How is a custom home different from a whole-home remodel?

A custom home creates a new primary structure and coordinates a complete new envelope and systems package. A whole-home remodel begins with the legal existing building and decides what can responsibly remain. Permit history and existing conditions therefore matter much more to the alteration path.

Does custom mean every item must be one-off?

No. The home can be designed for the property while using preconfigured assemblies, standard product sizes or semi-custom cabinetry. Those choices can simplify decisions; they do not make the house exempt from parcel-specific design, engineering or review.

What must be known before construction scope is set?

At minimum: the property and jurisdiction, existing records, survey needs, site access, utility assumptions, program, consultant responsibilities and a coordinated design basis. Unknown subsurface or concealed conditions must remain identified as unknown.

Ground-up residential · Los Angeles

Custom homes shaped by the lot and the way you plan to live.

A ground-up home starts with a new building envelope, a coordinated consultant team and a complete permit path. RSA organizes those decisions before construction scope is fixed.

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Concept imagery · Not represented as completed RSA work

Project fit

When a custom home is the right project

A sound starting point when

The existing house cannot support the program, layout, accessibility or performance goals without work approaching replacement.
The owner wants the room relationships, structure, envelope and building systems developed together for this lot.
The property can be studied before a footprint, finish schedule or construction commitment is locked.

Compare another path when

If most of the structure and useful room layout can remain, compare a whole-home alteration before choosing demolition.
If the goal is one new room or a focused expansion, an addition may preserve more of the existing house.
A preconfigured or semi-custom plan can narrow early design choices, but it still must be checked against this parcel, agency and site conditions.

Scope decisions and deliverables

Property and approval study

Confirm the reviewing jurisdiction, zoning envelope, available records, access, utilities and site conditions before a concept is treated as buildable.

Deliverable

Property brief with confirmed conditions, unresolved items and required consultants.

Custom or preconfigured starting point

Choose whether the plan begins from a blank brief, an adapted prior plan or a manufacturer/system package. A repeatable starting point can reduce choices, but does not replace local review or site engineering.

Deliverable

Written design brief identifying fixed requirements, flexible choices and excluded assumptions.

Concept and consultant coordination

Develop massing, plans and exterior direction while structural, civil, geotechnical, energy and building-system inputs are identified for the property.

Deliverable

Coordinated concept package and consultant responsibility matrix.

Permit and construction package

Resolve the drawing set, specifications, selections and agency corrections before defining construction responsibilities.

Deliverable

Permit record, coordinated construction documents and written scope basis.

Deliverables table

Property and jurisdiction brief

Decision it supports: Whether the lot, legal context and review path support the intended program.
What remains open: Concealed, subsurface and agency-confirmation items remain identified until investigated.

Owner program and option record

Decision it supports: Which room relationships, performance goals and site priorities are fixed before design advances.
What remains open: Products and finish selections not yet approved stay outside the fixed basis.

Coordinated concept package

Decision it supports: Which massing, plan and consultant direction should move into permit documents.
What remains open: Engineering details remain subject to the responsible consultants and field information.

Written construction-scope basis

Decision it supports: Which drawings, specifications, responsibilities and selections a proposal can rely on.
What remains open: Allowances, exclusions and owner-supplied items remain visible rather than folded into an assumed total.

Deliverables table
What you receive	Decision it supports	What remains open
Property and jurisdiction brief	Whether the lot, legal context and review path support the intended program.	Concealed, subsurface and agency-confirmation items remain identified until investigated.
Owner program and option record	Which room relationships, performance goals and site priorities are fixed before design advances.	Products and finish selections not yet approved stay outside the fixed basis.
Coordinated concept package	Which massing, plan and consultant direction should move into permit documents.	Engineering details remain subject to the responsible consultants and field information.
Written construction-scope basis	Which drawings, specifications, responsibilities and selections a proposal can rely on.	Allowances, exclusions and owner-supplied items remain visible rather than folded into an assumed total.

What changes the scope

The survey, title record or jurisdiction review changes the buildable envelope.

Scope effect: Massing, access, retaining, drainage or entitlement work may need to change.
How it is resolved: Revise the property brief and concept before carrying the affected work into a construction proposal.

Geotechnical, civil, fire-access or utility review adds a consultant or off-site requirement.

Scope effect: The design team, documents and agency sequence expand.
How it is resolved: Assign the new responsibility and keep its unpriced work explicit until the consultant defines it.

The owner changes program, performance targets or finish basis after coordination begins.

Scope effect: Plans, engineering, energy work, selections and procurement may need revision.
How it is resolved: Record the change against the approved brief before updating scope or commercial terms.

Demolition or investigation reveals a condition not reasonably visible in records or surveys.

Scope effect: Protection, removal, remediation or redesign may be required.
How it is resolved: Document the condition, define the responsible specialist and price only the supported corrective scope.

Proposal readiness

A useful proposal separates defined work from unresolved risk.

Can be defined now

The approved program and concept basis.
Named consultant and permit responsibilities.
Drawings, specifications and selections included in the scope.
Owner-supplied work, alternates and exclusions.

Must remain explicit

Unknown subsurface or concealed conditions.
Agency comments not yet issued.
Products or finishes still awaiting selection.
Utility or third-party work not yet confirmed.

Decision Room

Turn this project path into a working brief.

Use the same scope logic from this page to compare assumptions, record unresolved conditions and prepare better questions.

Compare paths

If most of the structure and useful room layout can remain, compare a whole-home alteration before choosing demolition.

Identify cost drivers

Survey, title and available permit records.

Prepare the permit path

Property address and assessor parcel number.

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Site and design dependencies

Survey, title and available permit records.
Soils, slope, drainage and foundation recommendations where the site requires them.
Utility capacity, service locations and agency coordination.
Planning, design-review, fire, coastal, historic or other parcel-specific review.
Owner decisions on program, envelope, systems and finish level before procurement.

What to prepare

1Property address and assessor parcel number.
2Survey, title report, geotechnical work or prior drawings already available.
3A room-by-room brief: who uses each space, storage, accessibility and indoor-outdoor priorities.
4Examples of materials or spaces you value, separated into essential and optional choices.
5A clear statement of whether an existing house is expected to remain, be altered or be replaced.

Questions that shape the decision

How is a custom home different from a whole-home remodel?: A custom home creates a new primary structure and coordinates a complete new envelope and systems package. A whole-home remodel begins with the legal existing building and decides what can responsibly remain. Permit history and existing conditions therefore matter much more to the alteration path.
Does custom mean every item must be one-off?: No. The home can be designed for the property while using preconfigured assemblies, standard product sizes or semi-custom cabinetry. Those choices can simplify decisions; they do not make the house exempt from parcel-specific design, engineering or review.
What must be known before construction scope is set?: At minimum: the property and jurisdiction, existing records, survey needs, site access, utility assumptions, program, consultant responsibilities and a coordinated design basis. Unknown subsurface or concealed conditions must remain identified as unknown.

Primary sources

California Building Standards Commission
Current California building-code publications and effective dates.
California Energy Commission — 2025 Building Energy Efficiency Standards
Energy requirements for newly constructed buildings, additions and alterations under the 2025 standards.
Los Angeles City Planning — application forms
Official forms for City Planning entitlements and administrative clearances. Building permits are a separate review, and another city or LA County may be the responsible agency.
City of Beverly Hills — Permit Center Plan Review & Permitting Guide
City guide identifying pre-application consultation for larger projects and the documents used to start plan review. It applies only when Beverly Hills is the responsible jurisdiction.
City of Beverly Hills — residential submittal requirements
City checklist for residential drawings, surveys and project-specific items. It states that projects vary and may require additional information.

Useful next steps

RSA location

Based in Beverly Hills, serving Greater Los Angeles.

8484 Wilshire Blvd, Beverly Hills, CA 90211

(818) 724-8623

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Your next step

Start with the property and the decision you need to make.

Discuss a custom home