Here's how it usually goes.
You own a small commercial property. You have an idea — add a second floor, convert a storefront to a restaurant, build out the rear of the lot. You call an architect, describe what you want, and ask for floor plans. The architect asks a bunch of questions you weren't expecting: What's the parking count? Do you have a title report? What's the zoning? Do you know the easements? Have you talked to the city?
You don't have answers to most of these. Neither does the architect — yet. So the architect starts drawing floor plans anyway, because that's what you asked for, and three months later you find out the project doesn't work. Not because the design was bad, but because the parking math doesn't close, or the building code triggers sprinklers you can't afford, or an easement sits exactly where the addition was supposed to go.
Three months of design fees, wasted. Not because anyone made a mistake — because the wrong question was asked first.
The right first question isn't what should this building look like? It's what is this building allowed to be?
That's what a feasibility study answers.
A feasibility study is the question before the design
A feasibility study is a structured analysis that determines what you can build on a specific property — before you spend money on design. It's not a set of floor plans. It's not a rendering. It's the homework that tells you whether the project you're imagining is physically, legally, and financially possible on the lot you own.
A good feasibility study answers five questions:
- What does zoning allow? Permitted uses, maximum building size (Floor Area Ratio), height limits, setback requirements, parking ratios.
- What does the site physically support? Easements, lot shape, existing structure condition, topography, utility access.
- What does the building code require? Construction type, fire sprinkler triggers, occupancy separation, egress paths, accessibility.
- What will the city likely approve? Entitlement path, discretionary reviews, pre-application feedback, political context.
- What are the realistic options? Not one design — typically three to six massing scenarios, each with a clear picture of what it achieves, what it costs, and what stands in the way.
The output is a report — usually 5 to 15 pages — that lays out those options side by side and recommends a direction. It's the document that lets you say "yes, let's design this" or "no, let's adjust" before any significant money has been committed.
What a feasibility study catches that design doesn't
Design assumes the project is buildable and works forward from there. Feasibility asks whether the project is buildable and works backward from the constraints. These are fundamentally different questions, and they catch fundamentally different problems.
Here are the things we've seen kill projects that skipped feasibility — every one of these came up in real client work:
Parking
A restaurant operator signed a lease on a 3,000-square-foot retail space and hired an architect to design the buildout. Six weeks into design, the architect ran the parking calculation and discovered that a restaurant use required twice as many parking spaces as the retail use it was replacing. The landlord's lot didn't have them. The project died — after the operator had already paid for schematic design, a kitchen consultant, and a deposit on equipment.
A feasibility study catches this in week one. We wrote about parking constraints in detail in our post on the six barriers to expansion — it's almost always the binding constraint on small Bay Area lots.
Sprinkler triggers
An owner wanted to add a small apartment above their commercial space — a mixed-use play for long-term rental income. Good instinct. But the California Fire Code requires automatic fire sprinklers throughout any building with any residential unit. The sprinkler system plus a new water service line from the street added a cost that erased three years of rental income from the apartment. Had they known this before designing, they might have chosen a second-floor office instead — same construction, no sprinkler trigger, faster payback.
Easements
An owner planned a rear addition on a deep lot. The lot looked like it had 30 feet of buildable space behind the existing structure. A title report — which a feasibility study always pulls — revealed a 15-foot sewer easement running across the rear of the property. The buildable space was actually 15 feet, not 30. The addition shrank by half before a single line was drawn. You can look up recorded easements through your county recorder's maps and records, but most owners don't think to check until it's too late.
Construction type thresholds
An owner wanted to add a second story to an existing single-story commercial building. The existing building was Type V-B construction — standard wood framing, the cheapest type. Adding a second story meant either upgrading the entire existing building to V-A (opening walls and ceilings throughout to add fire-rated layers) or installing sprinklers. Both paths added meaningful cost. A feasibility study would have flagged this choice at the outset and priced both paths before design began — instead of discovering it during plan check, when changing direction costs ten times as much.
The 49-occupant line
A food business wanted to maximize their dining area in a 1,300-square-foot space. The California Building Code allows a single exit from a space with 49 occupants or fewer. At 50 occupants, you need two exits — which means a second door, a second path of travel, and a reconfigured layout that eats into your seating. Feasibility studies model the occupant load before the architect draws a single table. The difference between 49 and 50 people is the difference between one door and two, and sometimes between a project that pencils and one that doesn't.
What's actually in a feasibility study
Every firm structures theirs differently. Ours typically include:
A site and zoning fact sheet
The baseline numbers for your property: lot dimensions, zoning district, allowable Floor Area Ratio, height limit, setbacks, parking ratio, current building area, current occupancy. This is the factual foundation everything else builds on. Most of this comes from the city's published zoning code and the county assessor's records.
An easement and encumbrance map
We overlay the recorded easements from your title report onto the site plan to show the actual buildable area — the part of the lot where you can legally place structure. On small lots, this area is often significantly smaller than the raw lot size.
A code analysis
Construction type, occupancy classification, sprinkler triggers, egress requirements, accessibility requirements, fire separation requirements. This is where we identify the code thresholds that affect cost — like the California Building Code's sprinkler triggers, the occupant-load breakpoints, and the construction-type upgrade thresholds.
Massing options (typically 3–6)
Not designs — scenarios. Each option describes a different building configuration: how much new area, how many stories, what occupancies, what parking count, what code implications. We present them side by side so you can compare what each option achieves against what it costs and what stands in the way.
On a recent project, we evaluated six options ranging from a simple interior remodel (no new construction) to a full two-story rear addition with an apartment above. The options ranged from 1,300 to 4,400 square feet. Only two of the six actually penciled when all six constraints were considered together. That clarity — knowing which options are real and which aren't — is the entire point.
A recommendation and next steps
We tell you which option we'd pursue and why, and we lay out the immediate next steps: order a site survey, schedule a pre-application meeting with the city, engage a structural engineer for a quick assessment. The recommendation is a direction, not a commitment — you can adjust once the city weighs in.
The pre-application meeting: the step after feasibility and before design
Most California cities offer pre-application meetings — a sit-down with the planning and building departments where you present your proposed project informally and they tell you what they see. It's not an approval. It's a reality check.
A good feasibility study gives you the material you need to walk into that meeting prepared. Instead of "we want to expand our building, what's possible?" — which gets you a vague answer — you arrive with specific questions:
- We're proposing a 2,500-square-foot building with 9 parking spaces. Does the city accept this parking approach, or will you require a Traffic Demand Management study?
- We want to avoid sprinklers by upgrading to V-A construction. Will you accept a V-A retrofit of the existing building?
- The expansion triggers your 25% improvement rule. What specific site upgrades will you require?
These are questions the city can actually answer. And their answers tell you whether the project works before you've spent money on design drawings.
If you're in the Bay Area, most cities' planning departments publish their general plan and pre-application process online. Some charge a small fee for the meeting; many offer it free.
What a feasibility study costs — and what it saves
Feasibility studies for small commercial projects typically take two to four weeks and represent a modest investment relative to the overall project budget. The exact scope depends on the complexity of the site, the number of options to evaluate, and how much is already known about the property.
What it saves is harder to quantify but almost always larger. Design fees on a project that doesn't clear planning. Consultant costs on a structural engineer who discovers the foundation can't carry a second floor. Permit fees on an application that gets rejected. Lease deposits on a space whose parking doesn't support the intended use. Lost time — months of it, sometimes a year or more.
The most expensive feasibility study is the one you don't do. The second most expensive is the one you do after design is already underway.
When you need a feasibility study
Not every project needs one. A simple interior remodel with no change of use, no expansion, and no occupancy change usually doesn't — you can go straight to design. But if any of the following are true, a feasibility study will pay for itself:
- You're adding square footage — any addition, any direction, any size.
- You're changing the use — retail to restaurant, office to medical, commercial to mixed-use with residential above.
- You're adding a story — vertical expansion on an existing building triggers structural, fire, and egress questions that a feasibility study answers.
- You don't know your easements — if you haven't pulled a title report recently, you don't know the buildable area of your lot.
- Parking feels tight — if you're already close to full on parking and want to add area or change to a more parking-intensive use.
- You're buying a property with development in mind — the best time to do a feasibility study is before you close, not after.
- You've been told "it depends" — that's the sound of six interacting constraints that haven't been analyzed yet.
How to get the most out of a feasibility study
If you've decided a feasibility study makes sense, here's what to have ready for the first conversation. None of this is required — we can gather it — but having it in hand means the study starts faster and the results come back sharper:
- Your preliminary title report. The one from when you bought the property. It shows all recorded easements and encumbrances. If you don't have it, a title company can pull a new one for a few hundred dollars.
- Your property's zoning designation. Usually findable on your city's online zoning map, or by calling the planning counter.
- A rough site measurement and parking count. Walk the lot, count the spaces, measure roughly. Phone photos of the building and the parking lot are useful too.
- A description of what you want to do. Even if it's vague. "I want to add an office upstairs." "I want to convert this to a restaurant." "I want to know what's possible." All of these are good starting points.
- Your budget range, if you have one. Not for the feasibility study — for the project itself. Knowing whether you're thinking $200,000 or $800,000 helps us focus on the options that are actually in play.
The first conversation is usually 30 minutes. By the end of it, we'll know whether a feasibility study is the right next step, or whether your project is straightforward enough to go directly to design.
Feasibility vs. design vs. permitting: three different phases
One source of confusion: owners sometimes think hiring an architect means all three of these happen at once. They don't. They're sequential, and each one answers a different question:
- Feasibility answers what can we build? — weeks, modest cost, no drawings, no permit applications.
- Design answers what should we build? — months, larger investment, produces floor plans, elevations, and construction documents.
- Permitting answers will the city sign off? — months, city review fees, plan check, inspections.
Feasibility is the cheapest phase. It's also the phase where you have the most freedom to change direction, because nothing has been committed to yet. Once design starts, changes get expensive. Once permitting starts, changes get very expensive. The leverage of a feasibility study is that it concentrates the most important decisions into the phase where they're cheapest to make.