Exterior Wall Modification and Finishing


Transform your property with professional exterior wall modification and finishing services from Modern ADU Builder & Garage Conversions. As Long Beach's trusted specialists, we deliver exceptional results that elevate both aesthetics and structural integrity for your ADU or garage conversion project.


Our comprehensive exterior wall modification and finishing approach begins with a thorough assessment of your existing structure. Whether you're converting a garage into a functional living space or building a new ADU, our experts understand that exterior walls require specialized knowledge to ensure proper insulation, weatherproofing, and visual appeal.


From structural reinforcement to artistic finishes, we handle every aspect of exterior wall modification and finishing with precision and care. Our team is well-versed in Long Beach building codes and permit requirements, guiding you seamlessly through the approval process while ensuring all modifications meet local standards.


We pride ourselves on using premium materials that withstand Southern California's unique climate conditions while providing energy efficiency benefits. Choose from a variety of finishing options including classic stucco, modern fiber cement siding, or custom solutions to complement your home's architecture.


By entrusting your exterior wall modification and finishing project to Modern ADU Builder & Garage Conversions, you're investing in enhanced property value, improved energy efficiency, and lasting curb appeal. 

Our Wall Modification Services

We provide precise methods to alter and enhance your exterior walls, ensuring safety, functionality, and aesthetic value. Our work involves structural changes, expansions, creating new openings, and upgrades to meet seismic standards.

Structural Wall Adjustments

We specialize in modifying load-bearing and non-load-bearing walls to suit your project needs. This includes reinforcing existing framing, repositioning walls, or removing parts while maintaining structural integrity. Every adjustment is carefully planned to comply with building codes and safety regulations.



Our team conducts thorough assessments before making changes. This ensures stability throughout construction and after completion, minimizing risks related to shifting or weakening structures.

Exterior Wall Expansions

Expanding exterior walls allows for increased interior space or enhanced exterior design. We handle additions ranging from small bump-outs to full-scale extensions. This includes extending foundation support, framing, and finishing to match existing materials and styles.


We focus on seamless integration, ensuring that expansions do not disrupt the overall building envelope or external aesthetic. Proper insulation, weatherproofing, and trim work are standard parts of our process.

Openings for Doors and Windows

Creating precise openings for doors or windows requires careful cutting, framing, and finishing. Our team ensures that new openings maintain wall strength and comply with relevant codes.


We install headers, supports, and flashing to prevent structural issues and water intrusion. The goal is to provide proper ventilation, light, and access without compromising exterior durability.

Seismic Upgrades 

In Long Beach, seismic safety is crucial. We apply seismic retrofitting techniques to exterior walls, improving their resistance to earthquake forces. This includes adding shear panels, anchor bolts, and reinforcing weak points.


Our seismic upgrades are designed to protect both the structure and occupants. We follow local regulations and best practices, ensuring the building meets or exceeds required standards.

Expert Wall Finishing Solutions

We provide wall finishing options tailored to Long Beach’s climate and architectural styles. Each method is chosen to enhance durability, appearance, and protection against the elements.

Stucco Application and Repairs

We specialize in applying high-quality stucco that adheres well to exterior walls, creating a strong and weather-resistant finish. Our process includes assessing current wall conditions, ensuring proper surface preparation, and applying multiple stucco layers for optimal adhesion.



For repairs, we identify cracks, chips, and water damage, then carefully remove damaged sections before matching new stucco to the existing texture and color. Our approach restores structural integrity while maintaining a seamless appearance.

Siding Installations

We install and replace various siding materials, including vinyl, fiber cement, wood, and composite options. Our team evaluates your home’s insulation needs, moisture control, and style preferences to recommend the best fit.



During installation, we ensure tight seals around edges and windows to prevent drafts and water intrusion. For replacements, we remove old siding with minimal disruption and inspect underlying structures for rot or damage.

Weatherproof Coatings

Applying weatherproof coatings is essential to extend wall longevity and resist deterioration from sun, rain, and salt air. We use specialized elastomeric paints and waterproof sealants designed for Long Beach’s climate conditions.



These coatings fill minor cracks, create a flexible protective layer, and reduce moisture penetration. They also prevent mold growth and peeling, which can compromise structural stability.

Textured and Smooth Finishes

We offer both textured and smooth finishes to suit aesthetic preferences and functional needs. Textured finishes add depth and hide minor wall imperfections, often created using trowels, brushes, or spray techniques.


Smooth finishes provide a clean, modern look and require precise application to avoid visible lines or flaws. We carefully prepare surfaces by sanding and priming to ensure proper adhesion for any finish type.

Why Partner with Us

Our team handles every exterior wall modification with precision, using premium materials tailored to local climate conditions. We prioritize personalized approaches that complement the unique architecture of Long Beach homes while maintaining durability and aesthetic appeal.

Experienced Specialists

We have over a decade of experience specializing in exterior wall modifications and finishes. Our crew understands the technical requirements and local building codes specific to Long Beach, ensuring compliance and quality workmanship. Each project begins with a thorough assessment.

High-Quality Materials 

We select materials based on durability, appearance, and compatibility with existing structures. Our preferred products include fiber cement siding, stucco with integrated waterproof barriers, and weather-resistant paints suited for the coastal environment. Our skilled tradespeople apply these materials with exacting standards to achieve smooth, even finishes and tight seals. 

Customized Solutions

No two homes are alike, especially in a diverse area like Long Beach. We tailor exterior wall modifications to fit architectural styles including Craftsman, Mediterranean, and Modern. We work closely with homeowners to match colors, textures, and structural additions that blend seamlessly with the neighborhood.

FAQs on Exterior Wall Modification and Finishing

We specialize in a range of exterior wall modification and finishing services tailored to meet different property needs. Our expertise covers structural changes, surface refinishing, and upgrades that improve both function and appearance.

  • What permits are required for exterior wall modifications in Long Beach?

    In Long Beach, you'll need a building permit for exterior wall modifications, which falls under the city's Development Services Department. For substantial changes, you may also need plan approval from the Planning Bureau to ensure compliance with zoning regulations. Modifications affecting load-bearing walls typically require structural engineering approval.

  • How much does exterior wall finishing cost for an ADU in Long Beach?

    Exterior wall finishing for an ADU in Long Beach typically costs between $15-45 per square foot, depending on the materials chosen. Basic stucco finishes start around $15-20 per square foot, while more premium options like stone veneer can range from $35-45 per square foot. Most ADU owners spend about $8,000-15,000 total on exterior finishing.


  • Can I change the exterior of my garage conversion in Long Beach?

    Yes, you can change the exterior of your garage conversion in Long Beach, provided you obtain the necessary permits and follow local building codes. The modifications must comply with zoning requirements and neighborhood aesthetic standards. Many homeowners update garage exteriors during conversion to better match the main residence or create a more modern appearance.

  • How long does exterior wall modification take for ADUs?

    Exterior wall modifications for ADUs typically take 2-4 weeks to complete, depending on the project scope. This timeframe includes demolition (if needed), framing modifications, utility work, insulation installation, weatherproofing, and finishing. Complex projects or those requiring extensive structural changes may take longer.


  • What are the best exterior wall materials for ADUs in Southern California?

    The best exterior wall materials for ADUs in Southern California include:


    1. Stucco - Excellent durability, fire resistance, and traditional appeal
    2. Fiber cement siding - Low maintenance with good moisture and termite resistance
    3. Engineered wood siding - More sustainable than traditional wood with similar aesthetics
    4. Metal panels - Modern appearance with excellent durability in coastal environments
    5. Composite materials - Low maintenance options that can mimic natural materials

    Climate considerations favor materials with good insulation properties and resistance to sun exposure and coastal moisture.