A business shortlists two office spaces in Gurugram.
Space A is 8,000 sq ft at ₹80 per sq ft per month. Space B is 7,000 sq ft at ₹90 per sq ft per month.
On the surface, Space A looks cheaper — lower rate and more area. Most businesses would shortlist it first.
But Space A has a floor plate efficiency of 68%. Space B has a floor plate efficiency of 84%. Once the common areas, structural core, and unusable zones are accounted for, Space A delivers 5,440 usable sq ft, and Space B delivers 5,880 usable sq ft.
The rent per usable sq ft: ₹117.6 for Space A versus ₹107.1 for Space B.
Space B — the one that appeared more expensive — is actually cheaper on every meaningful metric. More usable space. Lower effective rent per sq ft of space the business can actually use. More workstations for the same monthly cost.
This reversal happens in real office transactions every week across Delhi NCR, Bengaluru, Mumbai, and Pune — because most businesses compare spaces on rentable area and base rent, which are the numbers the landlord quotes and the broker presents. Almost no one compares on usable area and real cost per desk, which are the numbers that actually determine value.
Understanding this difference is not a technical nicety. It is the foundation of an honest office cost comparison — and the starting point for knowing whether the office the business chose is genuinely the best available option at its budget.
1. The Core Concepts — What Each Term Actually Means
The terminology in Indian commercial real estate around area measurements is imprecise and inconsistently applied — which is one of the reasons the rentable versus usable comparison is so frequently skipped.
Usable Area: The actual working area available to the tenant — the space where desks, meeting rooms, cabins, and operational zones can be placed. In Indian commercial leasing, this is closest in concept to carpet area in residential real estate — the area within the four walls of the leased premises, excluding the building’s structural elements and common spaces.
Usable area is the only area the tenant experiences as space. Everything else is infrastructure that surrounds and supports the usable area but is not available for the tenant’s use.
Rentable Area: The area on which rent is calculated. In most Indian commercial leases, this is the super built-up area — which includes the tenant’s usable area plus their proportionate share of the building’s common areas: lobbies, corridors, lift shafts, stairwells, toilets, generator rooms, building management offices, and any other shared infrastructure.
The difference between rentable area and usable area is the load factor — the percentage of rentable area that is common infrastructure rather than usable space.
Load Factor (also called Loss Factor or Common Area Factor): The percentage by which the rentable area exceeds the usable area. A load factor of 25% means that for every 100 sq ft of rentable area the tenant pays for, 75 sq ft is usable space and 25 sq ft is common area.
| Rentable area | Load factor | Usable area |
| 10,000 sq ft | 20% load | 8,000 sq ft |
| 10,000 sq ft | 25% load | 7,500 sq ft |
| 10,000 sq ft | 30% load | 7,000 sq ft |
| 10,000 sq ft | 35% load | 6,500 sq ft |
| 10,000 sq ft | 40% load | 6,000 sq ft |
The difference between a 20% load and a 40% load on a 10,000 sq ft office is 2,000 sq ft of usable space — the equivalent of approximately 25 to 30 workstations. On a five-year lease at ₹80 per sq ft per month, the business with 40% load factor pays the same rent as the business with 20% load factor — but receives 20% less space to actually use.
2. The Indian Context — How This Plays Out in Practice
In Indian commercial real estate, the rentable area concept is well-established — but the transparency around what is included, and what the resulting load factor is, varies enormously by building type, developer, and market.
In RERA-registered residential projects: RERA mandated carpet area disclosure — a significant transparency improvement for residential buyers. But RERA’s mandate applies to residential projects, not to commercial leases. Commercial office leases have no equivalent mandatory disclosure requirement for usable area.
In Grade A commercial buildings with institutional management: Most professionally managed Grade A buildings in Gurugram’s Cyber City, Golf Course Road, Noida Expressway, and Aerocity provide a floor efficiency ratio — the percentage of the floor plate that is usable — as part of their leasing documentation. This allows tenants to calculate usable area from the rentable area.
Typical load factors in Grade A Indian commercial buildings:
| Building type | Typical load factor | Usable area as % of rentable |
| Modern Grade A high-rise, large floor plates | 18–22% | 78–82% |
| Standard Grade A commercial — mid-rise | 22–28% | 72–78% |
| Older Grade B commercial building | 28–35% | 65–72% |
| Converted or irregular building | 35–45%+ | 55–65% |
| IT park — large campus floor | 15–20% | 80–85% |
Why load factors vary so much:
The load factor is a function of building design decisions — the size of the lobby, the number of lifts and lift shafts, the corridor width, the location and size of the structural core, and the overall shape of the floor plate.
A building with a grand double-height atrium lobby, four lifts, wide corridors, and a central structural core has a high load factor — and a tenant paying for that load factor is paying for the building’s design ambition, not for their own usable space.
A building with a functional single-height lobby, two lifts, standard corridors, and an efficient structural core has a lower load factor — and the tenant retains more of the rentable area as usable space.
Neither building is wrong. But they deliver different amounts of usable space per rupee of rent — and that difference must be understood before comparing options.
3. Floor Plate Efficiency — The Related Concept That Goes Deeper
Load factor measures the ratio of usable to rentable area at the building level — how much of the total floor is consumed by common infrastructure.
Floor plate efficiency goes deeper — it measures how usable the specific floor configuration is for office planning. Two floors can have the same load factor but very different floor plate efficiencies depending on:
Column grid and spacing: A floor plate with columns on a 12-metre grid allows for efficient straight-run racking of workstations with clear aisles. A floor plate with columns on a 7-metre grid fragments the usable area, creates obstacles in workstation layouts, and effectively reduces the number of desks that can be placed in the space.
Floor plate shape: A rectangular floor plate maximises usable efficiency — walls are straight, racking is straightforward, and corners are usable. An L-shaped, triangular, or heavily stepped floor plate creates zones that are difficult to plan, corridors that consume space without delivering desk positions, and corners that end up as waste area.
Natural light depth: A floor plate where the working area extends more than 10 to 12 metres from the nearest window will require full artificial lighting throughout — which does not affect the efficiency calculation but affects the quality of the working environment and the electricity cost.
Core position: A central core — where lifts, toilets, and stairwells are positioned in the middle of the floor plate — creates a dead zone in the centre that forces all workstations to the perimeter. A peripheral or compact core leaves the centre of the floor plate available for high-density workstation planning.
The practical implication:
Two floors with identical load factors — both delivering 75% of rentable area as usable area — can have very different real workstation capacities depending on the column grid, floor plate shape, and core position. A floor that is geometrically efficient can accommodate 25% more workstations than one with the same total usable area but a poor configuration.
The only way to assess floor plate efficiency accurately is to request the floor plan and apply the business’s actual space planning standard — not to rely on the landlord’s or broker’s estimate of how many people the space can accommodate.
4. Space Planning Standards — The Density Assumption Behind the Calculation
Every cost-per-desk calculation requires a space planning standard — an assumption about how much usable area is allocated per workstation, once all office functions are accounted for.
This is where many businesses get the calculation wrong — by using a simplified assumption (one desk = X sq ft) that does not account for the full range of space functions in a real office.
The components of a real office’s usable area:
| Function | Typical allocation |
| Workstations | 6–8 sq ft per person (just the desk and chair) |
| Circulation space around workstations | 4–6 sq ft per person |
| Meeting rooms | Typically 10–12% of total usable area |
| Reception and waiting | Typically 3–5% of usable area |
| Server room or IT room | 50–200 sq ft depending on requirement |
| Pantry and breakout | Typically 5–8% of usable area |
| Storage | Typically 3–5% of usable area |
| Columns and unusable zones | 5–10% depending on floor plate |
The resulting net workstation area per person:
Once all non-workstation functions are accounted for, the effective usable area per person — across the whole office — typically runs:
- Open plan, high density: 60–80 sq ft of usable area per person
- Standard open plan with reasonable meeting room provision: 80–100 sq ft of usable area per person
- Mixed open plan and private offices: 100–130 sq ft of usable area per person
- Primarily private offices: 130–180 sq ft of usable area per person
A business that assumes 80 sq ft of usable area per person — and has a floor with 6,000 sq ft of usable area — can accommodate approximately 75 people. A business that uses 100 sq ft per person accommodates 60.
The right planning standard depends on the business’s actual working model — how many people are in the office simultaneously on a typical day, how many meeting rooms the business genuinely needs, and what the operational functions of the space are.
5. The Real Cost Per Desk Calculation — Step by Step
This is the calculation that transforms a base rent comparison into a genuine value comparison — the number that tells the business what each workstation actually costs per month, fully loaded.
The formula:
Real cost per desk per month = Total monthly occupancy cost ÷ Number of usable workstations
Where:
- Total monthly occupancy cost = Base rent + CAM + GST + electricity + parking + internet + housekeeping
- Number of usable workstations = Usable area ÷ usable area per workstation (including all space functions)
A worked example comparing two Gurugram offices:
Both spaces are being considered for a 60-person team.
Space A — 8,000 sq ft rentable area, Golf Course Road:
| Item | Value |
| Rentable area | 8,000 sq ft |
| Load factor | 32% |
| Usable area | 5,440 sq ft |
| Floor plate shape | Irregular — column positions reduce effective planning area |
| Effective planning area | *4,900 sq ft (after column adjustments) |
| Space planning standard | 80 sq ft per person |
| Workstations supportable | 61 people |
| Cost component | Monthly |
| *Base rent at ₹80 per sq ft (on 8,000 sq ft) | ₹6,40,000 |
| CAM at ₹25 per sq ft | ₹2,00,000 |
| GST at 18% | ₹1,51,200 |
| Electricity (60 people) | ₹70,000 |
| Parking — 20 slots at ₹8,000 | ₹1,60,000 |
| Internet | ₹20,000 |
| Housekeeping | ₹22,000 |
| Total monthly cost | ₹12,63,200 |
Real cost per desk: ₹12,63,200 ÷ 61 = ₹20,708 per desk per month
Space B — 7,000 sq ft rentable area, Golf Course Road:
| Item | Value |
| Rentable area | 7,000 sq ft |
| Load factor | 22% |
| Usable area | 5,460 sq ft |
| Floor plate shape | Rectangular — efficient column grid, central core |
| Effective planning area | 5,200 sq ft |
| Space planning standard | 80 sq ft per person |
| Workstations supportable | 65 people |
| Cost component | Monthly |
| *Base rent at ₹90 per sq ft (on 7,000 sq ft) | ₹6,30,000 |
| CAM at ₹20 per sq ft | ₹1,40,000 |
| GST at 18% | ₹1,38,600 |
| Electricity (65 people) | ₹75,000 |
| Parking — 18 slots at ₹8,000 | ₹1,44,000 |
| Internet | ₹20,000 |
| Housekeeping | ₹20,000 |
| Total monthly cost | ₹11,67,600 |
Real cost per desk: ₹11,67,600 ÷ 65 = ₹17,963 per desk per month
The comparison:
| Metric | Space A | Space B | Difference |
| Quoted rent per sq ft | ₹80 | ₹90 | Space A appears ₹10 cheaper |
| Total monthly cost | ₹12,63,200 | ₹11,67,600 | Space B is ₹95,600 cheaper |
| Workstations supported | 61 | 65 | Space B fits 4 more people |
| Real cost per desk | ₹20,708 | ₹17,963 | Space B is ₹2,745 cheaper per desk |
| *Annual saving (65 desks) | — | — | ₹21,39,060 per year |
Space A, which appeared cheaper at ₹80 per sq ft against ₹90 per sq ft, is actually ₹2,745 more expensive per desk per month — a difference of ₹21.4 lakh per year on the same 60-person team.
Over a five-year lease, the business that chose Space A based on the headline rent comparison paid ₹1.07 crore more than if they had chosen Space B — with fewer workstations for the entire five years.
6. The Common Mistakes in Area and Cost Comparisons
These are the errors that produce the kind of miscalculation shown above — and they occur in most commercial shortlisting processes that are not conducted with explicit attention to usable area and real cost per desk.
Mistake 1 — Comparing on rentable area without asking for usable area: The rentable area is what the landlord quotes. The usable area is what the business gets. These are not the same number, and the difference — 20 to 40% — is significant enough to reverse an apparent cost comparison.
The fix: Ask every landlord or broker for the floor efficiency ratio or the usable area of the specific floor being shortlisted — in writing. If they cannot provide it, request the floor plan and measure it.
Mistake 2 — Using the landlord’s headcount estimate: “This floor can accommodate 80 people” — a claim made by every landlord or broker about every floor, regardless of the actual usable area and the relevant space planning standard. This estimate is almost always optimistic.
The fix: Apply the business’s own space planning standard to the actual usable area — accounting for meeting rooms, reception, server room, pantry, and circulation, not just raw desk positions.
Mistake 3 — Not accounting for columns and unusable zones in the efficiency calculation: A floor plan may show 5,500 sq ft of usable area. But if the column grid is tight or the floor plate shape creates awkward zones, the actual effective planning area — the area that can be efficiently fitted with workstations and functions — may be 4,800 sq ft.
The fix: Request the structural floor plan — not just the architectural plan — to identify column positions. Apply a 10 to 15% reduction for column zones and unusable corners on older or irregularly shaped buildings.
Mistake 4 — Comparing total monthly cost across spaces of different sizes without normalising per desk: A business comparing ₹9 lakh per month for Space A against ₹11 lakh per month for Space B is not making a useful comparison if Space A accommodates 50 people and Space B accommodates 80 people.
The fix: Always calculate cost per desk per month as the normalised comparison metric — not total monthly cost.
Mistake 5 — Forgetting fit-out amortisation in the per-desk calculation: The fit-out investment is a cost of the tenancy — it must be amortised across the lease period and included in the monthly cost per desk. A ₹60 lakh fit-out on a five-year lease adds ₹1 lakh per month to the real occupancy cost. Excluding it produces an understated per-desk figure.
The fix: Divide the estimated fit-out cost by the number of months in the lease and add it to the monthly occupancy cost before calculating per-desk cost.
7. Building the Full Per-Desk Cost Model — What to Include
For a complete, honest real cost per desk calculation, the model should include every cost the business incurs specifically because it has taken this office.
Monthly operating costs to include:
- Base rent (on rentable area)
- CAM charges (with breakdown confirmed in writing)
- GST at 18% on rent + CAM (if landlord is GST-registered)
- Electricity (metered separately — estimate based on headcount and equipment)
- Parking (number of slots × cost per slot)
- Internet (primary and backup ISP)
- Housekeeping (if outsourced — or the cost if handled by the building)
- Pantry consumables (coffee, water, basic supplies)
- After-hours HVAC (if the team regularly works beyond standard building hours)
One-time costs to amortise across the lease:
- Fit-out cost ÷ lease months = monthly amortisation
- Security deposit × opportunity cost (typically 10–12% per annum on the capital tied up) ÷ 12 = monthly opportunity cost
- Stamp duty ÷ lease months
The per-desk model (for a 60-person team, 5-year lease on Space B from the example above):
| Cost component | Monthly amount |
| Total monthly operating cost | ₹11,67,600 |
| Fit-out amortisation (₹70 lakh ÷ 60 months) | ₹1,16,667 |
| *Security deposit opportunity cost (₹35 lakh × 10% ÷ 12) | ₹29,167 |
| Stamp duty amortisation (₹6 lakh ÷ 60 months) | ₹10,000 |
| Total real monthly cost | ₹13,23,434 |
| Real cost per desk (65 workstations) | ₹20,360 per desk per month |
The real cost per desk — once fit-out, security deposit opportunity cost, and stamp duty are included — is ₹20,360, not ₹17,963. The difference is ₹2,397 per desk per month — or ₹18.6 lakh per year across 65 desks.
This is still less than Space A’s real cost per desk — but the complete model gives a different number from the partial model. A business that makes decisions on the partial model is systematically under-calculating its office cost.
8. The Hybrid Work Adjustment — Real Cost Per Desk for Businesses With Partial Attendance
The standard calculation above assumes the office is fully and consistently occupied — every desk in use every working day. For businesses with hybrid or flexible working models, the relevant metric is different.
If a 60-person team has an average daily attendance of 40 people — with 20 people working from home on any given day — the office does not need 60 dedicated desks. It needs approximately 45 to 50 desks (allowing for occasional full-attendance days) with a hot-desking or activity-based arrangement for the rest.
A 60-person team with 75% average attendance taking 5,000 sq ft of usable area — sized for 60 people at 80 sq ft per person — is paying for 15 desks that are empty on most days.
The hybrid-adjusted per-desk calculation:
Instead of cost per desk provided, calculate cost per desk actually occupied on an average day:
If the office provides 60 desks and average daily attendance is 40 people: Real cost per occupied desk = Total monthly cost ÷ 40 = ₹13,23,434 ÷ 40 = ₹33,086 per occupied desk per month
This number — the cost per desk actually in use — is the metric that determines whether the office size is right-sized for the business’s working model. A cost per occupied desk of ₹33,000 versus the ₹20,000 per provided desk represents a 40% inefficiency — driven entirely by 15 desks that are consistently empty.
The right-sizing solution: take 4,000 sq ft (sized for 50 desks rather than 60) with a hot-desking arrangement — reducing the monthly cost while maintaining the capacity for full-attendance days through shared desk booking.
9. How to Request the Information You Need — What to Ask and How
Most commercial landlords and brokers in India do not proactively provide usable area, floor efficiency ratios, or per-desk calculations. The burden of requesting this information is on the tenant — and knowing exactly what to ask, and how to ask it, determines whether the information is provided.
The questions to ask for every shortlisted property:
“What is the floor efficiency ratio for this specific floor — and can you provide it in writing?”
If the building management cannot provide a floor efficiency ratio, request the floor plan — both the architectural drawing and the structural drawing showing column positions. From this, usable area can be estimated.
“What is the usable area of this specific floor — excluding the structural core, common area corridors, and building-side toilets?”
If the landlord states a usable area, ask for it in the LOI or in a letter from the building management — not just verbally. Verbal estimates of usable area are frequently optimistic.
“What is the column grid on this floor — what is the spacing between structural columns?”
Column spacing affects the efficiency of workstation planning. A 12-metre grid is efficient. An 8-metre grid creates more planning constraints.
“Has a space planner or workplace consultant done a test-fit for this floor — and can you share it?”
Many Grade A commercial buildings commission test-fit drawings — showing how many workstations can be placed on a floor at a standard space planning density — as part of their leasing marketing. If available, this is more reliable than a verbal headcount estimate.
“What is the rentable area on which rent is calculated — and is it the super built-up area, built-up area, or carpet area?”
This confirms the area basis for rent calculation and allows the load factor to be calculated from the usable area.
10. How Brokers Should Use This Framework — The Advisory Standard
The rentable versus usable area analysis — and the real cost per desk calculation — is the foundation of honest commercial office advisory. A broker who provides this analysis before the client visits a single property is providing information that most clients cannot generate themselves and that most brokers do not provide.
What a value-adding commercial broker does with this framework:
At the shortlisting stage: Before presenting any options, the broker should have collected the floor efficiency ratio (or usable area) for every property on the shortlist and calculated the total monthly occupancy cost and real cost per desk for each one.
When presenting options, the comparison should be presented as:
“Space A — 8,000 sq ft rentable, 32% load factor, 5,440 sq ft usable, 61 workstations at your space planning standard, real cost per desk ₹20,708 per month.”
“Space B — 7,000 sq ft rentable, 22% load factor, 5,460 sq ft usable, 65 workstations at your space planning standard, real cost per desk ₹17,963 per month.”
“At your 60-person headcount, Space B gives you more workstations at a lower real cost per desk — despite a higher base rent per sq ft. I would recommend starting the shortlist with Space B.”
This is advisory. It changes the client’s decision. And it demonstrates knowledge that no portal and no other broker provided.
At the site visit stage: Walk the floor plate with the client and assess the column grid, the floor shape, and the core position. Make an independent assessment of whether the landlord’s or broker’s stated usable area and workstation capacity are realistic — and flag any material discrepancy.
At the negotiation stage: If the load factor is high — above 30% for a building that is otherwise suitable — the higher load can be used as a negotiating point: “The effective rent per usable sq ft here is ₹X — which is higher than comparable buildings at lower load factors. There is a basis to negotiate the base rent downward to reflect this.”
A tenant whose broker understands this argument — and makes it — negotiates from a position of analytical strength, not just commercial instinct.
11. A Quick Reference Calculation Sheet
Brokers can use this framework for every commercial office shortlisting exercise.
Step 1 — Establish rentable area and load factor:
Rentable area = stated in lease / LOI Load factor = confirmed from building management or estimated from floor plan Usable area = rentable area × (1 − load factor)
Step 2 — Assess floor plate efficiency:
Apply 5–15% reduction to usable area for column zones and unusable spaces in irregular floor plates. Effective planning area = usable area × (1 − column zone adjustment)
Step 3 — Apply space planning standard:
Workstations supportable = effective planning area ÷ usable sq ft per person
Usable sq ft per person depends on working model:
- High density open plan: 70–80 sq ft per person
- Standard open plan: 80–100 sq ft per person
- Mixed cabins and open plan: 100–130 sq ft per person
Step 4 — Calculate total monthly occupancy cost:
Total monthly cost = base rent + CAM + GST + electricity + parking + internet + housekeeping + other
Step 5 — Calculate real cost per desk:
Real cost per desk = total monthly occupancy cost ÷ workstations supportable
Step 6 — Include amortised one-time costs for complete model:
Monthly fit-out amortisation = fit-out cost ÷ lease months Monthly deposit opportunity cost = security deposit × 10% ÷ 12 Complete monthly cost = total monthly + amortisations Complete cost per desk = complete monthly cost ÷ workstations supportable
Step 7 — Adjust for hybrid work if applicable:
Average daily attendance = team size × attendance rate Cost per occupied desk = complete monthly cost ÷ average daily attendance Compare this to right-sized space cost per occupied desk to assess whether the office is appropriately sized
What Brokers Who Use This Framework Do Differently
They do not compare offices on base rent per sq ft. They compare them on real cost per desk per month — the only metric that tells a business what the office genuinely costs relative to the value it delivers.
They know that a high load factor reduces the value of every rupee of rent the tenant pays. They know that an irregular floor plate with a tight column grid reduces the workstations that fit in a given usable area. They know that the landlord’s headcount estimate is almost always optimistic — and they apply the client’s actual space planning standard rather than accepting the estimate.
And they present this analysis before the first site visit — so the client’s shortlist is built on genuine value comparison, not headline rent comparison.
A client who receives this analysis — who sees clearly that the space appearing more expensive at ₹90 per sq ft is actually cheaper per desk than the space at ₹80 per sq ft — has been given information that changes their decision and saves them money for the full duration of the lease.
That is what honest commercial advisory looks like. And it is exactly what this calculation makes possible.