How to Compare Commercial Construction Bids Without Getting Burned
How to Compare Commercial Construction Bids Without Getting Burned
Anyone can compare three totals. That takes ten seconds and tells you almost nothing. When you compare commercial construction bids, the real differences sit above the bottom line — in what each contractor left out, what they guessed at, and whether they even priced the same job you asked about. The operators who get burned are the ones who started at the number. The ones who don't start at the exclusions page and work down.
The short version
- Read the exclusions list first. A low number with a long exclusions list is not a low number.
- Count the allowances. Every round-number allowance is a line that has not actually been priced.
- Confirm all three bidders priced the same scope. A missing scope item is the most common reason a total looks low.
- Compare schedules next to dollars. A bid that misses your opening date is not comparable, even if it's close on price.
- Ask who actually does the work — the contractor's own crews or subcontractors they manage. It changes both price and accountability.
- The bid is a preview of the relationship. Clarity now predicts clarity when something goes wrong.
Why the bottom line is the last thing to compare
Three contractors walk the same space. All three see the same drawings. Three different totals come back, sometimes far apart.
That spread almost never means one contractor is cheap and one is greedy. It usually means they priced three different jobs. One assumed the existing HVAC stays. One included a new rooftop unit.
So the total is the output of a hundred assumptions. Compare the assumptions and the total explains itself.
How to compare commercial construction bids line by line
Use the same order every time. Exclusions, allowances, scope, schedule, then who does the work. Price last.
| What you're comparing | What a solid bid looks like | Red flag |
|---|---|---|
| Exclusions | A short, specific list — "fire sprinkler head relocation excluded, priced separately once the fire marshal comments come back" | A long list of vague carve-outs, or no exclusions section at all |
| Allowances | Few, each tied to a real quantity or spec — flooring allowance per square foot with the product named | Several round numbers with no basis shown |
| Scope coverage | Every item on your scope list appears, priced or explicitly excluded | Items simply missing, with no mention either way |
| Schedule | Calendar duration, a start condition (permit in hand), and any long-lead items called out | "Approximately X weeks" with no start trigger |
| Who performs the work | Named trades, or a clear statement that trades are subcontracted and managed | Won't say, or the answer changes between conversations |
| Contract form | Lump-sum proposal with a scope letter you can read in one sitting | A one-page total with no attached scope |
Read the exclusions list first
The fastest way to understand a bid is to read what it leaves out.
Exclusions are the lines the contractor is telling you they will not pay for. Common ones on a tenant improvement: permit fees, impact fees, landlord-required deposits, fire alarm monitoring, low-voltage cabling, furniture, kitchen equipment, exterior signage, and anything hidden behind existing walls.
None of those are dishonest. Some belong to the landlord. Some belong to your equipment vendor. The problem is when three bids exclude three different sets of things and you compare the totals anyway.
Do this instead. Make one list of every exclusion across all three bids, then ask each contractor to price the ones they left out. Now you're comparing the same job.
A low number with a long exclusions list is not a low number. It's the same number, hidden in a different place.
Count the allowances
An allowance is a placeholder dollar amount for work that has not been priced yet. Flooring, light fixtures, millwork, and door hardware are the usual candidates on an office renovation.
Allowances are not a scam. Sometimes you genuinely have not picked the tile yet. But every allowance is a line that could move after the contract is signed, and it only ever moves one direction in practice.
So count them. Then ask two questions about each one:
- What quantity and product is this based on?
- What happens to the total if I pick something above it?
A contractor who answers both in a sentence each did the work. A contractor who says "we'll figure it out during construction" is handing you a change order with a delayed fuse. If half the bid is allowances, you don't have a price — you have an estimate wearing a price's clothes.
Make sure all three bidders priced the same job
A missing scope item is the most common reason one total looks low.
This is on you as much as them. If your invitation was "here are the drawings, send me a number," you invited three different interpretations. If it was a written scope list, you get three comparable answers.
Build a scope list before you send anything out
Write one page. Rooms and finishes. Electrical you know you need — panel capacity, dedicated circuits for equipment. Plumbing. HVAC changes. Anything the landlord requires in the lease work letter. Anything your brand standards require if you're a franchisee.
That page is the basis of the whole comparison. Contractors call this stage pre-construction — the pricing and planning that happens before anyone swings a hammer, and the part that decides whether your budget holds.
If your scope list feels thin, that's the moment to get a contractor involved before bidding rather than after — call us and we'll help you write it.
Compare the schedule, not just the dollars
A number that hits your date and a number that does not are not comparable, no matter how close the dollars sit.
Here's the scenario that costs operators the most money. A practice owner takes a bid that's modestly lower and four weeks longer. Those four weeks are four weeks of rent on an empty space plus four weeks of revenue that never happens. The savings evaporate before drywall goes up.
So ask each bidder for three things: total calendar weeks, what triggers week one (usually permit in hand, not contract signing), and which materials have long lead times. Rooftop units, electrical switchgear, and custom millwork are frequent offenders.
Also ask what their number assumes about permitting. Review times vary by jurisdiction and none of it is under the contractor's control.
Self-performed vs. managed — who actually does the work
Some contractors do certain trades with their own employees. Most commercial general contractors subcontract the trades and manage them. Both models work. They fail differently.
.compare-table { border-collapse: collapse; width: 100%; font-family: sans-serif; font-size: 14px; } .compare-table th, .compare-table td { border: 1px solid #333; padding: 8px; text-align: left; vertical-align: top; } .compare-table th { background: #f2f2f2; } .compare-table tr:nth-child(even) td { background: #fafafa; }| Factor | Self-performed trades | Subcontracted and managed |
|---|---|---|
| Price | Fewer markups on that trade | Competitive bids on each trade |
| Schedule control | Direct over that crew | Depends on the GC's relationships and backlog |
| Accountability when something's wrong | One phone call | The GC owns it, and coordinates the fix |
| Flexibility on unusual scope | Limited to what they perform | Wider bench of specialty trades |
What matters is not which model. It's whether you know which one you bought. Ask directly: "Which trades are yours and which are subcontracted?" Then ask who your single point of contact is, and whether that person is on site or in an office. On a restaurant buildout with a hard opening date, the answer to that second question matters more than the answer to the first.
Where this goes wrong
- Treating allowances as fixed costs. Then acting surprised in month two.
- Not calling the references. Ask them one question: what changed between the bid and the final invoice, and why.
- Skipping the site walk. A contractor who bids off drawings alone has not seen the ceiling above your suite. That's where the surprises live, especially in a warehouse conversion.
- Ignoring how they communicate during bidding. If questions take a week now, they will take longer when the crew is standing around waiting for an answer.
- Assuming the landlord's allowance covers the gap. Read the work letter. Tenant improvement allowances often exclude the exact items your bids exclude.
FAQ
How many bids should I get for a commercial buildout?
Three is the practical number. One gives you no reference point. Five means you spend weeks reconciling scope differences and some good contractors decline to bid a crowded list. Three bidders, one written scope list, same drawings, same deadline.
Why is one contractor's bid so much lower than the others?
Usually scope, not efficiency. Something is excluded, allowanced, or simply missing. Ask the low bidder to walk you through their exclusions page and their allowance basis line by line. If the gap is real after that, they may just have better subcontractor pricing on your trades.
What's the difference between an allowance and a change order?
An allowance is a placeholder in the original contract for work not yet specified. A change order adds or removes scope after signing, at a price negotiated then. Allowances are known unknowns. Change orders are new decisions. Both move your total, so track both.
Should I always pick the lowest bid?
No. Pick the bid that covers your full scope, hits your date, and comes from someone who answered your questions clearly. Once you normalize exclusions and allowances across all three, the lowest number often changes. Sometimes the original low bidder ends up in the middle.
What should be in a bid document at this project size?
For a job in the $50K–$500K range, expect a lump-sum proposal with a written scope letter: what's included, what's excluded, allowances and their basis, schedule duration, payment terms, and the drawing set the price is based on. If you can't tell what you're buying in one read, ask for a rewrite.
Can I ask a contractor to match another contractor's price?
You can, but it's the wrong ask. Ask them to explain the difference instead. If the gap is scope, you learn something. If a contractor drops their number without changing scope, ask what they're planning to cut — because something is coming out.
Line up your bids and read the top half
Put the three proposals side by side. Read the exclusions, count the allowances, check the scope list, check the date. Then look at the totals. Most of the time the decision makes itself.
When we bid, we spell out scope and exclusions in writing so you can compare us fairly against anyone else on your list. Call (404) 724-8709 and we'll walk your space, ask what the business needs to do in it, and give you a proposal you can hold us to — the first call takes about fifteen minutes, and it's usually enough to tell you whether your budget and your date are in the same neighborhood.