How to Compare ADU Builders in Los Angeles

This website is independent and may introduce owners to providers when an active referral path is available. It does not employ the provider, guarantee availability or replace the owner’s own checks. A referral is not an endorsement of a proposal.

Step 1: define the same project

Ask each bidder to price the same dated drawings, finish schedule and site assumptions. If the design is not ready, use a structured preconstruction comparison and do not present early allowances as a fixed build price.

The brief should identify ADU type and approximate size, jurisdiction, site access, known utilities, demolition, foundation basis, building systems, finish level, appliances, external work and owner-supplied items.

Step 2: identify the contracting entity

Record the exact legal name that will sign the contract, the salesperson’s relationship to it and any designer or subcontractor entities. Search the CSLB licence-check service and compare the record with the proposal.

CSLB advises checking active status, identity, classifications, workers’ compensation information and other record details. Preserve a dated copy and recheck before contract because status can change.

Do not rely on a logo, marketplace profile or someone else’s licence number.

Step 3: request relevant project proof

Ask for recent ADU work similar in type, jurisdiction and site difficulty. A garage conversion is weak proof for a hillside detached build; a finished kitchen photo does not demonstrate foundations, drainage or permit coordination.

With permission, speak to references about scope changes, communication, cleanliness, schedule updates, inspection corrections and closeout. Confirm whether the pictured project was completed by the same legal entity and team being proposed.

Step 4: normalize the proposal

Create rows for:

• feasibility, survey and site verification;
• architecture, engineering and energy documents;
• permit administration and government charges;
• demolition, protection, access and hauling;
• grading, drainage and foundation;
• framing, envelope, doors and windows;
• building services, equipment and off-site utility work;
• cabinets, counters, tile, flooring and paint;
• fixtures, appliances and allowances;
• paths, fencing, landscape and restoration;
• inspections, testing, cleaning and closeout; and
• exclusions, contingency and owner work.

Mark each row fixed, allowance, excluded, unknown or owner-supplied. A blank row is not included merely because the proposal says “turnkey.”

CSLB’s consumer guidance tells owners to seek a minimum of three written proposals using matching drawings, specifications and work.

Step 5: compare the design and permit role

Design-build, architect-led and build-only providers allocate responsibility differently. Ask who signs or stamps documents where required, who communicates with agencies, how many correction rounds are included, and who pays if owner changes require redesign.

If a standard or prefab plan is proposed, confirm programme status and site-specific work. “Pre-approved” does not settle whether the design fits the address.

Step 6: compare schedule evidence

Request the current design and construction workload, proposed start trigger, expected owner decisions, utility assumptions and a project schedule. Distinguish elapsed time controlled by the provider from agency, utility or product dependencies.

References should confirm how the provider communicates delays, not merely whether a project finished eventually.

Step 7: read the contract, not the sales summary

CSLB’s home-improvement contract page describes required written contracts for projects over $500, scope and material details, payment schedules, permit responsibility and written change orders. Under its ordinary rule, an initial payment cannot exceed either $1,000 or one-tenth of the total; the lower figure controls. Check current guidance and obtain legal advice where needed.

Confirm insurance, indemnity, site protection, working hours, cleanup, dispute terms, warranty, termination, lien releases and closeout documents. Do not sign with blank spaces or unattached exhibits.

Step 8: score fit, certainty and communication

A simple scorecard can cover:

1. verified entity and credentials;
2. relevant completed work;
3. site and utility understanding;
4. scope completeness;
5. allowance and exclusion clarity;
6. realistic schedule and capacity;
7. contract and payment clarity; and
8. quality of questions, records and communication.

Price belongs in the scorecard after scope normalization. A provider who identifies a real site risk may appear more expensive because another bidder ignored it.

Transfer every proposal into the categories in the Los Angeles California ADU cost guide. This exposes whether a difference comes from a better price, a different finish, an allowance or omitted work.

Questions worth asking in the first meeting

• What facts must be confirmed before you will fix the price?
• Which work will be performed by your company and which by others?
• Who owns and can use the design documents?
• What utility work is assumed?
• Which five items most often become changes on similar jobs?
• How are allowances selected and reconciled?
• What project will the proposed supervisor manage at the same time?
• What do I receive at final closeout?

Good providers should ask the owner detailed questions too.