Interior Renovation Permit Drawings Santa Monica, CA
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Residential Interior Renovation & Permit Drawings — Santa Monica, California

Complete permit-ready residential renovation drawings including demolition plans, proposed layouts, roof modifications, MEP coordination, and structural detailing.

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Parameters Matrix

Project Snapshot

DetailInformation
Street18th Street
CitySanta Monica
StateCalifornia
CountyLos Angeles County
Project TypeResidential Interior Renovation + Addition
Existing Square Footage2,246 SF
Proposed Square Footage2,716 SF
Altered Area470 SF
Year Built1927
Scope SummaryInterior wall demolition and reconfiguration, kitchen and bathroom remodel, bedroom modifications, walk-in closet and office additions, roof framing changes, skylight integration, and exterior wall extension
Case Narrative

Project Overview

This Santa Monica renovation project centered on a single-story 1927 residence — a home with real architectural history, but a layout that no longer matched how the homeowners wanted to live. Built in 1927, the existing home offered 2,246 square feet across a single story, with four bedrooms and a layout typical of homes from that era: smaller, compartmentalized rooms with limited connectivity between living spaces.
The driving goal was to modernize the interior layout, improve functionality, and add usable square footage, all while keeping the home's single-story scale and overall street presence intact. Rather than a ground-up rebuild, the project focused on a smarter floor plan: reconfiguring three bedrooms into a layout, adding a walk-in closet, and carving out a dedicated office space — all reflecting a shift toward how modern households actually use a home.
Interior wall demolition cleared the way for new partitions aligned with the proposed layout, supported by full coordination with mechanical, electrical, and plumbing systems throughout the renovated areas. To accommodate the updated program, the project extended the building's exterior walls on the south and east sides, growing the home from 2,246 SF to 2,716 SF — a 470 SF addition integrated into the existing structure.
Roof framing was modified to support the new layout and accommodate skylight integration, requiring coordination between the existing roof structure and new framing elements. New skylights were incorporated into the design to bring additional natural light into the reconfigured interior spaces, a detail that required careful roof framing and waterproofing coordination. Throughout the renovation, the goal was modernization without erasing the home's 1927 character — updating systems, layout, and finishes while respecting the original structure's scale and street-facing presence.
Deliverables Register

What We Delivered

  • SITE-01 Existing Site Plan — documentation of the property and existing structure footprint
  • DEMO-01 Demolition Floor Plan — interior walls and elements marked for removal
  • FLR-01 Proposed Floor Plan — new room layout including kitchen, bathrooms, bedrooms, closet, and office space
  • RF-01 Roof Plan — proposed roof framing layout reflecting structural modifications
  • ELV-01 Existing and Proposed Elevations — side-by-side documentation of exterior changes
  • SEC-01 Sectional Views — building sections showing the relationship between new and existing construction
  • DET-01 Construction Details — detailing for wall extensions, roof tie-ins, and skylight integration
  • SCH-01 Door & Window Schedule — complete schedule for all new and replaced openings
  • E-01 Electrical Plan — updated electrical layout coordinated with the new floor plan
  • P-01 Plumbing Plan — fixture and supply line coordination for kitchen and bathroom renovations
  • SEW-01 Sewer Plan — documentation of sewer connections supporting the renovation
  • M-01 Mechanical Plan — HVAC and ductwork coordination for the altered areas
  • CODE-01 Code Compliance Sheets — Title 24 energy compliance and CALGreen documentation
Proposed Architectural Interior Plan Modernization Design Santa Monica California Property image
Spatial Resolution

Design & Structural Challenges

Working Within a 1927 Structure

Renovating a structure built nearly a century ago means working with original construction methods and materials that don't always align with current building practices, requiring careful field verification throughout design.

Structural Wall Modifications

Reconfiguring interior partitions required confirming which existing walls were load-bearing before demolition could proceed, ensuring the new layout didn't compromise the home's structural integrity.

Roof Tie-In Detailing

Extending the building's footprint on the south and east sides meant designing new roof framing that ties cleanly into the existing roof structure without creating water intrusion points or structural weak spots.

Moisture & Weatherproofing Upgrades

Older homes often lack modern weatherproofing details. The renovation incorporated updated moisture protection at all new exterior wall extensions and roof connections.

Skylight Waterproof Detailing

Integrating new skylights into the roof required precise waterproofing detailing to prevent leaks at the roof penetration points, a common challenge in older roof structures.

Existing-to-New Transitions

Blending new construction materials with the original 1927 building fabric required thoughtful detailing at every transition point, from wall extensions to roofline changes.

Space Planning Limitations

Working within a 0.20-acre lot and a single-story footprint meant every square foot of the addition needed to be planned carefully to deliver the most functional layout possible.

Structural Parameters

Code Compliance Section

California Building Code

Developed in strict accordance with the core design rules defined inside the 2022 California Building Code (CBC).

California Residential Code

Spatial layouts and framing safety provisions comply cleanly with the 2022 California Residential Code (CRC).

California Plumbing Code

Kitchen and bathroom plumbing fixture branches adhere completely to the 2022 California Plumbing Code (CPC).

California Mechanical Code

HVAC modifications, venting, and systemic duct configurations follow the 2022 California Mechanical Code (CMC).

Title 24 Energy Compliance

Envelope details and insulation balances are fully optimized for California Climate Zone 6 regional metrics.

CALGreen Standards

Material choices, waste reduction paths, and environmental criteria address the active CALGreen building mandates.

Zoning & Special Inspections

Complies with Santa Monica Single-Unit Residential (R1) zoning rules. Special inspections identified per CBC §1704 for reinforced concrete and soil compaction.

Los Angeles County Focus

Regional Expertise & Remodel Permit Insights

Unified Studio Architect is a trusted residential architect Santa Monica homeowners rely on for renovations that balance modern function with historic character. We prepare interior renovation drawings Los Angeles County building departments require for full permit approval.

As a source for home remodel permit drawings California homeowners search for, our team brings deep experience working with older residential structures, additions, and complex interior reconfigurations. If you're looking for a permit architect near me, our work spans Santa Monica and the surrounding West LA region.

Our residential renovation projects also extend to nearby communities, including: Venice, Pacific Palisades, Beverly Hills, West LA, and Brentwood. Whether your home is in Santa Monica or elsewhere across Los Angeles County, our renovation drawings are built to meet both local permitting standards and the realities of working with existing structures.

Information Center

Frequently Asked Questions

Yes. Interior renovations involving wall demolition, new partitions, or MEP system changes require permit drawings reviewed and approved by the City of Santa Monica before construction begins.
A typical residential remodeling permit set includes a site plan, demolition and proposed floor plans, elevations, sectional views, construction details, and electrical, plumbing, and mechanical plans coordinated with the new layout.
Yes, in many cases. Extending exterior walls requires permit drawings showing the new wall locations, structural support, and how the addition ties into the existing building, along with confirmation that the project complies with local zoning and lot coverage requirements.
Yes. Changes to roof framing, including modifications to accommodate skylights or wall extensions, require structural drawings showing how new framing elements connect to the existing roof structure."
Cost depends on project scope, square footage, and complexity. A renovation involving both interior reconfiguration and an exterior addition typically requires more detailed documentation than a cosmetic-only remodel.
Timelines vary based on project scope and current city plan check workload. A complete, well-documented drawing set generally helps avoid unnecessary review delays.
In many cases, yes — provided the modification is supported by structural drawings showing how loads are redirected to new beams, headers, or columns.
Yes. Renovations involving altered building envelope components, such as walls, windows, or ductwork, typically require Title 24 energy compliance documentation as part of the permit package.
As-built drawings document the existing condition of a structure as it currently exists, while proposed drawings show the new design intent. Both are typically required for renovation permit submissions.
Depending on the scope and local requirements, additional site documentation or surveys may be needed to confirm lot coverage and setback compliance for the proposed addition.
Skylight installations typically require structural and waterproofing details showing how the roof framing and membrane are modified to accommodate the new opening.
Yes. We support residential renovation and addition projects throughout Los Angeles County and nearby communities, including Venice, Pacific Palisades, Beverly Hills, West LA, and Brentwood.
Professional Standards

Why Choose Unified Studio Architect

Residential Remodeling Specialists

Proven experience executing deep interior reconfigurations, geometric structural wall shifts, and physical wall extensions on historic character homes.

Permit-Ready Documentation

Complete structural, architectural, and systemic drawing sets designed carefully to sail through strict municipal plan check loops.

Fast, Reliable Turnaround

Highly optimized drafting workflows designed to finalize complex residential drawing packages without compromising detail or structural compliance.

Code-Compliant Plans

All structural plan components are built precisely inline with active CBC, CRC, CPC, CMC, and local zoning requirements.

California Renovation Expertise

In-depth familiarization with rigorous California-specific guidelines, including Title 24 energy reporting systems and local CALGreen mandates.

Existing Structure Experts

A specialized structural approach that respects older residential fabrics while strategically updates interior connectivity metrics.

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