Aziz Construction

Homeowner planning guide

Design-Build, Architect and Contractor: Who Does What?

Compare project delivery arrangements by responsibilities, documents and decisions rather than relying on a design-build label.

Aziz Construction · Published · Updated · 3 min read

The short answer

Choose a project arrangement by understanding who designs, who builds and who is responsible for the decisions between those activities. A label such as design-build does not establish which professionals are engaged, which documents are included or how changes will be managed.

For a substantial Peninsula or South Bay renovation, start with a responsibility map before comparing proposals. It should identify the actual people and agreements involved rather than assume that one company performs every professional service.

Separate the work from the contract structure

A project can involve architectural documents, engineering, interior selections, estimating, permit coordination and construction. Ask which activities your scope needs and who provides them. Then identify which agreements cover those activities and how they connect.

A coordinated process can involve separate professional engagements. Conversely, a proposal presented under one brand may still involve different professionals with defined roles. Read the engagement rather than inferring the arrangement from the sales presentation.

What should the architect or designer resolve?

Ask what documents will be delivered, what level of detail they will contain and which decisions remain with you. Clarify responsibility for reviewing the existing building, coordinating consultants, responding to authority comments and answering questions during construction.

Interior selections also need a defined handoff. A collection of product images is different from a coordinated specification with dimensions, finishes and installation requirements. Establish which information is needed before it can support an accurate construction proposal.

What should the contractor explain?

Ask how the proposed construction scope is developed from the available documents, which assumptions remain and how site questions will be raised. Identify responsibility for purchasing, trade coordination, protection, scheduling, applicable inspections and handover.

A contractor's estimate should be understandable alongside the documents it prices. If a detail is unresolved, ask whether the estimate includes an allowance, an assumption or an exclusion. Do not treat an early planning number as a complete price for an undefined scope.

Test the handoffs before choosing the arrangement

  • Who checks that drawings, selections and construction assumptions agree?
  • Who approves a substitution before related purchases are made?
  • Who communicates a field discovery to the relevant professional?
  • How are cost and timing implications presented to the homeowner?
  • Which person is accountable for closing each unresolved question?

Ask the candidates to describe the process for a change you are actually considering. A clear explanation is more useful than a general promise of seamless coordination.

Compare the whole undertaking

When evaluating alternatives, include the work outside the construction agreement: professional services, owner purchases, applicable fees and household logistics. A proposal with fewer included responsibilities is not directly comparable to one that includes them.

Review scope, exclusions and change procedures in writing. The CSLB home improvement contract resources provide a consumer reference; they do not replace reviewing your actual agreements and professional responsibilities.

How Aziz fits into the conversation

Aziz Construction provides design coordination within construction projects. Standalone design services are not offered. Discuss the construction scope and the professionals involved so the engagement reflects the arrangement you actually need.

Bring your goals, property location, available drawings and current professional engagements to a project discussion. The next useful step is to identify missing information and responsibilities before choosing a delivery label.

Sources and scope

CSLB resources checked October 31, 2026. This guide compares questions to ask; it does not claim that Aziz employs architects, supplies every design document or offers a universal contract arrangement.

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