Two fundamentally different ways to deliver a custom home or major Ottawa renovation: hire an architect who designs and tenders to multiple builders, or hire a design-build firm that handles design and construction under a single contract. Each model has different cost structures, timelines, risk profiles, and design outcomes. We worked with [Black Sable Group](https://blacksablegroup.com) to map honest tradeoffs between the two so you can choose the right approach for your project.
Both deliver a finished home; the path is very different.
You hire an architect first. They design the home, prepare construction drawings, and tender the project to 3–5 pre-qualified builders. You sign a separate construction contract with the winning builder. The architect remains involved during construction as your representative — reviewing progress, ...
You hire a single firm that handles both design and construction. Their in-house designer (or partnered architect) develops the project; their construction division builds it. One contract, one point of accountability.
Headline construction cost is similar; total cost depends on design fees and how change orders are handled.
Architectural fees typically 10–15% of construction cost in Ottawa for full service (concept through construction administration). For a $1M build, that's $100,000–$150,000 in design fees. Construction is competitively tendered, often producing 5–12% lower construction pricing than design-build equi...
Design fees typically 4–8% of construction cost, often rolled into the overall contract. Construction pricing is single-source rather than competitively tendered, but the integrated process typically produces fewer change orders.
Within ±5% for most Ottawa projects. Architect-led often produces lower construction pricing offset by higher design fees. Design-build produces lower design fees offset by less price competition.
Schedule is where the models genuinely differ.
8–14 months design phase, 4–8 weeks tender, then construction. Total delivery typically 18–30 months for a custom home. Schedule is often longer because design is fully complete before construction starts.
Design and construction overlap. Foundation can begin while interior finishes are still being selected. Total delivery typically 12–18 months for a custom home — meaningfully faster.
Honest assessment of which approach fits which project.
Highly architectural designs where design distinction is the main project goal, complex sites with site-planning challenges, projects where tender competition is likely to produce material savings, owners who want a third-party advocate during construction, and projects pursuing design awards or mag...
Schedule-sensitive projects, owners who prefer a single point of accountability, projects where the firm has demonstrated expertise (kitchens, basements, additions), renovations rather than full custom builds, and owners who don't have time or interest in managing the architect-builder interface. Es...
Different verification questions apply to each model.
Confirm OAA (Ontario Association of Architects) license, professional liability insurance, portfolio of completed homes (not just commercial work if you're building residential), and at least two references from completed projects.
Confirm in-house design capability (vs. subcontracted design that's then handed off), portfolio of design-build projects (not just construction), and the same construction credentials you'd verify on any builder (insurance, WSIB, references).
Design-build dominates the renovation market (kitchens, bathrooms, basements, additions). Architect-led dominates large custom-home projects above $2M and architecturally distinctive designs.
Difficult. Architect-led projects can shift to design-build at the construction phase if the architect is willing to step back. Design-build can rarely shift to architect-led mid-project.
Sometimes — particularly for complex custom homes where you want both architectural distinction and integrated execution. Costs more but can produce the best result on the right project.
Visit completed projects and ask the homeowners what changed during the process. Look at the firm's portfolio for design diversity (not just one repeated style). Confirm whether design is in-house or subcontracted.
Construction administration — site visits at key milestones, review of contractor RFIs, approval of change orders, and payment certification. The architect represents your interests against the builder. Typically 5–10% of architectural fees are budgeted for this phase.