Design-Build or Architect Plus Contractor? Choosing for a Whole-House Remodel or Addition

Before you choose a company for a whole-house remodel or an addition, you choose a way of working. Either one firm designs and builds the project, or you hire a designer first and a builder after. Both routes produce permitted, well-built homes. They differ in who carries the cost risk while the design is drawn, how many contracts you manage and who you call when something does not fit. This page compares the delivery models, not companies.

The three common routes

How design-build works

A design-build firm has designers and builders in one company. You meet, agree on goals and a budget range, and the design is drawn with the people who will price and build it in the room. When a design choice would push the cost past the budget, you hear about it while it is still a line on paper, not after the plans are finished.

At JDI, the first step is a consultation in your home. If you go ahead, you sign a design agreement and our design team works with you on layout plans and finish selections, then the design is finalized against the budget before construction is scheduled and permits are pulled. A dedicated project manager runs the job once construction starts. Our process page and design-build page describe it step by step.

The main trade-off: you are not collecting competing bids on one fixed set of plans. You are choosing a team, and you judge the price by the itemized estimate, the scope and your own comparisons. Our page on comparing estimates line by line helps with that.

How the architect route works

You hire an architect, or a residential designer, to design the project and produce the drawings. Many architects then help you put the plans out to bid, compare the bids and watch construction for you. You sign a separate contract with the builder you choose.

The strength of this route is independence. The designer works only for you, and several builders price exactly the same plans. The risk is that the price arrives late: if every bid comes in over budget, you pay for redesign and wait again. And when something on site does not match the drawings, the architect and the builder may each say it is the other's problem.

Additions add engineering and permit drawings

A whole-house remodel that moves walls, and every addition, needs more than a floor plan. The City of Vancouver's residential addition checklist asks for a site plan, floor plans, a foundation plan and details, floor and roof framing plans, wall and bracing sections, and exterior elevations of all sides. Its structural items include an engineered lateral analysis for wind and seismic loads (or a prescriptive path) and beam calculations for all beams spanning 10 feet or more, plus beams that support or create a point load. Additions over 200 square feet need radon mitigation details, and energy code forms are part of the submittal.

Any of the three routes can produce that package; what matters is who coordinates the engineer and answers the city's review comments. In design-build, that is the firm. With an architect, it is usually the architect. If you coordinate yourself, it is you.

When the architect route is the better choice

We build with our own design team, and it is still not the right fit for every project. An architect-led route is often better when:

• The structural work is complex. Steep or unstable lots, large spans, major foundation work or a design that pushes what the house can carry deserve a design professional who leads the engineering from day one.
• The house needs historic or design review. Homes in historic districts or on a heritage register can face review of exterior changes, and an architect experienced with that process is worth having.
• You want several builders to bid one plan set. If competitive bidding on identical plans is how you want to set the price, start with an independent designer.
• The design itself is the project. If you want a signature architectural design, hire the architect whose work you love and choose a builder after.

When design-build usually fits better

• You want one accountable team and one point of contact from design through the final walkthrough.
• Your budget is firm, and you want cost checked while the design is drawn.
• The project is a remodel of an existing house, where what is behind the walls affects both the design and the price.
• You would rather not referee between a designer and a builder.

Questions to ask whichever route you choose

• Who produces the permit drawings, and who answers the city's review comments?
• Who hires and coordinates the structural engineer?
• When will I see a construction price, and how firm is it?
• If I stop after design, what do I own and what do I owe?
• Who is my contact once construction starts?

Next step

Whichever route you lean toward, the company you hire matters most. Use our checklist on how to choose a whole-house remodeling contractor to vet the firms on your list.