Home Additions
Need that Extra Room
For most homeowners a day comes that their family outgrows their current interior space. The debate of moving or adding additional square footage to their existing home structure starts to be an evening diner discussion. Most homeowners think that a room addition involves too much red tape or simply is too expensive to built.
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Adding additional square footage to your home is more cost effective than buying a new home especially with the current rising home market prices, and bidding wars, which is the current landscape for much of Southern California housing market. CentrePoint's years of experience in home additions ensure that our streamlined process of building an addition will be as smooth as possible from consultation, blueprints, obtaining city permits, and construction. Centrepoint Construction is focused and committed to delivering the best customer service and workmanship for that kitchen extension, new home office space or master bedroom.
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The Complete Step-by-Step Process for Building a Home Addition:
Planning and design process
During our initial meeting the design-build team and client will meet to get a clear understanding of what the owner wants to achieve in the project’s scope and budget guidelines. The team will also conduct site evaluations and feasibility studies. A detailed plan for your home additions keeping within your budget. Your plans will include floor plan, elevations, engineering specification, Low Impact Development (LID) and Title 24. Once your plans are ready to issue and permits are pulled we will mobilize to start your project.
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Breaking ground on your project
Before we start digging for the new foundation for safe excavation, we will obtain all utility clearance from 811 DigAlert. Once we have an approval and marketing of all utilities, we are ready to clear the site and remove any obstruction that could affect the foundation's stability. The site may need to be graded or leveled to ensure proper drainage. The area for the foundation will be excavated, rebars will be placed, dowelling will be installed to connect existing to new foundation, are a few of the steps before pouring concrete. Finally, the foundation will be inspected by deputy inspector, engineer and city inspector to ensure that it meets all building codes and regulations. Once approved we proceed to pour concrete.
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Framing your home addition
We start with lay out the sill plate made out of treated wood, secured to the top of the foundation wall using bolts and hold-down rods that were already placed during foundation. This is essentially the base of the home's framework. Referring to the framing plans we start to build the house. Rim joists, floor joist and first-floor 2x4 or 2x6 walls with post are built using high grade lumber yard wood. Once we’re ready we install structural beam composite lumber like LVL, PSL, Glulam or steel I-beam just depends what the engineer calls for. It’s time to put the roof structure on with either pre-manufactured trusses or built-up rafters, depending on the design. Once we have the walls and roof up, we start with installing plywood sheathing for the roof and shear walling the walls. The shear walls are structural support element that resists racking shear forces, from heavy winds and seismic activity. Hardware installation like CMST12 straps, Simpson strong tie Hold-Down and other engineered specified hardware will be installed. will be inspected by deputy inspector, engineer and city inspector to ensure that framing meets all building codes and regulations. Once approved we proceed to drywall, exterior application and installing all finishes.
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Installing HVAC, plumbing and electrical systems
While foundation and framing are being constructed, in parallel to those stages in the construction, is the essential services to a building, which are mechanical (HVAC), Electrical, and Plumbing. All three systems are known as the (MEP). The MEP is planned during the design phase. The Engineers work with Architects to ensure that these systems integrate into the dwelling design. Once we breakground on the project all three trades work together with our team to provide a seamless process to make sure everything is installed according to approved plans. The city inspector will be called at different stages of MEP installing leading ensuring that all building codes and regulations are met.
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Rough Inspection: Framing & MEP
In Los Angeles, the rough inspection is a critical checkpoint in the construction process that occurs after the structural framing and initial mechanical, electrical, and plumbing (MEP) systems are installed—but before insulation and drywall.
At this stage, inspectors verify that:
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Framing is done per approved structural plans and meets local building codes.
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Mechanical systems (HVAC ducts, vents, and equipment rough-ins) are properly installed and accessible.
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Electrical wiring (outlet boxes, circuits, conduit, grounding, etc.) complies with code and plan layouts.
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Plumbing lines (supply, waste, and vent) are pressure-tested and installed to code.
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Nail plates or protective shields are in place where pipes or wires pass through framing.
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Fire blocking and draft stopping are properly installed as required.
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Passing the rough inspection is a major milestone—it means your project is on track and ready for the next phase: insulation, drywall, roof, exterior application and finishes.​
At CentrePoint, we handle all coordination with city inspectors, make sure everything is up to code, and keep you informed every step of the way. This is just one more way we deliver peace of mind on every project in Los Angeles.
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Roof Application Phase
With framing complete and inspections passed, your home addition moves into one of the most critical stages: roof installation. This phase protects the new structure from the elements and sets the tone for your addition’s exterior appearance
Here’s what happens during this phase:
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Roof Sheathing Installation We install structural panels (usually plywood or OSB) to form the roof deck over your new framing.
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Waterproof Underlayment A high-performance moisture barrier is applied to prevent leaks and protect against Los Angeles weather.
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Flashing & Waterproofing Details Flashing is added around chimneys, skylights, vents, and edges to ensure long-term water protection.
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Roofing Material Installation We install your selected roofing material—shingles, tile, metal, or flat roofing (TPO)—to match or complement your existing home.
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Ventilation & Final Touches Proper ventilation, drip edge, and finishing trims are added to ensure performance and durability.
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Window Installation
Before siding or drywall goes in, we install the windows to fully enclose and weatherproof the structure. Each window opening is carefully framed and leveled, then fitted with energy-efficient, Title 24–compliant units. We apply flashing tape, sealants, and waterproof membranes to prevent air and water intrusion. This step is key for long-term performance, comfort, and energy savings. Once installed, the windows are seamlessly integrated into both the exterior finish and interior wall system—preparing the space for the next stages of construction.
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Exterior Wall Applications
This stage involves installing your selected weather-resistant barrier, sheathing, and exterior finish materials—whether that’s stucco, siding, fiber cement, or another option. It not only defines the final look of your addition but also plays a critical role in insulation, energy efficiency, and long-term durability. ​ We offer a range of exterior wall applications to match your existing home design and meet local code requirements in Los Angeles. Here are the most common types of exterior wall finishes we apply in home additions:
Stucco (e.g., La Habra)
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A popular choice in Southern California
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Seamless, durable, and low maintenance
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Can be textured or smoothed to match your home’s finish
Fiber Cement Siding (e.g., Hardie Board)
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Fire-resistant and weather-durable
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Available in planks, panels, or shingles
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Can mimic wood, stucco, or stone finishes. Popular in HPOZ zone and coastal areas.
Wood Siding (e.g., LP siding)
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Offers natural warmth and charm
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Options include lap siding, board and batten, or shingles
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Requires regular maintenance or sealing
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Each material offers different benefits in terms of cost, maintenance, energy efficiency, and curb appeal. We'll help you choose the right exterior application to seamlessly blend your addition with your existing structure—or give it a bold new look.
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​​Drywall & Finish Application
Once insulation is complete and the structure is sealed, we move into drywall and finish work—the phase that truly transforms your addition into a livable space. Drywall panels are carefully installed, taped, and mudded to create smooth, seamless walls and ceilings. We then apply texture (if requested) and finish with primer and paint to match your home's interior style. Trim, baseboards, doors, and hardware are installed with attention to detail, bringing the space together with a clean, finished look. This stage marks the final step before your addition is move-in ready.
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Final Approval & Areas We Serve
After all construction is complete and the final inspection is passed, we obtain the Certificate of Occupancy (CofO)—the official sign-off from the city confirming that your addition is code-compliant, safe, and ready to use. This final milestone marks the completion of your project, and the start of a new, expanded way to enjoy your home.
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Whether you're expanding your living space, adding a second story, or converting your garage into an ADU, Centrepoint
Construction Inc. brings unmatched experience and craftsmanship to every home addition project.
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We proudly serve Southern California, including the cities below. Click on your city to learn more about our services in your area.
Los Angeles, Culver City, Santa Monica, Beverly Hills, Pasadena, Glendale, Burbank, West Hollywood, Torrance, Marina del Rey, El Segundo, Manhattan Beach, Hawthorne, Silver Lake, Eagle Rock, Woodland Hills, Canoga Park, Brentwood, Encino, Sherman Oaks, Studio City, North Hollywood, Chatsworth, Altadena, Highland Park, Northridge, Calabasas, Agoura Hills, Thousand Oaks
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