What it means
Space is one of the largest costs for many businesses, from offices and shops to warehouses and factories. Dividing a cost by the floor area turns it into a rate that can be compared across buildings of different sizes, locations and ages.
The figure is used in several ways. Landlords quote rents per square foot per year, builders quote construction costs per square foot, and facilities teams track running costs such as cleaning, heating and maintenance in the same way.
Where metric measures are used, one square metre is about 10.76 square feet. It is important to be clear about which area and which cost are being used.
Gross area includes walls, corridors and shared space, while net or usable area counts only the space tenants can actually use. A rent that looks cheap on gross area can be expensive on usable area.
Occupancy cost is usually wider than rent. Service charges, property taxes, insurance, utilities and maintenance can add a large amount, so a fair comparison between two buildings uses the total cost per square foot, not the headline rent alone.
Businesses also look at space per employee and cost per desk. If a company pays $45 per square foot but uses its offices only half the week, its real cost per useful square foot is far higher.
This is why many firms review their space needs whenever working patterns change, and before any lease renewal. For construction, cost per square foot is only a rough guide at the early planning stage.
Quality of finish, site conditions, local labour rates and building rules can move the final cost far from the average, so detailed estimates are needed before approval.
In practice
Real-world examples
Example 1
A retailer compares two shop units. Unit A rents at $60 per square foot with 1,500 square feet, and unit B at $45 per square foot with 2,200 square feet. Annual rent is $90,000 for unit A and $99,000 for unit B, so the larger unit costs only $9,000 more.
Example 2
A developer plans a small apartment block of 20,000 square feet and uses an average build cost of $210 per square foot. The rough budget of $4,200,000 is then refined with quotes from contractors.
Example 3
A logistics company pays $9 per square foot for warehouse space and $2 per square foot in running costs. When stock levels fall and a quarter of the warehouse stands empty, it renegotiates to give back that space and save money. On a 100,000 square foot building, returning 25,000 square feet saves 25,000 x $11 = $275,000 a year.
Think of it
Think of it like buying fruit at the supermarket. Instead of asking how much a whole bag of mixed apples costs, you look at the price per kilo to see which bag gives you more fruit for your money.
Formula
Calculation
Cost per square foot = total cost / floor area in square feet
A company leases an office of 6,000 square feet for $270,000 a year in rent. Rent per square foot = $270,000 / 6,000 = $45. Service charges and insurance add $30,000 a year, so the total occupancy cost is $270,000 + $30,000 = $300,000, which is $300,000 / 6,000 = $50 per square foot. With 50 employees, the space costs $300,000 / 50 = $6,000 per employee.Case study
Seen in the real world
Marlowe & Finch is an illustrative, fictional design studio that leased 8,000 square feet of office space at $55 per square foot, a total of $440,000 a year. After the team moved to a hybrid pattern, a desk survey showed that only about 35% of the space was used on a typical day.
The finance manager worked out that the effective cost of the used space was closer to $157 per square foot, calculated as $440,000 divided by 2,800 used square feet. She presented three options, downsizing, subletting or keeping the space.
The studio sublet a third of the floor for $120,000 a year, lowering its net cost to $320,000. In this illustrative case, the simple ratio showed that a seemingly reasonable rent concealed a lot of waste.
Watch out
Common mistakes
- Comparing rents on different area bases, such as gross against usable area, which makes one building look cheaper than it really is.
- Looking at headline rent only and ignoring service charges, taxes, utilities and maintenance.
- Relying on an average build cost per square foot for a final budget, when quality, location and site conditions can change it a great deal.
Questions
People also ask
Is a lower cost per square foot always better?
No, because a cheap building in a poor location or with too much unusable space can cost more in lost productivity or sales than it saves. Staff travel time and customer footfall belong in the comparison.
How do I convert square metres to square feet?
Multiply the number of square metres by about 10.76, so 100 square metres is roughly 1,076 square feet.
Is rent per year or per month?
Quotes differ by market, so always check whether a price per square foot is annual or monthly before comparing. A figure of $4 a month and one of $48 a year describe the same rent.