Commercial Build Out Cost: Why a $110 Per Square Foot Quote Is Really $145

Your buildout budget is probably off by six figures. Not off by a little. Off by enough to blow up a deal you just spent three weeks underwriting.

I ran a 5,000 square foot example on Office Hours last week. The contractor quoted $550,000. By the time we accounted for everything that project actually required, we were at $725,600. Nothing went wrong. Nobody made a mistake. Every dollar of that $175,600 gap was completely predictable if you knew where to look.

But you don't know what you don't know. If nobody ever told you that permitting, MEP drawings, code triggers, and four months of carry are your problem and not the contractor's, of course you're going to miss them. So let me walk you through how a real commercial build-out budget actually gets built.

The 5,000 SF Buildout, By the Numbers

$110/SF

What the contractor quoted

$145/SF

What the project actually cost

$175,600

The gap you have to go find

The Contractor Quote Is Not Your Budget

Here's the single biggest thing I want you to take away from this. The quote is not the budget. It doesn't matter how big or how small the job is. Whatever the contractor tells you is still not the total cost of your project.

A contractor prices the scope you describe to them. Walls, floors, HVAC, paint, lights. Maybe you're redoing the exterior, redoing the landscaping, sealing and striping the parking lot. That is what they are quoting, and they're quoting it well. What they are not quoting is permitting, architecture, engineering, third party inspections, or the months your suite sits empty after they hand you the keys. That's not their job. You're the developer. They're the contractor.

And here's a wrinkle that catches first-timers. A lot of builders won't even give you a number until they have drawings. It doesn't have to be a full 100% set of construction documents, schematics might be enough, but you are spending real money on architecture and engineering before you ever see a quote. So the number everybody treats as step one is actually step three.

For most people the budget gets built one of two ways. Either you take your square footage times a price per foot from the last deal you did, or a contractor who wants the space prices the scope you gave him. Then that number drops into your model as your tenant improvement allowance or your total capital expenditure, and you go on with your underwriting. Every step in that process is right. The output is still wrong.

How a $550,000 Quote Becomes $725,600

The example I used is 5,000 square feet of second generation retail converting to medical use. Here's the whole stack.

Hard costs: $550,000. That's the contractor quote at $110 a foot. And before you tell me $110 a foot is crazy for a conversion, it isn't. Retail to medical, you're spending that all day. Retail to restaurant, same thing, easily.

Soft costs and code: $130,000. Roughly $62,000 in soft costs and another $68,000 in code triggers. That's $26 a foot the contractor never mentioned because it was never his to mention.

Interest carry: $45,600. Four months of lost rent and construction interest between the day you deliver the space and the day a tenant is actually paying you.

Add it up and you're at $725,600, or $145 a foot, on a job that got quoted at $110. Now, as long as you accounted for that going in, you're totally fine. That's a normal project. The worst thing you can do is get halfway through and have to go back to your partners or your investors and say, hey, we're $175,000 short, we need to figure this out.

Where the $175,600 Gap Comes From

$62,000

Soft costs the quote skips

$68,000

Code triggers from the change of use

$45,600

Four months of carry and lost rent

Soft Costs: The $62,000 Nobody Quotes You

Soft costs are everything that has to happen for the hard costs to be legal. On this project they run about $62,000, and they break down like this.

Architecture and MEP engineering: $38,000. MEP is mechanical, electrical, and plumbing. Depending on your scope you're going to need stamped drawings for all of it, and you cannot pull a permit without them.

Permit and plan review fees: $12,000. These are municipal fees that scale with the job valuation, so the more expensive your construction, the more expensive these get.

Special inspections and testing: $8,000. Third party, required, billed hourly.

Survey and as-builts: $4,000. Nobody has plans for a 1980s building. And once you're finished, you have to shoot the as-builts and hand them back to the city.

I'm living that last line item right now at our boutique hotel here in Nashville. We opened April 1st and we are still operating on a temporary use and occupancy permit. Everything is built. Everything has been approved and signed off on. But our engineer was very sick with cancer and passed away last month before he could get out and shoot the storm water as-builts, and the city can't issue our final permit without those on record. A $4,000 line item is holding up a permit on a finished hotel.

Change of Use Triggers Code, and Code Is Expensive

This is the one that wrecks budgets, and it's the one most new investors have never heard of.

If a building has been used as an office since 1850, you're generally grandfathered in as long as you keep using it as an office. The second you switch it to retail, you've done what's called a change of use and occupancy, and now you have to bring that building up to modern day code to get your new certificate. Office to retail, retail to medical, warehouse to office, it doesn't matter which direction. It's a complete switch.

Every municipality handles this a little differently, so I'll always talk in generalities here. But in our example, budgeting zero for code triggers cost $68,000 right off the bat. Accessibility. Egress. Sprinkler heads. Fire and life safety.

And sprinklers deserve their own warning. If we're adding sprinklers to a building, we start at $150,000. Doesn't matter how big or small the space is, that's where we start. I just added sprinklers at my self storage facility outside Chattanooga and it ran over $400,000, partly because we had to run a new water line to the building. Even without the water line it still would have been well over $200,000.

One more thing on this. If your building was built before 1995, your accessibility and egress rules are very different. The Americans with Disabilities Act completely changed how buildings get constructed, and anything older than that is grandfathered in until the day you trigger a change of use.

Time Is a Line Item

This is the piece I see almost nobody account for, even sophisticated investors running real models.

Permit review takes what it takes. I've seen three months on the short end. I've seen six, twelve, eighteen. On our hotel here in Nashville it took nearly two years to get fully permitted. It was an absolute nightmare. They made us jump through all sorts of hoops and we argued with the city over things that were, frankly, very stupid.

Long lead equipment will stall you. During COVID we had to order our roofing materials the day we started construction, even though we knew we weren't roofing for six months, because that's how long the lead time was. These days if you're ordering windows or transformers you could be waiting months. Get a good contractor or interior designer checking lead times on every special order item, because the last thing you want is to spend all your money and then sit there waiting on one thing. Every month you wait, you're drawing on that construction loan and paying interest anyway.

You pay rent and interest either way. In our example that's roughly $30,000 of lost rent and $15,600 of construction interest across four vacant months. Every dollar adds up, which is exactly why you want to run as tight a timeline as you can.

So how many months of carry should you budget? Match it to your market. If absorption in your submarket says it takes six months to fill that kind of space, carry six months. If it's nine, carry nine. If leasing velocity is so hot that you're full within three months of delivery, carry three. Go talk to brokers, look at the data, and budget what your market actually tells you. You can build those lease-up months straight into the model in our Deal Analyzer, and our CRE calculators will get you in the range on the construction side.

How to Protect Yourself Before You Sign Anything

Price everything out before you sign anything. Here's my checklist.

Ask the city what the use could trigger, before the LOI. It's free to go ask them. Do it before you're contractually committed to anything.

Put use-triggered costs on the tenant in the letter of intent. I write into my LOIs that anything triggered by that tenant's specific use is their responsibility, and I do it even when I'm going from restaurant to restaurant. Here's why. Where we are, a restaurant with an occupancy of 99 or fewer doesn't need sprinklers. If the next restaurant changes nothing but the layout and wants an occupancy of 100, that's a full sprinkler system. I'm not paying for that as the owner. The tenant triggered it, so the tenant covers it.

Negotiate your tenant improvement allowance and free rent for delay in the LOI. That's the moment you have leverage. Once the lease is signed, you don't.

Hire the architect before the general contractor. If you've done a dozen of these, design-build is fine and you already know what you're doing. If this is your first buildout, hire the architect, get the drawings, then hand them to a GC. You want a second set of eyes on everything, and if you don't know what you're doing, you can't be the second set of eyes. This is also where a broker who has actually been through buildouts earns their fee, and it's worth reading through the questions to ask before hiring a commercial contractor before you sign with anybody.

Get the code review in writing, not on a phone call. Make them confirm where you stand and what you're going to need. And know that even in writing, a city can come back later and change its mind. You can wave that email at them and they can say, well, what are you going to do, sue us? Budget for that possibility.

Add 10 to 15% contingency, plus several months of carry. Non-negotiable. If your first buildout goes perfectly, congratulations, you just got a return on money you'd already set aside.

If this is your first one, get experts around you. A broker who's been through buildouts. A contractor who's done this exact conversion. The right architect and engineer. The worst outcome is taking all of it on yourself, spending the money, and then getting stuck in a situation you could have seen coming.

Key Takeaways

The quote is not the budget. A contractor prices the scope you hand him. Permitting, drawings, inspections, and carry are yours, and on a 5,000 foot conversion that was $175,600.

Budget $26 a foot or more in soft costs. Architecture and MEP, permit and plan review, special inspections, survey and as-builts. None of it is optional and none of it is quoted.

A change of use brings the whole building up to code. Office to retail, retail to medical, it doesn't matter. Accessibility, egress, and fire and life safety get triggered. If sprinklers are in play, start at $150,000.

Carry is a real line item. Four vacant months cost $45,600 in lost rent and construction interest. Budget carry to match your market's absorption, not your optimism.

Push use-triggered costs onto the tenant. Write it into the letter of intent. If their occupancy count triggers a sprinkler system, that's their bill, not yours.

Add 10 to 15% contingency and get the code review in writing. And on your first buildout, hire the architect before the general contractor so somebody besides you is checking the work.

This article is adapted from a conversation on the Tyler Cauble YouTube channel. We go live for Office Hours every Tuesday at 8:30am Central. Come ask your questions.

Want me walking you through your actual deals?

Get my step-by-step investment blueprint, the software, and personalized feedback on every deal inside the CRE Accelerator.

Learn About the CRE Accelerator