Office Interior Design Service Fees: Lump Sum, % or Sq Ft?

Ask three firms for an office interior design service quote and you may get three kinds of number: a fixed fee, a percentage of the works, or a rate per square foot. They are hard to compare, and each shifts risk differently.

This guide is for owners, admin managers and facilities teams hiring an office designer. It explains the four fee models, the official Malaysian benchmark, when you pay, and how each model behaves when the scope changes.

CTN Interior Solutions has designed and built offices in Malaysia since 2001. Every figure below comes from a public source or is marked as modelled.

The short video below, from a US business coach for interior designers, compares hourly, flat-fee and per-square-foot pricing from the designer’s side.

1. What Does an Office Interior Design Service Fee Pay For?

Quick Answer: The design fee pays for the thinking and the paperwork: brief, space plan, design concept, finishes, construction drawings, tender documents and, often, site inspections. It does not pay for the building works, furniture or equipment. Those are separate costs, even when one firm provides both and shows them on one quote.

A full office interior design service usually runs through five stages:

• Brief and space plan: headcount, ways of working and a layout that fits them, often tested first as a test-fit before you sign the lease.
• Design concept: look, finishes and furniture direction, with an early budget.
• Detailed design: ceilings, power, data, air-conditioning and fire services coordinated.
• Drawings and tender: construction drawings, specifications and the documents builders price from.
• Site stage: inspections, payment checks and the defects list.

A fee covering only the first two stages is a concept fee, not a full design fee. Check this first when two quotes look far apart. Our complete guide to office interior design in Malaysia walks through these stages in project order.

2. Lump Sum, Percentage, Per Sq Ft or Hourly: How Do They Compare?

Quick Answer: A lump sum fixes the fee for a defined scope. A percentage ties the fee to the cost of the works. A per-square-foot rate ties it to floor area. Hourly billing ties it to time spent. Each one moves risk differently, so the right choice depends on how settled your brief and budget are.

Firms often mix models, such as a lump sum for design plus hourly rates for work outside the agreed scope.

The column that matters most is “What makes it go up”. A percentage fee grows when you add a glass meeting room. A lump sum does not, unless the room counts as a scope change. Ask each firm to write down what it treats as a change. Our list of questions to ask an office interior designer covers this.

3. Is There an Official Minimum Fee for Interior Design in Malaysia?

Quick Answer: Yes, for architect practices. The Architects (Scale of Minimum Fees) Rules 2010 set a minimum of 10% of the total cost of works for interior design services provided by an architectural consultancy practice. It is written for architect practices, but it is the clearest official benchmark Malaysia has for an office design fee.

The Rules, made under the Architects Act 1967 and published by the Board of Architects Malaysia (LAM), set out several points that apply directly to an office project:

• 10% minimum for interior design: covering layouts, drawings, tender documents, site supervision and payment certificates.
• Cost of works defined: the final cost including variations, or the accepted tender or estimate.
• Higher fees allowed: where justified by expertise or standing, with the client’s prior agreement.
• Time-based fees for extra services: time cost times a multiplier, or a lump sum built from it.
• Expenses and tax on top: printing and travel are reimbursable, and any service tax is charged to the client.

So 10% is a floor for architect practices, not a market price for every designer. And because it applies to the works, agree in writing whether furniture sits inside the base.

4. When Do You Pay an Office Design Fee?

Quick Answer: Under the LAM Rules, the fee is paid phase by phase. You pay 15% after schematic design, 30% after design development, 25% after contract documents, 25% during the site stage and 5% at completion. On a modelled RM1.62 million office fit-out, that is about RM162,000 spread across the project.

The chart shows that 70% of the fee is earned before any builder starts. That is fair, since most design effort happens on paper, but it means stopping after tender leaves most of the fee due.

If a practice is hired only for the site stage and completion, its fee for those phases rises by 30%. Our week-by-week office fit-out timeline shows how long each phase usually takes.

5. Which Fee Model Costs Less for Your Office?

Quick Answer: It depends on your finish level. A flat rate per square foot costs the same whatever you build, so it is a large share of a basic fit-out and a small share of a high-end one. A percentage fee does the opposite. On a 5,000 sq ft Kuala Lumpur office, the gap can exceed RM80,000.

At the basic tier, a RM30 per sq ft fee equals 12.3% of the works; at the advanced tier, 6.2%. So a per-square-foot fee suits premium offices, while a percentage suits simple finishes.

Changes during the project matter too. Suppose variations add 15% to a RM1.62 million collaborative fit-out:

For the build side of these numbers, see our office interior design pricing tiers in Malaysia and where an office renovation budget goes.

6. How Is an Hourly Design Fee Worked Out?

Quick Answer: Under the LAM Rules, time cost is annual salary divided by 1,800 working hours, times the hours spent, times a multiplier. The multiplier is 3.0 for a director, 2.4 for a professional, 2.2 for a sub-professional and 2.0 for admin or technical staff. The multiplier covers overheads, idle time and profit.

This is why hourly bills surprise people: one director hour costs as much as five junior designer hours.

Hourly fees suit a lease review, a short office design consultancy engagement or advice before you commit to a full design. To keep them under control:

• Ask for a cap: a not-to-exceed figure that needs your approval to pass.
• Ask for monthly time sheets: hours by person and task.
• Agree who attends: name the people needed at each meeting.

7. Is the Design Fee Free in Design and Build?

Quick Answer: Not really. In design and build, one firm designs and builds under one contract, so the design cost usually sits inside the build price rather than on its own line. Industry data puts professional services at about 7% of a typical fit-out budget, so the cost is real even when it is not shown.

According to JLL’s Asia Pacific Office Fit-Out Cost Guide 2026, professional services such as design and project management make up about 7% of a typical fit-out budget. On a RM1.62 million project, that would be around RM113,400, whether it is shown as a separate fee or not.

“Free design” can still be a good deal. A firm that designs what it builds can price as it draws, so the design is less likely to overshoot the budget. The trade-offs:

Ask a design-and-build firm two things: what you pay for the design if you do not go ahead, and who owns the drawings. Our guides to workplace design and build and what a one-stop renovation really bundles explain the model in full.

8. How Do You Compare Office Interior Design Service Proposals?

Quick Answer: Send each firm the same brief and ask for the fee split by stage. Confirm what the fee is calculated on, define what counts as a change, link payments to deliverables and agree who owns the drawings. Then compare totals. Most owners can do this in a few days with a simple table.

1. Write one brief: Give every firm the same headcount, floor plan, landlord fit-out guide and target move-in date.
2. Ask for the stages covered: Request the fee split by stage, from brief to final completion, so you can see what is missing.
3. Name the fee base: For a percentage, confirm whether it applies to building works only or to works plus furniture and equipment.
4. Define a change: Ask how many revisions are included and what rate applies after that.
5. Check payments and expenses: Link payments to deliverables and ask which expenses and taxes sit on top of the fee.
6. Confirm drawing ownership: Agree who may use the drawings if you change builder or stop the project.

A clear office design brief makes every proposal answer the same question. Landlord and authority submissions can sit inside or outside the fee; our guide to office authority submissions in Malaysia explains what is needed.

9. Conclusion: Choose the Fee Model That Fits Your Brief

Quick Answer: No fee model is right for every office. A lump sum suits a clear brief, a percentage suits an evolving scope, a per-square-foot rate suits premium finishes, and hourly suits short advice. Whichever you choose, get the stages, the base and the change rules in writing.

The fee is a small part of the budget, but a designer paid to finish the drawings and watch the site protects the much larger build spend.

10. Frequently Asked Questions

1. How much does an office interior design service cost in Malaysia?

There is no single rate. The Architects (Scale of Minimum Fees) Rules 2010 set a 10% minimum of the works cost for interior design by architect practices. Other firms charge lump sums, rates per square foot or hourly fees.

2. Is a percentage design fee better than a lump sum?

A percentage suits a changing scope. A lump sum gives more certainty when the brief is settled.

3. Do interior designers charge a fee on furniture?

Some do. Ask whether a percentage fee applies to building works only or to furniture as well.

4. When should I pay the design fee?

In stages linked to deliverables. The LAM Rules use 15% after schematic design, 30% after design development, 25% after contract documents, 25% during the site stage and 5% at completion.

5. Is design really free with design and build?

The design cost is usually built into the contract price. Ask what you would pay if you do not proceed, and who owns the drawings.