Start With People, Not Rooms
The question sounds like it should have a simple answer, and it nearly does — but only if you ask it in the right order. Square footage follows from how many people are in the office on a normal day, what each of them does, and how often outsiders come in. Work in that order and the number falls out. Work backwards from a listing you liked and you will either overbuy or discover in month three that there is nowhere to take a confidential call.
The Current Benchmarks
Space-planning standards have moved substantially since 2020. Before the shift to hybrid work, the common planning figure was around 225 square feet per employee. In 2026, organizations planning new space typically target 75 to 150 usable square feet per person, measured against peak in-office attendance rather than total headcount. Offices planned at average density — more private rooms, fewer open benches — commonly land in the 150 to 250 square feet per person range. For reference, the U.S. Department of Energy uses 180 usable square feet per person as its benchmark for administrative space.
Two cautions before you apply any of those figures.
First, those are usable square feet, not rentable. More on that below, because the gap between them is money.
Second, the low end of those ranges assumes a hybrid, largely open floor plan with shared desks. It does not describe a law firm where four attorneys each need a door that closes, or a counseling practice where every room has to be private. Professional service firms with private offices should plan toward the upper half of the range, not the lower.
Usable vs. Rentable: The Square Footage You Pay For but Cannot Stand In
Your lease is priced on rentable square feet. That includes your suite plus a proportional share of the building’s common areas — lobby, corridors, shared restrooms, mechanical rooms. The ratio between the two is the load factor (sometimes called the add-on factor or common area factor).
A 15% load factor on 1,000 usable square feet means you are billed for 1,150 rentable square feet. At $30 per square foot that is $4,500 a year — $375 a month — for hallway. Load factors in the Houston market commonly run from around 10% in simple low-rise buildings to the high teens or low twenties in towers with large lobbies and extensive common space.
This is not a scam; common areas are real and somebody has to pay for them. But it means two quotes at the same rate can deliver materially different amounts of actual office. Always ask for both numbers. If a landlord or broker will only give you rentable, ask for the load factor directly. The term is defined alongside the rest of the vocabulary in our commercial lease glossary.
Worked Examples
Solo practitioner, occasional client meetings
One private office of 120 to 180 square feet, plus access to a shared conference room when a client comes in. You do not need to lease a conference room you will use four times a month — you need access to one. That distinction alone saves a solo attorney or consultant several hundred dollars a month.
Two- to three-person professional firm
Roughly 400 to 700 usable square feet: two or three private offices, a small reception or waiting area, and shared conference access. If one of those people is a paralegal or assistant who fields walk-ins, put them nearest the door and budget a little more for that front space.
Four- to six-person firm
Roughly 800 to 1,400 usable square feet. At this size you start needing a dedicated space for the things that were previously improvised: files, the printer, someone’s lunch. A small dedicated conference room begins to earn its keep around here, particularly if client meetings are weekly rather than monthly.
Seven- to ten-person firm
Roughly 1,400 to 2,500 usable square feet, and this is the point where the plan matters more than the total. Ten people in 2,000 square feet is comfortable or miserable depending entirely on how many of them need a closed door and how the rooms are arranged. Walk the actual floor plate before you commit.
The Line Items People Forget
- Reception and waiting. If clients visit, they need somewhere to sit that is not the hallway. Budget 60 to 150 square feet depending on volume.
- Conference space. A six-person conference room needs roughly 200 to 300 square feet once you account for chairs pushed back and someone walking behind them. Shared conference access is usually the better economic answer for teams under about eight people.
- Storage and files. Still real, particularly in legal and accounting practices with retention obligations.
- Equipment. A production station, copier, and supplies need a footprint and a power drop.
- Breakroom. If the building has a shared kitchen, you do not need your own. If it does not, people will eat at their desks and you will smell it all afternoon.
- Growth. Plan for where you expect to be at the end of the lease term, not where you are on signing day — but do not lease three years of empty desks either. On a shorter or month-to-month term you can size for today and move when you outgrow it, which is one of the underrated arguments for flexible lease terms.
How to Pressure-Test Your Number Before You Sign
- Count desks, not people. Draw the actual furniture on the actual floor plan. A room that is theoretically big enough for three workstations often is not, once you add a door swing and a filing cabinet.
- Stand in it. Square footage on paper is an abstraction. Ten minutes in the room tells you more than the spec sheet.
- Bring your largest piece of furniture’s dimensions. Conference tables and reception desks are the usual casualties.
- Check the ceiling and the light. The same floor area feels entirely different at nine feet versus an open industrial ceiling, and daylight changes how much space people feel they have.
- Ask what happens when you need one more office. In a multi-suite building, the answer may be “take the one next door.” In a single-tenant lease, the answer is “move.”
Our checklist for the walkthrough itself is in What to Look for When Touring a Houston Office Space.
A Real Reference Point
2019 Washington Avenue is a 2,083-square-foot building of individual private offices, which means a tenant here can take exactly the number of rooms they need — one office, or several — while sharing the lobby, kitchen, coffee bar, and larger meeting areas with the rest of the building. Suites are available furnished or unfurnished. Because the rate is a flat all-inclusive monthly figure rather than a per-square-foot quote with a load factor on top, the sizing conversation stays about rooms and people instead of about arithmetic.
For most small professional firms, that is the right way around: decide how many doors you need, then find a building that will rent you exactly that many.
See the Space for Yourself
2019 Washington Avenue offers move-in-ready private offices about a mile northwest of downtown Houston, with parking at the front door, high-speed internet, utilities, and building access included in a flat monthly rate. Furnished or unfurnished, individual suites or larger multi-room configurations.
Call (713) 224-5529 or send us an inquiry to check current availability and schedule a tour. Questions first? The frequently asked questions page covers lease terms, parking, security, and what is included.