// Additions

More space, same address

Room additions, second stories, and home extensions in Orange County. Engineered to integrate seamlessly with your existing structure.

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// Our Approach

Expand without compromise

Adding onto an existing home is more complex than new construction — the new must integrate perfectly with the old. We start with a structural assessment of your existing home, then engineer the addition to tie in seamlessly. Matching rooflines, siding, and finishes so the addition looks like it was always there.

01

Structural assessment of existing home before design — identify load paths, foundation capacity, and framing connections

02

Roofline matching and exterior finish integration so the addition looks original, not bolted on

03

Phased construction minimizes disruption — you stay in your home through most of the project

04

Foundation engineering matched to existing conditions — pier, slab, or stem wall as appropriate

// What We Build

Our Additions Services

01

Second Story Addition

Double your living space without expanding your footprint. Structural reinforcement of existing walls and foundation to support the new level.

  • Structural shoring and temporary support
  • Foundation reinforcement engineering
  • Primary suite or multi-room configurations
  • Staircase design and placement optimization
02

Room Extension

Expand outward — add square footage to existing rooms or create entirely new spaces. Kitchen expansions, family rooms, and primary bedroom extensions.

  • Seamless wall removal and header installation
  • Foundation tie-in to existing slab
  • Matched exterior siding and trim
  • Extended HVAC and electrical systems
03

Bump-Out Addition

Smaller-scale expansion that adds 50–200 sqft to a specific room. Perfect for expanding a kitchen, adding a breakfast nook, or creating a home office.

  • Cantilevered or pier-supported designs
  • Minimal foundation requirements
  • Fast 6–10 week build timeline
  • Cost-effective per-sqft option
04

Sunroom & Enclosed Patio

Convert outdoor space to conditioned living area. Glass walls, skylights, and climate control create a room that brings the outdoors in year-round.

  • Floor-to-ceiling glazing options
  • Climate-controlled with mini-split HVAC
  • Indoor-outdoor transition design
  • Natural light optimization
// The Process

How We Build

01

Structural Assessment

We evaluate your existing home's structural capacity — foundation type, framing system, roof structure, and load paths. This determines what's possible.

02

Design & Engineering

Architectural plans that integrate with your existing home. Structural engineering for tie-in connections, new foundation, and any required reinforcement.

03

Permitting

Full plan submission including structural calculations showing integration with existing structure. We manage corrections and city approvals.

04

Structural Prep

Foundation work, shoring of existing structure if needed, and preparation of connection points. The critical phase that ensures structural integrity.

05

Build & Integrate

Framing, roofline integration, MEP extensions, and finish work. The addition is built to match your existing home in every detail.

06

Final Walkthrough

Inspection, punch list, and handover. The addition should look and feel like it was always part of the original home.

// Why Avorino

Addition specialists, not generalists

Additions require a builder who understands existing structures. We've engineered second stories onto 1960s slab-on-grade homes, extended kitchens through load-bearing walls, and added rooms to homes on hillsides. The structural complexity is what we do best.

$300–500
Per sqft
4–10 months
Build timeline
0
Structural failures

Ready to expand your home?