Eleven Days of Drywall: An Anaheim 580 sq ft Garage-to-Office Conversion

The Anaheim job started on the first Monday of April. A 1985 detached three-car garage, 580 square feet of slab, converted to a permitted home office and guest suite. The drywall scope alone took eleven working days. Permits, framing, electrical, HVAC, and insulation wrapped around it. This is the week-by-week breakdown of what JNL Drywall delivered on the drywall side of the project.

The Scope Before the First Sheet Went Up

Garage conversions in Anaheim require a Type-B conversion permit, an updated electrical service review, and Title 24 envelope compliance for the new conditioned space. The drywall scope follows the building scope and cannot start until the framing inspection signs off.

For this project the framer had stud-walled the two outer garage walls to take R-21 batt insulation, dropped the original ceiling height by two inches to take a continuous service plenum for the new mini-split HVAC, and added two new partition walls dividing the 580 square feet into a 380-foot office and a 200-foot guest room with a closet. The new walls were 2×4 framing at 16 on center, fire-rated assembly at the original house-side common wall.

JNL Drywall’s scope was 1,840 board feet on walls and ceilings, fire-rated 5/8 sheet at the common wall, standard 1/2 sheet everywhere else, level-4 finish throughout, level-5 on the office ceiling. The level-5 ceiling was specifically called out by the homeowner because the office takes a north-facing skylight that would otherwise rake every taping flaw under daylight.

Week One: Hang, Tape, First Float

Monday morning the sheets arrived: forty-six 4 by 8 sheets of 1/2 standard, eight sheets of 5/8 Type-X for the common wall, and four sheets of green board for the guest room behind the new bathroom rough-in.

Hanging took a day and a half. The crew set the ceilings first, then the walls, screwed off at 12-inch spacing in the field and 8 inches on perimeter. Every fastener got a quick check for over-driving; a dimpled screw two thousandths too deep shows through a level-5 finish six weeks later in the right light.

Tape and first float started Wednesday morning. The job ran two finishers because the level-5 office ceiling needed its own dedicated attention. By end of Friday every seam carried tape plus first mud. The crew left Friday afternoon with the room dressed in mud but not yet sanded.

Week Two: Float, Sand, Texture Decision

Monday and Tuesday were second and third float on the walls. Wednesday was the sanding day. Two sanders, both rated for 1-micron filtration, ran on full negative-air pressure with a HEPA scrubber stationed at the doorway. Garage conversions in Anaheim’s older neighborhoods sit close to the main house’s HVAC return; dust control here is not theatrical, it is the difference between a clean conversion and a six-month dust problem inside the main home.

By Wednesday afternoon, walls were at level-4 finish, office ceiling was halfway through its level-5 skim pass, guest room ceiling was at level-4. Thursday was the second level-5 skim coat on the office ceiling. The crew burned a half day Friday floating, sanding, and re-floating two stubborn corners where the new partition wall met the existing common wall.

The texture decision happened mid-week. The homeowner had initially asked for matching knockdown to blend with the main house. The finisher walked the homeowner through the raking light from the skylight at 2 p.m. and at 4 p.m. They saw the difference. Smooth on the office ceiling, knockdown on the walls. The guest room got knockdown throughout to match the rest of the home. That decision shifted the level-5 line item by 380 dollars and added one finishing day, and was the right call.

Week Three: Prime, Paint, Final Walk

Monday of week three was prime. Sherwin-Williams ProBlock primer, one full coat on every surface, rolled and back-rolled. The primer revealed two pinholes on the office ceiling and one stress micro-crack on the guest room wall where the new partition met the original framing. All three got a level-5 spot-skim, fresh prime, light sand on Tuesday morning.

Wednesday and Thursday were paint. Two coats of Benjamin Moore Aura matte in Decorator’s White on both ceilings. Two coats of Aura eggshell in Revere Pewter on the office walls, and Classic Gray on the guest room walls per the homeowner’s color selection.

Friday was punch list. Three small touch-ups on the office ceiling caught in the late-afternoon skylight raking. One spot on the guest room baseboard line. Caulk run at every wall-to-ceiling transition with paintable acrylic. Two-step final walk-through with the homeowner: morning light at 9 a.m. and again at 4 p.m. with the skylight at peak raking.

The room signed off Friday at 5:15 p.m. Total drywall scope: eleven working days, no change orders past the texture decision in week two, no callbacks since.

What This Project Says About the Pillar

Garage conversions are where the drywall scope makes or breaks the final room. A garage with badly matched texture, dimpled fasteners, or a knockdown ceiling that catches every angle of skylight light reads as a converted garage forever. A garage with a level-5 office ceiling, smooth fastener pull, and an honest knockdown on the walls reads as a room that has always been a room.

The homeowner does not see the eleven days. They see the room. The eleven days are what makes the difference between “the bonus room out back” and “the office and guest suite we added in 2026.”

If a garage or attic conversion is in the pipeline for the next six months, request a free in-home assessment and JNL will scope the drywall package in detail before you sign with the framer. The drywall scope drives the calendar more than most homeowners expect, and getting it right at the start removes nine of the ten ways a conversion can go sideways.