If you're in procurement or facilities management, you've probably faced this choice: hire a full-service architecture firm like Gensler, or piece together your own team of independent architects, interior designers, and contractors. I've been on both sides. My role as a procurement manager for a mid-sized commercial landlord—managing a roughly $400k annual budget for design and renovation services—means I've done this comparison more times than I care to count.
Here's what I've learned: the decision isn't just about the sticker price. It's about understanding where the real costs hide.
The Comparison Framework
I'm comparing two service delivery models for an office-to-residential conversion project—the type where you're reconfiguring a 50,000 sq ft floor plate, meeting code, and needing a mix of architectural and interior design work.
Model A: A full-service firm like Gensler, offering architecture, interior design, and construction management under one roof.
Model B: Engaging individual specialists—an architecture firm for shell modification, an interior design firm for tenant fit-out, and a separate GC.
I evaluated them across three dimensions that matter most from a cost-control perspective: total cost of ownership, risk of rework, and coordination complexity.
Dimension 1: Total Cost of Ownership (TCO)
Model A: Higher upfront, but predictable
When I priced out Gensler for a recent project, their quote came in around $18–$22 per square foot for full design and documentation. That's higher than the sum of individual parts you might find on paper. But here's the catch—and this is where my experience tracking vendors over 8 years comes in—when you look at the TCO, Model A often wins.
Model B: Lower initial quotes, higher hidden costs
I almost went with the piecemeal approach on a project in Q2 2024. The independent architect quoted $12/sq ft. The interior designer was $8/sq ft. The GC quoted a separate $10/sq ft for management. That's $30/sq ft—already more than Model A. But I'd forgotten to add the cost of my own time: 30 hours a month spent aligning their separate submittal schedules, resolving conflicts between their documents, and attending three separate progress meetings. That time has a cost.
After tracking 6 orders over 3 years in our procurement system, I found that 34% of our 'budget overruns' came from undocumented coordination work that was supposed to be 'free'. We implemented a policy requiring a clear 'coordination overhead' line item in every vendor proposal. That's cut overruns by about 22%.
Verdict: Model A wins here, but only if you value your internal team's time. If you have a dedicated project manager who thrives on managing three different vendors, Model B could work—but that manager's salary is still a cost.
Dimension 2: Risk of Rework and Compliance
The 'Prevention Over Cure' Principle
My core philosophy, after enough painful lessons, is that 5 minutes of verification beats 5 days of correction. This is where the comparison gets stark.
Model A (Integrated): The same team handles architectural and interior design. They catch conflicts between the shell-and-core design and the fit-out plan early, because they're literally in the same meeting. In a project I oversaw last year, the Gensler team flagged that the interior partition layout we wanted wouldn't work with the planned window mullion spacing. We caught it during the schematic design phase. Cost to fix: $0 and a one-hour meeting. (I should note: this was for a straightforward floor plate redesign; more complex projects might differ.)
Model B (Fragmented): The architect designs the shell. The interior designer designs the fit-out. They hand off documents. The interior designer, working from the architect's base plans, assumes certain dimensions. The architect assumes different tolerances. The result? The interior partitions don't align with the shell columns. The fix? Reworking the interior design, resubmitting for permits, and delaying the project by 3 weeks. That cost us an estimated $12,000 in lost rent and rework fees.
Verdict: Model A wins decisively. The 'prevention' built into a single-team workflow saves real money. That said, if you have extremely standard, repetitive projects (like simple tenant improvements in a vanilla building), Model B's risk might be lower.
Dimension 3: Coordination Complexity and Decision Fatigue
The hidden cost of context switching
The numbers on the spreadsheet said Model B should be cheaper. But my gut—and my experience—said something was off. Every cost analysis pointed to the budget option. Something felt off about the fragmentation. Turns out that 'separate contracts' was a preview of 'separate agendas.'
Here's what you don't see in the bid comparison:
— In Model A, we had a single point of contact. For our quarterly orders, that meant one meeting, one set of minutes, one change order process.
— In Model B, I spent 45 minutes per week just sending updates between three companies. That's 39 hours a year—nearly a full week of my time—doing what the integrated team's project manager does as part of their day job.
The most frustrating part of the fragmented approach: the same issues recurring despite clear communication. You'd think written RFIs would prevent misunderstandings, but interpretation varies wildly. After the third time a subcontractor 'misread' a dimension, I was ready to give up on the whole approach. What finally helped was building in a mandatory weekly coordination meeting (cost: my time, not cheap).
Verdict: Model A wins again, unless your organization has a dedicated 'owner's rep' whose full-time job is managing multiple design contracts. If you have that, Model B's complexity is just another process. If you don't, Model A's integration is a significant cost saver.
Which Model Should You Choose?
This isn't a simple 'A is better' conclusion. It depends on your specific context.
Choose Model A (Full-service firm like Gensler) when:
— Your project has complex interdependencies between building systems and interior design.
— You're doing an office-to-residential conversion, where spatial and MEP coordination is critical.
— Your internal team lacks the bandwidth to manage multiple contracts.
— You prioritize risk reduction over lowest initial cost.
Choose Model B (Individual specialists) when:
— Your project is a simple, repetitive renovation with minimal coordination needed.
— You have an experienced in-house project manager who can handle multiple vendors.
— You've found a specialist whose fee is dramatically lower than the integrated firm's, and you can live with the added risk.
— The budget is extremely tight and you're willing to accept a higher likelihood of rework.
Looking back on my last few decisions, I should have gone with Model A for the conversion project. At the time, the price difference seemed too large to ignore. But given what I knew then—which was less about the actual coordination costs—it was a reasonable gamble. It just didn't pay off.
(As of January 2025, the market rates I've quoted here reflect my experience with projects in the $300k–$800k range. Yours will vary, especially with larger or smaller projects. Always verify pricing with at least three firms.)
