Field notes / Homeowner guide
How to choose a custom-home builder: criteria that can be checked
Choosing a builder for a new house is a comparison of scope, license, estimate content, team and communication — not of a single total. Use criteria you can verify in writing.
Written · Revised · KB Remodeling
Public resource by KB Remodeling · The link and this general checklist contain none of your private answers or notes.
Method and how to cite
Method: original KB Remodeling synthesis of the official sources listed, checked on the dates shown in the guide. It describes questions and records to gather; it is not legal, engineering or permit advice and does not decide any project.
KB Remodeling. How to choose a custom-home builder: criteria that can be checked. https://kb-remodeling.com/resources/choosing-a-custom-home-builder (written 2026-10-11)
Written:
In brief
Verify the license on CSLB, ask every builder to price the same drawings, and compare inclusions, team, schedule communication and change process line by line.
01
Start from the same scope
Give each builder the same drawings, specifications, site information and allowance list. Without a common basis, two estimates measure different houses.
Ask each builder to say what is included, excluded and assumed: site work, utilities, reports the builder expects you to provide, permit fees, temporary facilities and cleanup.
Ask yourself
- Did every bidder receive the same documents?
- Which assumptions differ between estimates?
02
Check the license yourself
The Contractors State License Board lets anyone look up a license by number or business name, including status and complaint disclosure. Do this before signing anything.
CSLB defines classifications in Business and Professions Code section 7055: A (general engineering), B (general building), B-2 (residential remodeling) and specialty C classes. Ask which classification the builder holds and confirm on CSLB that it fits a new house. A website or proposal is not a substitute for the CSLB record.
Ask yourself
- Does the CSLB record show an active license under the business name on the contract?
- Which classification is listed?
03
Compare the estimate and the team
A comparable estimate separates construction from allowances, lists who supplies what, and names the items it does not price. Ask who will run the job day to day, which trades are in-house or subcontracted, and who coordinates with your architect and engineers.
Ask how schedule updates are delivered — written look-aheads, meeting notes, a shared log — and how long-lead items are tracked.
Ask yourself
- Who is the day-to-day contact on site?
- How will schedule changes be communicated?
04
Ask for the change process before you sign
Changes happen on new homes. Ask for the written procedure: who can request a change, how it is priced, how schedule impact is shown, and that work waits for written approval.
CSLB publishes guidance on home improvement contracts. Contract law for new construction can differ from remodel rules, so have an attorney review the contract you are asked to sign; this guide is not legal advice.
Ask yourself
- Is the change procedure in the contract?
- Who reviews the contract for you?
05 · What to ask for
A license number is not a verified classification
Seeing a license number on a website, truck or proposal tells you only that an identifier was offered. Verification means reading the current CSLB record yourself and matching it to the contract you are asked to sign: the business name, the status, the classification, and who the record lists as the qualifying individual.
On the CSLB lookup you can search by license number (digits only, up to eight), by business name or by personnel name. If a business-name search fails, CSLB suggests typing only the first 10 to 15 letters, and putting the last name first for a name like "John Smith Construction". Note the date you checked; a record can change between proposal and signature.
Then ask the operating questions the record cannot answer: who supervises the site day to day, who is your single point of contact, how often you receive written updates, and which scope the proposal excludes. Write the answers next to each bidder so the comparison stays on evidence rather than impressions.
- Identifier offered
- A number on marketing material. Next action: look it up on CSLB before relying on it.
- Record read
- Status and classification read on CSLB on a date you noted. Next action: match the business name to the contract.
- Scope fit
- Whether the listed classification covers the work proposed. Next action: ask the builder and, if unsure, CSLB directly.
- Operations
- Supervision, contact and update cadence in writing. Next action: add them to the comparison sheet.
Ask yourself
- Does the CSLB record's business name match the name on the contract?
- Which classification does the record list, and was it read on a dated check?
- Who supervises the site and who is your written point of contact?
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Builder comparison sheet
| Criterion | What to ask for | How to verify |
|---|---|---|
| License | License number, classification | CSLB license lookup |
| Scope | Inclusions, exclusions, assumptions | Written estimate against the same drawings |
| Allowances | Each allowance and its basis | Line items, not a lump sum |
| Team | Site lead, trades, coordinator | Named roles in the proposal |
| Schedule communication | Update format and frequency | Sample report or log |
| Changes | Written change procedure | Contract clause |
A scenario to consider
Illustrative scenario, not a client project: two estimates differ widely until the owner notices one excludes utility connections and soils work. With those lines added, the comparison is about scope rather than price.
Planning scenario
Part of the custom-home planning series: Custom home planning
Bring this to your conversation
- Look up each license on CSLB
- Send every bidder the same document set
- Request inclusions, exclusions and allowances in writing
- Ask who runs the job day to day
- Ask for the written change procedure
- Have the contract reviewed by your attorney
One more question
Is the lowest custom-home bid the best value?
Only if it prices the same scope. Compare inclusions, exclusions and allowances first; a low total often omits site work, utilities or reports.
Official references
Check professionals · Web resource · English source
California Contractors State License Board — Check a contractor licenseUse this for: Check the current contractor record before hiring; a number alone does not establish scope or status.
Check professionals · Web resource · English source
California Contractors State License Board — Licensing classifications (B&P Code § 7055)Use this for: Compare the proposed work with CSLB licensing classifications.
Check professionals · Web resource · English source
California Contractors State License Board — Hire a contractorUse this for: Prepare contractor-selection questions and request project-specific documentation.
Check professionals · PDF · English source
California Board for Professional Engineers, Land Surveyors, and Geologists — A Guide for ConsumersUse this for: Identify the engineering, survey or geological professional to consult about the site.
For requirements specific to your property, consult the local reviewing authority.
About this guide
Published by KB Remodeling from the official sources cited. It is not attributed to an individual author and does not claim review by an architect, engineer or attorney. We receive remodel, ADU, new-home and rebuild inquiries; scope, licensing and location are reviewed before any next step.