A contractor bid review example is most useful when it reveals what a proposal does not say. Homeowners often receive two or three bids, see a large difference in price, and assume the lowest number represents a better deal. After more than 40 years around home additions, I can tell you that the difference is often hidden in the scope, assumptions, allowances, and exclusions.
A bid is not simply a price. It is a contractor’s interpretation of the project as it has been described to them. If the plans, specifications, and site conditions are unclear, each contractor may be pricing a different version of the same addition. Comparing totals under those circumstances can lead to an expensive decision.
The goal of a thoughtful bid review is not to force every contractor to use the same number. It is to understand what each number includes, what it leaves to chance, and what questions need to be resolved before you commit.
A Contractor Bid Review Example: Three Proposals
Consider a homeowner planning a 500-square-foot family room addition with a small mudroom connection to the existing house. The homeowner has preliminary plans, but the drawings do not yet specify all finish materials, structural details, or site work requirements.
Three bids arrive:
| Contractor | Bid Amount | Initial Impression | |—|—:|—| | Contractor A | $218,000 | Lowest price, short proposal | | Contractor B | $246,000 | Detailed scope and clear allowances | | Contractor C | $271,000 | Broad scope, several high allowances |
At first glance, Contractor A appears to save $28,000 compared with Contractor B and $53,000 compared with Contractor C. That is enough money to get anyone’s attention. But a useful review starts by asking a more basic question: are these contractors actually pricing the same work?
Contractor A’s two-page proposal includes framing, roofing, siding, windows, drywall, electrical, and “standard finishes.” It excludes landscaping, painting, permit fees, engineering, and “unforeseen conditions.” The proposal does not identify window manufacturer, siding match, insulation level, flooring allowance, or how the new roof will tie into the old roof.
Contractor B’s proposal lists the same major categories, but it also identifies a $12,000 flooring and trim allowance, $9,500 for electrical fixtures, $7,800 for painting, $6,000 for permit and engineering costs, and $14,000 for grading, drainage, and restoration. It specifies that the roof tie-in will include removal and replacement of enough existing shingles to create a proper weather transition.
Contractor C includes many of these same items, but carries a $25,000 site-work allowance because the contractor sees potential drainage and access concerns. The proposal also includes a larger window allowance and a contingency for possible structural changes where the addition connects to the existing house.
None of these bids is automatically right or wrong. But they are not yet directly comparable.
Look Past the Bottom-Line Number
The fastest way to make bids comparable is to organize each proposal by category. You are looking for scope gaps, vague language, and differences in assumptions. A lower bid may still be the right choice, but only after those differences are understood.
Site work and existing conditions
This is one of the most common sources of unpleasant surprises. Does the bid include demolition, tree removal, excavation, hauling, grading, drainage improvements, temporary protection, and repair of disturbed lawn or hardscape? Does it address difficult access for equipment or material delivery?
In the example, Contractor A may be less expensive partly because site restoration and drainage are not included. Contractor C may look expensive because that contractor has assigned a realistic allowance to a known unknown. The appropriate response is not to reject Contractor C. It is to ask what was observed at the site and whether the concern can be investigated before the contract is signed.
Connection to the existing house
A home addition has to work as part of the original home, not simply attach to it. The bid should address how new and old foundations, roofs, exterior finishes, flooring, heating systems, and interior trim will meet.
For example, “match existing siding” can mean very different things. Is the contractor planning to locate discontinued siding, use a close substitute, repaint the entire exterior, or reside an entire wall so the transition is less visible? Each choice affects cost and appearance. This is particularly important for homeowners who want the addition to look and feel as though it was always part of the house.
Allowances versus fixed pricing
An allowance is a placeholder amount for an item not selected or fully defined when the bid is prepared. Allowances are normal in remodeling. They become risky when they are unrealistically low or when the proposal does not explain what they cover.
Suppose Contractor B includes a $12,000 allowance for flooring, trim, and interior doors. Ask what level of material that amount assumes. If your preferred engineered flooring, custom millwork, and solid-core doors are likely to cost $20,000, the bid is not really $246,000. It is closer to $254,000 before other changes.
A fixed price offers more certainty only when the scope is genuinely defined. A fixed price built on incomplete plans may simply move uncertainty into change orders later.
Exclusions and owner responsibilities
Every proposal should state exclusions clearly. Common examples include design fees, engineering, permit costs, utility upgrades, specialty inspections, landscaping, window treatments, appliances, and repairs to concealed conditions.
Exclusions are not necessarily warning signs. A contractor cannot reasonably include every possible unknown. The concern is whether exclusions are visible and whether you understand who is responsible for them. A short proposal that says “all work not specifically listed is excluded” may be legally clear, but it places a great deal of responsibility on the homeowner to identify what is missing.
Questions to Ask Before Comparing Bids
When a bid is vague, do not try to fill in the gaps yourself. Ask each contractor to clarify their own assumptions in writing. You might ask: What is included in site restoration? Which permit, engineering, and inspection costs are included? What material quality is assumed for windows, flooring, trim, and exterior finishes? How will the new roof and siding connect to the existing house? What conditions could lead to a change order?
Also ask whether the contractor saw any issue that is not reflected in the price. Experienced contractors sometimes recognize concerns but do not include them unless asked. Learning about those concerns early gives you a chance to investigate, revise the design, or budget appropriately.
A good bid review should also examine schedule and process. How long is the price valid? What deposit and payment schedule is proposed? Who will supervise the work? How are changes documented and approved? A lower bid can lose its value quickly if the project is poorly managed or if decisions are left unresolved until construction is underway.
When Bids Cannot Be Fairly Compared
Sometimes the real problem is not the bids. It is that the project has gone to bid too early.
If you are still deciding on the size of the addition, window locations, exterior materials, heating and cooling approach, or kitchen layout, contractors have no choice but to make assumptions. You may receive numbers, but they are planning estimates rather than reliable construction proposals.
In that situation, the wiser next step may be a feasibility review or home addition strategy session rather than another round of bidding. Clarifying the project roadmap before construction pricing can save months of confusion and prevent you from choosing a contractor based on an incomplete picture.
Independent advice is particularly valuable when a homeowner has one low bid and two higher bids. An objective review can separate legitimate efficiency from missing scope, inflated allowances, or a design issue that has not been resolved. The purpose is not to favor a contractor. It is to help you make a decision with your eyes open.
The best proposal is rarely the one with the lowest total or the longest document. It is the one that most clearly reflects the home addition you intend to build, identifies the remaining uncertainties honestly, and gives you a practical basis for moving forward with confidence.