Interior design cost is determined by project scope, spatial complexity, material specification, and the depth of design involvement required. The studio charges based on the work involved across five stages: Discovery, Concept, Concept, Design & Specification, Commission, and Reveal. Understanding what drives cost helps you budget realistically and identify where investment delivers the most value.
How does project scope affect design cost?
Project scope — the size, ambition, and number of spaces involved — is the primary cost driver. A single-room refresh costs less than a full commercial fit-out because the studio's Discovery phase is narrower, fewer materials need specification, and Commission and Reveal take less time. Beaulieu Dental Practice, a commercial project, required discovery of clinical workflows, specification of infection-control surfaces, and coordination across multiple treatment rooms. That scope was larger than, say, specifying a single salon reception area.
Residential projects like the London Embankment Apartment and Witham Project show this clearly. An apartment renovation that touches kitchen, bathrooms, and living spaces involves more discovery interviews, more material selections, more coordination with trades, and longer Reveal phases than a single bedroom refit. The studio doesn’t charge more for complexity within the same process; it charges for the full breadth of stages required. A smaller scope means fewer stages consume resources.
What role does spatial complexity play in design investment?
Spatial complexity — the number of surfaces, their interaction, and the technical demands of the space — directly influences cost. A hair salon like Fruittii requires design of backwash stations, styling stations with specific lighting and mirror angles, client comfort zones, and staff workflows. A dental practice must account for clinical chair positioning, sight lines, acoustic isolation, and material durability under sterilisation. An estate agent office like Keystones involves client meeting zones, staff desks, storage, and a reception that reflects brand identity. Each demands different expertise during Concept, Design & Specification.
Residential complexity varies too. The Tone at Canary Wharf project involved open-plan coordination, built-in joinery, and material transitions across living and sleeping zones. The Witham Project required different solutions based on existing architecture and client lifestyle. More surfaces, more transitions, and more technical requirements mean the Concept, Design & Specification phase expands. The studio must research materials more thoroughly, produce more detailed drawings, and coordinate more closely with manufacturers and contractors during Commission.
How does material specification influence what you invest?
Material choice is where design investment becomes tangible and lasting. Specifying a durable, timeless upholstery for a commercial reception chair costs more than a commodity fabric, but it survives five years instead of two. Choosing a stone surface that matures rather than dates requires research into grain, finish, and supplier reliability. Selecting joinery that uses solid timber and traditional joints instead of veneered MDF demands communication with makers. During Concept, Design & Specification, the studio sources, tests, and documents every material so that Commission and Reveal proceed without compromise.
This investment isn’t arbitrary. A commercial project like Tone at Canary Wharf or Fruittii Hair Salon demands materials that withstand daily use, frequent cleaning, and visual scrutiny. A residential project like the London Embankment Apartment benefits from materials chosen for permanence: finishes that age well, natural materials that develop character, and selections that reflect your own taste rather than passing fashion. The cost of specification is the cost of foresight — choosing once, correctly, rather than replacing failed materials or dated choices later.
What does each stage of the process cost to deliver?
The studio works through five named stages, each with real resource and cost implications. Discovery is research: understanding your brief, space, uses, and aspirations. The studio measures, photographs, interviews stakeholders, and reviews constraints. This is cheaper than later stages because it’s primarily investigation, but it’s essential — a shallow Discovery produces a weak Concept. Concept is ideation: the studio proposes direction, mood, material families, and spatial solutions. Concept, Design & Specification is where ideas become buildable: detailed drawings, product schedules, color samples, and manufacturer specifications. Commission is procurement and coordination: ordering, managing lead times, and liaising with contractors. Reveal is installation oversight and handover.
Each stage builds on the last. A complex project like Beaulieu Dental Practice needs longer Discovery (clinical protocols are intricate), thorough Concept development (workflows must be right), detailed Concept, Design & Specification (compliance is non-negotiable), careful Commission (product timing is critical in a working practice), and precise Reveal (installation around operational schedules is complex). A simpler project needs less time in each stage, but the sequence is the same. The investment you make corresponds to the time each stage demands.
Why does residential design cost differ from commercial?
Residential and commercial projects incur different costs because their pressures differ. A residential space like the London Embankment Apartment or Witham Project is personal: the studio must understand how you live, what matters to you, and what will feel right for years. Discovery is longer because it’s intimate. Concept is more iterative because taste is subjective. Concept, Design & Specification focuses on durability and timelessness rather than brand messaging. There are fewer regulatory constraints (no clinical or health-and-safety protocols), but more emphasis on detail and finish quality because you live with the result daily.
Commercial projects like Keystones Estate Agent, Fruittii Hair Salon, or Beaulieu Dental Practice involve brand, workflow, compliance, and client experience. Discovery must include operational staff and sometimes end-users. Concept must align with brand and function. Concept, Design & Specification demands compliance documentation and durability warranties. Commission involves coordination with multiple trades on fixed timelines. Reveal often happens while the business operates. The cost structure reflects these different pressures: residential emphasizes the luxury of time and personalization; commercial emphasizes reliability, compliance, and business impact.
What questions should you ask before budgeting?
Before you assess cost, clarify your actual scope. Are you redesigning one room or multiple? Are you keeping existing structure and finishes or starting fresh? Do you need compliance advice (kitchens, bathrooms, commercial spaces) or creative direction only? Are you changing layout or living with the existing spatial plan? Are you furnishing from scratch or working with pieces you already own? The honest answer to each shapes what the studio must deliver. A living room refresh where you keep the sofa and windows is a different cost to a full residential refit with new kitchen and bathrooms.
Ask also about timeline and coordination. If contractors are already on site, design can overlap with Commission, reducing total duration. If you’re planning ahead, Discovery can be thorough and unhurried. If trades must wait for drawings, Concept, Design & Specification must be fast and accurate, which may require more detail work. Finally, understand what matters most: is the investment in conceiving something genuinely new (Concept), or in getting specification and sourcing right (Concept, Design & Specification), or in ensuring flawless execution (Commission and Reveal)? Different emphases lead to different resource allocation and cost.