Two Ways to Get a Multiplex Built
Deciding how to manage your construction process is the single biggest factor in controlling your final budget.
We routinely speak with property owners who want clarity on the best path forward for their new investment.
The debate over a design build vs design bid build multiplex development usually centres on cost certainty versus competitive pricing. Our team offers both delivery methods, and the multiplex design-build page explains the unified approach in detail.
This guide provides a factual comparison to help you choose the right model.
One-line summary
Design-bid-build gives you competitive bids on finished drawings. Design-build gives you pricing during design and one accountable firm. Which matters more depends on where you are starting from.
Side-by-Side Comparison
The fundamental difference lies in how many contracts you sign and when you lock in your final price. We use the updated 2026 Canadian Construction Documents Committee (CCDC) standards to illustrate these differences clearly. A traditional approach uses a CCDC 2 stipulated price contract after drawings are done, while the unified method uses the newly revised CCDC 14 form.
| Factor | Design-bid-build | Design-build |
|---|---|---|
| Contracts | Two or more (designer, builder) | One |
| Price known | After bids on finished drawings | Estimated during design, fixed after feasibility and scope |
| Risk of over-budget drawings | Higher | Lower |
| Schedule | Sequential: design, then bid, then build | Overlapping |
| Change orders | More common from drawing gaps | Fewer, priced before work |
| Accountability | Split between designer and builder | Single point |
| Competitive bidding | Yes | Not on the full project |
| Owner control of design | Full | Full |
You can see how the risk shifts between the owner and the contractor in each column. Our clients often prefer the single point of contact because it eliminates the typical friction between architects and trades.
Who Holds the Risk
Risk in construction means taking financial responsibility for delays, design errors, or conflicting blueprints. We absorb that risk completely in a unified contract, whereas traditional methods leave the owner mediating disputes.
In design-bid-build, the designer is strictly responsible for the drawings, and the builder is only responsible for building exactly what is on the page. Our experience shows that when a structural beam clashes with an HVAC duct on the plans, both separate parties will point fingers at each other.
The owner ends up paying for the fix and the delay. We bypass this issue entirely in design-build, because the same firm owns both the design and the construction phases.
Any gaps or measurement errors are the internal team’s problem to solve at no extra cost to you. Our approach ensures that major structural responsibilities, which fall under the 7-year Tarion warranty period in Ontario, are handled by one accountable entity from day one.
Change-Order Exposure
Change orders occur when construction details are missing from the initial permit drawings, causing unexpected costs once the walls are open. We mitigate this exposure by pricing every detail before the heavy machinery ever arrives on site.
Drawings made purely to secure a city permit are rarely detailed enough for actual construction. Our estimators review these early plans and often find critical gaps that would become expensive surprises later.
A recent Université Laval study of over 1,600 Canadian construction projects found that traditional delivery methods faced an 18.4 percent average schedule growth due to these exact changes. We see far better results with a unified team, where the people drawing the plans are also the ones building the structure.
Because the design is optimized for construction from the start, any specific alteration you request is priced before it happens. Our guide to the fixed-price contract explains exactly how allowances and changes are handled to protect your budget.
Schedule Overlap
A unified contract allows the construction team to begin ordering materials and planning site work while the architect is still finalizing the details. We use this overlapping strategy to shave weeks or even months off the total timeline.
Design-bid-build is strictly sequential, meaning design must finish entirely before bids go out, and bids must return before a construction contract is signed. Our project managers find that this waiting game leaves sites sitting idle during prime Canadian building seasons.
Design-build overlaps these critical phases efficiently. We run the municipal zoning review during the concept stage, actively price materials during design, and order long-lead items like windows the moment the layout is stable.
In October 2026, the City of Toronto released new pre-approved multiplex designs created by LGA Architectural Partners to speed up building permits. Our team uses expedited approval systems like these to get shovels in the ground faster.
When Design-Bid-Build Still Makes Sense
The traditional method is highly effective if you already possess a completed, fully priced set of blueprints. We gladly step in to bid on these ready-to-build projects when owners want to hire an architect then builder in separate stages.
This approach is also useful when your site has unusual historical constraints requiring a specialized heritage architect. We recommend this route if you meet the following criteria:
- You already have complete, permit-ready drawings from an architect you trust.
- The existing drawings have been accurately priced and comfortably fit your current budget.
- You want several different builders submitting competitive bids on the exact same scope of work.
- Your project is highly unusual and needs a specialist designer who does not handle physical construction.
In those exact cases, builders are happy to price and construct from your finished drawings. We can also review your external blueprints for basic cost and buildability before you go out to the open market for bids.
When Design-Build Usually Wins
The unified approach is the clear winner for owners who want maximum budget certainty and a single point of accountability from day one. We recommend this structure for anyone starting a design build fourplex project from scratch.
The 2024 FMI Design-Build Utilization Study projects this delivery method will soon account for nearly half of all construction spending because it eliminates expensive delays. We see this method solving the biggest frustrations for property investors.
This route is generally the best choice in several common scenarios:
- You are starting with an empty lot and a great idea, rather than finished architectural drawings.
- Strict budget certainty matters significantly more to your financing than collecting multiple competitive bids.
- You prefer having one dedicated point of contact handling everything from the initial feasibility study to handing over the keys.
- Your project timeline is tight, and high carrying costs make every delayed week incredibly expensive.
- You have already had an external design come back severely over budget and need practical adjustments.
GTA Projects
Managing the varying municipal zoning bylaws across the Greater Toronto Area requires specialized local knowledge. We keep our design and construction teams in the exact same room to ensure no obscure regional rules fall through the cracks.
Outside Toronto, the regulatory landscape shifts dramatically from city to city. Our work on Vaughan projects proves this, because Toronto’s Expanding Housing Options in Neighbourhoods (EHON) framework does not apply there.
Instead, Vaughan has its own specific zoning and additional residential unit permissions that tightly shape the final design. We monitor all regional updates closely, including Toronto’s recent move to permit fourplexes city-wide by-right.
Having both the designer and builder fully aligned prevents costly redesigns when a property crosses a municipal boundary.
What a Design-Build Project Looks Like Week by Week
A unified multiplex delivery method follows a highly structured, overlapping timeline to maintain steady progress. We break this process down into distinct phases so owners know exactly what to expect at every major milestone.
Property owners considering this route frequently ask how the daily work is actually organized.
Feasibility and Concept Development
The first month is dedicated to proving the lot can legally and financially support your vision. We spend Weeks 1 and 2 conducting a zoning pull, creating an envelope model, screening for heritage status, and generating a CAD budget range.
Weeks 3 through 6 focus entirely on design concepts and initial pricing. Our architects present two or three different layouts with attached costs, and you choose one to refine.
Design Development and Contract Signing
The middle weeks turn the rough concept into a legally binding, ready-to-build plan. We use Weeks 6 through 10 to develop the structure, mechanical layouts, energy modelling, and interior finishes.
The cost estimate is updated at every single meeting, and long-lead materials like structural steel are identified early. We finalize the permit set and sign the fixed-price contract, complete with allowances and a draw schedule, between Weeks 10 and 12.
Permits, Pre-Construction, and Active Building
The final stretch involves securing the official green light and executing the physical work. We spend Months 3 through 6 handling examiner responses, submitting utility applications, completing Tarion warranty enrolment using the new 2026 Home ID system, and scheduling specialty trades.
Months 6 through 16 are dedicated entirely to active construction on the site. Our dedicated project manager runs the daily site operations, handles all municipal inspections, and provides you with continuous updates.
| Phase | One team handles |
|---|---|
| Feasibility | Zoning, servicing, budget |
| Design | Drawings and pricing together |
| Permits | Submission and examiner responses |
| Construction | Trades, inspections, schedule |
| Closeout | Occupancy and Tarion PDI |
The core advantage here is not that required steps are skipped or ignored. We simply overlap these steps and ensure the exact same team carries your project through every single handoff.
Choosing Your Route
Every successful multi-unit project must start with a written, comprehensive feasibility report. We use this initial document to tell you exactly what the lot can carry and roughly what the entire build will cost.
Once you have the raw data, you must decide which design build vs design bid build multiplex method aligns best with your financial goals and risk tolerance. Our team is ready to review your property details and help you select the safest path forward.
Start planning your build today. We encourage you to talk through delivery options with us so you can confidently launch your next investment.