Drywall Repair Mistakes to Avoid in San Diego ADUs and Garage Conversions

Drywall Repair

San Diego is booming with accessory dwelling units (ADUs) and garage conversions—and for good reason. These compact living spaces are perfect for family, rental income, or even that dreamy home office. But one thing often overlooked in the excitement? Drywall repair and installation. And trust us—bad drywall work can turn your high-end ADU into a low-budget headache.

At SGP Drywall, we’ve worked on enough conversions to know where most people slip up. From code violations to wavy walls, we’ve seen it all. So whether you’re upgrading a detached garage in North Park or building out a sleek ADU in La Jolla, this guide will help you dodge the most common drywall disasters.

Why Drywall Matters So Much in ADU Conversions

Sure, it’s not the flashiest part of your build. But drywall plays a massive role in insulation, energy efficiency, soundproofing, and how your space feels. A poorly done drywall job in your ADU or garage can cause:

  • Uneven finishes and visible seams
  • Moisture buildup and mold issues
  • Failed city inspections due to drywall code compliance problems
  • Reduced energy efficiency and higher utility bills
  • Costly repairs right after your “new” space is finished

If you’re thinking, “It’s just drywall,” think again. Cutting corners here can throw off the entire build.

The Most Common Drywall Repair Mistakes in San Diego ADUs

Converting a garage or building an ADU in San Diego sounds like a great idea—until drywall becomes a roadblock. From choosing the wrong materials to skipping crucial inspections, these common mistakes can cost time, money, and even permits. Below, we break down the most frequent drywall repair slip-ups we see in local conversions—and how to avoid them.

Mistake #1: Not Understanding San Diego ADU Regulations

Before you touch a single screw or tape a seam, you need to know the rules. San Diego has strict ADU regulations, including minimum room sizes, egress windows, and—yes—drywall that meets fire and energy codes.

Why It’s a Problem:

Ignoring these can delay your project, cause failed inspections, or lead to expensive rework. We’ve seen homeowners tear out entire walls because they didn’t meet wall thickness requirements or skipped soundproofing requirements in shared walls.

Fix It:

Always work with a contractor who understands ADU standards in San Diego. Pull permits, check setback limits, and use materials that meet California Title 24 energy codes.

Mistake #2: Skipping Insulation and Drywall Pairing

You can’t have an energy-efficient ADU without the right insulation and drywall pairing.

Why It’s a Problem:

A lot of DIYers install drywall first, then “figure out” insulation. But that’s backward. You need insulation to be properly fitted and sealed before your drywall goes up. Otherwise, you’ll end up with:

  • Drafts
  • Hot spots
  • Failed blower door tests (required for new ADUs)

Fix It:

Use batt insulation for walls, foam board for garages, and consider rock wool for better sound absorption. Seal all penetrations before drywalling. This is critical for achieving energy efficiency in drywall repairs and builds.

Mistake #3: Ignoring Moisture Control in Garages

Even in sunny San Diego, moisture can sneak in—especially in older garages. Once that damp air hits unprotected drywall, it’s game over.

Why It’s a Problem:

We’ve redone more than a few garage drywall repair disasters caused by water damage. Think bubbling paint, mildew smells, and soft, crumbly patches.

Fix It:

  • Elevate drywall off the slab floor by at least ½ inch.
  • Use vapor barriers or rigid foam boards.
  • Opt for moisture-resistant drywall.
  • Add proper ventilation in converted garages.

Moisture control is essential in garage conversions if you want longevity and livability.

Mistake #4: Not Planning for Utilities Behind the Walls

So you’re patching up your newly installed electrical or plumbing lines. Great. But if you’re rushing the drywall job just to hide the wires, you’re asking for trouble.

Why It’s a Problem:

  • You might need to open up the wall again.
  • Bulging seams and cracked corners are common.
  • Inspection fail? That’s a full teardown.

Fix It:

  • Document your utility layout before closing up walls.
  • Use access panels where needed.
  • Wait for inspections before finishing the drywall.

Nothing’s worse than patching your fresh wall because of avoidable errors.

Mistake #5: Rushing the Finish

Finishing is the hardest part of drywalling—and rushing it can ruin the look of your entire ADU.

Why It’s a Problem:

  • Poor taping causes visible lines.
  • Sanding too early creates pits and ridges.
  • Skipping texture blending results in an obvious patch job.

Fix It:

Take your time. Apply multiple thin layers of joint compound. Use proper taping techniques at corners and seams. Let each coat dry thoroughly before sanding. If your ADU features textured walls (like many in San Diego), match it carefully with spray texture or a pro’s touch.

Mistake #6: Doing It All Yourself (When You Shouldn’t)

Drywalling an ADU or garage conversion isn’t the same as fixing a hole in your living room wall. The stakes are higher—literally, because of safety, compliance, and resale value.

Why It’s a Problem:

Even skilled DIYers can get in over their heads with large jobs. And let’s be honest—once you factor in tools, time, and redo work, you might end up spending more than if you’d hired a pro.

Fix It:

Hire licensed drywall repair contractors in San Diego who understand the unique challenges of building ADUs and converting garages. We’ll ensure your project is beautiful, code-compliant, and built to last.

Garage to Studio Conversion Tips: Don’t Skip These!

If you’re planning to turn that underused garage into a rental or office, here are a few smart drywall-related tips:

  • Use soundproofing materials for privacy.
  • Plan your outlet and lightbox placements before drywalling.
  • Go for light-colored paint to brighten the space.
  • Check for cracks in the slab—fix them before the walls go up.
  • Frame walls correctly to allow for insulation and drywall pairing.

San Diego’s weather may be mild, but proper planning can make the difference between a dreamy studio and a moisture trap.

SGP Drywall Knows ADUs Inside and Out

Drywall Repair

Don’t let your ADU project fall apart over drywall. At SGP Drywall, we specialize in drywall for ADUs, garage drywall repair, and helping homeowners avoid common remodeling missteps. Whether you’re converting a garage, building a backyard unit, or just trying to stay within the city’s tight compliance codes—we’ve got the tools, team, and know-how to help.

Call SGP Drywall today for expert installation, patching, finishing, and inspection-ready results—because your second unit deserves first-class service.

FAQ: Drywall Repair for San Diego ADUs and Garage Conversions

Can you use reclaimed drywall in your San Diego ADU to save money?

Technically, yes—but it’s risky. Reclaimed drywall may be compromised from moisture, lack proper fire ratings, or be incompatible with San Diego’s ADU standards. Always inspect reclaimed materials thoroughly, and check with city building inspectors before using them. In most cases, new, code-approved materials are worth the peace of mind.

Is fire-resistant drywall required in garage conversions?

In many cases, yes. If your garage shares a wall with the main home or is close to the property line, Type X fire-resistant drywall is required by code. It provides enhanced fire resistance and is part of maintaining safety compliance in garage conversions. Always check with the city’s planning department or work with a licensed contractor who knows local requirements.

How do you insulate a detached garage before drywalling it?

Start by sealing all gaps and cracks in the framing. Use rigid foam board or fiberglass batts, depending on your wall construction. Add a vapor barrier if moisture is a concern (especially near the coast). Only after proper insulation should you install drywall—this ensures comfort and energy efficiency year-round.

Want more drywall insights and renovation tips tailored to San Diego living?

Check out the rest of our blog for advice on everything from patching nail pops to preserving vintage walls—and stay tuned for more ADU renovation tips!

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