---
title: "Architectural Design vs Interior Design in LA | Vividly Built"
description: "Architectural design, interior architects and interior designers explained: what each does, California's title rules, and who you need for an LA remodel."
url: https://vividlybuilt.com/answers/architectural-design-vs-interior-design-los-angeles
type: answer
updated: 2026-10-19
---

# Architectural design, interior architects and interior designers: *who do you actually need?*

**Short answer.** **Architectural design** is the design of the building itself: structure, envelope, exterior, height, square footage and the permit drawings for them. In California only a **licensed architect** may use the title architect or offer architectural services, though state law lets non-architects prepare plans for **conventional wood-frame homes of up to two stories** (plus a basement), with an engineer for structural elements. **“Interior architect”** is not a separate license in California, and because the word architect is restricted, only licensed architects may use it; the work it usually describes — space planning, millwork, ceilings, lighting and openings within the building — is what experienced **interior designers** do. Rule of thumb: if the structure or the building’s footprint changes, you need an architect or engineer; if the experience inside changes, you need an interior designer. Most whole-home remodels need both, working from one plan. Vividly Built is an interior design and visualization studio, not an architecture firm: for architectural design we work with our licensed partner architecture firm, or with your own architect.

## What architectural design covers

Architectural design is the design of the building as a whole. It decides what the house is: how big, how tall, where it sits on the lot, how it is framed, how it meets the street and what the outside looks like. It is also where most permit questions live.

  - **Site and massing:** footprint, setbacks, height, floor area and how the building steps with the land.

  - **Structure and envelope:** walls that carry load, roof, foundations, windows and doors in the exterior wall, fire-rated assemblies.

  - **Exterior:** elevations, rooflines, materials and the street presence.

  - **Code and permits:** the drawings a building department reviews, coordinated with structural, civil and energy consultants.

In California, the [Architects Practice Act](https://www.cab.ca.gov/docs/publications/architects-practice-act.pdf) reserves the title *architect* and the practice of architecture for licensed architects. There is an important exemption: plans for a **conventional wood-frame single-family home of up to two stories plus a basement** may be prepared by someone who is not an architect, with an engineer for any structural elements the building official requires. Larger, non-conventional and most commercial buildings need a licensed architect or engineer.

## What “interior architect” means

“Interior architect” and “interior architecture” are common phrases, especially in design media, for interior work that goes beyond finishes and furniture: reworking a floor plan within the building, designing ceilings, openings, built-ins and staircases, and coordinating lighting and millwork with the structure around them.

California does not have a separate license for interior architects. Because the law restricts the word *architect* and terms confusingly similar to it, the title belongs to licensed architects; designers who are not licensed architects cannot call themselves interior architects or offer “architectural” services in California (the California Architects Board has cited firms over exactly this wording on websites and directory listings). In practice, the work the phrase describes is done every day by experienced **interior designers**, working with an architect or engineer whenever the structure changes.

California also has a voluntary **Certified Interior Designer** title, issued by the California Council for Interior Design Certification, and many designers hold the national NCIDQ certification. Neither allows a designer to stamp structural or architectural drawings.

## What interior design covers

  - **Space planning:** layouts within the building, furniture plans, circulation and storage.

  - **Interior detailing:** ceilings, built-ins, millwork, interior openings and stairs, kitchens and baths.

  - **Finishes and lighting:** stone, tile, wood, plaster, plumbing fixtures, lighting plans and controls.

  - **Furniture, fixtures and equipment (FF&E):** selection, samples, procurement and installation.

  - **Visualization:** renderings and walkthroughs so owners approve the finished rooms before construction.

## Side by side

  | Decision | Who leads | License needed in California |
|---|---|---|

  
    | Footprint, height, additions, new square footage | Architect (or exempt designer on qualifying wood-frame homes) | Architect for most buildings; engineer for structure |

    | Load-bearing walls, beams, foundations | Structural engineer, with the architect or designer | Licensed engineer where calculations are required |

    | Exterior elevations and materials | Architect | Architect for non-exempt buildings |

    | Layout within the existing shell | Interior designer | None for interior non-structural work |

    | Kitchens, baths, millwork, ceilings | Interior designer | None, unless structure or exterior walls change |

    | Finishes, lighting, furniture, procurement | Interior designer | None |

  

## Who you need, by project

  - **Refreshing finishes, lighting and furniture:** an interior designer.

  - **Reworking the layout inside the existing walls:** an interior designer, plus an engineer if any wall turns out to be load-bearing.

  - **Whole-home remodel with structural changes:** both. The designer plans the rooms; the architect or engineer resolves structure and permits.

  - **Additions, second stories and ADUs:** architectural design is central; most projects also benefit from an interior designer working in the same plan. See our [ADU guide](https://vividlybuilt.com/answers/adu-design-cost-los-angeles).

  - **New construction:** an architect for the building and an interior designer from the earliest plans, not after framing. See [custom home timeline](https://vividlybuilt.com/answers/luxury-custom-home-timeline-los-angeles).

  - **Hillside, coastal or historic properties:** an architect with local experience, because these overlays add design review. See [who issues your permit](https://vividlybuilt.com/permit-finder).

## How the two work together

Most budget problems on luxury projects happen in the handoff between the people designing the building and the people designing the interior: a beam lands where the kitchen island was meant to go, a window moves and the furniture plan no longer works. The fix is to design both in one shared model from the start.

That is how Vividly Built works. We are an interior design, space planning and 3D visualization studio, not an architecture firm. When a project needs architectural design or stamped drawings, that work is done by **our licensed partner architecture firm**, or by your own architect if you already have one. The architect holds the license, signs the drawings and is responsible for the architectural design; we design the interiors, plan the spaces, build the 3D model and the 360° walkthrough, and coordinate with the architect so the building and the rooms inside it are resolved together before construction. Read more in our [interior designer vs. architect](https://vividlybuilt.com/answers/interior-designer-vs-architect) and [architect-led vs. design-build](https://vividlybuilt.com/answers/architect-led-vs-design-build-luxury-los-angeles) guides.

## How to check a license

  - **Architects:** look the person up by name or license number with the [California Architects Board](https://www.cab.ca.gov/cons/archs/index.shtml). A firm that offers architectural design should be able to tell you which licensed architect is responsible for it.

  - **Engineers:** verify with the Board for Professional Engineers, Land Surveyors, and Geologists.

  - **Contractors:** verify with the [Contractors State License Board](https://www.cslb.ca.gov/consumers/hire_a_contractor/).

  - **Interior designers:** there is no mandatory license; ask about Certified Interior Designer or NCIDQ credentials, and look at completed work at your scale.

## Common follow-up questions

### What is an interior architect?

The phrase usually describes interior work that goes beyond finishes: floor plans within the building, ceilings, openings, built-ins and stairs. California has no separate interior architect license, and because the word architect is restricted by law, only licensed architects may use the title. The work itself is commonly done by experienced interior designers, with an architect or engineer whenever structure changes.

### What is the difference between architectural design and interior design?

Architectural design covers the building itself: footprint, structure, exterior, height and permit drawings. Interior design covers what happens inside it: layout within the walls, millwork, kitchens and baths, finishes, lighting and furniture. Whole-home remodels and new homes usually need both, working from one plan.

### Do I need an architect to remodel my house in Los Angeles?

Not always. Interior work that doesn't change structure or the exterior usually doesn't need one. California also lets non-architects prepare plans for conventional wood-frame homes of up to two stories plus a basement, with an engineer for structural elements. Additions, larger or non-conventional homes, and most commercial projects need a licensed architect or engineer.

### Can an interior designer remove a wall?

An interior designer can design the change. If the wall is load-bearing, the structural part needs calculations or drawings from a licensed engineer or architect, and the work needs a building permit.

### Can an interior designer call themselves an architect in California?

No. Only licensed architects may use the title architect or terms confusingly similar to it, including architectural designer, and only firms with a licensed architect in management control may describe their services as architectural.

### Does Vividly Built provide architectural design?

Not directly. Vividly Built is an interior design, space planning and 3D visualization studio, not an architecture firm. When a project needs architectural design or stamped drawings, that work is done by our licensed partner architecture firm or by your own architect, and we design the interiors and the 3D walkthrough in the same model.

## Sources

1. [Architects Practice Act (incl. B&P Code §§ 5536, 5537, 5538)](https://www.cab.ca.gov/docs/publications/architects-practice-act.pdf) — California Architects Board. Who may use the title architect, and the exemption for conventional wood-frame homes.
2. [Consumer's Guide to Hiring an Architect](https://www.cab.ca.gov/cons/archs/index.shtml) — California Architects Board. When a project needs an architect and how to verify a license.
3. [Most Common Violations](https://www.cab.ca.gov/docs/misc/most_common_violations_bulletin.pdf) — California Architects Board. Unlicensed use of the word architect in titles and advertising.
4. [Enforcement Actions](https://www.cab.ca.gov/enf/enf_actions/s.shtml) — California Architects Board. Citations for advertising architectural services without a license.
5. [CCIDC Sunset Background Paper (B&P Code §§ 5800–5812)](https://abp.assembly.ca.gov/sites/abp.assembly.ca.gov/files/CCIDC%20Background%20Paper.pdf) — California State Assembly, Committee on Business and Professions. California's voluntary Certified Interior Designer title.
6. [Interior Designers: Occupational Outlook Handbook](https://www.bls.gov/ooh/arts-and-design/interior-designers.htm) — U.S. Bureau of Labor Statistics. What interior designers do.

_This guide explains California title and licensing rules in plain language. It is not legal advice._