Why the Lowest Bid Is Rarely the Lowest Cost

How to Compare Contractor Proposals on a Luxury Renovation

Three proposals. The same drawings. A spread of several hundred thousand dollars between the highest number and the lowest.

On a luxury renovation, that spread almost never means one contractor is simply more efficient. It usually means the three proposals don’t describe the same project. One contractor priced what’s on the drawings. Another priced what they expect the drawings to become. A third priced a version that leaves the hardest parts for later.

Choosing the right contractor starts with making the proposals comparable. This guide explains how I do that for my clients, and what to look for before you sign.

Why bids on the same drawings come back so far apart

Contractors aren’t trying to mislead you. Each one reads the documents, makes assumptions where the documents are silent, and prices their own interpretation. On a high-end residence, where finishes are custom and conditions behind the walls are unknown, the documents leave a lot unsaid.

The result is that the total at the bottom of each proposal reflects two things: the cost of the work, and each contractor’s assumptions about what the work includes. Until those assumptions are aligned, comparing totals means comparing different projects.

Where a bid’s real cost is hidden

In my experience, the difference between a bid’s headline number and its true cost sits in five places.

1. Allowances. An allowance is a placeholder amount for something not yet selected, such as stone, plumbing fixtures, hardware or lighting. If one contractor carries $40,000 for stone and another carries $120,000, the first bid looks $80,000 cheaper. But the stone you choose will cost the same no matter who installs it. Low allowances don’t lower the cost. They push it back until after the contract is signed, when you have far less leverage.
2. Exclusions and “by others.” Every proposal lists what it doesn’t include. Common exclusions on luxury projects include millwork installation, protection of existing finishes, filing and expediting, temporary utilities, after-hours work, final cleaning and coordination with the building. Each exclusion is a cost that doesn’t disappear. It moves to you, to another vendor, or to a change order.
3. Assumptions and qualifications. These are the lines that begin with “assumes” or “based on.” For example: assumes existing subfloor is level, assumes no asbestos abatement, assumes standard working hours. Each assumption is reasonable on its own. Together they can quietly limit what the contractor has committed to.
4. General conditions and schedule. General conditions cover the cost of running the job: supervision, the site office, insurance, protection, debris removal. They depend directly on how long the job takes. A bid with an optimistic schedule will show lower general conditions. If the schedule isn’t realistic, the savings won’t be either.
5. The terms for changes. On a custom residence, there will be changes. The markup a contractor applies to change orders, and how that markup is calculated, can matter as much as the base price. A low bid with high change-order markups can end up being the most expensive choice by the end of the project.

An illustration

Here is a simplified example. It isn’t a specific project, but the pattern is one I see often.

	Contractor A	Contractor B
Base bid	$1,850,000	$2,060,000
Stone allowance (selection priced at $115,000)	$45,000	$110,000
Plumbing fixture allowance (selection priced at $90,000)	$35,000	$85,000
Millwork installation	Excluded (est. $60,000)	Included
Protection of existing finishes	Excluded (est. $25,000)	Included
Change-order markup	25%	15%
Adjusted cost before any changes	$2,060,000	$2,070,000

Once allowances are set at realistic numbers and the exclusions are priced, the $210,000 gap shrinks to $10,000. The lower change-order markup then puts Contractor B ahead on any project that sees more than about $100,000 of changes, which is modest for a custom home at this level. The “expensive” bid was the more complete one.

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How I compare bids for my clients

Comparing bids fairly is a discipline, not a spreadsheet exercise. The steps are consistent on every project.

1. Issue one clear bid package. Every contractor receives the same drawings, specifications, schedule expectations and building requirements, along with a bid form that tells them how to present the price. Clear inputs produce comparable outputs.
2. Require the same breakdown. Each proposal follows the same line-item structure, trade by trade. When one contractor lumps several trades together and another breaks them out, you can’t tell where the money is.
3. Replace open allowances with real numbers. Where selections aren’t final, I set a realistic allowance based on the design intent and require every bidder to carry the same figure. Where selections are made, the allowance goes away and the item is priced outright.
4. Put every exclusion and assumption in one place. I build a comparison sheet that lists each exclusion and assumption from every proposal side by side, then price or resolve each one. Whatever can’t be resolved goes into the contract in writing.
5. Ask for written clarifications. Questions go to every bidder in writing, and every answer comes back in writing. Verbal assurances in an interview don’t protect you.
6. Interview the team, not the company. I want to meet the project manager and superintendent who will actually run the job, and I ask about their current workload.
7. Then decide on value. Only after the proposals describe the same project does the price become meaningful. Even then, price is one factor among several.

What matters beyond the number

When the adjusted numbers are close, and they often are, the decision rests on things a bid total doesn’t show:

• The named team. Who will be on site every day, and have they done work at this level of finish?
• Building experience. Has the contractor worked under the rules of a Manhattan co-op or condominium, or a Florida association, like the one you’re in?
• A realistic schedule. Is the timeline supported by a sequence of work, or is it a number chosen to win the job?
• Terms for changes. Markup, how extra labor is priced, and how changes are documented and approved.
• How they communicate. How the proposal was prepared, and how the questions were answered, usually show how the project will be run.

Signs a low bid may become expensive

Not every low bid is a problem. Some contractors are genuinely efficient, and a good one is worth hiring. But certain patterns call for a closer look:

• Allowances well below what the design intent will realistically cost
• A long list of exclusions compared with the other bidders
• A schedule noticeably shorter than the others, with no explanation
• Vague language about protection, cleanup or coordination with the building
• Reluctance to answer clarifications in writing

Any of these can be resolved before signing. None of them should be discovered after.

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Frequently asked questions

How many bids should I get?

For most luxury residential projects, three to four qualified contractors is enough to produce real competition without overwhelming the process. More bids aren’t better if they’re less comparable.

My designer has a contractor they trust. Should I still bid the project?

A contractor your designer trusts is a real advantage, and they belong on the bid list. A competitive process tests the price and the scope. It doesn’t signal distrust. Good contractors expect it.

Are allowances always a bad sign?

No. Early in design, allowances are often necessary. The problem is an allowance that’s unrealistic or left open-ended. The goal is for every bidder to carry the same, realistic figure, and to price items outright as soon as selections are made.

Can I negotiate after the bids come in?

Yes, but negotiate scope and terms before price. Once the proposals are leveled, you often find that the right questions, such as clarifying an exclusion or adjusting a schedule assumption, are worth more than a discount.

I already have bids in hand. Is it too late for help?

No. Reviewing and leveling proposals before you sign is one of the most valuable moments to bring in an independent advisor. It can be a focused engagement on its own.

Final thoughts

A contractor’s proposal is an offer, not a promise of what the project will cost. What protects you is making sure every proposal describes the same project, in the same terms, with every assumption in writing, before you choose.

I don’t build, design or sell anything, so the only number I’m protecting is yours.

If you’re planning a luxury renovation or new construction in New York City, Florida or another select market, or you already have bids in hand, send a note with your project address, scope and target timeline. I’ll come back within one business day with an honest read on whether owner’s representation is the right fit for your project. If it isn’t, I’ll tell you.