Contracts

What is a letter of intent in construction?

A letter of intent (LOI) is a short document saying an owner or general contractor intends to award a contract to a specific contractor, often letting limited work start before the full contract is signed.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

A letter of intent is a promise to make a deal, not the deal itself. An owner sends one to the general contractor it picked, or a GC sends one to a subcontractor, saying "we intend to award you this work, and here are the basic terms." The LOI usually names the project, the scope, a price or pricing method, and a target date for the full contract. Many LOIs also authorize some work right away: ordering long-lead equipment, mobilizing, or starting design.

LOIs exist because schedules move faster than lawyers. The full owner-contractor agreement or subcontract can take weeks to negotiate, and nobody wants to lose a 16-week lead time on switchgear while that happens.

What a good LOI includes

  • Parties and project. Who is issuing it, who is receiving it, and which job.
  • Scope. The work being awarded, ideally by reference to drawings, specs, and the bid.
  • Price. A lump sum, a GMP, or a rate structure.
  • Authorized work. Exactly what you may do before the contract is signed, such as submittals, shop drawings, or purchasing specific items.
  • Spending cap. A not-to-exceed amount for authorized work.
  • Payment if the deal falls through. How you get paid for authorized work if the contract is never signed.
  • Expiration. A date when the LOI ends if no contract follows.
  • Binding or not. A clear statement of which parts are binding.

How it works on a real job

Say a mechanical sub is the low bidder on a $2.1 million package for a school addition. The GC's subcontract form is still being reviewed, but the rooftop units have a long lead time. The GC sends an LOI that awards the work, authorizes the sub to release the RTU order and prepare submittals, and caps authorized spending at $180,000. It says that if the subcontract is not signed within 45 days, the GC will pay for authorized work performed and materials that cannot be cancelled, at cost plus 10 percent.

That is a workable LOI. The sub knows what it can spend, what happens if the deal dies, and when the letter expires. Compare it with a one-line email that says "you're our guy, get started." If the GC later picks someone else, the sub may be stuck arguing over who owns $180,000 of equipment.

Common disputes and mistakes

Most fights over LOIs come from the question of whether the letter was a binding contract. Courts look at the words used, whether key terms were settled, and how the parties acted. A letter that says it is non-binding but also tells you to start work sends mixed signals. Because the answer depends on state law and the exact language, have counsel review any LOI that authorizes real spending.

  1. Starting work beyond what the letter authorizes. Extra work may not be covered.
  2. No not-to-exceed amount, so neither side knows the exposure.
  3. Letting the LOI quietly expire while work continues, with no contract in place.
  4. Assuming the LOI's terms will carry into the final contract. The final subcontract may add pay-if-paid language, liquidated damages, or flow-down clauses you never saw.
  5. Forgetting lien and notice deadlines. In many states the clock starts when you first furnish labor or materials, contract or not.

Related terms

An LOI often comes before a notice to proceed and an award. It is common with long-lead items and precon services. Smart Business Automator carries the bid, the LOI terms, and the authorized budget into the project record so the team starts from the same numbers. See estimate to project handoff automation.

Frequently asked questions

Is a letter of intent legally binding?

It can be, in whole or in part. It depends on the wording, whether the essential terms are agreed, how the parties behave, and state law. Spell out in the letter which parts bind and which do not.

What is the difference between an LOI and a notice to proceed?

An LOI signals intent to award a contract that is not yet signed. A notice to proceed usually comes under a signed contract and starts the contract time.

Should a subcontractor start work on a letter of intent?

Only within the work the letter authorizes, and only when it says how that work gets paid if the subcontract never happens. Get it in writing, not by phone.

How long should an LOI last?

Long enough to finish negotiating the contract, often a few weeks. Include an expiration date and a way to extend it in writing.

Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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