The Difference Between an Estimate, Quote, Bid, and Proposal


In construction, an estimate, bid, quote, and proposal can take on different meanings depending on who is using the term. Some construction professionals use the words “estimate” and “quote” interchangeably, while a bid or proposal may turn into a contract if a customer signs it.

It’s a lot like the difference between Coke, cola, soda, and pop––it all depends on where you are and who you’re talking to, but we can all agree that you won’t get a glass of milk when you order one.

Putting all of the confusion and subtleties aside, below are what we consider the most widely accepted definitions.


A quote is a figure that a contractor gets from a supplier for the price of materials they need for a job.

Quotes are often only good for a certain period of time––generally about a month––which means the builder has only that amount of time to buy the materials at the given price.  Outside the given timeframe, the price of materials may change. This is why there is often a timeframe associated with quotes. Quotes expire because the materials involved in a construction project are commodities and their prices fluctuate based on supply and demand.

A good example is lumber. In an expanding economy, suppliers can’t just create more 2×4’s if demand outstrips their projections. Trees need to be harvested, processed into lumber, and shipped to market before they’re sold. It takes time for producers to catch up to the unanticipated demand. Another example may include an excavator whose costs vary depending on the price of diesel fuel at the time he actually performs the work.


Contractors use estimates to calculate their expected costs to complete a project. They look at the specifications for a project and determine the raw materials and labor they need. The contractor then goes to their suppliers to get quotes for the raw materials, which they use to calculate the estimate.

An estimate may also include an accounting of taxes, overhead, subcontracts, and equipment costs. Contractors generally work up estimates before or during the process of drafting a bid or proposal.

Estimates are usually free, but some contractors do charge for the time it takes to provide a thorough and accurate estimate.

Those who charge for estimates often have a formal education in construction and you can expect a much more detailed document where everything is spelled out. As a client, if you’re receiving multiple estimates, sometimes the more detailed one will help you find items that less detailed estimates may have overlooked.

Check out this useful step-by-step guide for successful electrical estimation by Esticom.


The word “bid” in construction may refer to a document that offers to perform a specific job at a specific price within a certain period of time (also called a proposal). It may also refer to the specific price offered in that document.

Here’s an example of how the term might be used:

Jack: ABC construction submitted their bid today (referring to the document)

Jill: Oh. What did they bid? (referring to the price)

A subcontractor might also submit a bid to a general contractor to perform a certain part of a project. Think of a framer submitting a bid to a general contractor for the framing work on a house. The framer’s bid, if he wins, then figures into the general contractor’s bid to build the entire home.


A proposal is a detailed document submitted as part of a competitive process to win business. It includes quotes received from suppliers for raw materials, proposals from subcontractors for their portion of work on the project, and estimates of labor costs, taxes, and other overhead. It also includes a markup of the contractor’s profit.

For example, the type of siding, brick, or stucco for the exterior of a building, the type of windows, as well as a timeline for the project and a schedule for payments would all be included.

Some proposals also include a place for the customer to sign in order to represent their acceptance of the proposal. Some contractors may also refer to this type of proposal as a “contract.” Others simply ask for a signature to acknowledge receipt of the proposal.

While the difference between a construction estimate, quote, bid, and proposal may be confusing to understand, knowing the difference is crucial to the success of your projects.

Full attribution:  This article was lifted from  and was posted on that site on March 28, 2016 by the 



Fantastic breakdown of the distinctions between estimate, quote, bid, and proposal by Craftsman Engineering! 👏 This blog provides a clear understanding, making it an invaluable resource for anyone navigating project management and contracting. Thanks for simplifying complex concepts and delivering insightful content!

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