If you've ever planned a big trip, you know there's a huge difference between deciding where you want to go and actually figuring out the flights, hotels, and daily itinerary. In architecture, the Design Development (DD) phase is that crucial itinerary-planning stage. It's where the big, exciting ideas from the initial sketches get translated into a concrete, buildable plan.
Think of it as the bridge connecting the "what if" of a concept to the practical "how-to" of construction.
What is Design Development?
If the initial Schematic Design phase was about creating a great floor plan and a compelling exterior concept, Design Development is where we get into the nitty-gritty. It’s where your architect digs in and defines the project’s essential systems and materials—the "bones" of the building.
This means making firm decisions on the structural grid, the type of heating and cooling systems, and the specific materials for the roof, windows, and exterior walls. We move from general ideas to specific, detailed choices that will shape the final look, feel, and performance of the building. Getting this right is everything; it prevents expensive surprises and delays later on.
Where Design Development Fits in the Overall Process
To really grasp its importance, you need to see where this phase sits in the grand scheme of a project. An architectural project isn't just one long sprint; it’s a series of distinct stages, each building on the last.

As you can see, Design Development is the essential middle step. It takes the approved concept and fleshes it out with enough technical detail to ensure the final construction drawings are accurate and fully coordinated.
Here’s a quick breakdown of all the primary stages of architectural design to put it all into context.
The 5 Key Phases of Architectural Design
| Phase | Primary Goal | Key Outcome |
|---|---|---|
| 1. Schematic Design | Explore broad concepts, spatial relationships, and the project's overall look and feel. | Approved floor plans and basic exterior concepts. |
| 2. Design Development | Refine and detail the approved design, integrating all major systems and materials. | A detailed, coordinated set of drawings and outline specifications. |
| 3. Construction Documents | Create the comprehensive technical drawings and specifications for bidding and construction. | A "permit set" and "construction set" of documents. |
| 4. Bidding/Negotiation | Select a general contractor to build the project based on the final documents. | A signed construction contract with a qualified builder. |
| 5. Construction Admin | The architect observes construction to ensure it aligns with the design documents. | A successfully completed building. |
This table shows how each phase logically flows into the next, with Design Development serving as the critical link between the creative vision and the technical execution.
The Real Goal of This Phase: Making Decisions
At its core, Design Development is all about making and documenting decisions. The primary job for your architect is to coordinate every element—from the structure to the window selections—to make sure they all work together seamlessly.
This involves several key activities:
- Finalizing the building layout with exact dimensions for every room, hallway, and opening.
- Selecting the major building systems, like HVAC, electrical, and plumbing, and figuring out how they fit.
- Choosing specific interior and exterior materials, such as flooring types, roofing materials, and siding.
- Developing detailed drawings, including building elevations and key wall sections, that show how it all assembles.
This is your last, best chance to make significant changes without major cost implications. A simple tweak on paper during Design Development is free. That same change once construction starts could easily cost thousands.
This detailed planning also allows contractors to provide much more accurate cost estimates, giving you a clearer financial picture before breaking ground. By nailing down these details now, you create a solid foundation for a predictable and successful construction process.
Why Design Development Can Make or Break Your Project
If Schematic Design is the beautiful sketch of your project's big idea, then the Design Development (DD) phase is where that sketch gets real. This is the moment we roll up our sleeves and figure out exactly how to build it. It’s less about the broad concept and all about the nitty-gritty details that turn a great idea into a functional, buildable, and financially sound reality.
Think of it as turning a concept car into a production model. The initial design was exciting, but now we have to make it work in the real world—coordinating the engine, the frame, the electronics, and the interior so everything fits and functions perfectly.
Locking in Decisions to Control Your Budget
If there’s one thing to take away about this phase, it’s this: Design Development is all about budget control. Every major decision made here—from the type of HVAC system to the specific windows we use—directly impacts the final construction cost. Getting these choices nailed down before a single shovel hits the ground is the single best way to avoid painful and expensive changes later on.
A detailed DD set gives contractors a clear, comprehensive roadmap, which means they can give you a much more accurate price. That kind of financial clarity is gold, giving you the confidence that the project you've envisioned is the one you can actually afford to build.
An hour spent debating a detail in Design Development can save a hundred hours and thousands of dollars in construction. It's the most effective risk management you can do.
By making firm decisions now, we eliminate guesswork and ambiguity. Everyone knows the scope, the materials are locked in, and the core systems are integrated. The result? A smoother, more predictable construction process for everyone involved.
Giving Substance to the Architectural Vision
Beyond the budget, this is where the building's true character comes to life. Your architect’s job is to weave all the separate threads together—structure, systems, materials, and aesthetics—into a cohesive whole.
This is where we get into the specifics:
- Finalizing the Structural System: We work closely with the structural engineers to define the building’s skeleton, making sure it supports the design intent.
- Integrating MEP Systems: This involves figuring out the intricate puzzle of the Mechanical, Electrical, and Plumbing (MEP) systems and how they will run through the building without conflicts.
- Selecting Exterior Materials: We’ll choose the exact cladding, roofing, and window products that create the building’s look while meeting performance standards.
- Defining Interior Finishes: It’s time to make firm selections for flooring, wall materials, lighting, and other key interior elements that shape the user experience.
This level of detailed coordination is essential. The U.S. architectural services market is expected to hit around USD 158 billion by 2034, and a huge part of that growth comes from complex projects where early, precise planning is non-negotiable. Sectors like healthcare architecture, for example, have incredibly specific needs that absolutely must be ironed out in DD. Diving into these U.S. architecture market trends really highlights how critical this planning stage is.
Ultimately, a robust Design Development phase ensures the final building is more than just a structure—it's a thoughtful, well-executed asset. It’s the bridge that connects a client's vision to the hard realities of construction, setting the project up for success from day one.
Key Deliverables Produced During Design Development
This is where the vision starts to get real. As the design development phase wraps up, you'll see the abstract ideas and rough sketches from earlier conversations transform into a set of tangible, highly detailed documents.
Think of this package as the official instruction manual for your project. It's the bridge between imagination and construction, translating months of decisions into a clear, unified language that everyone—engineers, contractors, city officials—can understand and follow. Knowing what to expect here is key to giving sharp feedback and feeling confident about where things are headed.

I like to tell clients to view these deliverables as the first complete draft of their building's biography. Each document tells a specific part of the story, from how it sits on the land to the exact materials that will give it character. Let's walk through what you'll actually be holding in your hands.
The Detailed Drawing Set
The heart of the design development package is a much more robust set of architectural drawings. We're moving way beyond the conceptual sketches of the schematic phase. Now, everything is coordinated, measured, and drawn to scale.
Refined Floor Plans: These aren't just bubbles and arrows anymore. You'll see precise dimensions for every single room, wall, door, and window. We also lock in the locations for major fixtures like sinks and toilets, built-in cabinetry, and any other critical clearances to make sure the space actually works.
Building Elevations: These are the exterior "portraits" of your building from every angle—north, south, east, and west. This is where the final look is defined. We specify the exact window styles, door designs, and where exterior materials like brick, metal panels, or siding begin and end.
Key Building and Wall Sections: If a floor plan is like looking down from the ceiling, a section drawing is like slicing the building in half and looking at it from the side. These drawings are crucial for understanding the building’s vertical relationships—showing true ceiling heights, roof pitches, and how the different floors stack up on top of one another.
A huge piece of this is the comprehensive site plan, which lays out exactly how the building relates to the property. It covers everything from grading and drainage to parking layouts and major landscaping features.
The Recipe Book: Preliminary Specifications
Along with the drawings, you'll get what we call an "outline specification" or a preliminary "spec book." This document is the project's recipe book. It’s a detailed list of all the ingredients needed to build it right.
This is where we get specific. For instance, "brick exterior" becomes a specific brick from a particular manufacturer. "Commercial windows" turns into a detailed set of performance criteria, like required U-values for energy efficiency. This document is absolutely essential for getting an accurate cost estimate.
The spec book is where quality is defined. A set of drawings shows you what the building looks like, but the specifications tell you what it’s made of and how it has to perform.
This detailed list leaves no room for guessing about the quality standards. It covers everything from the grade of structural steel and the type of drywall to the performance specs for the roofing membrane.
The Integrated Engineering Drawings
Design development is also the phase where the architect’s vision truly merges with the technical know-how of our engineering consultants. Your deliverable package will include the first real drawing sets from these key partners, showing how the building’s vital systems are woven into the architectural design.
These coordinated drawing sets typically include:
- Structural Drawings: The structural engineer provides the plans for the building’s skeleton. These drawings detail the foundation, columns, beams, and floor framing—everything that holds the building up.
- MEP System Layouts: The Mechanical, Electrical, and Plumbing (MEP) engineers map out the building’s circulatory and nervous systems. This means you'll see layouts for the HVAC ductwork, primary electrical conduit runs, and the main plumbing lines.
By the end of this phase, all these deliverables come together to form a cohesive, deeply detailed picture of your project. They give everyone the clarity needed for a final budget check and create the solid foundation we’ll use to produce the final construction documents.
Coordinating the Full Project Team
If Schematic Design is the broad-strokes sketch of your project, Design Development is where the entire team of specialists rolls up their sleeves and gets to work. Think of your architect as the quarterback. They’re no longer just talking to you; they're now directing a whole roster of experts to make sure every single piece of the puzzle fits together.
This isn't just about making a concept look pretty—it's about making it buildable, functional, and sound. It’s a carefully orchestrated process where the structural engineer’s plan for the steel frame has to perfectly align with the mechanical engineer’s ductwork, and neither can conflict with the architect's vision for the interior spaces. This is the behind-the-scenes collaboration that truly brings a building to life.

Assembling the Core Consultant Team
During Design Development, the project roster expands quite a bit. Your architect will bring in a hand-picked group of engineering consultants, each a specialist in their own right, to layer in the technical details that are critical for the building’s performance and safety.
Structural Engineers: These are the folks who figure out the building’s “skeleton.” They’re responsible for designing the foundation, columns, and beams that will hold everything up, ensuring the structure is strong enough to withstand all the forces it will face.
MEP (Mechanical, Electrical, and Plumbing) Engineers: This team handles the building’s central nervous system and vital organs. They design the HVAC systems for climate control, lay out the entire electrical grid, and map out every pipe for water supply and drainage.
Civil Engineers and Landscape Architects: The civil engineer deals with everything happening on the site outside the building's foundation—things like grading, stormwater drainage, and connecting to public utilities. The landscape architect then comes in to shape the outdoor experience, from green spaces and parking to walkways that guide people to the front door.
This collaborative model is essential in today's market. The architectural profession is constantly changing, with new technologies and economic shifts redefining how projects get done. For instance, with rising interest rates impacting private development, many firms are seeing more opportunities in public-sector work like healthcare and education. You can discover more about these U.S. design industry trends to get a better sense of the evolving landscape.
The Value of Early Contractor Involvement
It used to be common to wait until the plans were nearly finished before bringing a general contractor on board. That's changing, and for good reason. Involving a contractor during Design Development, often under what's called a pre-construction services agreement, is one of the smartest moves a client can make.
Bringing a contractor into the fold early for a constructability review provides an invaluable reality check. They see the project through the eyes of the people who will actually build it, and they can spot potential headaches or cost-saving opportunities that are invisible on a set of drawings.
Their practical, on-the-ground experience is priceless in a few key areas:
Constructability Reviews: The contractor can look at a proposed detail and immediately know if it’s going to be a nightmare to build. They might suggest a simpler, more efficient way to achieve the exact same design intent, saving time and money.
More Accurate Cost Estimating: As the design gets more detailed, the contractor can provide increasingly accurate cost feedback. This running tally helps keep the project tethered to the budget, preventing the shock of bids coming in way over what you expected.
Material and System Suggestions: Contractors are in the trenches every day. They know which materials have long lead times, what local subcontractors excel at, and which new building systems might be a better fit for your project.
Navigating Codes and Authorities
Finally, a huge part of the coordination effort is managing the maze of building codes, zoning ordinances, and local review boards. Your architect takes the lead here, ensuring the design doesn't just look good, but is also fully compliant with all legal requirements.
This often means submitting the drawing set to the local building department for a preliminary review. It is far, far easier to adjust a wall or move a plumbing line during Design Development than it is after the final construction documents are complete. Finding a code issue late in the game can trigger significant delays and expensive redesigns.
By managing this complex dance between designers, engineers, builders, and city officials, the architect ensures the project moves steadily toward the finish line. This intensive coordination is the invisible foundation of every great building.
How Design Development Adapts to Different Project Types
The design development process isn't a rigid, one-size-fits-all formula. Think of it more like a flexible framework that adapts to the unique personality and challenges of each project.
Just as a chef uses different techniques for grilling a steak versus baking a cake, an architect has to tailor their approach for a brand-new skyscraper, a historic landmark, or an old warehouse being given a second chance. This adaptability is what makes the phase so critical. The core goals—refining the design, integrating systems, and defining materials—are always there, but the priorities shift dramatically depending on the building's history and future.
New Commercial Construction
When you're dealing with a brand-new commercial building, Design Development is all about optimization. With a clean slate, the main focus is on wringing every last drop of potential out of the site to create a high-performance, future-proof asset.
The team’s energy gets channeled into a few key areas:
- Site and Systems Integration: This is where we fine-tune the building’s orientation to capture the best natural light, reduce unwanted solar heat, and weave in hyper-efficient MEP (Mechanical, Electrical, and Plumbing) systems. Every decision, from where a window goes to which HVAC unit gets specified, is weighed against its impact on long-term running costs.
- Code and Zoning Navigation: New builds have to perfectly align with a dense web of modern zoning laws, building codes, and accessibility standards. This phase involves painstaking coordination to ensure every nut and bolt of the design is fully compliant before a shovel ever hits the ground, preventing very expensive delays later on.
Adaptive Reuse Projects
Adaptive reuse projects are a completely different beast. Here, the architect plays part detective, part surgeon. The mission is to breathe new life into an existing structure by seamlessly blending the old with the new.
This demands a highly investigative approach during Design Development. The team has to conduct thorough assessments of the building's structural integrity, the condition of its materials, and whatever infrastructure might be hiding in the walls.
The core puzzle in adaptive reuse is honoring the building's past while making it viable for the future. It’s about strategically inserting modern systems without compromising the character that made the building worth saving in the first place.
Key activities often include detailed surveys and sometimes even selective demolition just to see what you're really working with. The design then has to cleverly weave new, efficient systems around the existing framework, a process that requires a ton of creative problem-solving.
Historic Preservation
With historic preservation, you take that level of care and turn it up to eleven. The guiding principle here is reverence for the building's original craftsmanship and historical significance. Design Development in this context is less about invention and more about meticulous restoration and incredibly sensitive intervention.
The focus shifts to deep research and careful specification:
- Material and Technique Research: Architects and specialist consultants dig into the original construction methods and materials. The goal is to repair and replace elements in a way that is historically accurate and authentic.
- Meeting Modern Codes Sensitively: One of the biggest hurdles is upgrading the building to meet contemporary safety and accessibility codes without destroying its historic fabric. This often means sitting down with historic preservation offices to find creative, acceptable compromises.
The global demand for these specialized skills is on the rise. Driven by infrastructure modernization, the architectural services market was valued at USD 215.13 billion in 2025 and is projected to climb to USD 273.97 billion by 2029. You can explore more findings in this architecture industry outlook that show just how complex modern projects are becoming.
Ultimately, whether it’s a new build, a clever reuse, or a careful restoration, the architect's design development phase is where specialized knowledge is applied to turn unique challenges into a successful building.
Answering Your Questions About Design Development
Jumping into the design development phase can feel a bit like learning a new language. It's a technical, collaborative, and incredibly important part of the journey from a big idea to a finished building.
Getting your questions answered upfront helps you feel confident and ready to make the smart decisions this stage requires. Here are some of the most common questions we hear from clients as we dive into this critical part of the process.
How Long Does This Phase Typically Take?
The honest answer? It depends entirely on the project's scale and complexity.
For a fairly straightforward commercial building, you're likely looking at a timeline of two to four months. That's usually enough time to get all the engineering disciplines—structural, mechanical, electrical—fully coordinated and to give you, the client, a chance for thoughtful reviews without feeling rushed.
But what about a more complex project? Something like a large-scale adaptive reuse or a delicate historic preservation can easily stretch to six months or even longer. These projects demand a lot of upfront investigation and coordination with specialized consultants, which naturally adds to the timeline. A good architect will lay out a realistic schedule from day one so there are no surprises.
How Much Does Design Development Cost?
Architectural fees are usually calculated as a percentage of the total construction cost. Within that overall fee, the design development phase itself typically represents 15% to 20% of the total. So, if the total architectural fee for a project is $100,000, you can expect the DD portion to be in the ballpark of $15,000 to $20,000.
It’s better to see this not as a cost, but as an investment in clarity. A meticulously planned design development phase is the single best tool you have for locking in an accurate construction budget and avoiding expensive changes later on.
This investment pays huge dividends. It ensures the project is clearly defined, the moving parts are all working together, and the budget is solid before a single shovel hits the dirt. It’s all about preventing those costly surprises during construction.
What Is the Client's Role During This Phase?
Your role is absolutely essential. This is where your vision really starts to take physical form, and your input is needed to make it happen. You'll be making the final calls on materials, building systems, and specific layouts that give the project its character and functionality.
Your architect will come to you with detailed drawings, physical material samples, and product specifications for you to review and approve. Your job is to provide clear, timely feedback. Being engaged and decisive at this stage is what keeps the project moving smoothly and ensures the final design is exactly what you envisioned and budgeted for.
At Sherer Architects, LLC, we make it our job to walk you through every question and decision during the design development phase. We're here to make sure your vision becomes a detailed, buildable, and ultimately successful reality. Learn how our collaborative process can bring your commercial, adaptive reuse, or historic preservation project to life.

















