You’re about to lease office space and need a quick answer: How many square feet do we actually need for our team size?
The short answer: 150–250 sq ft per employee is the industry standard. But that range is wide, and your actual number depends on your work style, growth plans, and building type.
This guide gives you the quick formula and the four variables that shift your number. You’ll know exactly how much space to target before you talk to a broker or landlord.
Understanding Office Building Classes: Why Class A Matters for Your Phoenix Lease
The Baseline: IFMA Standard
The International Facility Management Association (IFMA) published the industry standard:
150–250 square feet per employee for modern office environments.
That translates to:
| Headcount | Low Range (150 sf) | High Range (250 sf) | Mid-Range (200 sf) |
|---|---|---|---|
| 5 people | 750 sq ft | 1,250 sq ft | 1,000 sq ft |
| 10 people | 1,500 sq ft | 2,500 sq ft | 2,000 sq ft |
| 20 people | 3,000 sq ft | 5,000 sq ft | 4,000 sq ft |
| 35 people | 5,250 sq ft | 8,750 sq ft | 7,000 sq ft |
| 50 people | 7,500 sq ft | 12,500 sq ft | 10,000 sq ft |
Most companies land in the 180–220 range, depending on layout and collaboration needs.
The Four Variables That Shift Your Number
Pick a starting point from the table above, then adjust using these four factors:
1. Your Office Layout
What type of work happens at desks?
Open floor plan (software, startups, creative teams):
- Lots of collaboration, brainstorming, standing desks
- Minimal or no private offices
- Use 150–170 sf/person
Mixed offices (professional services, corporate):
- Balance of private offices and open areas
- Formal meeting rooms, client-facing spaces
- Use 190–220 sf/person
Private office heavy (law firms, accounting, executive):
- Most staff have private or semi-private offices
- Formal meeting spaces and large conference rooms
- Use 220–250 sf/person
2. Your Hybrid Work Model
Are people in the office every day or intermittently?
5 days/week in-office (traditional):
- You need a seat for every person
- Use the baseline (150–250 sf)
3 days/week in-office (hybrid model):
- On peak days, 60–70% of your team is present
- You could theoretically use fewer desks
- But you still need all chairs on those peak days
- Reduce by 10% only if you’re comfortable with hot-desking
- Use 140–210 sf/person
2 days/week in-office:
- Even less desktop density needed
- But you need more collaborative/meeting spaces (people come in to collaborate, not focus)
- Use 130–180 sf/person
3. Your Growth Projection Over the Lease Term
Are you stable, growing slowly, or expanding rapidly?
No growth (headcount stable 3–5 years):
- Don’t add buffer
- Use the baseline
Slow growth (5–10% per year):
- Add 5–10% space buffer
- A 20-person team projecting to 22–23 people in Year 3 should size for 22, not 20
- Add 5–10% to your baseline
Moderate growth (10–25% per year):
- Add 15–20% buffer
- A 20-person team projecting to 25–26 people should size for 27–28
- Add 15–20% to your baseline
Rapid growth (25%+ per year):
- Add 20–30% buffer or plan for expansion rights
- A 20-person team projecting 30+ in 2 years should size for 32–35 or negotiate expansion options
- Add 20–30% or build expansion clause into lease
4. The Type of Building You’re Leasing
This affects usable space calculations.
Class A new buildings:
- Designed for modern density (open, efficient layouts)
- 80%+ usable space ratio
- Modern elevator, HVAC, common areas
- Plan 150–180 sf/person (efficient)
Class B standard buildings:
- 75–80% usable space (older elevator banks, hallways, mechanical rooms)
- You lose 20–25% of gross space to building circulation
- Plan 180–210 sf/person (less efficient density)
Class C older buildings:
- 70–75% usable space (more hallway, older layouts)
- Mechanical constraints may limit open floor plans
- Plan 200–240 sf/person
Why it matters: A 4,000 sq ft gross space in a Class A building might net you 3,200 usable sq ft. The same square footage in a Class C building might net 2,800 usable sq ft due to older infrastructure.
Quick Calculation: Your Number
Step 1: Pick your baseline from the table (150–250 based on layout)
Step 2: Adjust for hybrid model (if applicable)
Step 3: Add growth buffer
Step 4: Confirm it works with building type
Example: 15-person SaaS company
- Layout: Open floor plan (collaborative) → 160 sf baseline
- Hybrid: 3 days in-office → reduce to 150 sf
- Growth: Projecting 20 people in 2 years → add 15% → 150 × 1.15 = 172 sf
- Building type: Class A (efficient) → fine at 172 sf
- Target: 15 people × 172 sf = 2,580 sq ft
- Round up: Lease 2,700 sq ft to account for 20% + buffer for unexpected growth
Southeast Valley Context: Regional Variations
Office space per employee expectations vary slightly by Phoenix submarket.
Chandler & Gilbert (Class A Heavy)
Class A buildings in Chandler Riverbend and Gilbert Spectrum are designed for modern density. Companies here often run tight: 160–190 sf/person is normal because the buildings enable it.
Tenant expectations: Modern, efficient, collaborative spaces. Class A justifies density.
If you’re in Chandler/Gilbert: Don’t assume you need 220 sf/person. Modern buildings there are engineered for 160+.
Tempe (Mixed ASU-Adjacent)
Tempe has both older buildings (Class B/C, less efficient, 200–220 sf/person) and newer developments (Class A, 160–180 sf/person).
Tenant base: Younger (ASU proximity), tech-leaning, more collaborative
If you’re in Tempe: Ask your broker whether the building is “modern layout optimized for density” (Class A) or “traditional with private offices” (Class B). Density assumptions differ.
Mesa (Class B/C Dominated)
Older office parks designed for 1990s–2000s standards (more private offices, less open collaboration). Companies here typically use 190–220 sf/person because the buildings have smaller, more compartmentalized spaces.
Tenant base: More traditional (professional services, medical, government-adjacent), stable headcount
If you’re in Mesa: Even if you have an open-plan culture, older buildings may not support it without renovation. Expect to use more space per person due to building constraints.
FAQ: Space Per Employee
Q: We’re a software company and want to be really collaborative. Can we get away with 130 sf/person?
Not sustainably. 130 sf/person is 1,300 sq ft for 10 people—essentially open floor with zero private phone booths, zero break room, zero quiet focus space. It works for a coworking space (shared amenities, turnover expected) but feels cramped in a private lease. Aim for 150–160 minimum.
Q: We’re expanding from 10 to 30 people in 2 years. Should we size for 30 now?
Size for 25–28. You want to fill the space over 18–24 months, not sit in 30% empty offices while you hire. Overbuilding early signals weakness to your team and wastes money. Negotiate expansion rights for the last 2,000 sq ft if growth accelerates.
Q: Our current space feels crowded at 200 sf/person. Should we target 250?
Maybe. But first, diagnose the crowding. Is it:
- Not enough desks? (Density problem → you’re above 200 sf)
- Not enough conference rooms? (Layout problem → add meeting space without adding gross square footage)
- Not enough break room? (Amenities problem → you miscalculated amenity space)
- Parking nightmare? (This is unrelated to square footage per person)
Crowding often isn’t a per-person space problem; it’s a layout or amenities problem. Work through it before you assume you need more gross space.
Q: We’re hybrid (3 days in-office). Can we use 120 sf/person?
Not as a desktop density metric. You still need a chair for every person on those 3 days. But you can use hot-desking (fewer desks than people) if your culture supports it. That’s a cultural choice, not a square footage calculation. Most companies with hybrid models use 150–180 sf/person and accept that desks aren’t fully utilized 5 days/week.
Q: What if our work is very focus-heavy (engineering, accounting)? Do we need more space?
Yes, slightly. Focus work benefits from quieter environments, which typically means private offices or high-backed focus pods. These take more space than open desks. If your company is 70% focus work, lean toward the 200–220 sf/person range instead of 150–170. But it’s more about layout than absolute square footage.
Q: Should we plan space for contractors or remote workers who occasionally come in?
No. Don’t size for people who aren’t in the office regularly. If you have 15 full-time in-office staff and 5 remote contractors who visit quarterly, size for 15 people. If you want hot-desking for the contractors, add 1–2 shared touchdown desks (takes negligible space).
Real Example Calculations
Example 1: 22-person marketing agency, Chandler, Class A
- Current: 22 people
- Growth: To 26 people by Year 3
- Layout: Open, collaborative culture
- Hybrid: 4 days in-office
- Building type: Class A (modern, efficient)
Calculation:
- Baseline for open layout: 165 sf/person
- Hybrid adjustment (4 days): minimal change → 165 sf
- Growth to 26 people: add 15% → 165 × 1.15 = 190 sf
- Class A efficiency: 190 sf is appropriate
- 22 people × 190 sf = 4,180 sq ft
- Target: 4,200 sq ft (rounding for even lot sizes)
Example 2: 35-person accounting firm, Gilbert, Class B
- Current: 35 people (20 accountants, 15 admin/support)
- Growth: Stable, no growth planned
- Layout: Mixed offices (partners have offices, staff in semi-open)
- Hybrid: 5 days in-office (traditional, client-facing culture)
- Building type: Class B (1990s–2000s construction, older layouts)
Calculation:
- Baseline for mixed offices: 200 sf/person
- Hybrid adjustment: none (5 days = full occupancy)
- Growth buffer: none (stable)
- Class B efficiency: 200 sf is standard for this building type
- 35 people × 200 sf = 7,000 sq ft
- Target: 7,000–7,200 sq ft
Example 3: 8-person startup, Tempe, hybrid, unsure if Class A available
- Current: 8 people (all technical and product)
- Growth: Aggressive (targeting 15 people in 2 years)
- Layout: Very open, collaborative (standup desks, shared tables)
- Hybrid: 2 days in-office (focus-friendly, collaboration-focused)
- Building type: Unknown (could be Class A or B depending on what’s available)
Calculation if Class A:
- Baseline: 150 sf/person (open, collaborative)
- Hybrid adjustment (2 days): reduce to 140 sf (accept hot-desking)
- Growth to 15 people: add 25% → 140 × 1.25 = 175 sf
- 8 people × 175 sf = 1,400 sq ft, growing into ~1,500 sq ft by Year 2
- Target: 1,500 sq ft in Class A, may feel spacious initially but fills with growth
Calculation if Class B available:
- Baseline: 180 sf/person (Class B less efficient)
- Hybrid adjustment: reduce to 170 sf
- Growth: add 25% → 170 × 1.25 = 212 sf
- 8 people × 212 sf = 1,700 sq ft
- Target: 1,700 sq ft in Class B
Note: Class A option is 200 sq ft smaller, costs more per sq ft, but is more efficient and flexible for growth. Class B option is larger, costs less, but older layouts may constrain collaboration.
Your Next Step: From Calculation to Broker Conversation
You now know your target range. When you talk to a tenant rep or broker:
- Share your target square footage (e.g., “We’re looking for 4,000–4,500 sq ft”)
- Mention your growth expectations (“We’re targeting this for 2–3 years and might need more after”)
- Flag your layout preference (“We’re collaborative/focused/mixed”)
- Ask about building type efficiency (“This space is efficient for this square footage, right?” — Good brokers know the per-person density of every building)
A good broker will validate your number against their experience. If they say “That’s tight for 22 people,” you now have language to push back. If they say “You might want 4,500 instead of 4,000,” listen—they know the market.
Next step: Learn how to choose the right tenant rep broker to run this analysis with you.
Book your FREE consultation here.
Learn about subscription rentals here.
