelights or significant stucco patching are involved.

New Rough Opening in an Existing Wall: 2 to 3 Days Plus Permits

Cutting a new door opening into an existing exterior wall is the longest and most involved scenario. This is not a door replacement. It’s a structural modification. The crew must determine whether the wall is load bearing, install a properly sized header, cut the wall open, frame the new opening, install the door, and patch both the interior drywall or plaster and the exterior stucco or siding.

In Los Angeles, this work requires a building permit. The permit triggers a plan review and an inspection schedule, which means the physical work on site might span two days, but the entire process from permit application to final inspection can take two to four weeks depending on the city’s current workload. The on site work breaks down like this: day one is demolition and framing, including the header and any temporary support walls if the wall is load bearing. Day two is door installation, waterproofing, and the start of the finish work. Day three, if needed, is stucco patching, drywall finishing, painting, and trim.

We always tell Los Angeles homeowners to plan around the inspection calendar, not the construction schedule. The inspector comes when the inspector comes. You can’t schedule an inspection for 2:15 on a Tuesday. The city gives you a window, sometimes a full day. The inspection itself takes ten minutes. The waiting is the tax on structural work in Los Angeles.

What the Crew Does When You’re Not Watching

Most of the door installation hours a homeowner pays for happen when it looks like nothing is happening. The door is in the opening. The level is out. The shims are going in and coming out and going in again. This is the work that separates a door that closes perfectly for twenty years from one that sticks every summer.

Here is what the crew is actually doing in those hours:

1. Squaring the opening. The jamb must be plumb on both sides and level across the head. If the rough opening is off, the jamb gets shimmed until it is right. This can take twenty minutes or two hours depending on how far out the framing is.
2. Shimming at the hinges. The hinge side is set first. Shims go behind each hinge plate, not randomly along the jamb. This gives the slab proper support and prevents sag over time.
3. Insulating the gap. The space between the jamb and the framing gets filled with low expansion foam. In Los Angeles, this matters for both temperature and sound. It also blocks the fine dust that blows in through unsealed gaps on windy days.
4. Testing the swing and latch. The slab gets opened and closed a dozen times. It’s checked at multiple points along the arc. The latch is tested for positive engagement. The deadbolt, if present, is thrown and retracted repeatedly.
5. Final adjustment. Hinges get a final tighten. The weatherstrip is checked. The threshold is adjusted if it’s adjustable. The casing is nailed off and caulked.

None of this is visible in a time lapse video. It looks like standing still. It is the entire job.

How Hardware Selection Changes the Timeline

Hardware decisions made before installation day can add or subtract hours from the project. The biggest variable is whether the door slab arrives pre bored or not. A pre bored door has the lockset holes and the latch bore already drilled at the factory. The hardware installs in minutes. A non bored door has to be drilled on site, which adds time and introduces the risk of splintering or misalignment.

Here is what to check before the crew shows up:

• Backset. The standard backset is 2 3/8 inches from the edge of the door to the center of the knob or lever hole. Some hardware, particularly oversized entry sets, requires a 2 3/4 inch backset. If the door is pre bored for the wrong backset, the hardware won’t fit without modification.
• Bore diameter. Standard modern doors use a 2 1/8 inch bore. Some antique hardware and some European hardware uses smaller or non standard bores. Confirm the bore size before ordering.
• Hinge prep. Prehung doors come with hinge mortises cut for a specific hinge size and corner shape. Square corner hinges don’t fit radius corner mortises without chisel work. If you’re reusing old hinges on a new prehung door, check the corner profile.
• Deadbolt prep. Exterior doors should have a deadbolt. If the slab does not have a separate deadbolt bore, that hole has to be cut on site. It’s not hard, but it adds time and creates sawdust inside the home.

At Lightwell Windows & Doors, we carry entry systems from Therma-Tru and Mr-Glass, among others, and we help Los Angeles homeowners order the door with the right hardware prep from the start. A door ordered correctly for the hardware it will wear installs faster and with less on site drilling. When you’re comparing prices, ask whether the quote includes the hardware prep or whether that gets billed as extra labor on installation day. A written line item quote answers that question before it becomes a surprise.

Why Permit Inspections Add Days in Los Angeles

A door replacement in the same rough opening does not require a permit in most Los Angeles jurisdictions. A new opening cut into an exterior wall does. The Los Angeles Department of Building and Safety requires plan review and field inspection for structural modifications. This is not a contractor being slow. It’s the system working as designed.

The inspection process works like this:

1. Permit application. The contractor submits drawings showing the existing wall, the proposed opening, the header size, and the connection details. Plan review typically takes 1 to 2 weeks depending on the city’s volume.
2. Issuance. Once the permit is approved, the contractor pays the fee and receives the permit card that must be posted on site.
3. Framing inspection. After the opening is cut and the header is installed but before any finish materials cover the work, the inspector comes out to verify the structural work matches the approved plans.
4. Final inspection. After the door is installed and the finish work is complete, the inspector returns to sign off on the entire project.

The time between requesting an inspection and getting one can be 1 to 5 business days in Los Angeles. Sometimes same week if the inspector’s route has slack. Sometimes longer in summer when construction volume peaks. The homeowner’s job is not to chase the city. The contractor handles the scheduling. The homeowner’s job is to be patient and understand that the delay is not the crew sitting idle while your door hangs half finished. The door is in. The work is done. The city just hasn’t verified it yet.

Keith Yamada’s guidance on this is straightforward: a trustworthy contractor tells you about the inspection window before you sign the contract, not after the opening is cut. If a contractor quotes a new exterior door opening as a two day job with no mention of permits, walk away. You’re being quoted for work that will trigger a stop work order and a fine, and you’ll be the one dealing with it.

The One Question to Ask Before You Book

There is a simple question that reveals more about a contractor’s honesty than any review, any portfolio photo, or any sales pitch. Ask it during the estimate: “What would make this take longer than your estimate?”

A trustworthy answer sounds specific. It names actual conditions: “If the rough opening is out of square by more than half an inch, we’ll need extra time to correct it.” Or: “If we find rot in the sill plate when we pull the old door, that adds half a day for the repair.” Or: “If the stucco doesn’t match after patching, we may need to texture and repaint the entire wall section, which adds a day.”

A vague answer is a warning sign. “Oh, nothing, it always goes smoothly.” Or: “We’ll figure it out if we hit anything.” Every contractor who has done more than a handful of installations has hit surprises. Rotted framing. Out of square openings. Incorrect hardware prep. Buried electrical lines in the wall where the new opening goes. A contractor who says surprises never happen is either lying or inexperienced, and neither is good.

This question does something else, too. It tells you whether the contractor thinks in terms of your home or their schedule. A contractor who has already thought through the failure modes is one who has planned for them. At a minimum, the answer should cover framing condition, stucco matching, and inspection scheduling if the work is structural. At Door Installation in Los Angeles, we walk through these variables during the estimate so the written price reflects the actual job, not a best case scenario.

Common Mistakes to Avoid

• Assuming every door quote covers the same scope. Some Los Angeles contractors quote the door only, then bill extra for the old door removal, the haul away, the hardware drilling, and the trim. A written line item quote prevents this. Ask what the price includes and what it doesn’t.
• Ordering a door before measuring the rough opening. Doors are not one size fits all. A slab that is too tall for the opening means an hour of planing, and a slab that is too short means a gap at the bottom. Measure the rough opening, not the old door, and have the contractor confirm the numbers.
• Scheduling a new opening without checking the permit timeline. In Los Angeles, structural work without a permit can trigger fines and stop work orders. Confirm the permit requirement and the inspection window before you commit to a date.
• Reusing old hardware on a new prehung door without checking compatibility. The old hinges might not match the new mortises. The old lockset might not match the new bore. The old strike plate might not align with the new jamb. Small mismatches compound into hours of on site adjustment.
• Ignoring the weather seal. Exterior doors in Los Angeles face morning marine layer moisture, afternoon sun, and the occasional winter downpour. A poorly sealed threshold leaks in ways that aren’t visible until the hardwood floor swells. Confirm the flashing and sealing plan before the door goes in.
• Choosing the cheapest quote without reading the exclusions. A low quote that excludes haul away, stucco repair, and hardware installation is not cheaper. It’s the same price with the line items hidden. Get the full scope in writing from every bidder.

When to Call a Professional

Door installation sits in that gray zone where it looks doable until you’re thirty minutes in and the jamb won’t come out. If the job is a simple interior door swap on a square, plumb rough opening, a skilled homeowner with the right tools can manage it. If the job involves an exterior door, stucco, rot repair, a new opening, or a door that will keep your family safe and your home sealed against the elements, call someone who does this every day. The cost of a botched exterior installation in Los Angeles is measured in water damage, air leaks, and a door that stops latching in year three. Lightwell Windows & Doors offers free estimates in Los Angeles. Call (562) 478-8017 and we’ll walk the job with you, measure the opening, and put the full scope in writing before any work starts.

Frequently Asked Questions

The Bottom Line

The honest answer to “how long does door installation take” is: 2 to 4 hours for a simple interior door, 4 to 8 hours for a standard exterior prehung, 1 to 2 days when frame repair or sidelights are involved, and 2 to 3 days on site plus permit inspection time for a new rough opening. For comparison, see How Long Does Window Replacement Take? Timelines and What to Expect. The variables that stretch the timeline are predictable if you know to look for them: the condition of the rough opening, the hardware prep, the stucco work, and the inspection calendar. Ask the contractor what would make the job take longer than the estimate, and listen for specifics. A contractor who can name the failure modes is one who has prepared for them. That’s the difference between a door that closes perfectly for twenty years and one that starts sticking in the second summer.

Written by Keith Yamada, Owner at Lightwell Windows & Doors, serving Los Angeles since 2010. For more guides & resources, visit our blog.