Los Angeles ADU Design and Permits

The governing authority depends on the property. City of Los Angeles applications use City processes. Other incorporated cities and unincorporated Los Angeles County maintain their own guidance and portals. Establish jurisdiction before selecting a plan provider or permit strategy.

What happens before drawings?

Complete enough feasibility work to identify the legal parcel, existing development, proposed ADU type, available envelope, access, utilities and known overlays. Decide who obtains missing survey, structural, geotechnical, arborist, fire, historic or other specialist information.

The design brief should state room/size goals, intended use, privacy, accessibility priorities, finish level, budget and items the owner will supply.

What may the drawing package contain?

Project requirements vary, but a complete package commonly draws from:

• cover sheet, scope and code information;
• existing and proposed site plans;
• area and zoning calculations;
• floor and roof plans;
• exterior elevations and building sections;
• door/window and finish information;
• foundation and framing plans/details;
• structural calculations where required;
• mechanical, electrical and plumbing information;
• Title 24 energy forms and supporting documents;
• drainage, grading or civil information where required; and
• manufacturer or deferred-submittal documents.

LADBS Information Bulletin P/GI 2023-032 lists suggested minimum documents for a new ADU Standard Plan. It notes that individual projects may require fewer or additional documents.

Who owns and coordinates the design?

Ask for the legal name and role of the architect, engineer, designer, energy consultant, surveyor and permit representative. State whether the construction provider employs them, subcontracts them or expects the owner to contract separately.

The agreement should identify:

• number of concepts and revision rounds;
• who owns/reuses the drawings;
• site visits and measurements;
• consultant fees;
• agency submission and response responsibility;
• redesign triggered by budget or site information;
• construction-phase questions and revisions; and
• what happens if the construction contract is awarded elsewhere.

What does pre-approved mean?

LADBS says its Standard Plan Program pre-reviews designs for applicable building, residential and green codes. Site-specific zoning and foundation factors are reviewed for the property. West Hollywood’s current FAQ makes the same distinction: a pre-approved plan still needs site review and may not fit slopes, power-line conditions, setbacks or other requirements.

Pasadena shows why programme dates matter: the City ended general use of its earlier catalogue after 2025 when California’s new code cycle began. It currently describes a narrow Eaton Fire path while replacement options are considered. Check every standard-plan claim against the governing city’s live programme.

See standard plans versus custom ADUs.

Plan review is an exchange, not one date

A schedule should identify initial submission, completeness, agency review, correction issuance, consultant response, resubmission, other clearances, permit issuance and conditions before work begins.

Ask the provider to distinguish:

• statutory or agency review periods;
• its own response time;
• time waiting for owner decisions;
• utility or outside-agency work; and
• total calendar duration.

Do not convert a review target into a guaranteed permit date.

How are permit and consultant costs handled?

Separate fixed design fees, consultant estimates, agency fees, utility charges and reimbursable expenses. Mark which values are known, allowances or paid directly by the owner.

If a design-build company advertises one total, ask what happens when plan review requires structural, utility or site changes. The cost guide provides the categories.

What should be complete before construction pricing?

Pricing can begin earlier as a planning exercise, but a firm comparison needs a stable site plan, floor area, structural basis, finish schedule, utility assumptions and external-work scope. Every bidder should receive the same revision.

Require an addendum log when drawings change. A provider should confirm which dated set its price uses.

Permit responsibility belongs in writing

California CSLB guidance says a home-improvement contract should identify who obtains necessary permits. Also state who attends inspections, answers corrections, supplies deferred documents, pays reinspection charges caused by its work and obtains closeout records.

Use the builder comparison to record these responsibilities.

Control revisions after submission

Keep a drawing register with the sheet date, revision description and recipient. When an owner, agency or field condition changes the design, identify which architectural, structural, energy and building-system sheets are affected before work proceeds.

A proposal should state how ordinary correction responses are included and how owner changes are priced. It should also identify who checks that the construction team is using the current approved set. These controls belong in the complete ADU budget, because a low design fee can become expensive when coordination and revisions are excluded.

Require written distribution of each approved revision to the owner, site supervisor and affected trades.