How to compare commercial general contractor quotes

The lowest commercial construction quote is not always the lowest project cost. Before comparing totals, make sure each contractor has priced the same work, the same assumptions and the same level of responsibility.

Put every quote against the same scope

Start with the drawings, specifications, landlord criteria and written scope issued to bidders. Then create a comparison organized by major work categories. If one contractor includes demolition, permits, temporary protection and final cleaning while another does not, the bottom-line numbers are not comparable.

Ask bidders to clarify missing or combined categories. A shorter quote is not automatically simpler; it can make gaps harder to see. The goal is not to force every proposal into the same format. It is to understand who owns each part of the project.

Watch for owner-supplied and “by others” work

These notes transfer responsibility. Confirm who will buy, receive, store, move, install, connect and test each item. Equipment, signage, data, security, specialty fixtures and utility work commonly cross scope boundaries.

Separate fixed scope from allowances and unknowns

An allowance is useful when a selection or condition is not fully known, but it should identify what it covers. Compare both the amount and the basis. A lower allowance may make a quote look more competitive while leaving a predictable shortfall for later.

Also distinguish an allowance from a contingency. An allowance is tied to a particular item. Contingency protects against broader uncertainty. Neither should replace reasonable investigation or a clearly written scope.

Test whether the schedule fits the work

A proposed duration should account for permits, procurement, site access, inspections, shutdowns and the sequence between trades. Ask which long-lead items or owner decisions control the start and finish. If the business stays open, confirm how phasing affects productivity.

The contractor should be able to explain the schedule in plain language. A short duration with no assumptions may be a promise; a short duration with a coordinated plan is something you can evaluate.

Ask how changes are documented and priced

Changes are sometimes necessary, especially in existing buildings. The important question is how they are managed. Before award, understand:

• who can authorize additional work;
• what documentation is provided before proceeding;
• how labour, materials, subcontractors and markups are shown;
• how schedule impact is communicated;
• how urgent concealed conditions are handled.

A transparent change process protects both owner and contractor. It also makes final invoicing easier to reconcile.

Review project administration and close-out

Commercial construction includes coordination that is easy to overlook in a trade-only price: site supervision, safety documentation, progress updates, inspections, deficiency management, warranties, manuals and final cleaning. Confirm which of these are included and who is accountable for them.

Choose the clearest path to the finished project

Price matters. So do completeness, relevant experience, communication and the contractor’s ability to identify risk before work begins. Interview the leading bidder about the site, schedule and difficult parts of the scope. The quality of those answers often reveals more than a polished proposal.

After clarifications, record the final scope and assumptions in the contract documents. The best comparison process ends with one clear baseline for construction—not a stack of emails everyone remembers differently.