An interior design project runs through six stages, each with its own deliverable, its own decisions and its own duration. We explain which decision belongs to which stage, where delays actually come from, and the real ways to speed a project up.
The most common reason interior projects slip is neither materials nor trades — it is late decisions. A project does not move when nobody knows which decision belongs to which stage; and every decision taken after fabrication has started damages both programme and budget.
This article describes the interior design process from the client's side: six stages, the deliverable of each, the decision expected from you, and why each stage stretches or shortens. The aim is not to romanticise the process but to show clearly what you need to do, and when.
Why the process is divided into stages
Staging has one purpose: to get every decision made while reversing it is still cheap. Moving a wall on a plan takes minutes; moving one that has been built takes days and real money. Stages are a safety net that puts decisions in the right order at the right time.
The second purpose is transparency. Because each stage has a concrete deliverable, you can see where you are. "The project is ongoing" reports nothing; "schematic design is out for approval" does.
Stage 1 — Survey and brief
What happens: The space is visited and measured, existing services, structure, ceiling heights and building constraints are recorded. In parallel we hold a long briefing conversation: who will use it, how the day flows, what frustrates you most today, what you will not give up.
Deliverable: Measured survey drawings and a written brief — the document every later decision rests on.
Decision expected from you: The boundary of the scope, a realistic budget range and any fixed date.
What affects duration: Access to the space and getting the decision-makers in one room. If a family or a company has several decision-makers, having them all at the table here prevents the biggest delay later.
Stage 2 — Concept design
What happens: The character of the space is established: spatial layout and circulation, atmosphere and material boards, colour and texture direction, first volumetric sketches. What is discussed here is direction, not centimetres.
Deliverable: A concept presentation — design language, material palette and spatial strategy.
Decision expected from you: Approval of direction. This is the stage to say "I love this language, continue" or "this is not me". Honest feedback at concept is worth more than ten later revisions.
What affects duration: The speed and clarity of feedback. Scattered, contradictory comments stretch this stage more than anything else; one consolidated list is the most efficient route.
Stage 3 — Schematic design
What happens: The approved concept becomes measured drawings: final plan, furniture layout, wet area solutions, ceiling and lighting strategy, key visualisations. Everything now has a dimension and a place.
Deliverable: A dimensioned plan set and 3D visuals — a realistic account of how the space will look at handover.
Decision expected from you: Locking the plan. Wall positions, door swings, kitchen and bathroom layouts freeze here. After this, a plan change is no longer a revision but a redesign.
What affects duration: The number of revision rounds. Knowing the rounds included in your contract and using them in batches saves both time and cost.
Stage 4 — Construction drawings and details
What happens: The invisible stage that decides the job. Power and socket layouts, lighting scenarios and fitting selections, mechanical coordination, joinery fabrication details down to the inside of each cabinet, material specification and quantities. In commercial spaces, fire, escape and licensing requirements are written into the drawings here.
Deliverable: Drawings and specifications a contractor can build from without guesswork.
Decision expected from you: Final material and hardware selections; the final word on technical needs (TV/data positions, smart systems, extra lighting).
What affects duration: Time invested here is time saved on site. An incomplete drawing set leads to improvisation and to the most expensive delay of all — building it twice. For subjects that must be planned from the outset, see our article on interior acoustic insulation.
Stage 5 — Tender, procurement and planning
What happens: Fabrication quotes are gathered and compared against the construction drawings, a procurement calendar is set and a works programme is issued. The critical point: because all quotes price the same drawings and specification, they are genuinely comparable.
Deliverable: A contracted works programme, procurement calendar and a clearly bounded scope.
Decision expected from you: Contractor and supplier approval, order confirmations.
What affects duration: Long-lead items — imported stone, bespoke fittings, particular finishes. Their orders cannot wait for site to start; this stage identifies what must be ordered early. How pricing is built is covered in how interior design fees are determined.
Stage 6 — Site works and handover
What happens: Strip-out and services, first fix, second fix, installation and finishes. Regular site inspections run throughout: is the work built to drawing, do dimensions hold, does the material match the specification?
Deliverable: The completed space handed over with the punch list closed, plus warranty and use information.
Decision expected from you: Fast decisions on site surprises (frequent in older buildings) and interim approvals.
What affects duration: Whether the space is empty or in use, building management hours, hidden conditions found on site and — above all — changes requested at this stage.
What determines the overall programme?
Quoting a single calendar would be misleading, but the variables are known and most are within your control:
Scope and size — a single-room refit and a whole villa do not share a calendar. Condition of the space — older buildings bring surprises that stretch site time. Decision speed — the biggest variable; a project awaiting approval does not move. Procurement — long-lead materials can set the programme on their own. Function — commercial spaces must allow for permits and official processes. Working conditions — occupied spaces are built in zones.
A realistic programme can only be built after the scope and space are seen, so share any fixed date (move-in, opening, season) at the first meeting — the calendar is built backwards from it.
The real ways to speed a project up
You shorten a project by moving through stages cleanly, not by skipping them. What works: naming one decision-maker (or agreeing internally before responding), giving feedback in batches and in writing, sharing a budget range from the start (it removes time spent on an unbuildable direction), deciding long-lead items early and not starting site before the construction drawings are complete. That last one is the most frequently broken rule and the most expensive.
Frequently Asked Questions
How many stages does an interior design project have?
Six: survey and brief, concept design, schematic design, construction drawings, tender/procurement, and site works with handover. Each has its own deliverable and its own approval point.
What is the difference between schematic design and construction drawings?
Schematic design shows what will be built, dimensioned: plans, layout, visuals. Construction drawings explain how: fabrication details, electrical and lighting, specification and quantities. The second set is what actually runs the site.
Can I make changes after approving the design?
You can, but the cost rises with the stage. A change that is nearly free at concept becomes a revision round at schematic, a redraw at construction stage, and demolition plus refabrication on site.
How often will I be updated?
In a healthy process there is an approval meeting at the end of each stage and, during construction, regular progress reports and photographs. We described how studios work internally in how interior architecture firms work.
Does the process differ in a turnkey model?
The stages are the same; the difference is that tender, procurement and site also sit with the team that designed it, which reduces coordination loss. Details in our turnkey interior design process article.
Let's build your programme together
Every space has its own constraints and every job its own critical path. At Kaya + Partners we first visit the space in Ankara and beyond to fix the scope, then tie the stages and approval points into a written works programme — so you always know where you stand.
Get in touch to discuss your project and its timeline. To see what comes out at the end, browse our completed projects, and for our scope of services see Ankara interior design.