RFI vs. RFP vs. RFQ: What Contractors Need to Know

Key takeaways

• An RFI (request for information) is the first step in procurement. Buyers use it to gather general information about vendors, clarify their own requirements, and build a shortlist before defining a project in detail.
• An RFP (request for proposal) presents a project or problem and asks vendors to propose a detailed solution, including their approach, timeline, resources, and costs.
• An RFQ (request for quote) asks vendors for detailed pricing on a clearly defined scope. Buyers use it when they already know exactly what they need and want to compare prices.
• The difference between an RFI and an RFP is the level of detail. An RFI asks broad questions to screen vendors, while an RFP asks for a specific, project-focused solution. Many buyers use both: an RFI for initial screening and an RFP to evaluate proposals.
• The difference between an RFQ and an RFP is the focus. An RFQ compares prices for a fixed scope, while an RFP compares how each vendor would solve the problem and what it would cost.
• In construction, an RFI is a formal written request for clarification on drawings, specifications, or contract documents, usually sent by a contractor or subcontractor to the architect or engineer while the project is underway.
• An RFQ itself is not legally binding. A vendor’s quote can become a binding contract once the buyer accepts it or issues a purchase order, depending on the terms.
• Inventory software like inFlow helps contractors respond to RFQs and RFPs with accurate numbers by tracking stock levels, product costs, and cost of goods sold (COGS) in one place.

In a previous article, we broke down the difference between quotes and estimates, essential knowledge for any contractor! Now we’re continuing the trend by comparing RFI vs. RFP vs. RFQ.

The terms request for information (RFI), request for proposal (RFP), and request for quote (RFQ) may sound similar, but the differences between the three are important. And not just for general contractors or field workers, but for their customers, too! Mix them up, and you could end up answering the wrong question, pricing a job nobody asked you to price yet, or missing out on the work entirely.

The stakes are real on both sides of the table. Proposal teams spend an average of 33 hours on every RFP they answer, and they won just 39% of them last year, according to Loopio’s 2026 RFP Response Trends & Benchmarks report. On the construction side, a Navigant Construction Forum study of 1,362 major projects found an average of 796 RFIs per project, each costing roughly $1,080 to review and answer.

So: what is an RFI? What about an RFQ? What’s the difference between RFI vs. RFP? And what is an RFI in construction (because yes, it means something different there)?

There’s a lot of information to go over here, so let’s get right into it!

RFI vs. RFP vs. RFQ at a glance

The main difference between an RFI, RFP, and RFQ is how much the buyer already knows. An RFI gathers information while the buyer is still exploring, an RFP asks for a solution once the problem is defined, and an RFQ asks for a price once the buyer knows exactly what they want.

What is a request for information (RFI)?

A request for information (RFI) is the first step in the vendor selection process, and it’s exactly what it sounds like: a request for information. Yes, really! A buyer sends an RFI to a group of potential vendors or contractors to learn who’s out there, what they can do, and roughly what the work might cost, all before committing to anything.

While it may seem self-explanatory, an RFI is often the first step in establishing a working relationship between a buyer and a vendor, or between a contractor and a customer. It’s also not a commitment. Under U.S. federal procurement rules, for example, RFIs are used when the government isn’t planning to award a contract yet, and responses to an RFI can’t be accepted to form a binding contract.

What to include in an RFI

When a company or individual sends an RFI, they usually include a few things. After a table of contents, the sender will describe the problem they’re attempting to solve or the need they’re trying to fulfill. Afterwards, they’ll detail the buyer’s requirements, a desired timeframe, and so on. A typical RFI covers:

• Background: Who the buyer is and what they do
• The problem or need: What they’re trying to solve, in plain terms
• Known requirements: Any must-haves, constraints, or standards
• Questions for vendors: Capabilities, experience, references, and general pricing
• Response instructions: The deadline, format, and who to contact

It’s best to send a standardized RFI to every company or contractor so you get similar documents back. This makes comparing responses much easier when it comes time to make a selection.

Now, let’s talk about what an RFI means in construction, because it’s a different animal altogether.

What is an RFI in construction?

In construction, an RFI is a formal written request for clarification about drawings, specifications, or contract documents. It’s usually sent by a contractor or subcontractor to the architect or engineer, most often after the job has been awarded and work is underway.

Why the difference? Construction projects take a long time. They also involve quite a few other parties. You’ll need electricians to install powerlines, plumbers to lay pipe, and so on.

Each of these trades uses different schematics and works at completely different times. As a result, there tend to be gaps in the documentation between the parties involved. A contractor sends an RFI to identify these gaps and make sure everyone completes everything correctly.

Outside of this, field workers will also send RFIs when they need clarification from another party. Some drawings or schematics might be unclear or might not match up to what’s actually on site. They could also be outdated or incorrect.

And those questions add up fast. A Navigant Construction Forum review of 1,362 major projects found an average of 796 RFIs per project, with a median response time of 9.7 days and an average cost of $1,080 per RFI. RFIs can also become the paper trail behind delay claims and change orders, which is why a clear, well-documented process matters so much.

How the construction RFI process works

Most construction RFIs follow the same basic path:

1. Someone spots a problem. A drawing conflicts with the specs, a dimension is missing, or a specified material isn’t available.
2. The contractor or subcontractor writes the RFI. Good RFIs ask one question, reference the exact sheet numbers and spec sections, include photos or markups, and suggest a solution.
3. The general contractor reviews and logs it. They check that the answer isn’t already in the contract documents, assign an RFI number, and set a response date.
4. The architect or engineer responds. The response window is usually set in the contract.
5. The answer is shared and filed. If the answer changes the scope, cost, or schedule, that change is handled through a change order, not the RFI itself.

Example of a construction RFI

Here’s what a clear, focused construction RFI might look like:

Notice it asks one question, points to exactly where the conflict is, and proposes an answer. That makes it fast to respond to, and it leaves a clear record if the answer affects cost later.

What is a request for proposal (RFP)?

A request for proposal (RFP) is a document that presents a project or problem and asks vendors to propose a solution. RFPs are often required for larger-scale projects and give clients a chance to gauge whether a contractor can finish the proposed project on time, up to standards, and within budget. Rather than asking for information, an RFP asks for a plan.

Clients will often request RFPs from several companies for a specific project and review the submissions to find the best proposal. Governments and enterprises often send RFPs for long-term projects that require a significant amount of resources. In construction, the RFP usually comes from the project owner, such as a developer, school district, or government agency, inviting general contractors or design-build firms to explain how they’d deliver the project.

An RFP evaluates how well a vendor can complete the project at hand. It should ask for a detailed timeframe, capital and resource costs, and labor costs.

RFPs are big business, too. Across the 1,533 proposal professionals in Loopio’s 2026 report, RFPs influenced 40% of the average company’s revenue, the highest share since the survey began in 2019.

What to include in an RFP

A strong RFP gives every vendor the same information to work from, so the proposals that come back are easy to compare. Most include:

• Project overview and goals: What the project is and what success looks like
• Scope of work: What’s included (and what isn’t)
• Requirements and specifications: Standards, materials, or certifications the work must meet
• Timeline: Key milestones and the expected completion date
• Budget or pricing format: How vendors should break down their costs
• Evaluation criteria: How proposals will be scored, such as price, experience, approach, or safety record
• Submission instructions: The deadline, format, and contact person for questions
• Contract terms: Payment terms, insurance, bonding, and other conditions

What is a request for quote (RFQ)?

A request for quote, or RFQ, asks vendors to name their price for a clearly defined product, service, or scope of work. While RFIs and RFPs will likely contain some financial information, an RFQ calls for a much more detailed breakdown of the estimated cost of a project. It includes a detailed description of exactly what the buyer wants to purchase, so every vendor is quoting on the same thing.

RFQs give clients a clear, line-by-line picture of what a project will cost, and vendors sometimes offer multiple pricing tiers with different options for the customer to choose from. This is typically the last document a vendor receives before a deal is made. Because the buyer already knows what they want, RFQs work best for standardized purchases: a set quantity of materials, an equipment rental, or a clearly defined scope of labor.

One thing to watch for in construction: RFQ can also stand for request for qualifications. Project owners use this document to prequalify contractors based on experience, safety record, bonding capacity, and past projects before inviting them to bid. Always double-check which one you’re looking at!

What to include in an RFQ

The more specific the RFQ, the easier it is to compare quotes apples to apples. A good RFQ lists:

• Items or services: Every product or task, with specs, quantities, and units of measure
• Delivery details: Where and when everything needs to arrive or be completed
• Pricing format: Unit prices, totals, and whether taxes and freight are included
• Payment terms: When and how the vendor will be paid
• Quote validity: How long the price needs to hold
• Deadline and instructions: When quotes are due and how to submit them

Is an RFQ legally binding?

No. An RFQ is just a request, so it doesn’t bind anyone. The quote a vendor sends back usually isn’t a contract on its own either, but it can become part of one once the buyer accepts it, issues a purchase order, or both parties sign. Exactly when that happens depends on the terms of the quote and the contract law where you work.

U.S. federal purchasing is a good example. There, a quotation isn’t considered an offer at all: the government’s order is the offer, and a contract only forms once the supplier accepts it. So, both parties need to read quotes carefully before signing anything! If you’re unsure what you’re agreeing to, it’s worth having a lawyer review the terms.

RFI vs. RFP: What’s the difference?

Generally speaking, the biggest difference between an RFI and an RFP is the level of detail. While an RFI asks for general information, an RFP requests very specific information about the project at hand.

In some instances, companies use both. They’ll send an RFI to determine whether a company or contractor is a good fit, and then send an RFP to the shortlist as part of the selection process.

In construction, the comparison works a little differently. A construction RFI is a question asked during a project to clarify the documents, while an RFP is used before the project to decide who gets to build it.

RFQ vs. RFP: What’s the difference?

The biggest difference between an RFQ and an RFP is what the buyer is evaluating. An RFP asks vendors how they would solve a problem, so buyers weigh the approach, experience, and price together. An RFQ asks vendors what they’d charge for a clearly defined scope, so price, along with delivery and terms, usually decides it.

Here’s a simple way to tell which one fits:

• Use an RFP when the solution could look different from one vendor to the next.
• Use an RFQ when every vendor would be quoting on the exact same thing.

For example, say a property manager wants to lower energy costs in an office building. They’d send an RFP, since one contractor might propose a new HVAC system while another suggests LED retrofits and smarter controls. But if they already know they need 40 specific LED fixtures installed, an RFQ gets them comparable prices much faster.

Of course, the lines can blur. Many RFPs include a detailed pricing section, and some buyers follow an RFP with an RFQ once they’ve settled on an approach. If you’re bidding a fixed-price contract, for instance, you’ll want your pricing nailed down either way.

When to use an RFI, RFP, or RFQ

Use an RFI when you’re still learning what’s possible, an RFP when you know the problem but not the solution, and an RFQ when you know exactly what you need and want the best price. Depending on the circumstances, contractors may deal with all three in order; other times, they’ll skip directly to an RFQ. It depends on the project and how complex it is.

When all three are used, they usually follow this sequence:

1. RFI: The buyer builds a broad pool of potential vendors.
2. RFP: The buyer narrows that pool to the vendors best able to deliver.
3. RFQ: The buyer gets final pricing and makes a selection.

Here’s a quick overview of when someone might use each one:

• RFI: Use an RFI when asking for basic information about a project or vendor. Because RFIs don’t contain specifics, they’re often the first part of the bidding process. Many buyers also use them to make first contact and start building a working relationship.
• RFP: Use an RFP to assess a vendor’s ability to meet the project specifications. RFPs are a helpful way to put costs and decisions into context, since each proposal shows not just what the work costs but how the vendor plans to do it. They also give buyers a documented basis for explaining why one vendor was chosen over another.
• RFQ: Use an RFQ when you have all the information you need and you’re looking for a complete breakdown of what a project will cost and what pricing options are available.

Keep in mind that not every project or buyer will use these documents. For example, a homeowner fixing up their house is far more likely to skip straight to asking for a quote than to send out an RFI. In that case, RFI vs. RFP doesn’t really matter. That being said, most formal RFPs come from large-scale contracts, which means they’re often part of a competitive bidding process.

How to respond to an RFI, RFP, or RFQ as a contractor

The best responses answer exactly what was asked, on time, with numbers you can stand behind. There are a lot of reasons why your responses (and especially your estimates) need to be accurate. An incorrect price or estimate could be the difference between a customer choosing you or not. Your responses also signal your overall competency. The better you know your business, the better and more accurate your responses will be, and that tells buyers whether you’re the right choice for the job.

A few practical habits go a long way:

1. Read the whole document first. Note the deadline, the required format, and how responses will be scored before you write a word. Missed deadlines are a growing reason bids get lost; almost twice as many proposal teams flagged them in Loopio’s 2026 report as the year before.
2. Decide whether it’s worth bidding. Not every opportunity is a good fit. In the same report, 81% of top-performing teams (those winning more than half their RFPs) used a formal go/no-go process to decide what to pursue.
3. Answer the question that was asked. Keep RFI responses short and factual. Tailor RFP responses to the buyer’s stated goals and evaluation criteria. Make RFQ responses line-for-line, matching the buyer’s own item list.
4. Ask your own questions early. If the bid documents are unclear, submit a question before the deadline rather than guessing. Guessing is how margins disappear.
5. Price from current numbers, not memory. Material costs have moved a lot recently. In our State of Inventory Management 2026 survey of 400 operators, 63% saw material and product costs rise over the past year.
6. Only quote what you can deliver. In our survey of 1,000 shoppers who had hit a stockout, 75% of those buying for work said the exact item or spec was required, and 40% had a technician who couldn’t finish the job on the first visit. Check your stock before you promise a timeline.
7. Spell out your assumptions. List exclusions, how long your price is valid, and what happens if material prices change. It protects you when the job runs longer than expected and makes job costing much easier later.

How to give more accurate quotes and estimates

The most accurate quotes come from knowing exactly what you have, what it cost you, and what the job will use. As important as accuracy is, figuring out a quote or estimate on the fly can be really difficult. You need to know what materials you’ve got on hand, how much they cost, and what equipment you’ll need for the job. All those different numbers can make it challenging to figure out a reasonable timeline, much less a quote.

And most contractors are still doing that math by hand. In our survey of 108 construction and trades operators, 86% track inventory in spreadsheets and 81% use no dedicated inventory software at all. Meanwhile, 69% saw material costs climb over the past year, so a price list that was accurate in the spring may not be accurate by fall.

Inventory software built for field service teams, like inFlow, can help anyone working in the trades create more accurate responses to RFIs, RFPs, and RFQs.

Our software enables you to calculate your cost of goods sold (COGS), track inventory levels, and pull several super helpful reports. inFlow also factors freight, duties, and other non-vendor costs into each product’s cost, so the number you quote from reflects what the material actually cost you. It even comes with a built-in barcode system you can use to scan consumable components in and out and track your most valuable assets, so you know where everything is no matter where you are.

When it’s time to send a price, you can build a sales quote from the products you actually stock, email it to your customer, and convert it into a sales order once they say yes. Quotes don’t reduce your inventory until they’re converted, so you can send as many as you need. Going the other direction, you can email your own suppliers a Request for Quote straight from a purchase quote, then convert the winning quote into a purchase order.

FAQ

What does RFQ mean in construction?

In construction, RFQ usually means request for quote: a request for pricing on a clearly defined scope, such as materials or a subcontracted task. It can also mean request for qualifications, a document project owners use to prequalify contractors based on experience, safety record, bonding capacity, and past work before inviting them to bid. Check the title and contents to know which one you’ve received.

What is an RFx?

RFx is an umbrella term for the family of “request for” documents used in procurement. It covers the request for information (RFI), request for proposal (RFP), and request for quote (RFQ), along with related documents like the request for qualifications and the request for tender (RFT). Procurement teams often say “RFx” when a buying process could involve any of them.

Is an RFQ the same as a bid or an invitation to bid?

They’re close, but not the same. An RFQ asks vendors for pricing and is often fairly informal. An invitation to bid (ITB), also called an invitation for bids (IFB), is a formal, often sealed bidding process common in public construction, where the contract typically goes to the lowest qualifying bid. Both focus on price, but an ITB has much stricter rules for submitting and opening bids.

Can you skip the RFI and go straight to an RFP or RFQ?

Yes. An RFI is optional. If a buyer already knows the market and has a shortlist of qualified vendors, they can go straight to an RFP. If they know exactly what they need and only want prices, they can go straight to an RFQ. Smaller jobs, like home repairs or routine material orders, almost always skip straight to a quote.

How long does it take to get a response to a construction RFI?

It depends on the contract, which should set a response window for RFIs before work starts. As a benchmark, the Navigant Construction Forum found a median response time of 9.7 days across 1,362 major projects. Submitting RFIs early, well before the answer is needed on site, gives the architect or engineer time to respond without holding up the schedule.

What are common mistakes to avoid when submitting an RFI?

The most common RFI mistakes are packing several questions into one RFI, leaving out drawing or spec references, asking something already answered in the contract documents, and submitting too late for the answer to arrive before the work. Keep each RFI to one clear question, point to exactly where the issue is, include photos or markups, and suggest a solution.

What software helps contractors prepare accurate quotes?

Inventory management software helps contractors quote accurately because it shows what’s in stock and what each item actually costs. inFlow, for example, tracks stock levels and landed product costs, lets you build and email sales quotes from your product list, and converts accepted quotes into sales orders. You can also send suppliers a Request for Quote to compare pricing before you buy.