How to Compare Custom Home Builder Proposals: Scope, Allowances and Exclusions

Two custom home proposals can describe the same house and still cover different work. One may include site preparation and finish installation; another may leave parts of both for later pricing. Comparing the totals before checking those differences can give you a misleading picture of the project.

For a Bay Area new home, a useful comparison starts with a shared set of plans, a clear list of selections, and a record of unanswered questions. Use the steps below to turn each proposal into a scope you can discuss with the builder.

1. Check the contractor’s CSLB license first

Before comparing prices, use the Contractors State License Board’s official license lookup to check each contractor by license number or business name. Confirm the business matches the proposal, review the current license status and classifications, and read the available complaint and disciplinary disclosures. A license number printed on a proposal is not a substitute for checking its current status.

CSLB also recommends comparing at least three written bids based on the same plans, specifications and scope. Ask for recent similar-project references, and verify workers’ compensation and general liability coverage with the contractor and insurance provider. See CSLB’s guide to finding the right licensed contractor for its full hiring checklist.

2. Check what each builder priced

Write the drawing date and revision number at the top of your comparison sheet. Add the specifications, finish schedule, engineering information, and site reports supplied to each bidder. If one builder received newer information, give the others the same material before comparing revised proposals.

Check the purpose of each number, too. An early budget based on a concept is different from a detailed construction proposal based on coordinated drawings. Ask each builder to identify which items are priced, estimated, provisional, or still awaiting a decision. More detail does not remove uncertainty, but it makes the uncertainty easier to locate.

3. Compare responsibilities alongside construction work

Create one row for each major part of the project: site preparation, foundation, structure, enclosure, building systems, interiors, and exterior improvements. Then add rows for design, engineering, investigations, permit coordination, and fees. Mark each proposal “included,” “excluded,” “allowance,” or “needs clarification.” Leave no blank cells that could be mistaken for an inclusion.

For example, “permit coordination included” does not tell you whether application fees are included. “Kitchen included” does not identify cabinetry, counters, appliances, installation, or connections. Ask for the deliverable and responsible party rather than relying on a broad category name.

Design-build and construction-only proposals may have different starting points. Establish where each builder's responsibility begins and which services you will arrange separately. Compare the full project picture before deciding which delivery approach suits you.

4. Open every allowance

An allowance is a placeholder for an item whose final selection or cost is not yet resolved. Ask how the builder uses the term in this proposal; do not assume all builders calculate allowances the same way.

For each allowance, record:

• The item, quantity, and selection assumptions.
• Whether it covers supply, installation, delivery, taxes, or other charges.
• What happens if the selected item costs more or less.
• Any associated builder fees and how they are calculated.
• The date the selection is needed and who confirms the final amount.

Consider a lighting allowance. A fixture budget alone may not describe dimmers, specialty controls, installation, or ceiling details. Ask where those related items appear. A larger allowance can make one proposal look more expensive while reflecting selections closer to your expectations. Bring actual product preferences into the discussion so the comparison rests on the home you intend to build.

5. Give exclusions an owner

An exclusion is not automatically a problem. It becomes a planning problem when nobody accounts for the excluded work.

For each exclusion, ask who will investigate it, obtain pricing, perform the work, and coordinate it with construction. Possible questions include demolition or deconstruction, utility connections, drainage, driveway work, landscape installation, and owner-purchased equipment. These are prompts to check against your project, not a list of items every builder excludes.

Keep unknown site conditions visible. If a proposal assumes a particular foundation approach or straightforward utility access, record what information supports that assumption and what further investigation could change it. Avoid adding an invented number merely to make the spreadsheet look complete. Use “unpriced—information needed” until there is a defensible basis.

6. Separate the base proposal from options and reserves

Keep optional upgrades in a separate column. An alternate window system or additional built-in cabinetry should not be silently included in one total and left out of another. Ask which option each proposal assumes and what related work changes with it.

Also distinguish allowances from a contingency or owner reserve. An allowance addresses a specified unresolved item. A reserve may be intended for broader uncertainty or future decisions. Ask who controls it, what it is intended to cover, and how its use is reported. Avoid counting the same item in both places.

The goal is a comparable scope, with remaining differences visible. A single adjusted total is useful only when the adjustments have clear support.

7. Ask how the proposal becomes a working plan

Request an explanation of how selections, questions, revised pricing, and approvals will be recorded. Ask how a proposed change will show its scope, cost, and schedule effect before you make a decision.

Review the schedule's assumptions alongside the price. Which milestones depend on finished drawings, agency review, material availability, or your selections? Who updates the plan when those assumptions change? A completion target is easier to assess when you can see the decisions and dependencies behind it.

At the comparison meeting, bring your marked-up scope sheet and ask each builder to resolve the open rows in writing. Keep the revised proposal and the clarification record together.

Questions homeowners ask

Should I choose the lowest proposal?

First establish whether the proposals cover comparable work. Then consider the builder's explanation of assumptions, project responsibilities, communication, and relevant experience alongside price. An unexplained gap deserves a question, not an automatic conclusion.

Can allowances change after I choose materials?

They can, depending on the selection and the proposal's terms. Ask how differences, related charges, and credits are documented before treating an allowance as a final cost.

What should I bring to a proposal review?

Bring the same current plans sent to bidders, your selection list, available site information, and a comparison sheet with open questions. Identify priorities you would consider changing if the scope needs adjustment.

Review CSLB’s contract guidance before signing

Read CSLB’s Hiring a Licensed Contractor guidance and contract and binding agreement guidance before moving ahead. Confirm the written agreement clearly identifies the work, materials, price, payment schedule, permit responsibilities and timing. Keep agreed changes in writing and retain a copy of the signed documents.

CSLB provides specific guidance for home improvement contracts. A ground-up new-home project may involve different contract requirements, so confirm which rules apply to your project rather than assuming every remodeling rule applies unchanged.

Review the scope for your property

Greenberg's custom home service coordinates architecture, engineering, permitting, and construction, with 3D review and selections in the Palo Alto showroom. Confirm the services, professional roles, and deliverables included in your particular proposal.

Contact Greenberg Construction with your property information and current plans to discuss the next steps in defining a project-specific scope.

This checklist is general planning information, not legal advice. Have questions about the meaning or legal effect of contract terms reviewed by a qualified professional.