RFQ vs RFP vs ITB: Which Solicitation Is Which (and How to Respond)

Public owners buy professional services and construction in a few standard ways, and the acronym on the cover of the solicitation tells you how you will be selected - and therefore what you should submit. The three most common are the RFQ (Request for Qualifications), the RFP (Request for Proposal), and the ITB (Invitation to Bid). They differ on one core question: is the award decided by qualifications, by overall value, or by price?

RFQ: qualifications come first

An RFQ asks firms to demonstrate they are qualified - relevant experience, key personnel, and past performance - usually before any price conversation. Firms respond with a Statement of Qualifications. The owner ranks the responses, shortlists the most qualified, and often interviews before selecting. It is the standard front door for architecture and engineering work under Qualifications-Based Selection, where price is negotiated only with the top-ranked firm after selection. Do not volunteer fee in an RFQ response unless it is explicitly requested.

RFP: approach and value

An RFP asks for more than qualifications: a technical approach, a schedule, a staffing and management plan, and - in most non-QBS procurements - a price. The owner scores the response against published evaluation criteria, frequently as a best-value tradeoff that weighs technical merit against cost. RFPs suit work where how you would do it genuinely varies between firms, so the owner wants to compare approaches, not just credentials or bids.

ITB: the lowest responsive price wins

An Invitation to Bid (also called an Invitation for Bid, or IFB) is used when the work is fully defined by plans and specifications. Firms submit sealed price bids, the owner opens them publicly, and the award goes to the lowest responsive, responsible bidder. There is no scoring of approach because the scope is fixed and comparable across bidders. This is the classic method for construction, where the design is complete and the question is simply who will build it for the best price.

How they fit together on one project

These are not always separate choices - a single project can use more than one in sequence. A common pattern is qualifications-first, then a fuller submission: an RFQ shortlists the most qualified firms, and shortlisted firms are then invited to interview or submit a proposal. Design-build pursuits often run this way, with a qualifications shortlist followed by a best-value proposal. On the construction side, a project might be designed under a QBS-selected A-E contract and then built under an ITB. Knowing where you are in that sequence tells you which document to prepare.

The rest of the alphabet: RFI and RFQ-as-quotation

Two related terms cause confusion. An RFI (Request for Information) is not a competition at all - it is market research, used by an owner to learn what is available or to shape a future solicitation; responding positions you but wins nothing directly. And 'RFQ' is ambiguous outside A-E work: in commodity and product procurement it often means Request for Quotation, a straight price request, not a Request for Qualifications. Always read the document to confirm which one you are holding rather than assuming from the acronym.

How to tell which one you're looking at

• It asks for qualifications and no price, and mentions shortlisting - that's an RFQ (qualifications)
• It asks for a technical approach, schedule, and usually a price scored together - that's an RFP
• It asks for a sealed price bid against complete plans and specs, awarded to the low bidder - that's an ITB/IFB
• It only asks for information with no award attached - that's an RFI
• When the acronym is ambiguous (especially 'RFQ'), the evaluation section settles it: read how the owner says the award will be made

What to submit for each

• RFQ: a criteria-first SOQ - relevant projects, key staff, past performance, and locality - with no fee unless asked
• RFP: a full proposal that adds technical approach, schedule, staffing plan, and price, structured to the evaluation factors
• ITB: a complete, responsive sealed bid that meets every bonding, insurance, and responsibility requirement
• RFI: a concise, helpful response that demonstrates capability without over-investing in a non-award document

Common mistakes

• Volunteering price in an RFQ or other qualifications-only process - it can breach the rules under QBS
• Submitting a thin qualifications blurb when the RFP wanted a real technical approach
• Treating an ITB casually - a small responsiveness or bonding error can invalidate the lowest bid
• Assuming 'RFQ' means qualifications when the document is actually a price quotation request
• Ignoring the evaluation section, which always tells you how the award will be made

Why owners choose each method

The method an owner picks reflects what they are most trying to protect. A public agency buying design services uses an RFQ because the quality of the professionals matters more than a fee that is a small share of project cost - and, for federal architecture and engineering work, because the law requires qualifications-based selection. An owner buying complex services where the approach genuinely varies uses an RFP so it can compare methodologies and pay for the best value, not just the cheapest bid. And an owner building to a finished design uses an ITB because the scope is fixed, bids are directly comparable, and price is the fairest way to decide. Reading the method backward tells you what the owner values - and therefore what your response should emphasize.

A worked example across one capital project

Picture a city replacing a water treatment plant. First it issues an RFQ for design services and shortlists engineering firms on qualifications, then negotiates a contract with the most qualified. That firm designs the plant. Some cities then deliver construction through an ITB, awarding to the lowest responsive bidder against the completed plans and specifications. Had the city chosen design-build instead, it would have combined the steps - an RFQ to shortlist design-build teams, followed by an RFP for a best-value technical and price proposal. Same project, different procurement paths, each with a different document to prepare. Knowing which path the owner is on is the difference between submitting the right response and the wrong one.