The Architecture Design Process Explained: What Happens at Each Stage

Most clients walk into their first meeting expecting to jump straight into floor plans. The reality? A well-run architecture design process has six distinct phases, each building on the last, and skipping any of them almost always leads to budget overruns or design regret.

Why Understanding the Process Matters

Architecture projects fail for predictable reasons. The client expected one thing, the architect delivered another, and nobody caught the mismatch until construction was underway. When you know what each phase produces, you can:

• Ask better questions at the right time instead of raising concerns too late
• Make informed decisions about scope and budget before they're locked in
• Avoid costly revisions by catching issues in sketches rather than steel
• Set realistic timelines — residential projects typically take 8-14 months from concept to breaking ground (see our detailed breakdown of how long it takes to design a house)

The architecture design process explained here follows the standard phases recognized by the American Institute of Architects (AIA), though every firm adapts them slightly. Knowing the right questions to ask your architect at each stage will help you stay engaged and catch issues early. At DEEX Studio, we follow this same framework for projects across Istanbul and beyond, tailoring the depth of each phase to the project's complexity.

Pre-Design: Programming and Site Analysis

Before a single line gets drawn, the project needs a foundation of facts. This phase is called programming — not the software kind, but the architectural kind. It's about defining what the building needs to do.

What happens during programming:

• Client interviews to document functional requirements, lifestyle needs, and aesthetic preferences
• Budget alignment — establishing a realistic cost range and identifying where flexibility exists
• Space programming — listing every room or zone, its square footage, and adjacency requirements
• Regulatory research — zoning codes, setback requirements, height restrictions, and historic district rules

Site analysis runs in parallel. Your architect will visit the property (often multiple times) and document:

• Topography and drainage patterns
• Solar orientation — where light falls at different times of year
• Existing vegetation worth preserving
• Neighboring structures and privacy considerations
• Utility access points — water, sewer, electrical, gas

The deliverable at this stage is usually a project brief or program document: a written summary of everything the design needs to achieve. It's unglamorous but essential. We have a full architectural design brief template that walks you through writing one section by section.

What you should do as a client: Be thorough and honest. If you work from home three days a week, that changes the design. The more your architect knows now, the fewer surprises later.

Schematic Design

This is where things get visual. Schematic design (SD) translates the program document into spatial concepts — rough floor plans, massing studies, and initial sketches that explore how the building could look and feel.

Your architect will typically present two to three concept options, each taking a different approach to the same brief. One might prioritize an open-plan living area. Another might emphasize outdoor connections. A third might maximize upper-floor views.

Typical SD deliverables include:

• Conceptual floor plans at a rough scale
• Building massing models — 3D volumes showing overall form
• Site plans showing the building's footprint on the property
• Preliminary material and palette explorations
• Initial energy and sustainability considerations

At this stage, nothing is final. Walls move easily. Rooms swap positions. That flexibility is the point — changes here cost almost nothing compared to changes during construction.

The client's role: React honestly. Don't just say "I like it." Say why you like it, or what feels off. "The kitchen feels too far from the garden" is far more useful than "it's nice." Your architect needs specific feedback to refine the design.

Once you sign off on SD, the design intent is locked — and the real detailing begins.

Design Development

Design development (DD) is where the chosen schematic concept gets fleshed out. If SD answered "what could this building be?", DD answers "what will this building be?"

Every major decision gets made in this phase:

• Structural system selection — steel frame, reinforced concrete, timber, or hybrid
• Exterior materials finalized — cladding, window types, roofing
• Interior layouts refined — exact room dimensions, door swings, built-in furniture locations
• MEP coordination begins — mechanical, electrical, and plumbing engineers start integrating their systems
• Fixture and finish selections — flooring, countertops, cabinetry styles, lighting concepts

DD drawings are significantly more detailed than schematics. You'll see wall thicknesses, window schedules, section cuts through the building, and enlarged plans of kitchens and bathrooms.

This is also when your architect coordinates with structural engineers, MEP consultants, and landscape architects. These specialists need the design developed enough to begin their own calculations.

Budget check: A cost estimate at the DD stage is far more reliable than during schematics. If the design has drifted beyond your budget, this is the last comfortable point to make significant adjustments.

What you should do: Walk through the plan mentally. Where do you put groceries down when you come inside? Where does laundry go? These practical questions surface problems that drawings alone don't always reveal.

Construction Documents

Construction documents (CDs) are the technical drawings and specifications that contractors actually build from. This is the most labor-intensive phase for your architect — and the least glamorous.

CDs translate every design decision into buildable instructions:

• Detailed floor plans with dimensions, annotations, and grid references
• Building sections and wall sections showing how assemblies come together
• Door and window schedules listing every unit by type, size, and hardware
• Reflected ceiling plans for lighting, HVAC diffusers, and sprinkler heads
• Specifications book — a written document detailing material standards, installation methods, and quality requirements

A typical residential project might produce 20-40 sheets of drawings. Commercial projects can run into the hundreds.

Why CDs matter to you as a client: Vague construction documents lead to contractor "interpretations" — and those rarely favor your budget or design intent. The more precise the CDs, the more accurate your bids and the fewer change orders during construction.

Your architect will also handle building permit submissions during this phase. CDs must comply with local building codes, fire safety regulations, accessibility standards, and energy performance requirements. In Istanbul, this means navigating municipal zoning plans and obtaining the necessary imar durumu approvals — something DEEX Studio handles routinely for clients.

What you should do: Ask your architect to walk you through the CDs. You don't need to understand every notation, but confirm that room sizes, finishes, and key details match what you approved in DD.

Bidding and Construction Administration

Once CDs are complete, the project enters bidding — your architect helps you select and negotiate with contractors.

During bidding, your architect will:

• Issue bid packages to pre-qualified contractors (typically three to five)
• Answer contractor questions through formal addenda
• Evaluate bids — not just on price, but on qualifications, timeline, and approach
• Help negotiate contracts and recommend a contractor

After a contractor is selected, construction begins — but your architect's job isn't over. Construction administration (CA) means your architect stays involved throughout building:

• Site visits at key milestones to verify the work matches the drawings
• Reviewing submittals — material samples and shop drawings for approval
• Processing change orders when unexpected conditions arise
• Issuing clarifications through Requests for Information (RFIs)
• Punch list review at completion — documenting items needing correction

Why CA matters: Without architect oversight, details get simplified, substitutions get made, and the gap between design intent and built reality widens. At DEEX Studio, we consider construction administration non-negotiable — it's how we ensure what gets built is what was designed.

What you should do: Attend site visits when possible. And resist the urge to make changes directly with the contractor — always route decisions through your architect to maintain coordination.

FAQ

How long does the entire architecture design process take? For a typical residential project, expect 6-10 months for design phases (pre-design through CDs) and 12-18 months for construction. Complexity, regulatory approvals, and client decision speed are the biggest variables.

When in the process can I still make major changes? Major changes are easiest and cheapest during schematic design. Design development allows moderate adjustments. Once construction documents begin, changes become expensive because multiple consultant drawings need revision. During construction, changes trigger formal change orders with cost and schedule impacts.

Do I need an architect for a renovation or interior project? It depends on scope. Structural modifications, load-bearing wall removals, and building code compliance issues require an architect. For cosmetic updates, an interior designer may suffice. Many firms, including DEEX Studio, handle both architecture and interior design, which simplifies coordination.

What's the difference between an architect and a contractor? An architect designs the building and produces the documents that describe it. A contractor builds it. Your architect advocates for your interests during construction — they're your representative on site, not the contractor's colleague. Keeping these roles separate protects the quality and integrity of the project.

How much does an architect charge for these services? Fees vary with the scope of services and the project's complexity and location. Some architects work on a fixed fee, others by the hour or on a scope-based basis. Always clarify which phases are included before signing a contract.

Can I skip certain phases to save time or money? Technically yes, but it's risky. Skipping programming leads to designs that don't meet your needs. Skipping DD means CDs are based on incomplete decisions. Skipping CA means no professional oversight during construction. Each phase exists because the industry learned — often painfully — what happens without it. For existing properties, our renovation vs rebuild decision guide helps you determine the right scope before you begin.